/* -----------------------------------------------------------------------------
*
- * (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"
-
-#if !defined(mingw32_TARGET_OS)
-#include "Itimer.h"
-#else
-#include "win32/Ticker.h"
-#endif
+#include "Ticker.h"
+#include "Capability.h"
/* 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()
*
* At each occurrence of a tick, the OS timer will invoke
* handle_tick().
*/
+static
void
handle_tick(int unused STG_UNUSED)
{
if (ticks_to_ctxt_switch <= 0) {
ticks_to_ctxt_switch = RtsFlags.ConcFlags.ctxtSwitchTicks;
context_switch = 1; /* schedule a context switch */
+
+#if defined(THREADED_RTS)
+ /*
+ * 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:
+ 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;
+ }
+#endif
}
}
}
initProfTimer();
#endif
- return startTicker(ms);
+ return startTicker(ms, handle_tick);
}
int