[project @ 2000-08-03 11:28:35 by simonmar]

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

diff --git a/ghc/rts/Schedule.c b/ghc/rts/Schedule.c
index 68f2210..ed0389f 100644 (file)
--- a/ghc/rts/Schedule.c
+++ b/ghc/rts/Schedule.c
@@ -1,5 +1,5 @@
 /* ---------------------------------------------------------------------------
- * $Id: Schedule.c,v 1.70 2000/05/08 15:57:01 simonmar Exp $
+ * $Id: Schedule.c,v 1.74 2000/08/03 11:28:35 simonmar Exp $
  *
  * (c) The GHC Team, 1998-2000
  *
@@ -516,7 +516,7 @@ schedule( void )
     }
     
     /* check for signals each time around the scheduler */
-#ifndef __MINGW32__
+#ifndef mingw32_TARGET_OS
     if (signals_pending()) {
       start_signal_handlers();
     }
@@ -850,12 +850,16 @@ schedule( void )
     
     cap->rCurrentTSO = t;
     
-    /* set the context_switch flag
+    /* context switches are now initiated by the timer signal, unless
+     * the user specified "context switch as often as possible", with
+     * +RTS -C0
      */
-    if (run_queue_hd == END_TSO_QUEUE)
-      context_switch = 0;
+    if (RtsFlags.ConcFlags.ctxtSwitchTicks == 0
+       && (run_queue_hd != END_TSO_QUEUE
+           || blocked_queue_hd != END_TSO_QUEUE))
+       context_switch = 1;
     else
-      context_switch = 1;
+       context_switch = 0;
 
     RELEASE_LOCK(&sched_mutex);
 
@@ -1189,7 +1193,7 @@ suspendThread( Capability *cap )
   ACQUIRE_LOCK(&sched_mutex);
 
   IF_DEBUG(scheduler,
-          sched_belch("thread %d did a _ccall_gc\n", cap->rCurrentTSO->id));
+          sched_belch("thread %d did a _ccall_gc", cap->rCurrentTSO->id));
 
   threadPaused(cap->rCurrentTSO);
   cap->rCurrentTSO->link = suspended_ccalling_threads;
@@ -1593,6 +1597,9 @@ initScheduler(void)
   context_switch = 0;
   interrupted    = 0;
 
+  RtsFlags.ConcFlags.ctxtSwitchTicks =
+      RtsFlags.ConcFlags.ctxtSwitchTime / TICK_MILLISECS;
+
 #ifdef INTERPRETER
   ecafList = END_ECAF_LIST;
   clearECafTable();