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avoid deadlocks after forking threaded processes

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This commit is contained in:
Daniel Micay 2018-08-23 17:15:50 -04:00
parent daa44905ee
commit 4aa0fab4f4
1 changed files with 27 additions and 0 deletions
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27
malloc.c
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@ -525,6 +525,31 @@ static void regions_delete(struct region_info *region) {
}
}
static void pre_fork(void) {
pthread_mutex_lock(&regions_lock);
for (unsigned i = 0; i < N_SIZE_CLASSES; i++) {
pthread_mutex_lock(&size_class_metadata[i].mutex);
}
}
static void post_fork_parent(void) {
pthread_mutex_unlock(&regions_lock);
for (unsigned i = 0; i < N_SIZE_CLASSES; i++) {
pthread_mutex_unlock(&size_class_metadata[i].mutex);
}
}
static void post_fork_child(void) {
if (pthread_mutex_init(&regions_lock, NULL)) {
fatal_error("mutex initialization failed");
}
for (unsigned i = 0; i < N_SIZE_CLASSES; i++) {
if (pthread_mutex_init(&size_class_metadata[i].mutex, NULL)) {
fatal_error("mutex initialization failed");
}
}
}
COLD static void init_slow_path(void) {
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
@ -535,6 +560,8 @@ COLD static void init_slow_path(void) {
return;
}
pthread_atfork(pre_fork, post_fork_parent, post_fork_child);
struct random_state rng;
random_state_init(&rng);