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thread: Locking mutexes and rwlocks are now void functions. 

Almost nothing checks these return values, and there's no reason a valid
lock should fail to operate. The cases where a lock isn't valid (it's a
bogus pointer, it was previously destroyed, a thread is unlocking a lock it
doesn't own, etc) are undefined behavior and always were, and should be
treated as an application bug.

Reference Issue #8096.
main
Ryan C. Gordon 2023-10-25 10:00:26 -04:00
parent 082ef41566
commit 899eb0d042
21 changed files with 496 additions and 746 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
docs/README-migration.md
View File

@ -707,6 +707,8 @@ The following functions have been renamed:
## SDL_mutex.h
SDL_LockMutex and SDL_UnlockMutex now return void; if the mutex is valid (including being a NULL pointer, which returns immediately), these functions never fail. If the mutex is invalid or the caller does something illegal, like unlock another thread's mutex, this is considered undefined behavior.
The following functions have been renamed:
* SDL_CondBroadcast() => SDL_BroadcastCondition()
* SDL_CondSignal() => SDL_SignalCondition()

56
include/SDL3/SDL_mutex.h
View File

@ -169,13 +169,15 @@ extern DECLSPEC SDL_Mutex *SDLCALL SDL_CreateMutex(void);
* unlock it the same number of times before it is actually made available for
* other threads in the system (this is known as a "recursive mutex").
*
* This function does not fail; if mutex is NULL, it will return immediately
* having locked nothing. If the mutex is valid, this function will always
* block until it can lock the mutex, and return with it locked.
*
* \param mutex the mutex to lock
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 3.0.0.
*/
extern DECLSPEC int SDLCALL SDL_LockMutex(SDL_Mutex *mutex) SDL_ACQUIRE(mutex);
extern DECLSPEC void SDLCALL SDL_LockMutex(SDL_Mutex *mutex) SDL_ACQUIRE(mutex);
/**
* Try to lock a mutex without blocking.
@ -186,9 +188,13 @@ extern DECLSPEC int SDLCALL SDL_LockMutex(SDL_Mutex *mutex) SDL_ACQUIRE(mutex);
* This technique is useful if you need exclusive access to a resource but
* don't want to wait for it, and will return to it to try again later.
*
* This function does not fail; if mutex is NULL, it will return 0 immediately
* having locked nothing. If the mutex is valid, this function will always
* either lock the mutex and return 0, or return SDL_MUTEX_TIMEOUT and lock
* nothing.
*
* \param mutex the mutex to try to lock
* \returns 0, `SDL_MUTEX_TIMEDOUT`, or -1 on error; call SDL_GetError() for
* more information.
* \returns 0 or `SDL_MUTEX_TIMEDOUT`
*
* \since This function is available since SDL 3.0.0.
*
@ -210,12 +216,10 @@ extern DECLSPEC int SDLCALL SDL_TryLockMutex(SDL_Mutex *mutex) SDL_TRY_ACQUIRE(0
* thread, and doing so results in undefined behavior.
*
* \param mutex the mutex to unlock.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 3.0.0.
*/
extern DECLSPEC int SDLCALL SDL_UnlockMutex(SDL_Mutex *mutex) SDL_RELEASE(mutex);
extern DECLSPEC void SDLCALL SDL_UnlockMutex(SDL_Mutex *mutex) SDL_RELEASE(mutex);
/**
* Destroy a mutex created with SDL_CreateMutex().
@ -321,15 +325,17 @@ extern DECLSPEC SDL_RWLock *SDLCALL SDL_CreateRWLock(void);
* lock before requesting a read-only lock. (But, of course, if you have the
* write lock, you don't need further locks to read in any case.)
*
* This function does not fail; if rwlock is NULL, it will return immediately
* having locked nothing. If the rwlock is valid, this function will always
* block until it can lock the mutex, and return with it locked.
*
* \param rwlock the read/write lock to lock
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 3.0.0.
*
* \sa SDL_UnlockRWLock
*/
extern DECLSPEC int SDLCALL SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_ACQUIRE_SHARED(rwlock);
extern DECLSPEC void SDLCALL SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_ACQUIRE_SHARED(rwlock);
/**
* Lock the read/write lock for _write_ operations.
@ -348,15 +354,17 @@ extern DECLSPEC int SDLCALL SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_ACQ
* read-only lock. Doing so results in undefined behavior. Unlock the
* read-only lock before requesting a write lock.
*
* This function does not fail; if rwlock is NULL, it will return immediately
* having locked nothing. If the rwlock is valid, this function will always
* block until it can lock the mutex, and return with it locked.
*
* \param rwlock the read/write lock to lock
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 3.0.0.
*
* \sa SDL_UnlockRWLock
*/
extern DECLSPEC int SDLCALL SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_ACQUIRE(rwlock);
extern DECLSPEC void SDLCALL SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_ACQUIRE(rwlock);
/**
* Try to lock a read/write lock _for reading_ without blocking.
@ -370,9 +378,13 @@ extern DECLSPEC int SDLCALL SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_ACQ
* Trying to lock for read-only access can succeed if other threads are
* holding read-only locks, as this won't prevent access.
*
* This function does not fail; if rwlock is NULL, it will return 0 immediately
* having locked nothing. If rwlock is valid, this function will always
* either lock the rwlock and return 0, or return SDL_RWLOCK_TIMEOUT and lock
* nothing.
*
* \param rwlock the rwlock to try to lock
* \returns 0, `SDL_RWLOCK_TIMEDOUT`, or -1 on error; call SDL_GetError() for
* more information.
* \returns 0 or `SDL_RWLOCK_TIMEDOUT`
*
* \since This function is available since SDL 3.0.0.
*
@ -400,9 +412,13 @@ extern DECLSPEC int SDLCALL SDL_TryLockRWLockForReading(SDL_RWLock *rwlock) SDL_
* read-only lock. Doing so results in undefined behavior. Unlock the
* read-only lock before requesting a write lock.
*
* This function does not fail; if rwlock is NULL, it will return 0 immediately
* having locked nothing. If rwlock is valid, this function will always
* either lock the rwlock and return 0, or return SDL_RWLOCK_TIMEOUT and lock
* nothing.
*
* \param rwlock the rwlock to try to lock
* \returns 0, `SDL_RWLOCK_TIMEDOUT`, or -1 on error; call SDL_GetError() for
* more information.
* \returns 0 or `SDL_RWLOCK_TIMEDOUT`
*
* \since This function is available since SDL 3.0.0.
*
@ -428,12 +444,10 @@ extern DECLSPEC int SDLCALL SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock) SDL_
* thread, and doing so results in undefined behavior.
*
* \param rwlock the rwlock to unlock.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 3.0.0.
*/
extern DECLSPEC int SDLCALL SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_RELEASE_GENERIC(rwlock);
extern DECLSPEC void SDLCALL SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_RELEASE_GENERIC(rwlock);
/**
* Destroy a read/write lock created with SDL_CreateRWLock().

