/* ---------------------------------------------------------------------------
- * $Id: Schedule.c,v 1.104 2001/10/31 10:34:29 simonmar Exp $
+ * $Id: Schedule.c,v 1.105 2001/11/08 12:46:31 simonmar Exp $
*
* (c) The GHC Team, 1998-2000
*
* Locks required: sched_mutex.
*/
#ifdef SMP
-//@cindex free_capabilities
-//@cindex n_free_capabilities
Capability *free_capabilities; /* Available capabilities for running threads */
nat n_free_capabilities; /* total number of available capabilities */
#else
-//@cindex MainRegTable
-Capability MainRegTable; /* for non-SMP, we have one global capability */
+Capability MainCapability; /* for non-SMP, we have one global capability */
#endif
#if defined(GRAN)
}
}
-#else
+#else // not SMP
+
# if defined(PAR)
/* in GUM do this only on the Main PE */
if (IAmMainThread)
pthread_cond_signal(&thread_ready_cond);
}
}
-#endif /* SMP */
+#endif // SMP
/* check for signals each time around the scheduler */
#ifndef mingw32_TARGET_OS
*/
ASSERT(run_queue_hd != END_TSO_QUEUE);
t = POP_RUN_QUEUE();
+
+ // Sanity check the thread we're about to run. This can be
+ // expensive if there is lots of thread switching going on...
IF_DEBUG(sanity,checkTSO(t));
#endif
free_capabilities = cap->link;
n_free_capabilities--;
#else
- cap = &MainRegTable;
+ cap = &MainCapability;
#endif
- cap->rCurrentTSO = t;
+ cap->r.rCurrentTSO = t;
/* context switches are now initiated by the timer signal, unless
* the user specified "context switch as often as possible", with
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
/* Run the current thread
*/
- switch (cap->rCurrentTSO->what_next) {
+ switch (cap->r.rCurrentTSO->what_next) {
case ThreadKilled:
case ThreadComplete:
/* Thread already finished, return to scheduler. */
ret = ThreadFinished;
break;
case ThreadEnterGHC:
- ret = StgRun((StgFunPtr) stg_enterStackTop, cap);
+ ret = StgRun((StgFunPtr) stg_enterStackTop, &cap->r);
break;
case ThreadRunGHC:
- ret = StgRun((StgFunPtr) stg_returnToStackTop, cap);
+ ret = StgRun((StgFunPtr) stg_returnToStackTop, &cap->r);
break;
case ThreadEnterInterp:
ret = interpretBCO(cap);
#elif !defined(GRAN) && !defined(PAR)
IF_DEBUG(scheduler,fprintf(stderr,"scheduler: "););
#endif
- t = cap->rCurrentTSO;
+ t = cap->r.rCurrentTSO;
#if defined(PAR)
/* HACK 675: if the last thread didn't yield, make sure to print a
switch (ret) {
case HeapOverflow:
#if defined(GRAN)
- IF_DEBUG(gran,
- DumpGranEvent(GR_DESCHEDULE, t));
+ IF_DEBUG(gran, DumpGranEvent(GR_DESCHEDULE, t));
globalGranStats.tot_heapover++;
#elif defined(PAR)
- // IF_DEBUG(par,
- //DumpGranEvent(GR_DESCHEDULE, t);
globalParStats.tot_heapover++;
#endif
+
+ // did the task ask for a large block?
+ if (cap->r.rHpAlloc > BLOCK_SIZE_W) {
+ // if so, get one and push it on the front of the nursery.
+ bdescr *bd;
+ nat blocks;
+
+ blocks = (nat)BLOCK_ROUND_UP(cap->r.rHpAlloc * sizeof(W_)) / BLOCK_SIZE;
+
+ IF_DEBUG(scheduler,belch("--<< thread %ld (%p; %s) stopped: requesting a large block (size %d)",
+ t->id, t,
+ whatNext_strs[t->what_next], blocks));
+
+ // don't do this if it would push us over the
+ // alloc_blocks_lim limit; we'll GC first.
