/* ---------------------------------------------------------------------------
- * $Id: Schedule.c,v 1.190 2004/02/27 15:56:25 simonmar Exp $
*
- * (c) The GHC Team, 1998-2003
+ * (c) The GHC Team, 1998-2004
*
* Scheduler
*
#include "SchedAPI.h"
#include "RtsUtils.h"
#include "RtsFlags.h"
+#include "BlockAlloc.h"
#include "Storage.h"
#include "StgRun.h"
-#include "StgStartup.h"
#include "Hooks.h"
#define COMPILING_SCHEDULER
#include "Schedule.h"
#include "Signals.h"
#include "Sanity.h"
#include "Stats.h"
+#include "STM.h"
#include "Timer.h"
#include "Prelude.h"
#include "ThreadLabels.h"
+#include "LdvProfile.h"
+#include "Updates.h"
#ifdef PROFILING
#include "Proftimer.h"
#include "ProfHeap.h"
*/
/* flag set by signal handler to precipitate a context switch */
-nat context_switch = 0;
+int context_switch = 0;
/* if this flag is set as well, give up execution */
rtsBool interrupted = rtsFalse;
+/* If this flag is set, we are running Haskell code. Used to detect
+ * uses of 'foreign import unsafe' that should be 'safe'.
+ */
+rtsBool in_haskell = rtsFalse;
+
/* Next thread ID to allocate.
* Locks required: thread_id_mutex
*/
static void schedule ( StgMainThread *mainThread, Capability *initialCapability );
void interruptStgRts ( void );
+#if !defined(PAR) && !defined(RTS_SUPPORTS_THREADS)
static void detectBlackHoles ( void );
+#endif
+
+static void raiseAsync_(StgTSO *tso, StgClosure *exception, rtsBool stop_at_atomically);
#if defined(RTS_SUPPORTS_THREADS)
/* ToDo: carefully document the invariants that go together
#if DEBUG
static char *whatNext_strs[] = {
+ "(unknown)",
"ThreadRunGHC",
"ThreadInterpret",
"ThreadKilled",
taskStart(void)
{
ACQUIRE_LOCK(&sched_mutex);
+ startingWorkerThread = rtsFalse;
schedule(NULL,NULL);
RELEASE_LOCK(&sched_mutex);
}
// just because the last one hasn't yet reached the
// "waiting for capability" state
startingWorkerThread = rtsTrue;
- startTask(taskStart);
+ if(!startTask(taskStart))
+ {
+ startingWorkerThread = rtsFalse;
+ }
}
}
}
Capability *initialCapability )
{
StgTSO *t;
- Capability *cap = initialCapability;
+ Capability *cap;
StgThreadReturnCode ret;
#if defined(GRAN)
rtsEvent *event;
# endif
#endif
rtsBool was_interrupted = rtsFalse;
- StgTSOWhatNext prev_what_next;
+ nat prev_what_next;
// Pre-condition: sched_mutex is held.
-
+ // We might have a capability, passed in as initialCapability.
+ cap = initialCapability;
+
#if defined(RTS_SUPPORTS_THREADS)
//
// in the threaded case, the capability is either passed in via the
CurrentTSO, (StgClosure*)NULL, (rtsSpark*)NULL);
IF_DEBUG(gran,
- fprintf(stderr, "GRAN: Init CurrentTSO (in schedule) = %p\n", CurrentTSO);
+ debugBelch("GRAN: Init CurrentTSO (in schedule) = %p\n", CurrentTSO);
G_TSO(CurrentTSO, 5));
if (RtsFlags.GranFlags.Light) {
// We now have a capability...
#endif
+ // Check whether we have re-entered the RTS from Haskell without
+ // going via suspendThread()/resumeThread (i.e. a 'safe' foreign
+ // call).