66
src/SDL_properties.c
View File

@ -123,17 +123,16 @@ SDL_PropertiesID SDL_CreateProperties(void)
goto error;
}
if (SDL_LockRWLockForWriting(SDL_properties_lock) == 0) {
SDL_LockRWLockForWriting(SDL_properties_lock);
++SDL_last_properties_id;
if (SDL_last_properties_id == 0) {
++SDL_last_properties_id;
if (SDL_last_properties_id == 0) {
++SDL_last_properties_id;
}
props = SDL_last_properties_id;
if (SDL_InsertIntoHashTable(SDL_properties, (const void *)(uintptr_t)props, properties)) {
inserted = SDL_TRUE;
}
SDL_UnlockRWLock(SDL_properties_lock);
}
props = SDL_last_properties_id;
if (SDL_InsertIntoHashTable(SDL_properties, (const void *)(uintptr_t)props, properties)) {
inserted = SDL_TRUE;
}
SDL_UnlockRWLock(SDL_properties_lock);
if (inserted) {
/* All done! */
@ -152,15 +151,17 @@ int SDL_LockProperties(SDL_PropertiesID props)
if (!props) {
return SDL_InvalidParamError("props");
}
if (SDL_LockRWLockForReading(SDL_properties_lock) == 0) {
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
}
SDL_LockRWLockForReading(SDL_properties_lock);
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
if (!properties) {
SDL_InvalidParamError("props");
return -1;
return SDL_InvalidParamError("props");
}
return SDL_LockMutex(properties->lock);
SDL_LockMutex(properties->lock);
return 0;
}
void SDL_UnlockProperties(SDL_PropertiesID props)
@ -170,13 +171,15 @@ void SDL_UnlockProperties(SDL_PropertiesID props)
if (!props) {
return;
}
if (SDL_LockRWLockForReading(SDL_properties_lock) == 0) {
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
}
SDL_LockRWLockForReading(SDL_properties_lock);
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
if (!properties) {
return;
}
SDL_UnlockMutex(properties->lock);
}
@ -193,10 +196,10 @@ int SDL_SetProperty(SDL_PropertiesID props, const char *name, void *value, void
return SDL_InvalidParamError("name");
}
if (SDL_LockRWLockForReading(SDL_properties_lock) == 0) {
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
}
SDL_LockRWLockForReading(SDL_properties_lock);
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
if (!properties) {
return SDL_InvalidParamError("props");
}
@ -242,10 +245,10 @@ void *SDL_GetProperty(SDL_PropertiesID props, const char *name)
return NULL;
}
if (SDL_LockRWLockForReading(SDL_properties_lock) == 0) {
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
}
SDL_LockRWLockForReading(SDL_properties_lock);
SDL_FindInHashTable(SDL_properties, (const void *)(uintptr_t)props, (const void **)&properties);
SDL_UnlockRWLock(SDL_properties_lock);
if (!properties) {
SDL_InvalidParamError("props");
return NULL;
@ -280,8 +283,7 @@ void SDL_DestroyProperties(SDL_PropertiesID props)
return;
}
if (SDL_LockRWLockForWriting(SDL_properties_lock) == 0) {
SDL_RemoveFromHashTable(SDL_properties, (const void *)(uintptr_t)props);
SDL_UnlockRWLock(SDL_properties_lock);
}
SDL_LockRWLockForWriting(SDL_properties_lock);
SDL_RemoveFromHashTable(SDL_properties, (const void *)(uintptr_t)props);
SDL_UnlockRWLock(SDL_properties_lock);
}

12
src/audio/SDL_audiocvt.c
View File

@ -476,12 +476,20 @@ int SDL_SetAudioStreamPutCallback(SDL_AudioStream *stream, SDL_AudioStreamCallba
int SDL_LockAudioStream(SDL_AudioStream *stream)
{
return stream ? SDL_LockMutex(stream->lock) : SDL_InvalidParamError("stream");
if (!stream) {
return SDL_InvalidParamError("stream");
}
SDL_LockMutex(stream->lock);
return 0;
}
int SDL_UnlockAudioStream(SDL_AudioStream *stream)
{
return stream ? SDL_UnlockMutex(stream->lock) : SDL_InvalidParamError("stream");
if (!stream) {
return SDL_InvalidParamError("stream");
}
SDL_UnlockMutex(stream->lock);
return 0;
}
int SDL_GetAudioStreamFormat(SDL_AudioStream *stream, SDL_AudioSpec *src_spec, SDL_AudioSpec *dst_spec)

10
src/dynapi/SDL_dynapi_procs.h
View File

@ -519,9 +519,9 @@ SDL_DYNAPI_PROC(void*,SDL_LoadFile_RW,(SDL_RWops *a, size_t *b, SDL_bool c),(a,b
SDL_DYNAPI_PROC(SDL_FunctionPointer,SDL_LoadFunction,(void *a, const char *b),(a,b),return)
SDL_DYNAPI_PROC(void*,SDL_LoadObject,(const char *a),(a),return)
SDL_DYNAPI_PROC(void,SDL_LockJoysticks,(void),(),)
SDL_DYNAPI_PROC(int,SDL_LockMutex,(SDL_Mutex *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_LockRWLockForReading,(SDL_RWLock *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_LockRWLockForWriting,(SDL_RWLock *a),(a),return)
SDL_DYNAPI_PROC(void,SDL_LockMutex,(SDL_Mutex *a),(a),)
SDL_DYNAPI_PROC(void,SDL_LockRWLockForReading,(SDL_RWLock *a),(a),)
SDL_DYNAPI_PROC(void,SDL_LockRWLockForWriting,(SDL_RWLock *a),(a),)
SDL_DYNAPI_PROC(int,SDL_LockSurface,(SDL_Surface *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_LockTexture,(SDL_Texture *a, const SDL_Rect *b, void **c, int *d),(a,b,c,d),return)
SDL_DYNAPI_PROC(int,SDL_LockTextureToSurface,(SDL_Texture *a, const SDL_Rect *b, SDL_Surface **c),(a,b,c),return)
@ -706,8 +706,8 @@ SDL_DYNAPI_PROC(int,SDL_TryLockRWLockForWriting,(SDL_RWLock *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_TryWaitSemaphore,(SDL_Semaphore *a),(a),return)
SDL_DYNAPI_PROC(void,SDL_UnloadObject,(void *a),(a),)
SDL_DYNAPI_PROC(void,SDL_UnlockJoysticks,(void),(),)
SDL_DYNAPI_PROC(int,SDL_UnlockMutex,(SDL_Mutex *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_UnlockRWLock,(SDL_RWLock *a),(a),return)
SDL_DYNAPI_PROC(void,SDL_UnlockMutex,(SDL_Mutex *a),(a),)
SDL_DYNAPI_PROC(void,SDL_UnlockRWLock,(SDL_RWLock *a),(a),)
SDL_DYNAPI_PROC(void,SDL_UnlockSurface,(SDL_Surface *a),(a),)
SDL_DYNAPI_PROC(void,SDL_UnlockTexture,(SDL_Texture *a),(a),)
SDL_DYNAPI_PROC(void,SDL_UpdateGamepads,(void),(),)

147
src/thread/generic/SDL_sysmutex.c
View File

@ -20,7 +20,7 @@
*/
#include "SDL_internal.h"
/* An implementation of mutexes using semaphores */
// An implementation of mutexes using semaphores
#include "SDL_systhread_c.h"
@ -31,13 +31,9 @@ struct SDL_Mutex
SDL_Semaphore *sem;
};
/* Create a mutex */
SDL_Mutex *SDL_CreateMutex(void)
{
SDL_Mutex *mutex;
/* Allocate mutex memory */
mutex = (SDL_Mutex *)SDL_calloc(1, sizeof(*mutex));
SDL_Mutex *mutex = (SDL_Mutex *)SDL_calloc(1, sizeof(*mutex));
#ifndef SDL_THREADS_DISABLED
if (mutex) {
@ -52,12 +48,11 @@ SDL_Mutex *SDL_CreateMutex(void)
} else {
SDL_OutOfMemory();
}
#endif /* !SDL_THREADS_DISABLED */
#endif // !SDL_THREADS_DISABLED
return mutex;
}
/* Free the mutex */
void SDL_DestroyMutex(SDL_Mutex *mutex)
{
if (mutex) {
@ -68,94 +63,72 @@ void SDL_DestroyMutex(SDL_Mutex *mutex)
}
}
/* Lock the mutex */
int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
SDL_threadID this_thread;
if (mutex == NULL) {
return 0;
}
this_thread = SDL_ThreadID();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
SDL_WaitSemaphore(mutex->sem);
mutex->owner = this_thread;
mutex->recursive = 0;
}
return 0;
#endif /* SDL_THREADS_DISABLED */
}
/* try Lock the mutex */
int SDL_TryLockMutex(SDL_Mutex *mutex)
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
int retval = 0;
SDL_threadID this_thread;
if (mutex == NULL) {
return 0;
}
this_thread = SDL_ThreadID();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
retval = SDL_TryWaitSemaphore(mutex->sem);
if (retval == 0) {
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
SDL_threadID this_thread = SDL_ThreadID();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
SDL_WaitSemaphore(mutex->sem);
mutex->owner = this_thread;
mutex->recursive = 0;
}
}
return retval;
#endif /* SDL_THREADS_DISABLED */
}
/* Unlock the mutex */
int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
int SDL_TryLockMutex(SDL_Mutex *mutex)
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
if (mutex == NULL) {
return 0;
int retval = 0;
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
SDL_threadID this_thread = SDL_ThreadID();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
retval = SDL_TryWaitSemaphore(mutex->sem);
if (retval == 0) {
mutex->owner = this_thread;
mutex->recursive = 0;
}
}
}
/* If we don't own the mutex, we can't unlock it */
if (SDL_ThreadID() != mutex->owner) {
return SDL_SetError("mutex not owned by this thread");
}
if (mutex->recursive) {
--mutex->recursive;
} else {
/* The order of operations is important.
First reset the owner so another thread doesn't lock
the mutex and set the ownership before we reset it,
then release the lock semaphore.
*/
mutex->owner = 0;
SDL_PostSemaphore(mutex->sem);
}
return 0;
#endif /* SDL_THREADS_DISABLED */
#endif // SDL_THREADS_DISABLED
return retval;
}
void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
// If we don't own the mutex, we can't unlock it
if (SDL_ThreadID() != mutex->owner) {
SDL_assert(!"Tried to unlock a mutex we don't own!");
return; // (undefined behavior!) SDL_SetError("mutex not owned by this thread");
}
if (mutex->recursive) {
--mutex->recursive;
} else {
/* The order of operations is important.
First reset the owner so another thread doesn't lock
the mutex and set the ownership before we reset it,
then release the lock semaphore.
*/
mutex->owner = 0;
SDL_PostSemaphore(mutex->sem);
}
}
#endif // SDL_THREADS_DISABLED
}

