Only create a semaphore if an environment variable exists. And then assume that the semaphore already exists and was created by a parent process

Author: bunjj

src/aotcompile.cpp

@@ -1661,16 +1661,13 @@ void jl_dump_native_impl(void *native_code,
     sem_t *sem = SEM_FAILED;
     const char *sem_name = getenv("RAI_CC_SEM_NAME");
     if (sem_name != NULL) {
-        sem = sem_open(sem_name, O_CREAT, 0644, 4);
-    } else {
-        // Use default name for debugging purposes
-        sem = sem_open("/jl_aotcompile_sem", O_CREAT, 0644, 4);
-    }
-    std::unique_ptr<sem_t, decltype(cleanup)> sem_guard(sem, cleanup);
-    if (sem == SEM_FAILED) {
-        jl_printf(JL_STDERR, "Failed to create semaphore: %s\n", strerror(errno));
-    } else {
-        sem_wait(sem);
+        sem = sem_open(sem_name, 0);
+        std::unique_ptr<sem_t, decltype(cleanup)> sem_guard(sem, cleanup);
+        if (sem == SEM_FAILED) {
+            jl_printf(JL_STDERR, "Failed to create semaphore: %s\n", strerror(errno));
+        } else {
+            sem_wait(sem);
+        }
     }
     #endif