+ if (in_haskell) {
+ errorBelch("schedule: re-entered unsafely.\n"
+ " Perhaps a 'foreign import unsafe' should be 'safe'?");
+ stg_exit(1);
+ }
+
//
// If we're interrupted (the user pressed ^C, or some other
// termination condition occurred), kill all the currently running
#if defined(RTS_SUPPORTS_THREADS)
// In the threaded RTS, deadlock detection doesn't work,
// so just exit right away.
- prog_belch("interrupted");
+ errorBelch("interrupted");
releaseCapability(cap);
RELEASE_LOCK(&sched_mutex);
shutdownHaskellAndExit(EXIT_SUCCESS);
#endif
}
- //
- // Go through the list of main threads and wake up any
- // clients whose computations have finished. ToDo: this
- // should be done more efficiently without a linear scan
- // of the main threads list, somehow...
- //
-#if defined(RTS_SUPPORTS_THREADS)
- {
- StgMainThread *m, **prev;
- prev = &main_threads;
- for (m = main_threads; m != NULL; prev = &m->link, m = m->link) {
- if (m->tso->what_next == ThreadComplete
- || m->tso->what_next == ThreadKilled)
- {
- if (m == mainThread)
- {
- if (m->tso->what_next == ThreadComplete)
- {
- if (m->ret)
- {
- // NOTE: return val is tso->sp[1] (see StgStartup.hc)
- *(m->ret) = (StgClosure *)m->tso->sp[1];
- }
- m->stat = Success;
- }
- else
- {
- if (m->ret)
- {
- *(m->ret) = NULL;
- }
- if (was_interrupted)
- {
- m->stat = Interrupted;
- }
- else
- {
- m->stat = Killed;
- }
- }
- *prev = m->link;
-
-#ifdef DEBUG
- removeThreadLabel((StgWord)m->tso->id);
-#endif
- releaseCapability(cap);
- return;
- }
- else
- {
- // The current OS thread can not handle the fact that
- // the Haskell thread "m" has ended. "m" is bound;
- // the scheduler loop in it's bound OS thread has to
- // return, so let's pass our capability directly to
- // that thread.
- passCapability(&m->bound_thread_cond);
- continue;
- }
- }
- }
- }
-
-#else /* not threaded */
-
-# if defined(PAR)
- /* in GUM do this only on the Main PE */
- if (IAmMainThread)
-# endif
- /* If our main thread has finished or been killed, return.
- */
- {
- StgMainThread *m = main_threads;
- if (m->tso->what_next == ThreadComplete
- || m->tso->what_next == ThreadKilled) {
-#ifdef DEBUG
- removeThreadLabel((StgWord)m->tso->id);
-#endif
- main_threads = main_threads->link;
- if (m->tso->what_next == ThreadComplete) {
- // We finished successfully, fill in the return value
- // NOTE: return val is tso->sp[1] (see StgStartup.hc)
- if (m->ret) { *(m->ret) = (StgClosure *)m->tso->sp[1]; };
- m->stat = Success;
- return;
- } else {
- if (m->ret) { *(m->ret) = NULL; };
- if (was_interrupted) {
- m->stat = Interrupted;
- } else {
- m->stat = Killed;
- }
- return;
- }
- }
- }
-#endif
-
-
#if defined(RTS_USER_SIGNALS)
// check for signals each time around the scheduler
if (signals_pending()) {
}
#endif
- /* Check whether any waiting threads need to be woken up. If the
- * run queue is empty, and there are no other tasks running, we
- * can wait indefinitely for something to happen.
- */
- if ( !EMPTY_QUEUE(blocked_queue_hd) || !EMPTY_QUEUE(sleeping_queue)
+ //
+ // Check whether any waiting threads need to be woken up. If the
+ // run queue is empty, and there are no other tasks running, we
+ // can wait indefinitely for something to happen.
+ //
+ if ( !EMPTY_QUEUE(blocked_queue_hd) || !EMPTY_QUEUE(sleeping_queue) )
+ {
#if defined(RTS_SUPPORTS_THREADS)
- || EMPTY_RUN_QUEUE()
+ // We shouldn't be here...
