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Use atomic variables for thread communication

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Fixes https://github.com/libsdl-org/SDL/issues/10711

(cherry picked from commit a0f36fb85b)
(cherry picked from commit a75227aaeb)
This commit is contained in:
Sam Lantinga
2024-09-05 05:35:03 -07:00
parent 85b2733324
commit ba9b075eba
2 changed files with 12 additions and 11 deletions
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12
test/testthread.c
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@@ -19,7 +19,7 @@
#include "SDL.h"
static SDL_TLSID tls;
static int alive = 0;
static SDL_atomic_t alive;
static int testprio = 0;
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
@@ -55,7 +55,7 @@ ThreadFunc(void *data)
SDL_TLSSet(tls, "baby thread", NULL);
SDL_Log("Started thread %s: My thread id is %lu, thread data = %s\n",
(char *)data, SDL_ThreadID(), (const char *)SDL_TLSGet(tls));
while (alive) {
while (SDL_AtomicGet(&alive)) {
SDL_Log("Thread '%s' is alive!\n", (char *)data);
if (testprio) {
@@ -76,7 +76,7 @@ killed(int sig)
{
SDL_Log("Killed with SIGTERM, waiting 5 seconds to exit\n");
SDL_Delay(5 * 1000);
alive = 0;
SDL_AtomicSet(&alive, 0);
quit(0);
}
@@ -112,7 +112,7 @@ int main(int argc, char *argv[])
SDL_TLSSet(tls, "main thread", NULL);
SDL_Log("Main thread data initially: %s\n", (const char *)SDL_TLSGet(tls));
alive = 1;
SDL_AtomicSet(&alive, 1);
thread = SDL_CreateThread(ThreadFunc, "One", "#1");
if (!thread) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
@@ -120,12 +120,12 @@ int main(int argc, char *argv[])
}
SDL_Delay(5 * 1000);
SDL_Log("Waiting for thread #1\n");
alive = 0;
SDL_AtomicSet(&alive, 0);
SDL_WaitThread(thread, NULL);
SDL_Log("Main thread data finally: %s\n", (const char *)SDL_TLSGet(tls));
alive = 1;
SDL_AtomicSet(&alive, 1);
(void)signal(SIGTERM, killed);
thread = SDL_CreateThread(ThreadFunc, "Two", "#2");
if (!thread) {