+ /* ULONG_MAX stands for infinity. */
+ if (__builtin_expect (gomp_thread_limit_var == ULONG_MAX, 1)
+ || max_num_threads == 1)
+ return max_num_threads;
+
+#ifdef HAVE_SYNC_BUILTINS
+ do
+ {
+ remaining = gomp_remaining_threads_count;
+ num_threads = max_num_threads;
+ if (num_threads > remaining)
+ num_threads = remaining + 1;
+ }
+ while (__sync_val_compare_and_swap (&gomp_remaining_threads_count,
+ remaining, remaining - num_threads + 1)
+ != remaining);
+#else
+ gomp_mutex_lock (&gomp_remaining_threads_lock);
+ num_threads = max_num_threads;
+ remaining = gomp_remaining_threads_count;
+ if (num_threads > remaining)
+ num_threads = remaining + 1;
+ gomp_remaining_threads_count -= num_threads - 1;
+ gomp_mutex_unlock (&gomp_remaining_threads_lock);
+#endif
+
+ return num_threads;