/* -----------------------------------------------------------------------------
*
- * (c) The GHC Team, 1995-2003
+ * (c) The GHC Team, 1995-2005
*
* Interval timer service for profiling and pre-emptive scheduling.
*
#include "Proftimer.h"
#include "Schedule.h"
#include "Timer.h"
+#include "Ticker.h"
#include "Capability.h"
-#if !defined(mingw32_HOST_OS)
-#include "Itimer.h"
-#else
-#include "win32/Ticker.h"
-#endif
-
/* ticks left before next pre-emptive context switch */
static int ticks_to_ctxt_switch = 0;
+#if defined(THREADED_RTS)
+/* idle ticks left before we perform a GC */
+static int ticks_to_gc = 0;
+#endif
+
/*
* Function: handle_tick()
*
ticks_to_ctxt_switch = RtsFlags.ConcFlags.ctxtSwitchTicks;
context_switch = 1; /* schedule a context switch */
-#if defined(RTS_SUPPORTS_THREADS)
+#if defined(THREADED_RTS)
/*
- * If we've been inactive for a whole time slice, tell the
- * scheduler to wake up and do a GC, to check for threads
- * that are deadlocked.
+ * If we've been inactive for idleGCDelayTicks (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;
break;
case ACTIVITY_MAYBE_NO:
- recent_activity = ACTIVITY_INACTIVE;
- blackholes_need_checking = rtsTrue;
- /* hack: re-use the blackholes_need_checking flag */
- threadRunnable();
- /* ToDo: this threadRunnable only works if there's
- * another thread (not this one) waiting to be woken up
- */
+ 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();
+ }
break;
default:
break;