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thread: Locking mutexes and rwlocks are now void functions.

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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.
This commit is contained in:
Ryan C. Gordon
2023-10-25 10:00:26 -04:00
parent 082ef41566
commit 899eb0d042
21 changed files with 496 additions and 746 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
src/thread/pthread/SDL_sysrwlock.c
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@@ -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;
}