+ barf("schedule: awaitEvent() in threaded RTS");
#endif
- )
- {
- awaitEvent( EMPTY_RUN_QUEUE() );
+ awaitEvent( EMPTY_RUN_QUEUE() );
}
- /* we can be interrupted while waiting for I/O... */
+ // we can be interrupted while waiting for I/O...
if (interrupted) continue;
/*
if ( EMPTY_THREAD_QUEUES() )
{
IF_DEBUG(scheduler, sched_belch("deadlocked, forcing major GC..."));
+
// Garbage collection can release some new threads due to
// either (a) finalizers or (b) threads resurrected because
- // they are about to be send BlockedOnDeadMVar. Any threads
- // thus released will be immediately runnable.
+ // they are unreachable and will therefore be sent an
+ // exception. Any threads thus released will be immediately
+ // runnable.
GarbageCollect(GetRoots,rtsTrue);
-
- if ( !EMPTY_RUN_QUEUE() ) { goto not_deadlocked; }
-
- IF_DEBUG(scheduler,
- sched_belch("still deadlocked, checking for black holes..."));
- detectBlackHoles();
-
if ( !EMPTY_RUN_QUEUE() ) { goto not_deadlocked; }
#if defined(RTS_USER_SIGNALS)
m = main_threads;
switch (m->tso->why_blocked) {
case BlockedOnBlackHole:
- raiseAsync(m->tso, (StgClosure *)NonTermination_closure);
- break;
case BlockedOnException:
case BlockedOnMVar:
- raiseAsync(m->tso, (StgClosure *)Deadlock_closure);
+ raiseAsync(m->tso, (StgClosure *)NonTermination_closure);
break;
default:
barf("deadlock: main thread blocked in a strange way");
// ToDo: add deadlock detection in GUM (similar to SMP) -- HWL
#endif
-#if defined(RTS_SUPPORTS_THREADS)
+#if defined(RTS_SUPPORTS_THREADS) || defined(mingw32_HOST_OS)
+ /* win32: might be back here due to awaitEvent() being abandoned
+ * as a result of a console event having been delivered.
+ */
if ( EMPTY_RUN_QUEUE() ) {
- continue; // nothing to do
+ continue; // nothing to do
}
#endif
if (!RtsFlags.GranFlags.Light)
handleIdlePEs();
- IF_DEBUG(gran, fprintf(stderr, "GRAN: switch by event-type\n"));
+ IF_DEBUG(gran, debugBelch("GRAN: switch by event-type\n"));
/* main event dispatcher in GranSim */
switch (event->evttype) {
/* Should just be continuing execution */
case ContinueThread:
- IF_DEBUG(gran, fprintf(stderr, "GRAN: doing ContinueThread\n"));
+ IF_DEBUG(gran, debugBelch("GRAN: doing ContinueThread\n"));
/* ToDo: check assertion
ASSERT(run_queue_hd != (StgTSO*)NULL &&
run_queue_hd != END_TSO_QUEUE);
/* Ignore ContinueThreads for fetching threads (if synchr comm) */
if (!RtsFlags.GranFlags.DoAsyncFetch &&
procStatus[CurrentProc]==Fetching) {
- belch("ghuH: Spurious ContinueThread while Fetching ignored; TSO %d (%p) [PE %d]",
+ debugBelch("ghuH: Spurious ContinueThread while Fetching ignored; TSO %d (%p) [PE %d]\n",
CurrentTSO->id, CurrentTSO, CurrentProc);
goto next_thread;
}
/* Ignore ContinueThreads for completed threads */
if (CurrentTSO->what_next == ThreadComplete) {
- belch("ghuH: found a ContinueThread event for completed thread %d (%p) [PE %d] (ignoring ContinueThread)",
+ debugBelch("ghuH: found a ContinueThread event for completed thread %d (%p) [PE %d] (ignoring ContinueThread)\n",