+ if (alloc_blocks + blocks < alloc_blocks_lim) {
+
+ alloc_blocks += blocks;
+ bd = allocGroup( blocks );
+
+ // link the new group into the list
+ bd->link = cap->r.rCurrentNursery;
+ bd->u.back = cap->r.rCurrentNursery->u.back;
+ if (cap->r.rCurrentNursery->u.back != NULL) {
+ cap->r.rCurrentNursery->u.back->link = bd;
+ } else {
+ ASSERT(g0s0->blocks == cap->r.rCurrentNursery &&
+ g0s0->blocks == cap->r.rNursery);
+ cap->r.rNursery = g0s0->blocks = bd;
+ }
+ cap->r.rCurrentNursery->u.back = bd;
+
+ // initialise it as a nursery block
+ bd->step = g0s0;
+ bd->gen_no = 0;
+ bd->flags = 0;
+ bd->free = bd->start;
+
+ // don't forget to update the block count in g0s0.
+ g0s0->n_blocks += blocks;
+ ASSERT(countBlocks(g0s0->blocks) == g0s0->n_blocks);
+
+ // now update the nursery to point to the new block
+ cap->r.rCurrentNursery = bd;
+
+ // we might be unlucky and have another thread get on the
+ // run queue before us and steal the large block, but in that
+ // case the thread will just end up requesting another large
+ // block.
+ PUSH_ON_RUN_QUEUE(t);
+ break;
+ }
+ }
+
/* make all the running tasks block on a condition variable,
* maybe set context_switch and wait till they all pile in,
* then have them wait on a GC condition variable.
G_CURR_THREADQ(0));
#endif /* GRAN */
}
+
#if defined(GRAN)
next_thread:
IF_GRAN_DEBUG(unused,
print_eventq(EventHd));
event = get_next_event();
-
#elif defined(PAR)
next_thread:
/* ToDo: wait for next message to arrive rather than busy wait */
-
-#else /* GRAN */
- /* not any more
- next_thread:
- t = take_off_run_queue(END_TSO_QUEUE);
- */
#endif /* GRAN */
+
} /* end of while(1) */
+
IF_PAR_DEBUG(verbose,
belch("== Leaving schedule() after having received Finish"));
}
ACQUIRE_LOCK(&sched_mutex);
IF_DEBUG(scheduler,
- sched_belch("thread %d did a _ccall_gc", cap->rCurrentTSO->id));
+ sched_belch("thread %d did a _ccall_gc", cap->r.rCurrentTSO->id));
- threadPaused(cap->rCurrentTSO);
- cap->rCurrentTSO->link = suspended_ccalling_threads;
- suspended_ccalling_threads = cap->rCurrentTSO;
+ threadPaused(cap->r.rCurrentTSO);
+ cap->r.rCurrentTSO->link = suspended_ccalling_threads;
+ suspended_ccalling_threads = cap->r.rCurrentTSO;
/* Use the thread ID as the token; it should be unique */
- tok = cap->rCurrentTSO->id;
+ tok = cap->r.rCurrentTSO->id;
#ifdef SMP
cap->link = free_capabilities;
free_capabilities = cap->link;
n_free_capabilities--;
#else
- cap = &MainRegTable;
+ cap = &MainCapability;
#endif
- cap->rCurrentTSO = tso;
+ cap->r.rCurrentTSO = tso;
RELEASE_LOCK(&sched_mutex);
return cap;
}
#endif
-//@cindex initScheduler
+static void
+initCapability( Capability *cap )
+{
+ cap->f.stgChk0 = (F_)__stg_chk_0;
+ cap->f.stgChk1 = (F_)__stg_chk_1;
+ cap->f.stgGCEnter1 = (F_)__stg_gc_enter_1;
+ cap->f.stgUpdatePAP = (F_)__stg_update_PAP;
+}
+
void
initScheduler(void)
{
prev = NULL;
for (i = 0; i < RtsFlags.ParFlags.nNodes; i++) {
cap = stgMallocBytes(sizeof(Capability), "initScheduler:capabilities");
+ initCapability(cap);
cap->link = prev;
prev = cap;
}
}
IF_DEBUG(scheduler,fprintf(stderr,"scheduler: Allocated %d capabilities\n",
n_free_capabilities););
+#else
+ initCapability(&MainCapability);
#endif
#if defined(SMP) || defined(PAR)
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