[project @ 2003-12-16 13:19:01 by simonmar]

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

diff --git a/ghc/rts/Task.c b/ghc/rts/Task.c
index bf20e99..6579abc 100644 (file)
--- a/ghc/rts/Task.c
+++ b/ghc/rts/Task.c
@@ -46,7 +46,6 @@ static nat maxTasks;
 /* number of tasks currently created */
 static nat taskCount; 
 
-
 #if defined(SMP)
 void
 startTaskManager( nat maxCount, void (*taskStart)(void) )
@@ -100,6 +99,7 @@ void
 stopTaskManager ()
 {
   nat i;
+  OSThreadId tid = osThreadId();
 
   /* Don't want to use pthread_cancel, since we'd have to install
    * these silly exception handlers (pthread_cleanup_{push,pop}) around
@@ -120,9 +120,12 @@ stopTaskManager ()
 #endif
 
   /* Send 'em all a SIGHUP.  That should shut 'em up. */
-  await_death = maxCount;
+  await_death = maxCount - 1;
   for (i = 0; i < maxCount; i++) {
-    pthread_kill(taskTable[i].id,SIGTERM);
+    /* don't cancel the thread running this piece of code. */
+    if ( taskTable[i].id != tid ) {
+      pthread_kill(taskTable[i].id,SIGTERM);
+    }
   }
   while (await_death > 0) {
     sched_yield();
@@ -131,11 +134,18 @@ stopTaskManager ()
   return;
 }
 
+void
+resetTaskManagerAfterFork ()
+{
+       barf("resetTaskManagerAfterFork not implemented for SMP");
+}
+
 #else
 /************ THREADS version *****************/
 
 void
-startTaskManager( nat maxCount, void (*taskStart)(void) )
+startTaskManager( nat maxCount,
+                 void (*taskStart)(void) STG_UNUSED )
 {
   /* In the threaded case, maxCount is used to limit the
      the creation of worker tasks. Tasks are created lazily, i.e.,
@@ -152,18 +162,15 @@ startTask ( void (*taskStart)(void) )
   int r;
   OSThreadId tid;
   
-  /* Locks assumed: rts_mutex */
-  
   /* If more than one worker thread is known to be blocked waiting
-     on thread_ready_cond, signal it rather than creating a new one.
+     on thread_ready_cond, don't create a new one.
   */
   if ( rts_n_waiting_tasks > 0) {
     IF_DEBUG(scheduler,fprintf(stderr,
                               "scheduler: startTask: %d tasks waiting, not creating new one.\n", 
                               rts_n_waiting_tasks););
-    signalCondition(&thread_ready_cond);
-    /* Not needed, but gives more 'interesting' thread schedules when testing */
-    yieldThread();
+    // the task will run as soon as a capability is available,
+    // so there's no need to wake it.
     return;
   }
 
@@ -184,11 +191,20 @@ startTask ( void (*taskStart)(void) )
   return;
 }
 
+
+
 void
 stopTaskManager ()
 {
 
 }
+
+void
+resetTaskManagerAfterFork ( void )
+{
+       rts_n_waiting_tasks = 0;
+       taskCount = 0;
+}
 #endif