update submodules for GHC.HetMet.GArrow -> Control.GArrow renaming

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

diff --git a/rts/Timer.c b/rts/Timer.c
index 0bfea2d..02d106f 100644 (file)
--- a/rts/Timer.c
+++ b/rts/Timer.c
@@ -14,13 +14,16 @@
  * on platform-specific services to install and run the timers.
  *
  */
+
+#include "PosixSource.h"
 #include "Rts.h"
-#include "RtsFlags.h"
+
+#include "Timer.h"
 #include "Proftimer.h"
 #include "Schedule.h"
-#include "Timer.h"
 #include "Ticker.h"
 #include "Capability.h"
+#include "RtsSignals.h"
 
 /* ticks left before next pre-emptive context switch */
 static int ticks_to_ctxt_switch = 0;
@@ -40,43 +43,41 @@ static
 void
 handle_tick(int unused STG_UNUSED)
 {
-#ifdef PROFILING
   handleProfTick();
-#endif
   if (RtsFlags.ConcFlags.ctxtSwitchTicks > 0) {
       ticks_to_ctxt_switch--;
       if (ticks_to_ctxt_switch <= 0) {
          ticks_to_ctxt_switch = RtsFlags.ConcFlags.ctxtSwitchTicks;
-         context_switch = 1;   /* schedule a context switch */
+         setContextSwitches(); /* schedule a context switch */
       }
   }
 
 #if defined(THREADED_RTS)
   /* 
-   * If we've been inactive for idleGCDelayTicks (set by +RTS
+   * If we've been inactive for idleGCDelayTime (set by +RTS
    * -I), tell the scheduler to wake up and do a GC, to check
    * for threads that are deadlocked.
    */
   switch (recent_activity) {
   case ACTIVITY_YES:
       recent_activity = ACTIVITY_MAYBE_NO;
-      ticks_to_gc = RtsFlags.GcFlags.idleGCDelayTicks;
+      ticks_to_gc = RtsFlags.GcFlags.idleGCDelayTime /
+                    RtsFlags.MiscFlags.tickInterval;
       break;
   case ACTIVITY_MAYBE_NO:
-      if (ticks_to_gc == 0) break; /* 0 ==> no idle GC */
-      ticks_to_gc--;
       if (ticks_to_gc == 0) {
-         ticks_to_gc = RtsFlags.GcFlags.idleGCDelayTicks;
-         recent_activity = ACTIVITY_INACTIVE;
-         blackholes_need_checking = rtsTrue;
-         /* hack: re-use the blackholes_need_checking flag */
-         
-         /* ToDo: this doesn't work.  Can't invoke
-          * pthread_cond_signal from a signal handler.
-          * Furthermore, we can't prod a capability that we
-          * might be holding.  What can we do?
-          */
-         prodOneCapability();
+          /* 0 ==> no idle GC */
+          recent_activity = ACTIVITY_DONE_GC;
+          // disable timer signals (see #1623)
+          stopTimer();
+      } else {
+          ticks_to_gc--;
+          if (ticks_to_gc == 0) {
+              ticks_to_gc = RtsFlags.GcFlags.idleGCDelayTime /
+                  RtsFlags.MiscFlags.tickInterval;
+              recent_activity = ACTIVITY_INACTIVE;
+              wakeUpRts();
+          }
       }
       break;
   default:
@@ -85,18 +86,49 @@ handle_tick(int unused STG_UNUSED)
 #endif
 }
 
-int
-startTimer(nat ms)
+// This global counter is used to allow multiple threads to stop the
+// timer temporarily with a stopTimer()/startTimer() pair.  If 
+//      timer_enabled  == 0          timer is enabled
+//      timer_disabled == N, N > 0   timer is disabled by N threads
+// When timer_enabled makes a transition to 0, we enable the timer,
+// and when it makes a transition to non-0 we disable it.
+
+static StgWord timer_disabled;
+
+void
+initTimer(void)
 {
-#ifdef PROFILING
-  initProfTimer();
-#endif
+    initProfTimer();
+    if (RtsFlags.MiscFlags.tickInterval != 0) {
+        initTicker(RtsFlags.MiscFlags.tickInterval, handle_tick);
+    }
+    timer_disabled = 1;
+}
+
+void
+startTimer(void)
+{
+    if (atomic_dec(&timer_disabled) == 0) {
+        if (RtsFlags.MiscFlags.tickInterval != 0) {
+            startTicker();
+        }
+    }
+}
 
-  return startTicker(ms, handle_tick);
+void
+stopTimer(void)
+{
+    if (atomic_inc(&timer_disabled) == 1) {
+        if (RtsFlags.MiscFlags.tickInterval != 0) {
+            stopTicker();
+        }
+    }
 }
 
-int
-stopTimer()
+void
+exitTimer (rtsBool wait)
 {
-  return stopTicker();
+    if (RtsFlags.MiscFlags.tickInterval != 0) {
+        exitTicker(wait);
+    }
 }