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

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

diff --git a/ghc/rts/Itimer.c b/ghc/rts/Itimer.c
index 9117157..c327528 100644 (file)
--- a/ghc/rts/Itimer.c
+++ b/ghc/rts/Itimer.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: Itimer.c,v 1.15 2000/07/17 15:09:35 rrt Exp $
+ * $Id: Itimer.c,v 1.16 2000/08/03 11:28:35 simonmar Exp $
  *
  * (c) The GHC Team, 1995-1999
  *
@@ -23,6 +23,7 @@
 #endif
 
 #include "Rts.h"
+#include "RtsFlags.h"
 #include "Itimer.h"
 #include "Proftimer.h"
 #include "Schedule.h"
@@ -45,6 +46,9 @@
  
 lnat total_ticks = 0;
 
+/* ticks left before next pre-emptive context switch */
+int ticks_to_ctxt_switch = 0;
+
 static
 void
 #if defined(mingw32_TARGET_OS) || (defined(cygwin32_TARGET_OS) && !defined(HAVE_SETITIMER))
@@ -79,7 +83,11 @@ handle_tick(int unused STG_UNUSED)
   /* For threadDelay etc., see Select.c */
   ticks_since_select++;
 
-  context_switch = 1;
+  ticks_to_ctxt_switch--;
+  if (ticks_to_ctxt_switch <= 0) {
+      ticks_to_ctxt_switch = RtsFlags.ConcFlags.ctxtSwitchTicks;
+      context_switch = 1;      /* schedule a context switch */
+  }
 }
 
 
@@ -133,6 +141,7 @@ initialize_virtual_timer(nat ms)
                0,
                TIME_PERIODIC);
 # endif
+
   return 0;
 }