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replace atomics with C11/C++ atomics with explicit memory order; passes tsan. Issue #130

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daan
2020-07-26 18:00:38 -07:00
parent a468430772
commit ef8e5d18a6
14 changed files with 248 additions and 315 deletions
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4
src/random.c
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@@ -210,11 +210,11 @@ static bool os_random_buf(void* buf, size_t buf_len) {
#define GRND_NONBLOCK (1)
#endif
static _Atomic(uintptr_t) no_getrandom; // = 0
if (mi_atomic_read(&no_getrandom)==0) {
if (mi_atomic_load_acquire(&no_getrandom)==0) {
ssize_t ret = syscall(SYS_getrandom, buf, buf_len, GRND_NONBLOCK);
if (ret >= 0) return (buf_len == (size_t)ret);
if (ret != ENOSYS) return false;
mi_atomic_write(&no_getrandom,1); // don't call again, and fall back to /dev/urandom
mi_atomic_store_release(&no_getrandom,1); // don't call again, and fall back to /dev/urandom
}
#endif
int flags = O_RDONLY;