122
src/thread/generic/SDL_sysrwlock.c
View File

@ -20,7 +20,7 @@
*/
#include "SDL_internal.h"
/* An implementation of rwlocks using mutexes, condition variables, and atomics. */
// An implementation of rwlocks using mutexes, condition variables, and atomics.
#include "SDL_systhread_c.h"
@ -30,7 +30,7 @@
* will be chosen at runtime), the function names need to be
* suffixed
*/
/* !!! FIXME: this is quite a tapdance with macros and the build system, maybe we can simplify how we do this. --ryan. */
// !!! FIXME: this is quite a tapdance with macros and the build system, maybe we can simplify how we do this. --ryan.
#ifndef SDL_THREAD_GENERIC_RWLOCK_SUFFIX
#define SDL_CreateRWLock_generic SDL_CreateRWLock
#define SDL_DestroyRWLock_generic SDL_DestroyRWLock
@ -95,63 +95,48 @@ void SDL_DestroyRWLock_generic(SDL_RWLock *rwlock)
}
}
int SDL_LockRWLockForReading_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockRWLockForReading_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifndef SDL_THREADS_DISABLED
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
} else if (SDL_LockMutex(rwlock->lock) == -1) {
return -1;
if (rwlock) {
// !!! FIXME: these don't have to be atomic, we always gate them behind a mutex.
SDL_LockMutex(rwlock->lock);
SDL_assert(SDL_AtomicGet(&rwlock->writer_count) == 0); // shouldn't be able to grab lock if there's a writer!
SDL_AtomicAdd(&rwlock->reader_count, 1);
SDL_UnlockMutex(rwlock->lock); // other readers can attempt to share the lock.
}
SDL_assert(SDL_AtomicGet(&rwlock->writer_count) == 0); /* shouldn't be able to grab lock if there's a writer! */
SDL_AtomicAdd(&rwlock->reader_count, 1);
SDL_UnlockMutex(rwlock->lock); /* other readers can attempt to share the lock. */
#endif
return 0;
}
int SDL_LockRWLockForWriting_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockRWLockForWriting_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifndef SDL_THREADS_DISABLED
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
} else if (SDL_LockMutex(rwlock->lock) == -1) {
return -1;
}
if (rwlock) {
SDL_LockMutex(rwlock->lock);
while (SDL_AtomicGet(&rwlock->reader_count) > 0) { // while something is holding the shared lock, keep waiting.
SDL_WaitCondition(rwlock->condition, rwlock->lock); // release the lock and wait for readers holding the shared lock to release it, regrab the lock.
}
while (SDL_AtomicGet(&rwlock->reader_count) > 0) { /* while something is holding the shared lock, keep waiting. */
SDL_WaitCondition(rwlock->condition, rwlock->lock); /* release the lock and wait for readers holding the shared lock to release it, regrab the lock. */
// we hold the lock!
SDL_AtomicAdd(&rwlock->writer_count, 1); // we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly!
}
/* we hold the lock! */
SDL_AtomicAdd(&rwlock->writer_count, 1); /* we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly! */
#endif
return 0;
}
int SDL_TryLockRWLockForReading_generic(SDL_RWLock *rwlock)
{
#ifndef SDL_THREADS_DISABLED
int rc;
if (rwlock) {
const int rc = SDL_TryLockMutex(rwlock->lock);
if (rc != 0) {
// !!! FIXME: there is a small window where a reader has to lock the mutex, and if we hit that, we will return SDL_RWLOCK_TIMEDOUT even though we could have shared the lock.
return rc;
}
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
SDL_assert(SDL_AtomicGet(&rwlock->writer_count) == 0); // shouldn't be able to grab lock if there's a writer!
SDL_AtomicAdd(&rwlock->reader_count, 1);
SDL_UnlockMutex(rwlock->lock); // other readers can attempt to share the lock.
}
rc = SDL_TryLockMutex(rwlock->lock);
if (rc != 0) {
/* !!! FIXME: there is a small window where a reader has to lock the mutex, and if we hit that, we will return SDL_RWLOCK_TIMEDOUT even though we could have shared the lock. */
return rc;
}
SDL_assert(SDL_AtomicGet(&rwlock->writer_count) == 0); /* shouldn't be able to grab lock if there's a writer! */
SDL_AtomicAdd(&rwlock->reader_count, 1);
SDL_UnlockMutex(rwlock->lock); /* other readers can attempt to share the lock. */
#endif
return 0;
@ -160,46 +145,41 @@ int SDL_TryLockRWLockForReading_generic(SDL_RWLock *rwlock)
int SDL_TryLockRWLockForWriting_generic(SDL_RWLock *rwlock)
{
#ifndef SDL_THREADS_DISABLED
int rc;
if (rwlock) {
const int rc = SDL_TryLockMutex(rwlock->lock);
if (rc != 0) {
return rc;
}
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
} else if ((rc = SDL_TryLockMutex(rwlock->lock)) != 0) {
return rc;
if (SDL_AtomicGet(&rwlock->reader_count) > 0) { // a reader is using the shared lock, treat it as unavailable.
SDL_UnlockMutex(rwlock->lock);
return SDL_RWLOCK_TIMEDOUT;
}
// we hold the lock!
SDL_AtomicAdd(&rwlock->writer_count, 1); // we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly!
}
if (SDL_AtomicGet(&rwlock->reader_count) > 0) { /* a reader is using the shared lock, treat it as unavailable. */
SDL_UnlockMutex(rwlock->lock);
return SDL_RWLOCK_TIMEDOUT;
}
/* we hold the lock! */
SDL_AtomicAdd(&rwlock->writer_count, 1); /* we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly! */
#endif
return 0;
}
int SDL_UnlockRWLock_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockRWLock_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifndef SDL_THREADS_DISABLED
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
if (rwlock) {
SDL_LockMutex(rwlock->lock); // recursive lock for writers, readers grab lock to make sure things are sane.
if (SDL_AtomicGet(&rwlock->reader_count) > 0) { // we're a reader
SDL_AtomicAdd(&rwlock->reader_count, -1);
SDL_BroadcastCondition(rwlock->condition); // alert any pending writers to attempt to try to grab the lock again.
} else if (SDL_AtomicGet(&rwlock->writer_count) > 0) { // we're a writer
SDL_AtomicAdd(&rwlock->writer_count, -1);
SDL_UnlockMutex(rwlock->lock); // recursive unlock.
}
SDL_UnlockMutex(rwlock->lock);
}
SDL_LockMutex(rwlock->lock); /* recursive lock for writers, readers grab lock to make sure things are sane. */
if (SDL_AtomicGet(&rwlock->reader_count) > 0) { /* we're a reader */
SDL_AtomicAdd(&rwlock->reader_count, -1);
SDL_BroadcastCondition(rwlock->condition); /* alert any pending writers to attempt to try to grab the lock again. */
} else if (SDL_AtomicGet(&rwlock->writer_count) > 0) { /* we're a writer */
SDL_AtomicAdd(&rwlock->writer_count, -1);
SDL_UnlockMutex(rwlock->lock); /* recursive unlock. */
}
SDL_UnlockMutex(rwlock->lock);
#endif
return 0;
}

