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Replace data race with use of pthread_once (ft_shm_init)

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This commit is contained in:
Ian Jackson
2025-01-21 18:50:07 +00:00
parent 2503b0fffc
commit d9ba684b18
1 changed files with 8 additions and 6 deletions
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14
src/libfaketime.c
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@@ -521,16 +521,20 @@ static void ft_shm_destroy(void)
}
}
static pthread_once_t ft_shm_initialized_once_control = PTHREAD_ONCE_INIT;
static void ft_shm_really_init (void);
static void ft_shm_init (void)
{
pthread_once(&ft_shm_initialized_once_control, ft_shm_really_init);
}
static void ft_shm_really_init (void)
{
int ticks_shm_fd;
char sem_name[256], shm_name[256], *ft_shared_env = getenv("FAKETIME_SHARED");
sem_t *shared_semR = NULL;
static int nt=1;
static int ft_shm_initialized = 0;
/* do all of this once only */
if (ft_shm_initialized > 0) return;
/* create semaphore and shared memory locally unless it has been passed along */
if (ft_shared_env == NULL)
@@ -610,8 +614,6 @@ static void ft_shm_init (void)
{ /* force the deletion of the shm sync env variable */
unsetenv("FAKETIME_SHARED");
}
ft_shm_initialized = 1;
}
static void ft_cleanup (void)