continue;
}
cap->running_task = task;
+
+ if (cap->spare_workers) {
+ // Look for workers that have died without removing
+ // themselves from the list; this could happen if the OS
+ // summarily killed the thread, for example. This
+ // actually happens on Windows when the system is
+ // terminating the program, and the RTS is running in a
+ // DLL.
+ Task *t, *prev;
+ prev = NULL;
+ for (t = cap->spare_workers; t != NULL; t = t->next) {
+ if (!osThreadIsAlive(t->id)) {
+ debugTrace(DEBUG_sched,
+ "worker thread %p has died unexpectedly", (void *)t->id);
+ if (!prev) {
+ cap->spare_workers = t->next;
+ } else {
+ prev->next = t->next;
+ }
+ prev = t;
+ }
+ }
+ }
+
if (!emptyRunQueue(cap) || cap->spare_workers) {
debugTrace(DEBUG_sched,
"runnable threads or workers still alive, yielding");