10
src/thread/generic/SDL_sysrwlock_c.h
View File

@ -27,12 +27,12 @@
SDL_RWLock *SDL_CreateRWLock_generic(void);
void SDL_DestroyRWLock_generic(SDL_RWLock *rwlock);
int SDL_LockRWLockForReading_generic(SDL_RWLock *rwlock);
int SDL_LockRWLockForWriting_generic(SDL_RWLock *rwlock);
void SDL_LockRWLockForReading_generic(SDL_RWLock *rwlock);
void SDL_LockRWLockForWriting_generic(SDL_RWLock *rwlock);
int SDL_TryLockRWLockForReading_generic(SDL_RWLock *rwlock);
int SDL_TryLockRWLockForWriting_generic(SDL_RWLock *rwlock);
int SDL_UnlockRWLock_generic(SDL_RWLock *rwlock);
void SDL_UnlockRWLock_generic(SDL_RWLock *rwlock);
#endif /* SDL_THREAD_GENERIC_RWLOCK_SUFFIX */
#endif // SDL_THREAD_GENERIC_RWLOCK_SUFFIX
#endif /* SDL_sysrwlock_c_h_ */
#endif // SDL_sysrwlock_c_h_

40
src/thread/n3ds/SDL_sysmutex.c
View File

@ -22,17 +22,13 @@
#ifdef SDL_THREAD_N3DS
/* An implementation of mutexes using libctru's RecursiveLock */
// An implementation of mutexes using libctru's RecursiveLock
#include "SDL_sysmutex_c.h"
/* Create a mutex */
SDL_Mutex *SDL_CreateMutex(void)
{
SDL_Mutex *mutex;
/* Allocate mutex memory */
mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
SDL_Mutex *mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
if (mutex) {
RecursiveLock_Init(&mutex->lock);
} else {
@ -41,7 +37,6 @@ SDL_Mutex *SDL_CreateMutex(void)
return mutex;
}
/* Free the mutex */
void SDL_DestroyMutex(SDL_Mutex *mutex)
{
if (mutex) {
@ -49,38 +44,23 @@ void SDL_DestroyMutex(SDL_Mutex *mutex)
}
}
/* Lock the mutex */
int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (mutex == NULL) {
return 0;
if (mutex != NULL) {
RecursiveLock_Lock(&mutex->lock);
}
RecursiveLock_Lock(&mutex->lock);
return 0;
}
/* try Lock the mutex */
int SDL_TryLockMutex(SDL_Mutex *mutex)
{
if (mutex == NULL) {
return 0;
}
return RecursiveLock_TryLock(&mutex->lock);
return (mutex == NULL) ? 0 : RecursiveLock_TryLock(&mutex->lock);
}
/* Unlock the mutex */
int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (mutex == NULL) {
return 0;
if (mutex != NULL) {
RecursiveLock_Unlock(&mutex->lock);
}
RecursiveLock_Unlock(&mutex->lock);
return 0;
}
#endif /* SDL_THREAD_N3DS */
#endif // SDL_THREAD_N3DS

28
src/thread/ngage/SDL_sysmutex.cpp
View File

@ -67,17 +67,13 @@ void SDL_DestroyMutex(SDL_Mutex *mutex)
}
/* Lock the mutex */
int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
{
if (mutex == NULL) {
return 0;
if (mutex != NULL) {
RMutex rmutex;
rmutex.SetHandle(mutex->handle);
rmutex.Wait();
}
RMutex rmutex;
rmutex.SetHandle(mutex->handle);
rmutex.Wait();
return 0;
}
/* Try to lock the mutex */
@ -95,16 +91,12 @@ int SDL_TryLockMutex(SDL_Mutex *mutex)
#endif
/* Unlock the mutex */
int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
{
if (mutex == NULL) {
return 0;
if (mutex != NULL) {
RMutex rmutex;
rmutex.SetHandle(mutex->handle);
rmutex.Signal();
}
RMutex rmutex;
rmutex.SetHandle(mutex->handle);
rmutex.Signal();
return 0;
}

101
src/thread/psp/SDL_sysmutex.c
View File

@ -22,7 +22,7 @@
#ifdef SDL_THREAD_PSP
/* An implementation of mutexes using semaphores */
// An implementation of mutexes using semaphores
#include "SDL_systhread_c.h"
@ -36,17 +36,11 @@ struct SDL_Mutex
SceLwMutexWorkarea lock;
};
/* Create a mutex */
SDL_Mutex *SDL_CreateMutex(void)
{
SDL_Mutex *mutex = NULL;
SceInt32 res = 0;
/* Allocate mutex memory */
mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
SDL_Mutex *mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
if (mutex) {
res = sceKernelCreateLwMutex(
const SceInt32 res = sceKernelCreateLwMutex(
&mutex->lock,
"SDL mutex",
SCE_KERNEL_MUTEX_ATTR_RECURSIVE,
@ -54,6 +48,8 @@ SDL_Mutex *SDL_CreateMutex(void)
NULL);
if (res < 0) {
SDL_free(mutex);
mutex = NULL;
SDL_SetError("Error trying to create mutex: %lx", res);
}
} else {
@ -62,7 +58,6 @@ SDL_Mutex *SDL_CreateMutex(void)
return mutex;
}
/* Free the mutex */
void SDL_DestroyMutex(SDL_Mutex *mutex)
{
if (mutex) {
@ -71,75 +66,43 @@ void SDL_DestroyMutex(SDL_Mutex *mutex)
}
}
/* Lock the mutex */
int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
SceInt32 res = 0;
if (mutex == NULL) {
return 0;
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
const SceInt32 res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
SDL_assert(res == SCE_KERNEL_ERROR_OK); // assume we're in a lot of trouble if this assert fails.
}
res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
if (res != SCE_KERNEL_ERROR_OK) {
return SDL_SetError("Error trying to lock mutex: %lx", res);
}
return 0;
#endif /* SDL_THREADS_DISABLED */
#endif // SDL_THREADS_DISABLED
}
/* Try to lock the mutex */
int SDL_TryLockMutex(SDL_Mutex *mutex)
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
SceInt32 res = 0;
if (mutex == NULL) {
return 0;
int retval = 0;
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
const SceInt32 res = sceKernelTryLockLwMutex(&mutex->lock, 1);
if (res == SCE_KERNEL_ERROR_OK) {
retval = 0;
} else if (res == SCE_KERNEL_ERROR_WAIT_TIMEOUT) {
retval = SDL_MUTEX_TIMEDOUT;
} else {
SDL_assert(!"Error trying to lock mutex"); // assume we're in a lot of trouble if this assert fails.
retval = SDL_MUTEX_TIMEDOUT;
}
}
res = sceKernelTryLockLwMutex(&mutex->lock, 1);
switch (res) {
case SCE_KERNEL_ERROR_OK:
return 0;
break;
case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
return SDL_MUTEX_TIMEDOUT;
break;
default:
return SDL_SetError("Error trying to lock mutex: %lx", res);
break;
}
return -1;
#endif /* SDL_THREADS_DISABLED */
#endif // SDL_THREADS_DISABLED
return retval;
}
/* Unlock the mutex */
int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
SceInt32 res = 0;
if (mutex == NULL) {
return 0;
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
const SceInt32 res = sceKernelUnlockLwMutex(&mutex->lock, 1);
SDL_assert(res == 0); // assume we're in a lot of trouble if this assert fails.
}
res = sceKernelUnlockLwMutex(&mutex->lock, 1);
if (res != 0) {
return SDL_SetError("Error trying to unlock mutex: %lx", res);
}
return 0;
#endif /* SDL_THREADS_DISABLED */
#endif // SDL_THREADS_DISABLED
}
#endif /* SDL_THREAD_PSP */
#endif // SDL_THREAD_PSP

