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windows: Use InitializeSRWLock explicitly. 

The docs say you should, if not statically initializing an SRWLOCK--which
we aren't--but in practice this is probably just being pedantic.

Still, better (thread) safe than sorry!
This commit is contained in:
Ryan C. Gordon 2023-04-26 14:04:57 -04:00
parent 70a501d8ec
commit 776820526b
1 changed files with 7 additions and 2 deletions
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9
src/thread/windows/SDL_sysmutex.c
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@ -41,13 +41,16 @@ SDL_mutex_impl_t SDL_mutex_impl_active = { 0 };
#ifdef __WINRT__
/* Functions are guaranteed to be available */
#define pInitializeSRWLock InitializeSRWLock
#define pReleaseSRWLockExclusive ReleaseSRWLockExclusive
#define pAcquireSRWLockExclusive AcquireSRWLockExclusive
#define pTryAcquireSRWLockExclusive TryAcquireSRWLockExclusive
#else
typedef VOID(WINAPI *pfnInitializeSRWLock)(PSRWLOCK);
typedef VOID(WINAPI *pfnReleaseSRWLockExclusive)(PSRWLOCK);
typedef VOID(WINAPI *pfnAcquireSRWLockExclusive)(PSRWLOCK);
typedef BOOLEAN(WINAPI *pfnTryAcquireSRWLockExclusive)(PSRWLOCK);
static pfnInitializeSRWLock pInitializeSRWLock = NULL;
static pfnReleaseSRWLockExclusive pReleaseSRWLockExclusive = NULL;
static pfnAcquireSRWLockExclusive pAcquireSRWLockExclusive = NULL;
static pfnTryAcquireSRWLockExclusive pTryAcquireSRWLockExclusive = NULL;
@ -57,12 +60,13 @@ static SDL_mutex *SDL_CreateMutex_srw(void)
{
SDL_mutex_srw *mutex;
/* Relies on SRWLOCK_INIT == 0. */
mutex = (SDL_mutex_srw *)SDL_calloc(1, sizeof(*mutex));
if (mutex == NULL) {
SDL_OutOfMemory();
}
pInitializeSRWLock(&mutex->srw);
return (SDL_mutex *)mutex;
}
@ -232,11 +236,12 @@ SDL_CreateMutex(void)
HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
if (kernel32) {
/* Requires Vista: */
pInitializeSRWLock = (pfnInitializeSRWLock)GetProcAddress(kernel32, "InitializeSRWLock");
pReleaseSRWLockExclusive = (pfnReleaseSRWLockExclusive)GetProcAddress(kernel32, "ReleaseSRWLockExclusive");
pAcquireSRWLockExclusive = (pfnAcquireSRWLockExclusive)GetProcAddress(kernel32, "AcquireSRWLockExclusive");
/* Requires 7: */
pTryAcquireSRWLockExclusive = (pfnTryAcquireSRWLockExclusive)GetProcAddress(kernel32, "TryAcquireSRWLockExclusive");
if (pReleaseSRWLockExclusive && pAcquireSRWLockExclusive && pTryAcquireSRWLockExclusive) {
if (pInitializeSRWLock && pReleaseSRWLockExclusive && pAcquireSRWLockExclusive && pTryAcquireSRWLockExclusive) {
impl = &SDL_mutex_impl_srw;
}
}