#include "Proftimer.h"
#include "Schedule.h"
#include "Timer.h"
+#include "Capability.h"
#if !defined(mingw32_HOST_OS)
#include "Itimer.h"
/* ticks left before next pre-emptive context switch */
static int ticks_to_ctxt_switch = 0;
+#if defined(RTS_SUPPORTS_THREADS)
+/* idle ticks left before we perform a GC */
+static int ticks_to_gc = 0;
+#endif
+
/*
* Function: handle_tick()
*
if (ticks_to_ctxt_switch <= 0) {
ticks_to_ctxt_switch = RtsFlags.ConcFlags.ctxtSwitchTicks;
context_switch = 1; /* schedule a context switch */
+
+#if defined(RTS_SUPPORTS_THREADS)
+ /*
+ * 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 */
+ threadRunnable();
+ /* ToDo: this threadRunnable only works if there's
+ * another thread (not this one) waiting to be woken up
+ */
+ }
+ break;
+ default:
+ break;
+ }
+#endif
}
}
}