+#ifdef NACL
+extern int nacl_thread_parked[MAX_NACL_GC_THREADS];
+extern int nacl_thread_used[MAX_NACL_GC_THREADS];
+extern int nacl_thread_parking_inited;
+extern int nacl_num_gc_threads;
+extern pthread_mutex_t nacl_thread_alloc_lock;
+extern __thread int nacl_thread_idx;
+extern __thread GC_thread nacl_gc_thread_self;
+
+void nacl_initialize_gc_thread()
+{
+ int i;
+ pthread_mutex_lock(&nacl_thread_alloc_lock);
+ if (!nacl_thread_parking_inited)
+ {
+ for (i = 0; i < MAX_NACL_GC_THREADS; i++) {
+ nacl_thread_used[i] = 0;
+ nacl_thread_parked[i] = 0;
+ }
+ nacl_thread_parking_inited = 1;
+ }
+ GC_ASSERT(nacl_num_gc_threads <= MAX_NACL_GC_THREADS);
+ for (i = 0; i < MAX_NACL_GC_THREADS; i++) {
+ if (nacl_thread_used[i] == 0) {
+ nacl_thread_used[i] = 1;
+ nacl_thread_idx = i;
+ nacl_num_gc_threads++;
+ break;
+ }
+ }
+ pthread_mutex_unlock(&nacl_thread_alloc_lock);
+}
+
+void nacl_shutdown_gc_thread()
+{
+ pthread_mutex_lock(&nacl_thread_alloc_lock);
+ GC_ASSERT(nacl_thread_idx >= 0 && nacl_thread_idx < MAX_NACL_GC_THREADS);
+ GC_ASSERT(nacl_thread_used[nacl_thread_idx] != 0);
+ nacl_thread_used[nacl_thread_idx] = 0;
+ nacl_thread_idx = -1;
+ nacl_num_gc_threads--;
+ pthread_mutex_unlock(&nacl_thread_alloc_lock);
+}
+
+#endif /* NACL */
+