150
src/thread/pthread/SDL_sysmutex.c
View File

@ -30,7 +30,7 @@ SDL_Mutex *SDL_CreateMutex(void)
SDL_Mutex *mutex;
pthread_mutexattr_t attr;
/* Allocate the structure */
// Allocate the structure
mutex = (SDL_Mutex *)SDL_calloc(1, sizeof(*mutex));
if (mutex) {
pthread_mutexattr_init(&attr);
@ -39,7 +39,7 @@ SDL_Mutex *SDL_CreateMutex(void)
#elif defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP)
pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
#else
/* No extra attributes necessary */
// No extra attributes necessary
#endif
if (pthread_mutex_init(&mutex->id, &attr) != 0) {
SDL_SetError("pthread_mutex_init() failed");
@ -60,116 +60,96 @@ void SDL_DestroyMutex(SDL_Mutex *mutex)
}
}
/* Lock the mutex */
int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (mutex != NULL) {
#ifdef FAKE_RECURSIVE_MUTEX
pthread_t this_thread;
#endif
if (mutex == NULL) {
return 0;
}
#ifdef FAKE_RECURSIVE_MUTEX
this_thread = pthread_self();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
if (pthread_mutex_lock(&mutex->id) == 0) {
pthread_t this_thread = pthread_self();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
const int rc = pthread_mutex_lock(&mutex->id);
SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails.
mutex->owner = this_thread;
mutex->recursive = 0;
} else {
return SDL_SetError("pthread_mutex_lock() failed");
}
}
#else
if (pthread_mutex_lock(&mutex->id) != 0) {
return SDL_SetError("pthread_mutex_lock() failed");
}
const int rc = pthread_mutex_lock(&mutex->id);
SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails.
#endif
return 0;
}
}
int SDL_TryLockMutex(SDL_Mutex *mutex)
{
int retval;
int result;
#ifdef FAKE_RECURSIVE_MUTEX
pthread_t this_thread;
#endif
int retval = 0;
if (mutex == NULL) {
return 0;
}
retval = 0;
if (mutex != NULL) {
#ifdef FAKE_RECURSIVE_MUTEX
this_thread = pthread_self();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
result = pthread_mutex_trylock(&mutex->id);
if (result == 0) {
mutex->owner = this_thread;
mutex->recursive = 0;
} else if (result == EBUSY) {
retval = SDL_MUTEX_TIMEDOUT;
pthread_t this_thread = pthread_self();
if (mutex->owner == this_thread) {
++mutex->recursive;
} else {
retval = SDL_SetError("pthread_mutex_trylock() failed");
/* The order of operations is important.
We set the locking thread id after we obtain the lock
so unlocks from other threads will fail.
*/
const int result = pthread_mutex_trylock(&mutex->id);
if (result == 0) {
mutex->owner = this_thread;
mutex->recursive = 0;
} else if (result == EBUSY) {
retval = SDL_MUTEX_TIMEDOUT;
} else {
SDL_assert(!"Error trying to lock mutex"); // assume we're in a lot of trouble if this assert fails.
retval = SDL_MUTEX_TIMEDOUT;
}
}
}
#else
result = pthread_mutex_trylock(&mutex->id);
if (result != 0) {
if (result == EBUSY) {
retval = SDL_MUTEX_TIMEDOUT;
} else {
retval = SDL_SetError("pthread_mutex_trylock() failed");
const int result = pthread_mutex_trylock(&mutex->id);
if (result != 0) {
if (result == EBUSY) {
retval = SDL_MUTEX_TIMEDOUT;
} else {
SDL_assert(!"Error trying to lock mutex"); // assume we're in a lot of trouble if this assert fails.
retval = SDL_MUTEX_TIMEDOUT;
}
}
}
#endif
}
return retval;
}
int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (mutex == NULL) {
return 0;
}
if (mutex != NULL) {
#ifdef FAKE_RECURSIVE_MUTEX
/* We can only unlock the mutex if we own it */
if (pthread_self() == mutex->owner) {
if (mutex->recursive) {
--mutex->recursive;
// We can only unlock the mutex if we own it
if (pthread_self() == mutex->owner) {
if (mutex->recursive) {
--mutex->recursive;
} else {
/* The order of operations is important.
First reset the owner so another thread doesn't lock
the mutex and set the ownership before we reset it,
then release the lock semaphore.
*/
mutex->owner = 0;
pthread_mutex_unlock(&mutex->id);
}
} else {
/* The order of operations is important.
First reset the owner so another thread doesn't lock
the mutex and set the ownership before we reset it,
then release the lock semaphore.
*/
mutex->owner = 0;
pthread_mutex_unlock(&mutex->id);
return SDL_SetError("mutex not owned by this thread");
}
} else {
return SDL_SetError("mutex not owned by this thread");
}
#else
if (pthread_mutex_unlock(&mutex->id) != 0) {
return SDL_SetError("pthread_mutex_unlock() failed");
const int rc = pthread_mutex_unlock(&mutex->id);
SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails.
#endif // FAKE_RECURSIVE_MUTEX
}
#endif /* FAKE_RECURSIVE_MUTEX */
return 0;
}

53
src/thread/pthread/SDL_sysrwlock.c
View File

@ -55,42 +55,36 @@ void SDL_DestroyRWLock(SDL_RWLock *rwlock)
}
}
int SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (rwlock == NULL) {
return SDL_InvalidParamError("rwlock");
} else if (pthread_rwlock_rdlock(&rwlock->id) != 0) {
return SDL_SetError("pthread_rwlock_rdlock() failed");
if (rwlock) {
const int rc = pthread_rwlock_rdlock(&rwlock->id);
SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails.
}
return 0;
}
int SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (rwlock == NULL) {
return SDL_InvalidParamError("rwlock");
} else if (pthread_rwlock_wrlock(&rwlock->id) != 0) {
return SDL_SetError("pthread_rwlock_wrlock() failed");
if (rwlock) {
const int rc = pthread_rwlock_wrlock(&rwlock->id);
SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails.
}
return 0;
}
int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
{
int retval = 0;
if (rwlock == NULL) {
retval = SDL_InvalidParamError("rwlock");
} else {
if (rwlock) {
const int result = pthread_rwlock_tryrdlock(&rwlock->id);
if (result != 0) {
if (result == EBUSY) {
retval = SDL_RWLOCK_TIMEDOUT;
} else {
retval = SDL_SetError("pthread_rwlock_tryrdlock() failed");
retval = SDL_RWLOCK_TIMEDOUT;
if (result != EBUSY) {
SDL_assert(!"Error trying to lock rwlock for reading"); // assume we're in a lot of trouble if this assert fails.
}
}
}
return retval;
}
@ -98,15 +92,12 @@ int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
{
int retval = 0;
if (rwlock == NULL) {
retval = SDL_InvalidParamError("rwlock");
} else {
if (rwlock) {
const int result = pthread_rwlock_trywrlock(&rwlock->id);
if (result != 0) {
if (result == EBUSY) {
retval = SDL_RWLOCK_TIMEDOUT;
} else {
retval = SDL_SetError("pthread_rwlock_tryrdlock() failed");
retval = SDL_RWLOCK_TIMEDOUT;
if (result != EBUSY) {
SDL_assert(!"Error trying to lock rwlock for writing"); // assume we're in a lot of trouble if this assert fails.
}
}
}
@ -114,13 +105,11 @@ int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
return retval;
}
int SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (rwlock == NULL) {
return SDL_InvalidParamError("rwlock");
} else if (pthread_rwlock_unlock(&rwlock->id) != 0) {
return SDL_SetError("pthread_rwlock_unlock() failed");
if (rwlock) {
const int rc = pthread_rwlock_unlock(&rwlock->id);
SDL_assert(rc == 0); // assume we're in a lot of trouble if this assert fails.
}
return 0;
}

