X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FCapability.c;h=73a3427d7eb2838f5b443b6370de7411849ebea3;hb=a60af39758448f92d8eaa3b62072f9adcdbbee9d;hp=510656f473b6c4911f54e32b12cc50cca2e87b1f;hpb=ed12b7043fa98928f75c289a756fbcef546315f8;p=ghc-hetmet.git

diff --git a/rts/Capability.c b/rts/Capability.c
index 510656f..73a3427 100644
--- a/rts/Capability.c
+++ b/rts/Capability.c
@@ -664,6 +664,30 @@ shutdownCapability (Capability *cap, Task *task)
 	    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");