Fix building RTS with gcc 2.*; declare all variables at the top of a block

[ghc-hetmet.git] / rts / Schedule.c

diff --git a/rts/Schedule.c b/rts/Schedule.c
index 8bd4241..5ebb685 100644 (file)
--- a/rts/Schedule.c
+++ b/rts/Schedule.c
@@ -593,7 +593,19 @@ run_thread:
 
     dirtyTSO(t);
 
-    recent_activity = ACTIVITY_YES;
+#if defined(THREADED_RTS)
+    if (recent_activity == ACTIVITY_DONE_GC) {
+        // ACTIVITY_DONE_GC means we turned off the timer signal to
+        // conserve power (see #1623).  Re-enable it here.
+        nat prev;
+        prev = xchg(&recent_activity, ACTIVITY_YES);
+        if (prev == ACTIVITY_DONE_GC) {
+            startTimer();
+        }
+    } else {
+        recent_activity = ACTIVITY_YES;
+    }
+#endif
 
     switch (prev_what_next) {
        
@@ -974,6 +986,8 @@ scheduleDetectDeadlock (Capability *cap, Task *task)
        cap = scheduleDoGC (cap, task, rtsTrue/*force  major GC*/);
 
        recent_activity = ACTIVITY_DONE_GC;
+        // disable timer signals (see #1623)
+        stopTimer();
        
        if ( !emptyRunQueue(cap) ) return;
 
@@ -2185,6 +2199,7 @@ forkProcess(HsStablePtr *entry
 
         // On Unix, all timers are reset in the child, so we need to start
         // the timer again.
+        initTimer();
         startTimer();
 
        cap = rts_evalStableIO(cap, entry, NULL);  // run the action
@@ -2531,6 +2546,7 @@ initScheduler(void)
 
   context_switch = 0;
   sched_state    = SCHED_RUNNING;
+  recent_activity = ACTIVITY_YES;
 
 #if defined(THREADED_RTS)
   /* Initialise the mutex and condition variables used by
@@ -3093,10 +3109,10 @@ findRetryFrameHelper (StgTSO *tso)
        return CATCH_RETRY_FRAME;
       
     case CATCH_STM_FRAME: {
-        debugTrace(DEBUG_stm,
-                  "found CATCH_STM_FRAME at %p during retry", p);
         StgTRecHeader *trec = tso -> trec;
        StgTRecHeader *outer = stmGetEnclosingTRec(trec);
+        debugTrace(DEBUG_stm,
+                  "found CATCH_STM_FRAME at %p during retry", p);
         debugTrace(DEBUG_stm, "trec=%p outer=%p", trec, outer);
        stmAbortTransaction(tso -> cap, trec);
        stmFreeAbortedTRec(tso -> cap, trec);