STATIC_INLINE rtsBool
globalWorkToDo (void)
{
- return blackholes_need_checking
- || sched_state >= SCHED_INTERRUPTING
- ;
+ return sched_state >= SCHED_INTERRUPTING
+ || recent_activity == ACTIVITY_INACTIVE; // need to check for deadlock
}
#endif
initMutex(&cap->lock);
cap->running_task = NULL; // indicates cap is free
cap->spare_workers = NULL;
+ cap->n_spare_workers = 0;
cap->suspended_ccalls = NULL;
cap->returning_tasks_hd = NULL;
cap->returning_tasks_tl = NULL;
- cap->wakeup_queue_hd = END_TSO_QUEUE;
- cap->wakeup_queue_tl = END_TSO_QUEUE;
+ cap->inbox = (Message*)END_TSO_QUEUE;
cap->sparks_created = 0;
cap->sparks_converted = 0;
cap->sparks_pruned = 0;
// If we have an unbound thread on the run queue, or if there's
// anything else to do, give the Capability to a worker thread.
if (always_wakeup ||
- !emptyRunQueue(cap) || !emptyWakeupQueue(cap) ||
+ !emptyRunQueue(cap) || !emptyInbox(cap) ||
!emptySparkPoolCap(cap) || globalWorkToDo()) {
if (cap->spare_workers) {
giveCapabilityToTask(cap,cap->spare_workers);
// in which case it is not replaced on the spare_worker queue.
// This happens when the system is shutting down (see
// Schedule.c:workerStart()).
- if (!isBoundTask(task) && !task->stopped) {
- task->next = cap->spare_workers;
- cap->spare_workers = task;
+ if (!isBoundTask(task) && !task->stopped)
+ {
+ if (cap->n_spare_workers < MAX_SPARE_WORKERS)
+ {
+ task->next = cap->spare_workers;
+ cap->spare_workers = task;
+ cap->n_spare_workers++;
+ }
+ else
+ {
+ debugTrace(DEBUG_sched, "%d spare workers already, exiting",
+ cap->n_spare_workers);
+ releaseCapability_(cap,rtsFalse);
+ // hold the lock until after workerTaskStop; c.f. scheduleWorker()
+ workerTaskStop(task);
+ RELEASE_LOCK(&cap->lock);
+ shutdownThread();
+ }
}
// Bound tasks just float around attached to their TSOs.
}
cap->spare_workers = task->next;
task->next = NULL;
- }
+ cap->n_spare_workers--;
+ }
cap->running_task = task;
RELEASE_LOCK(&cap->lock);
break;
}
/* ----------------------------------------------------------------------------
- * Wake up a thread on a Capability.
- *
- * This is used when the current Task is running on a Capability and
- * wishes to wake up a thread on a different Capability.
- * ------------------------------------------------------------------------- */
-
-void
-wakeupThreadOnCapability (Capability *my_cap,
- Capability *other_cap,
- StgTSO *tso)
-{
- ACQUIRE_LOCK(&other_cap->lock);
-
- // ASSUMES: cap->lock is held (asserted in wakeupThreadOnCapability)
- if (tso->bound) {
- ASSERT(tso->bound->task->cap == tso->cap);
- tso->bound->task->cap = other_cap;
- }
- tso->cap = other_cap;
-
- ASSERT(tso->bound ? tso->bound->task->cap == other_cap : 1);
-
- if (other_cap->running_task == NULL) {
- // nobody is running this Capability, we can add our thread
- // directly onto the run queue and start up a Task to run it.
-
- other_cap->running_task = myTask();
- // precond for releaseCapability_() and appendToRunQueue()
-
- appendToRunQueue(other_cap,tso);
-
- releaseCapability_(other_cap,rtsFalse);
- } else {
- appendToWakeupQueue(my_cap,other_cap,tso);
- other_cap->context_switch = 1;
- // someone is running on this Capability, so it cannot be
- // freed without first checking the wakeup queue (see
- // releaseCapability_).
- }
-
- RELEASE_LOCK(&other_cap->lock);
-}
-
-/* ----------------------------------------------------------------------------
* prodCapability
*
* If a Capability is currently idle, wake up a Task on it. Used to
if (!osThreadIsAlive(t->id)) {
debugTrace(DEBUG_sched,
"worker thread %p has died unexpectedly", (void *)t->id);
- if (!prev) {
- cap->spare_workers = t->next;
- } else {
- prev->next = t->next;
- }
- prev = t;
+ cap->n_spare_workers--;
+ if (!prev) {
+ cap->spare_workers = t->next;
+ } else {
+ prev->next = t->next;
+ }
+ prev = t;
}
}
}
void
markSomeCapabilities (evac_fn evac, void *user, nat i0, nat delta,
- rtsBool prune_sparks USED_IF_THREADS)
+ rtsBool no_mark_sparks USED_IF_THREADS)
{
nat i;
Capability *cap;
evac(user, (StgClosure **)(void *)&cap->run_queue_hd);
evac(user, (StgClosure **)(void *)&cap->run_queue_tl);
#if defined(THREADED_RTS)
- evac(user, (StgClosure **)(void *)&cap->wakeup_queue_hd);
- evac(user, (StgClosure **)(void *)&cap->wakeup_queue_tl);
+ evac(user, (StgClosure **)(void *)&cap->inbox);
#endif
for (incall = cap->suspended_ccalls; incall != NULL;
incall=incall->next) {
}
#if defined(THREADED_RTS)
- if (prune_sparks) {
- pruneSparkQueue (evac, user, cap);
- } else {
+ if (!no_mark_sparks) {
traverseSparkQueue (evac, user, cap);
}
#endif
{
markSomeCapabilities(evac, user, 0, 1, rtsFalse);
}
+
+/* -----------------------------------------------------------------------------
+ Messages
+ -------------------------------------------------------------------------- */
+
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