59
src/thread/stdcpp/SDL_sysmutex.cpp
View File

@ -27,74 +27,51 @@ extern "C" {
#include <system_error>
#include "SDL_sysmutex_c.h"
#include <Windows.h>
#include <windows.h>
/* Create a mutex */
extern "C" SDL_Mutex *
SDL_CreateMutex(void)
extern "C" SDL_Mutex * SDL_CreateMutex(void)
{
/* Allocate and initialize the mutex */
// Allocate and initialize the mutex
try {
SDL_Mutex *mutex = new SDL_Mutex;
return mutex;
} catch (std::system_error &ex) {
SDL_SetError("unable to create a C++ mutex: code=%d; %s", ex.code(), ex.what());
return NULL;
} catch (std::bad_alloc &) {
SDL_OutOfMemory();
return NULL;
}
return NULL;
}
/* Free the mutex */
extern "C" void
SDL_DestroyMutex(SDL_Mutex *mutex)
extern "C" void SDL_DestroyMutex(SDL_Mutex *mutex)
{
if (mutex != NULL) {
delete mutex;
}
}
/* Lock the mutex */
extern "C" int
SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
extern "C" void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (mutex == NULL) {
return 0;
}
try {
mutex->cpp_mutex.lock();
return 0;
} catch (std::system_error &ex) {
return SDL_SetError("unable to lock a C++ mutex: code=%d; %s", ex.code(), ex.what());
if (mutex != NULL) {
try {
mutex->cpp_mutex.lock();
} catch (std::system_error &ex) {
SDL_assert(!"Error trying to lock mutex"); // assume we're in a lot of trouble if this assert fails.
//return SDL_SetError("unable to lock a C++ mutex: code=%d; %s", ex.code(), ex.what());
}
}
}
/* TryLock the mutex */
int SDL_TryLockMutex(SDL_Mutex *mutex)
extern "C" int SDL_TryLockMutex(SDL_Mutex *mutex)
{
int retval = 0;
if (mutex == NULL) {
return 0;
}
if (mutex->cpp_mutex.try_lock() == false) {
retval = SDL_MUTEX_TIMEDOUT;
}
return retval;
return ((mutex == NULL) || mutex->cpp_mutex.try_lock()) ? 0 : SDL_MUTEX_TIMEDOUT;
}
/* Unlock the mutex */
extern "C" int
SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
extern "C" void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (mutex == NULL) {
return 0;
if (mutex != NULL) {
mutex->cpp_mutex.unlock();
}
mutex->cpp_mutex.unlock();
return 0;
}

90
src/thread/stdcpp/SDL_sysrwlock.cpp
View File

@ -30,10 +30,8 @@ struct SDL_RWLock
SDL_threadID write_owner;
};
/* Create a rwlock */
extern "C" SDL_RWLock *SDL_CreateRWLock(void)
{
/* Allocate and initialize the rwlock */
try {
SDL_RWLock *rwlock = new SDL_RWLock;
return rwlock;
@ -46,7 +44,6 @@ extern "C" SDL_RWLock *SDL_CreateRWLock(void)
}
}
/* Free the rwlock */
extern "C" void SDL_DestroyRWLock(SDL_RWLock *rwlock)
{
if (rwlock != NULL) {
@ -54,77 +51,64 @@ extern "C" void SDL_DestroyRWLock(SDL_RWLock *rwlock)
}
}
/* Lock the rwlock */
extern "C" int SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
extern "C" void SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
}
try {
rwlock->cpp_mutex.lock_shared();
return 0;
} catch (std::system_error &ex) {
return SDL_SetError("unable to lock a C++ rwlock: code=%d; %s", ex.code(), ex.what());
if (rwlock) {
try {
rwlock->cpp_mutex.lock_shared();
} catch (std::system_error &ex) {
SDL_assert(!"Error trying to lock rwlock for reading"); // assume we're in a lot of trouble if this assert fails.
//return SDL_SetError("unable to lock a C++ rwlock: code=%d; %s", ex.code(), ex.what());
}
}
}
/* Lock the rwlock for writing */
extern "C" int SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
extern "C" void SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
}
try {
rwlock->cpp_mutex.lock();
rwlock->write_owner = SDL_ThreadID();
return 0;
} catch (std::system_error &ex) {
return SDL_SetError("unable to lock a C++ rwlock: code=%d; %s", ex.code(), ex.what());
if (rwlock) {
try {
rwlock->cpp_mutex.lock();
rwlock->write_owner = SDL_ThreadID();
} catch (std::system_error &ex) {
SDL_assert(!"Error trying to lock rwlock for writing"); // assume we're in a lot of trouble if this assert fails.
//return SDL_SetError("unable to lock a C++ rwlock: code=%d; %s", ex.code(), ex.what());
}
}
}
/* TryLock the rwlock for reading */
int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
extern "C" int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
{
int retval = 0;
if (!rwlock) {
retval = SDL_InvalidParamError("rwlock");
} else if (rwlock->cpp_mutex.try_lock_shared() == false) {
retval = SDL_RWLOCK_TIMEDOUT;
if (rwlock) {
if (rwlock->cpp_mutex.try_lock_shared() == false) {
retval = SDL_RWLOCK_TIMEDOUT;
}
}
return retval;
}
/* TryLock the rwlock for writing */
int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
extern "C" int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
{
int retval = 0;
if (!rwlock) {
retval = SDL_InvalidParamError("rwlock");
} else if (rwlock->cpp_mutex.try_lock() == false) {
retval = SDL_RWLOCK_TIMEDOUT;
} else {
rwlock->write_owner = SDL_ThreadID();
if (rwlock) {
if (rwlock->cpp_mutex.try_lock() == false) {
retval = SDL_RWLOCK_TIMEDOUT;
} else {
rwlock->write_owner = SDL_ThreadID();
}
}
return retval;
}
/* Unlock the rwlock */
extern "C" int
SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
extern "C" void SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (!rwlock) {
return SDL_InvalidParamError("rwlock");
} else if (rwlock->write_owner == SDL_ThreadID()) {
rwlock->write_owner = 0;
rwlock->cpp_mutex.unlock();
} else {
rwlock->cpp_mutex.unlock_shared();
if (rwlock) {
if (rwlock->write_owner == SDL_ThreadID()) {
rwlock->write_owner = 0;
rwlock->cpp_mutex.unlock();
} else {
rwlock->cpp_mutex.unlock_shared();
}
}
return 0;
}

89
src/thread/vita/SDL_sysmutex.c
View File

@ -32,24 +32,20 @@ struct SDL_Mutex
SceKernelLwMutexWork lock;
};
/* Create a mutex */
SDL_Mutex *SDL_CreateMutex(void)
{
SDL_Mutex *mutex = NULL;
SceInt32 res = 0;
/* Allocate mutex memory */
mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
SDL_Mutex *mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
if (mutex != NULL) {
res = sceKernelCreateLwMutex(
&mutex->lock,
"SDL mutex",
SCE_KERNEL_MUTEX_ATTR_RECURSIVE,
0,
NULL);
const SceInt32 res = sceKernelCreateLwMutex(
&mutex->lock,
"SDL mutex",
SCE_KERNEL_MUTEX_ATTR_RECURSIVE,
0,
NULL);
if (res < 0) {
SDL_free(mutex);
mutex = NULL;
SDL_SetError("Error trying to create mutex: %x", res);
}
} else {
@ -58,7 +54,6 @@ SDL_Mutex *SDL_CreateMutex(void)
return mutex;
}
/* Free the mutex */
void SDL_DestroyMutex(SDL_Mutex *mutex)
{
if (mutex != NULL) {
@ -67,28 +62,16 @@ void SDL_DestroyMutex(SDL_Mutex *mutex)
}
}
/* Lock the mutex */
int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
SceInt32 res = 0;
if (mutex == NULL) {
return 0;
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
const SceInt32 res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
SDL_assert(res == SCE_KERNEL_OK); // assume we're in a lot of trouble if this assert fails.
}
res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
if (res != SCE_KERNEL_OK) {
return SDL_SetError("Error trying to lock mutex: %x", res);
}
return 0;
#endif /* SDL_THREADS_DISABLED */
#endif // SDL_THREADS_DISABLED
}
/* Try to lock the mutex */
int SDL_TryLockMutex(SDL_Mutex *mutex)
{
#ifdef SDL_THREADS_DISABLED
@ -102,40 +85,24 @@ int SDL_TryLockMutex(SDL_Mutex *mutex)
res = sceKernelTryLockLwMutex(&mutex->lock, 1);
switch (res) {
case SCE_KERNEL_OK:
return 0;
break;
case SCE_KERNEL_ERROR_MUTEX_FAILED_TO_OWN:
return SDL_MUTEX_TIMEDOUT;
break;
default:
return SDL_SetError("Error trying to lock mutex: %x", res);
break;
case SCE_KERNEL_OK: return 0;
case SCE_KERNEL_ERROR_MUTEX_FAILED_TO_OWN: return SDL_MUTEX_TIMEDOUT;
default: break;
}
return -1;
#endif /* SDL_THREADS_DISABLED */
SDL_assert(!"Error trying to lock mutex"); // assume we're in a lot of trouble if this assert fails.
return SDL_MUTEX_TIMEDOUT;
#endif // SDL_THREADS_DISABLED
}
/* Unlock the mutex */
int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
#ifdef SDL_THREADS_DISABLED
return 0;
#else
SceInt32 res = 0;
if (mutex == NULL) {
return 0;
#ifndef SDL_THREADS_DISABLED
if (mutex != NULL) {
const SceInt32 res = sceKernelUnlockLwMutex(&mutex->lock, 1);
SDL_assert(res == SCE_KERNEL_OK); // assume we're in a lot of trouble if this assert fails.
}
res = sceKernelUnlockLwMutex(&mutex->lock, 1);
if (res != 0) {
return SDL_SetError("Error trying to unlock mutex: %x", res);
}
return 0;
#endif /* SDL_THREADS_DISABLED */
#endif // SDL_THREADS_DISABLED
}
#endif /* SDL_THREAD_VITA */
#endif // SDL_THREAD_VITA

