X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FTask.c;h=0ec60f750854cf25fbf2838a9a55ec1d8645834d;hb=2777940384ce4740954062bedd0f6813698fc72a;hp=918dc559b83a3967060cb86b24e8a6c877ab1233;hpb=5a2769f0273dd389977e8283375e7920d183bdd4;p=ghc-hetmet.git

diff --git a/rts/Task.c b/rts/Task.c
index 918dc55..0ec60f7 100644
--- a/rts/Task.c
+++ b/rts/Task.c
@@ -15,6 +15,7 @@
 #include "Capability.h"
 #include "Stats.h"
 #include "RtsFlags.h"
+#include "Storage.h"
 #include "Schedule.h"
 #include "Hash.h"
 #include "Trace.h"
@@ -28,8 +29,6 @@
 Task *all_tasks = NULL;
 static Task *task_free_list = NULL; // singly-linked
 static nat taskCount;
-#define DEFAULT_MAX_WORKERS 64
-static nat maxWorkers; // we won't create more workers than this
 static nat tasksRunning;
 static nat workerCount;
 
@@ -58,7 +57,6 @@ initTaskManager (void)
 	taskCount = 0;
 	workerCount = 0;
 	tasksRunning = 0;
-	maxWorkers = DEFAULT_MAX_WORKERS;
 	initialized = 1;
 #if defined(THREADED_RTS)
 	newThreadLocalKey(&currentTaskKey);
@@ -73,6 +71,38 @@ stopTaskManager (void)
     debugTrace(DEBUG_sched, 
 	       "stopping task manager, %d tasks still running",
 	       tasksRunning);
+    /* nothing to do */
+}
+
+
+void
+freeTaskManager (void)
+{
+    Task *task, *next;
+
+    debugTrace(DEBUG_sched, "freeing task manager");
+
+    ACQUIRE_LOCK(&sched_mutex);
+    for (task = all_tasks; task != NULL; task = next) {
+        next = task->all_link;
+        if (task->stopped) {
+            // We only free resources if the Task is not in use.  A
+            // Task may still be in use if we have a Haskell thread in
+            // a foreign call while we are attempting to shut down the
+            // RTS (see conc059).
+#if defined(THREADED_RTS)
+            closeCondition(&task->cond);
+            closeMutex(&task->lock);
+#endif
+            stgFree(task);
+        }
+    }
+    all_tasks = NULL;
+    task_free_list = NULL;
+#if defined(THREADED_RTS)
+    freeThreadLocalKey(&currentTaskKey);
+#endif
+    RELEASE_LOCK(&sched_mutex);
 }
 
 
@@ -185,7 +215,7 @@ discardTask (Task *task)
 {
     ASSERT_LOCK_HELD(&sched_mutex);
     if (!task->stopped) {
-	debugTrace(DEBUG_sched, "discarding task %p", TASK_ID(task));
+	debugTrace(DEBUG_sched, "discarding task %ld", (long)TASK_ID(task));
 	task->cap = NULL;
 	task->tso = NULL;
 	task->stopped = rtsTrue;
@@ -228,15 +258,21 @@ workerTaskStop (Task *task)
     ASSERT(myTask() == task);
 #endif
 
+    task->cap = NULL;
     taskTimeStamp(task);
     task->stopped = rtsTrue;
     tasksRunning--;
+
+    ACQUIRE_LOCK(&sched_mutex);
+    task->next = task_free_list;
+    task_free_list = task;
+    RELEASE_LOCK(&sched_mutex);
 }
 
 void
 resetTaskManagerAfterFork (void)
 {
-#warning TODO!
+    // TODO!
     taskCount = 0;
 }
 
@@ -250,9 +286,6 @@ startWorkerTask (Capability *cap,
   OSThreadId tid;
   Task *task;
 
-  if (workerCount >= maxWorkers) {
-      barf("too many workers; runaway worker creation?");
-  }
   workerCount++;
 
   // A worker always gets a fresh Task structure.
@@ -275,7 +308,8 @@ startWorkerTask (Capability *cap,
 
   r = createOSThread(&tid, (OSThreadProc *)taskStart, task);
   if (r != 0) {
-    barf("startTask: Can't create new task");
+    sysErrorBelch("failed to create OS thread");
+    stg_exit(EXIT_FAILURE);
   }
 
   debugTrace(DEBUG_sched, "new worker task (taskCount: %d)", taskCount);
@@ -312,7 +346,7 @@ printAllTasks(void)
 		debugBelch("on capability %d, ", task->cap->no);
 	    }
 	    if (task->tso) {
-		debugBelch("bound to thread %d", task->tso->id);
+	      debugBelch("bound to thread %lu", (unsigned long)task->tso->id);
 	    } else {
 		debugBelch("worker");
 	    }