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Use atomic variables for thread communication

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Fixes https://github.com/libsdl-org/SDL/issues/10711
This commit is contained in:
Sam Lantinga
2024-09-05 05:35:03 -07:00
parent 41810c823d
commit a0f36fb85b
2 changed files with 11 additions and 10 deletions
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9
test/torturethread.c
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@@ -37,7 +37,8 @@ quit(int rc)
static int SDLCALL
SubThreadFunc(void *data)
{
while (!*(int volatile *)data) {
SDL_AtomicInt *flag = (SDL_AtomicInt *)data;
while (!SDL_AtomicGet(flag)) {
SDL_Delay(10);
}
return 0;
@@ -47,7 +48,7 @@ static int SDLCALL
ThreadFunc(void *data)
{
SDL_Thread *sub_threads[NUMTHREADS];
int flags[NUMTHREADS];
SDL_AtomicInt flags[NUMTHREADS];
int i;
int tid = (int)(uintptr_t)data;
@@ -56,7 +57,7 @@ ThreadFunc(void *data)
for (i = 0; i < NUMTHREADS; i++) {
char name[64];
(void)SDL_snprintf(name, sizeof(name), "Child%d_%d", tid, i);
flags[i] = 0;
SDL_AtomicSet(&flags[i], 0);
sub_threads[i] = SDL_CreateThread(SubThreadFunc, name, &flags[i]);
}
@@ -67,7 +68,7 @@ ThreadFunc(void *data)
SDL_Log("Thread '%d' sending signals to subthreads\n", tid);
for (i = 0; i < NUMTHREADS; i++) {
flags[i] = 1;
SDL_AtomicSet(&flags[i], 1);
SDL_WaitThread(sub_threads[i], NULL);
}