81
src/thread/windows/SDL_sysmutex.c
View File

@ -76,12 +76,11 @@ static void SDL_DestroyMutex_srw(SDL_Mutex *mutex)
SDL_free(mutex);
}
static int SDL_LockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
static void SDL_LockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex;
DWORD this_thread;
const DWORD this_thread = GetCurrentThreadId();
this_thread = GetCurrentThreadId();
if (mutex->owner == this_thread) {
++mutex->count;
} else {
@ -94,16 +93,14 @@ static int SDL_LockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /*
mutex->owner = this_thread;
mutex->count = 1;
}
return 0;
}
static int SDL_TryLockMutex_srw(SDL_Mutex *_mutex)
{
SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex;
DWORD this_thread;
const DWORD this_thread = GetCurrentThreadId();
int retval = 0;
this_thread = GetCurrentThreadId();
if (mutex->owner == this_thread) {
++mutex->count;
} else {
@ -118,7 +115,7 @@ static int SDL_TryLockMutex_srw(SDL_Mutex *_mutex)
return retval;
}
static int SDL_UnlockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
static void SDL_UnlockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex;
@ -128,10 +125,8 @@ static int SDL_UnlockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS
pReleaseSRWLockExclusive(&mutex->srw);
}
} else {
return SDL_SetError("mutex not owned by this thread");
SDL_assert(!"mutex not owned by this thread"); // undefined behavior...!
}
return 0;
}
static const SDL_mutex_impl_t SDL_mutex_impl_srw = {
@ -147,16 +142,12 @@ static const SDL_mutex_impl_t SDL_mutex_impl_srw = {
* Fallback Mutex implementation using Critical Sections (before Win 7)
*/
/* Create a mutex */
static SDL_Mutex *SDL_CreateMutex_cs(void)
{
SDL_mutex_cs *mutex;
/* Allocate mutex memory */
mutex = (SDL_mutex_cs *)SDL_malloc(sizeof(*mutex));
SDL_mutex_cs *mutex = (SDL_mutex_cs *)SDL_malloc(sizeof(*mutex));
if (mutex != NULL) {
/* Initialize */
/* On SMP systems, a non-zero spin count generally helps performance */
// Initialize
// On SMP systems, a non-zero spin count generally helps performance
#ifdef __WINRT__
InitializeCriticalSectionEx(&mutex->cs, 2000, 0);
#else
@ -168,43 +159,29 @@ static SDL_Mutex *SDL_CreateMutex_cs(void)
return (SDL_Mutex *)mutex;
}
/* Free the mutex */
static void SDL_DestroyMutex_cs(SDL_Mutex *mutex_)
{
SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
DeleteCriticalSection(&mutex->cs);
SDL_free(mutex);
}
/* Lock the mutex */
static int SDL_LockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
static void SDL_LockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
EnterCriticalSection(&mutex->cs);
return 0;
}
/* TryLock the mutex */
static int SDL_TryLockMutex_cs(SDL_Mutex *mutex_)
{
SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
int retval = 0;
if (TryEnterCriticalSection(&mutex->cs) == 0) {
retval = SDL_MUTEX_TIMEDOUT;
}
return retval;
return (TryEnterCriticalSection(&mutex->cs) == 0) ? SDL_MUTEX_TIMEDOUT : 0;
}
/* Unlock the mutex */
static int SDL_UnlockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
static void SDL_UnlockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
LeaveCriticalSection(&mutex->cs);
return 0;
}
static const SDL_mutex_impl_t SDL_mutex_impl_cs = {
@ -223,22 +200,22 @@ static const SDL_mutex_impl_t SDL_mutex_impl_cs = {
SDL_Mutex *SDL_CreateMutex(void)
{
if (SDL_mutex_impl_active.Create == NULL) {
/* Default to fallback implementation */
// Default to fallback implementation
const SDL_mutex_impl_t *impl = &SDL_mutex_impl_cs;
if (!SDL_GetHintBoolean(SDL_HINT_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS, SDL_FALSE)) {
#ifdef __WINRT__
/* Link statically on this platform */
// Link statically on this platform
impl = &SDL_mutex_impl_srw;
#else
/* Try faster implementation for Windows 7 and newer */
// Try faster implementation for Windows 7 and newer
HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
if (kernel32) {
/* Requires Vista: */
// Requires Vista:
pInitializeSRWLock = (pfnInitializeSRWLock)GetProcAddress(kernel32, "InitializeSRWLock");
pReleaseSRWLockExclusive = (pfnReleaseSRWLockExclusive)GetProcAddress(kernel32, "ReleaseSRWLockExclusive");
pAcquireSRWLockExclusive = (pfnAcquireSRWLockExclusive)GetProcAddress(kernel32, "AcquireSRWLockExclusive");
/* Requires 7: */
// Requires 7:
pTryAcquireSRWLockExclusive = (pfnTryAcquireSRWLockExclusive)GetProcAddress(kernel32, "TryAcquireSRWLockExclusive");
if (pInitializeSRWLock && pReleaseSRWLockExclusive && pAcquireSRWLockExclusive && pTryAcquireSRWLockExclusive) {
impl = &SDL_mutex_impl_srw;
@ -247,7 +224,7 @@ SDL_Mutex *SDL_CreateMutex(void)
#endif
}
/* Copy instead of using pointer to save one level of indirection */
// Copy instead of using pointer to save one level of indirection
SDL_copyp(&SDL_mutex_impl_active, impl);
}
return SDL_mutex_impl_active.Create();
@ -260,31 +237,23 @@ void SDL_DestroyMutex(SDL_Mutex *mutex)
}
}
int SDL_LockMutex(SDL_Mutex *mutex)
void SDL_LockMutex(SDL_Mutex *mutex)
{
if (mutex == NULL) {
return 0;
if (mutex != NULL) {
SDL_mutex_impl_active.Lock(mutex);
}
return SDL_mutex_impl_active.Lock(mutex);
}
int SDL_TryLockMutex(SDL_Mutex *mutex)
{
if (mutex == NULL) {
return 0;
}
return SDL_mutex_impl_active.TryLock(mutex);
return mutex ? SDL_mutex_impl_active.TryLock(mutex) : 0;
}
int SDL_UnlockMutex(SDL_Mutex *mutex)
void SDL_UnlockMutex(SDL_Mutex *mutex)
{
if (mutex == NULL) {
return 0;
if (mutex != NULL) {
SDL_mutex_impl_active.Unlock(mutex);
}
return SDL_mutex_impl_active.Unlock(mutex);
}
#endif /* SDL_THREAD_WINDOWS */
#endif // SDL_THREAD_WINDOWS

