X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FSchedule.c;h=978adb89c8d7d9c050499a032d812122e2a770be;hb=51cae5224f2f2f5db8b3196d0f5118ba4246701a;hp=9baf755e9fa591b10f1651fcd15a6f6eb88b84fd;hpb=16c651b6d49a99b84821dc47153f0c155430f460;p=ghc-hetmet.git

diff --git a/rts/Schedule.c b/rts/Schedule.c
index 9baf755..978adb8 100644
--- a/rts/Schedule.c
+++ b/rts/Schedule.c
@@ -32,6 +32,7 @@
 #include "Proftimer.h"
 #include "ProfHeap.h"
 #include "GC.h"
+#include "Weak.h"
 
 /* PARALLEL_HASKELL includes go here */
 
@@ -281,6 +282,12 @@ schedule (Capability *initialCapability, Task *task)
 	      "### NEW SCHEDULER LOOP (task: %p, cap: %p)",
 	      task, initialCapability);
 
+  if (running_finalizers) {
+      errorBelch("error: a C finalizer called back into Haskell.\n"
+                 "   use Foreign.Concurrent.newForeignPtr for Haskell finalizers.");
+      stg_exit(EXIT_FAILURE);
+  }
+
   schedulePreLoop();
 
   // -----------------------------------------------------------
@@ -1403,10 +1410,9 @@ scheduleHandleThreadFinished (Capability *cap STG_UNUSED, Task *task, StgTSO *t)
 	       (unsigned long)t->id, whatNext_strs[t->what_next]);
 
     // blocked exceptions can now complete, even if the thread was in
-    // blocked mode (see #2910).  The thread is already marked
-    // ThreadComplete, so any further throwTos will complete
-    // immediately and we don't need to worry about synchronising with
-    // those.
+    // blocked mode (see #2910).  This unconditionally calls
+    // lockTSO(), which ensures that we don't miss any threads that
+    // are engaged in throwTo() with this thread as a target.
     awakenBlockedExceptionQueue (cap, t);
 
       //
@@ -1988,7 +1994,10 @@ resumeThread (void *task_)
     debugTrace(DEBUG_sched, "thread %lu: re-entering RTS", (unsigned long)tso->id);
     
     if (tso->why_blocked == BlockedOnCCall) {
-	awakenBlockedExceptionQueue(cap,tso);
+        // avoid locking the TSO if we don't have to
+        if (tso->blocked_exceptions != END_TSO_QUEUE) {
+            awakenBlockedExceptionQueue(cap,tso);
+        }
 	tso->flags &= ~(TSO_BLOCKEX | TSO_INTERRUPTIBLE);
     }