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atomic: Fix and cleanup SDL_UnlockSpinlock()

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- Add missing SDL_MemoryBarrierRelease() in the generic codepath
- Remove Watcom and MSVC x86/x64 cases which are now identical to the generic codepath
- Fix Solaris barrier to ensure prior stores are visible before unlocking
This commit is contained in:
Cameron Gutman
2026-04-27 19:48:53 -05:00
parent dd1e04eedf
commit 3ebdcc5b1c
1 changed files with 2 additions and 9 deletions
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src/atomic/SDL_spinlock.c
+2 -9
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@@ -192,20 +192,13 @@ void SDL_AtomicUnlock(SDL_SpinLock *lock)
#elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_ARM64) || defined(_M_ARM64EC)) #elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_ARM64) || defined(_M_ARM64EC))
_InterlockedExchange_rel(lock, 0); _InterlockedExchange_rel(lock, 0);
#elif defined(_MSC_VER)
_ReadWriteBarrier();
*lock = 0;
#elif defined(__WATCOMC__) && defined(__386__)
SDL_CompilerBarrier();
*lock = 0;
#elif defined(__SOLARIS__) #elif defined(__SOLARIS__)
/* Used for Solaris when not using gcc. */ /* Used for Solaris when not using gcc. */
*lock = 0;
membar_producer(); membar_producer();
*lock = 0;
#else #else
SDL_MemoryBarrierRelease();
*lock = 0; *lock = 0;
#endif #endif
} }