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Added SDL_AddAtomicU32()

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Fixes https://github.com/libsdl-org/SDL/issues/13496
This commit is contained in:
Sam Lantinga
2025-08-27 06:07:10 -07:00
parent b795762b62
commit 42f634ff7a
5 changed files with 45 additions and 0 deletions
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18
include/SDL3/SDL_atomic.h
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@@ -596,6 +596,24 @@ extern SDL_DECLSPEC Uint32 SDLCALL SDL_SetAtomicU32(SDL_AtomicU32 *a, Uint32 v);
*/
extern SDL_DECLSPEC Uint32 SDLCALL SDL_GetAtomicU32(SDL_AtomicU32 *a);
/**
* Add to an atomic variable.
*
* This function also acts as a full memory barrier.
*
* ***Note: If you don't know what this function is for, you shouldn't use
* it!***
*
* \param a a pointer to an SDL_AtomicU32 variable to be modified.
* \param v the desired value to add or subtract.
* \returns the previous value of the atomic variable.
*
* \threadsafety It is safe to call this function from any thread.
*
* \since This function is available since SDL 3.2.0.
*/
extern SDL_DECLSPEC Uint32 SDLCALL SDL_AddAtomicU32(SDL_AtomicU32 *a, int v);
/**
* Set a pointer to a new value if it is currently an old value.
*

24
src/atomic/SDL_atomic.c
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@@ -298,6 +298,30 @@ int SDL_AddAtomicInt(SDL_AtomicInt *a, int v)
#endif
}
Uint32 SDL_AddAtomicU32(SDL_AtomicU32 *a, int v)
{
#ifdef HAVE_MSC_ATOMICS
SDL_COMPILE_TIME_ASSERT(atomic_add, sizeof(long) == sizeof(a->value));
return (Uint32)_InterlockedExchangeAdd((long *)&a->value, v);
#elif defined(HAVE_WATCOM_ATOMICS)
SDL_COMPILE_TIME_ASSERT(atomic_add, sizeof(int) == sizeof(a->value));
return (Uint32)_SDL_xadd_watcom((volatile int *)&a->value, v);
#elif defined(HAVE_GCC_ATOMICS)
return __sync_fetch_and_add(&a->value, v);
#elif defined(SDL_PLATFORM_SOLARIS)
Uint32 pv = a->value;
membar_consumer();
atomic_add_int((volatile uint_t *)&a->value, v);
return pv;
#else
Uint32 value;
do {
value = a->value;
} while (!SDL_CompareAndSwapAtomicU32(a, value, (value + v)));
return value;
#endif
}
int SDL_GetAtomicInt(SDL_AtomicInt *a)
{
#ifdef HAVE_ATOMIC_LOAD_N

1
src/dynapi/SDL_dynapi.sym
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@@ -1253,6 +1253,7 @@ SDL3_0.0.0 {
SDL_PutAudioStreamPlanarData;
SDL_GetEventDescription;
SDL_PutAudioStreamDataNoCopy;
SDL_AddAtomicU32;
# extra symbols go here (don't modify this line)
local: *;
};

1
src/dynapi/SDL_dynapi_overrides.h
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@@ -1278,3 +1278,4 @@
#define SDL_PutAudioStreamPlanarData SDL_PutAudioStreamPlanarData_REAL
#define SDL_GetEventDescription SDL_GetEventDescription_REAL
#define SDL_PutAudioStreamDataNoCopy SDL_PutAudioStreamDataNoCopy_REAL
#define SDL_AddAtomicU32 SDL_AddAtomicU32_REAL

1
src/dynapi/SDL_dynapi_procs.h
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@@ -1286,3 +1286,4 @@ SDL_DYNAPI_PROC(SDL_Renderer*,SDL_CreateGPURenderer,(SDL_Window *a,SDL_GPUShader
SDL_DYNAPI_PROC(bool,SDL_PutAudioStreamPlanarData,(SDL_AudioStream *a,const void * const*b,int c,int d),(a,b,c,d),return)
SDL_DYNAPI_PROC(int,SDL_GetEventDescription,(const SDL_Event *a,char *b,int c),(a,b,c),return)
SDL_DYNAPI_PROC(bool,SDL_PutAudioStreamDataNoCopy,(SDL_AudioStream *a,const void *b,int c,SDL_AudioStreamDataCompleteCallback d,void *e),(a,b,c,d,e),return)
SDL_DYNAPI_PROC(Uint32,SDL_AddAtomicU32,(SDL_AtomicU32 *a,int b),(a,b),return)