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Remove leaf attribute where appropriate
This change fixes a bug where gcc assumed thread synchronization such as pthread_cond_wait() wouldn't alter static variables, because the headers were using __attribute__((__leaf__)) inappropriately.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // for justine with love 2025-01-02 | ||
| #include <poll.h> | ||
| #include <pthread.h> | ||
| #include <signal.h> | ||
| #include <stdatomic.h> | ||
| #include <stdbool.h> | ||
| #include <stdlib.h> | ||
| #include <unistd.h> | ||
|
|
||
| static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; | ||
| static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; | ||
| static bool altstack_installed; | ||
|
|
||
| static void* chump(void* v) { | ||
| stack_t* s = v; | ||
| if (sigaltstack(s, NULL)) { | ||
| pthread_mutex_lock(&lock); | ||
| altstack_installed = true; | ||
| pthread_mutex_unlock(&lock); | ||
| pthread_cond_signal(&cond); | ||
| return NULL; | ||
| } | ||
| pthread_mutex_lock(&lock); | ||
| altstack_installed = true; | ||
| pthread_cond_signal(&cond); | ||
| pthread_mutex_unlock(&lock); | ||
| while (1) | ||
| poll(NULL, 0, -1); | ||
| return NULL; | ||
| } | ||
|
|
||
| int main(void) { | ||
| void* v; | ||
| stack_t s = {.ss_size = sysconf(_SC_SIGSTKSZ)}; | ||
| s.ss_sp = malloc(s.ss_size); | ||
| if (s.ss_sp == NULL) | ||
| return EXIT_FAILURE; | ||
| pthread_t tid; | ||
| if (pthread_create(&tid, NULL, chump, &s)) | ||
| return EXIT_FAILURE; | ||
| pthread_mutex_lock(&lock); | ||
| while (!altstack_installed) | ||
| pthread_cond_wait(&cond, &lock); | ||
| pthread_mutex_unlock(&lock); | ||
| free(s.ss_sp); | ||
| if (pthread_cancel(tid) || pthread_join(tid, &v)) | ||
| return EXIT_FAILURE; | ||
| return v == PTHREAD_CANCELED ? EXIT_SUCCESS : EXIT_FAILURE; | ||
| } |
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