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Code Issues 1 Releases Wiki Activity

Fix init race for environ lock.

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This commit is contained in:
Andrew Chambers 2021-08-09 14:06:53 +12:00
parent c94d7574bc
commit f2e8691ad5
1 changed files with 10 additions and 4 deletions
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14
src/core/os.c
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@ -84,7 +84,6 @@ time_t timegm(struct tm *tm);
* setenv/getenv are not thread safe. */
#ifdef JANET_THREADS
# ifdef JANET_WINDOWS
static int env_lock_initialized = 0;
static CRITICAL_SECTION env_lock;
static void janet_lock_environ(void) {
EnterCriticalSection(&env_lock);
@ -2146,10 +2145,17 @@ void janet_lib_os(JanetTable *env) {
#if !defined(JANET_REDUCED_OS) && defined(JANET_WINDOWS) && defined(JANET_THREADS)
/* During start up, the top-most abstract machine (thread)
* in the thread tree sets up the critical section. */
if (!env_lock_initialized) {
InitializeCriticalSection(&env_lock);
env_lock_initialized = 1;
static volatile long env_lock_initializing = 0;
static volatile long env_lock_initialized = 0;
if(!InterlockedExchange(&env_lock_initializing, 1)){
InitializeCriticalSection(&env_lock);
InterlockedOr(&env_lock_initialized, 1);
} else {
while (!InterlockedOr(&env_lock_initialized, 0)) {
Sleep(0);
}
}
#endif
#ifndef JANET_NO_PROCESSES
#endif