4
src/thread/windows/SDL_sysmutex_c.h
View File

@ -23,9 +23,9 @@
#include "../../core/windows/SDL_windows.h"
typedef SDL_Mutex *(*pfnSDL_CreateMutex)(void);
typedef int (*pfnSDL_LockMutex)(SDL_Mutex *);
typedef void (*pfnSDL_LockMutex)(SDL_Mutex *);
typedef int (*pfnSDL_TryLockMutex)(SDL_Mutex *);
typedef int (*pfnSDL_UnlockMutex)(SDL_Mutex *);
typedef void (*pfnSDL_UnlockMutex)(SDL_Mutex *);
typedef void (*pfnSDL_DestroyMutex)(SDL_Mutex *);
typedef enum

88
src/thread/windows/SDL_sysrwlock_srw.c
View File

@ -57,11 +57,11 @@ static pfnTryAcquireSRWLockExclusive pTryAcquireSRWLockExclusive = NULL;
typedef SDL_RWLock *(*pfnSDL_CreateRWLock)(void);
typedef void (*pfnSDL_DestroyRWLock)(SDL_RWLock *);
typedef int (*pfnSDL_LockRWLockForReading)(SDL_RWLock *);
typedef int (*pfnSDL_LockRWLockForWriting)(SDL_RWLock *);
typedef void (*pfnSDL_LockRWLockForReading)(SDL_RWLock *);
typedef void (*pfnSDL_LockRWLockForWriting)(SDL_RWLock *);
typedef int (*pfnSDL_TryLockRWLockForReading)(SDL_RWLock *);
typedef int (*pfnSDL_TryLockRWLockForWriting)(SDL_RWLock *);
typedef int (*pfnSDL_UnlockRWLock)(SDL_RWLock *);
typedef void (*pfnSDL_UnlockRWLock)(SDL_RWLock *);
typedef struct SDL_rwlock_impl_t
{
@ -104,35 +104,28 @@ static void SDL_DestroyRWLock_srw(SDL_RWLock *_rwlock)
}
}
static int SDL_LockRWLockForReading_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
static void SDL_LockRWLockForReading_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
if (rwlock == NULL) {
return SDL_InvalidParamError("rwlock");
if (rwlock != NULL) {
pAcquireSRWLockShared(&rwlock->srw);
}
pAcquireSRWLockShared(&rwlock->srw);
return 0;
}
static int SDL_LockRWLockForWriting_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
static void SDL_LockRWLockForWriting_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
if (rwlock == NULL) {
return SDL_InvalidParamError("rwlock");
if (rwlock != NULL) {
pAcquireSRWLockExclusive(&rwlock->srw);
rwlock->write_owner = SDL_ThreadID();
}
pAcquireSRWLockExclusive(&rwlock->srw);
rwlock->write_owner = SDL_ThreadID();
return 0;
}
static int SDL_TryLockRWLockForReading_srw(SDL_RWLock *_rwlock)
{
SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
int retval = 0;
if (rwlock == NULL) {
retval = SDL_InvalidParamError("rwlock");
} else {
if (rwlock != NULL) {
retval = pTryAcquireSRWLockShared(&rwlock->srw) ? 0 : SDL_RWLOCK_TIMEDOUT;
}
return retval;
@ -142,27 +135,23 @@ static int SDL_TryLockRWLockForWriting_srw(SDL_RWLock *_rwlock)
{
SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
int retval = 0;
if (rwlock == NULL) {
retval = SDL_InvalidParamError("rwlock");
} else {
if (rwlock != NULL) {
retval = pTryAcquireSRWLockExclusive(&rwlock->srw) ? 0 : SDL_RWLOCK_TIMEDOUT;
}
return retval;
}
static int SDL_UnlockRWLock_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
static void SDL_UnlockRWLock_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
if (rwlock == NULL) {
return SDL_InvalidParamError("rwlock");
} else if (rwlock->write_owner == SDL_ThreadID()) {
rwlock->write_owner = 0;
pReleaseSRWLockExclusive(&rwlock->srw);
} else {
pReleaseSRWLockShared(&rwlock->srw);
if (rwlock != NULL) {
if (rwlock->write_owner == SDL_ThreadID()) {
rwlock->write_owner = 0;
pReleaseSRWLockExclusive(&rwlock->srw);
} else {
pReleaseSRWLockShared(&rwlock->srw);
}
}
return 0;
}
static const SDL_rwlock_impl_t SDL_rwlock_impl_srw = {
@ -234,47 +223,34 @@ void SDL_DestroyRWLock(SDL_RWLock *rwlock)
}
}
int SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (rwlock == NULL) {
return 0;
if (rwlock != NULL) {
SDL_rwlock_impl_active.LockForReading(rwlock);
}
return SDL_rwlock_impl_active.LockForReading(rwlock);
}
int SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (rwlock == NULL) {
return 0;
if (rwlock != NULL) {
SDL_rwlock_impl_active.LockForWriting(rwlock);
}
return SDL_rwlock_impl_active.LockForWriting(rwlock);
}
int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
{
if (rwlock == NULL) {
return 0;
}
return SDL_rwlock_impl_active.TryLockForReading(rwlock);
return rwlock ? SDL_rwlock_impl_active.TryLockForReading(rwlock) : 0;
}
int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
{
if (rwlock == NULL) {
return 0;
}
return SDL_rwlock_impl_active.TryLockForWriting(rwlock);
return rwlock ? SDL_rwlock_impl_active.TryLockForWriting(rwlock) : 0;
}
int SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
void SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
{
if (rwlock == NULL) {
return 0;
if (rwlock != NULL) {
SDL_rwlock_impl_active.Unlock(rwlock);
}
return SDL_rwlock_impl_active.Unlock(rwlock);
}

11
test/testlock.c
View File

@ -80,17 +80,12 @@ Run(void *data)
SDL_Log("Thread %lu: starting up", SDL_ThreadID());
while (!SDL_AtomicGet(&doterminate)) {
SDL_Log("Thread %lu: ready to work\n", SDL_ThreadID());
if (SDL_LockMutex(mutex) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex: %s", SDL_GetError());
exit(1);
}
SDL_LockMutex(mutex);
SDL_Log("Thread %lu: start work!\n", SDL_ThreadID());
SDL_Delay(1 * worktime);
SDL_Log("Thread %lu: work done!\n", SDL_ThreadID());
if (SDL_UnlockMutex(mutex) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't unlock mutex: %s", SDL_GetError());
exit(1);
}
SDL_UnlockMutex(mutex);
/* If this sleep isn't done, then threads may starve */
SDL_Delay(10);
}

23
test/testrwlock.c
View File

@ -33,22 +33,21 @@ static void DoWork(const int workticks) /* "Work" */
const SDL_threadID tid = SDL_ThreadID();
const SDL_bool is_reader = tid != mainthread;
const char *typestr = is_reader ? "Reader" : "Writer";
int rc;
SDL_Log("%s Thread %lu: ready to work\n", typestr, (unsigned long) tid);
rc = is_reader ? SDL_LockRWLockForReading(rwlock) : SDL_LockRWLockForWriting(rwlock);
if (rc < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s Thread %lu: Couldn't lock rwlock: %s", typestr, (unsigned long) tid, SDL_GetError());
if (is_reader) {
SDL_LockRWLockForReading(rwlock);
} else {
SDL_Log("%s Thread %lu: start work!\n", typestr, (unsigned long) tid);
SDL_Delay(workticks);
SDL_Log("%s Thread %lu: work done!\n", typestr, (unsigned long) tid);
if (SDL_UnlockRWLock(rwlock) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s Thread %lu: Couldn't unlock rwlock: %s", typestr, (unsigned long) tid, SDL_GetError());
}
/* If this sleep isn't done, then threads may starve */
SDL_Delay(10);
SDL_LockRWLockForWriting(rwlock);
}
SDL_Log("%s Thread %lu: start work!\n", typestr, (unsigned long) tid);
SDL_Delay(workticks);
SDL_Log("%s Thread %lu: work done!\n", typestr, (unsigned long) tid);
SDL_UnlockRWLock(rwlock);
/* If this sleep isn't done, then threads may starve */
SDL_Delay(10);
}
static int SDLCALL