CurrentTSO->id, CurrentTSO, CurrentProc);
goto next_thread;
}
/* Ignore ContinueThreads for threads that are being migrated */
if (PROCS(CurrentTSO)==Nowhere) {
- belch("ghuH: trying to run the migrating TSO %d (%p) [PE %d] (ignoring ContinueThread)",
+ debugBelch("ghuH: trying to run the migrating TSO %d (%p) [PE %d] (ignoring ContinueThread)\n",
CurrentTSO->id, CurrentTSO, CurrentProc);
goto next_thread;
}
/* The thread should be at the beginning of the run queue */
if (CurrentTSO!=run_queue_hds[CurrentProc]) {
- belch("ghuH: TSO %d (%p) [PE %d] is not at the start of the run_queue when doing a ContinueThread",
+ debugBelch("ghuH: TSO %d (%p) [PE %d] is not at the start of the run_queue when doing a ContinueThread\n",
CurrentTSO->id, CurrentTSO, CurrentProc);
break; // run the thread anyway
}
/* This point was scheduler_loop in the old RTS */
- IF_DEBUG(gran, belch("GRAN: after main switch"));
+ IF_DEBUG(gran, debugBelch("GRAN: after main switch\n"));
TimeOfLastEvent = CurrentTime[CurrentProc];
TimeOfNextEvent = get_time_of_next_event();
IgnoreEvents=(TimeOfNextEvent==0); // HWL HACK
// CurrentTSO = ThreadQueueHd;
- IF_DEBUG(gran, belch("GRAN: time of next event is: %ld",
+ IF_DEBUG(gran, debugBelch("GRAN: time of next event is: %ld\n",
TimeOfNextEvent));
if (RtsFlags.GranFlags.Light)
EndOfTimeSlice = CurrentTime[CurrentProc]+RtsFlags.GranFlags.time_slice;
IF_DEBUG(gran,
- belch("GRAN: end of time-slice is %#lx", EndOfTimeSlice));
+ debugBelch("GRAN: end of time-slice is %#lx\n", EndOfTimeSlice));
/* in a GranSim setup the TSO stays on the run queue */
t = CurrentTSO;
POP_RUN_QUEUE(t); // take_off_run_queue(t);
IF_DEBUG(gran,
- fprintf(stderr, "GRAN: About to run current thread, which is\n");
+ debugBelch("GRAN: About to run current thread, which is\n");
G_TSO(t,5));
context_switch = 0; // turned on via GranYield, checking events and time slice
if (spark != (rtsSpark) NULL) {
tso = activateSpark(spark); /* turn the spark into a thread */
IF_PAR_DEBUG(schedule,
- belch("==== schedule: Created TSO %d (%p); %d threads active",
+ debugBelch("==== schedule: Created TSO %d (%p); %d threads active\n",
tso->id, tso, advisory_thread_count));
if (tso==END_TSO_QUEUE) { /* failed to activate spark->back to loop */
- belch("==^^ failed to activate spark");
+ debugBelch("==^^ failed to activate spark\n");
goto next_thread;
} /* otherwise fall through & pick-up new tso */
} else {
IF_PAR_DEBUG(verbose,
- belch("==^^ no local sparks (spark pool contains only NFs: %d)",
+ debugBelch("==^^ no local sparks (spark pool contains only NFs: %d)\n",
spark_queue_len(pool)));
goto next_thread;
}
*/
TIME now = msTime() /*CURRENT_TIME*/;
IF_PAR_DEBUG(verbose,
- belch("-- now=%ld", now));
+ debugBelch("-- now=%ld\n", now));
IF_PAR_DEBUG(verbose,
if (outstandingFishes < RtsFlags.ParFlags.maxFishes &&
(last_fish_arrived_at!=0 &&
last_fish_arrived_at+RtsFlags.ParFlags.fishDelay > now)) {
- belch("--$$ delaying FISH until %ld (last fish %ld, delay %ld, now %ld)",
+ debugBelch("--$$ delaying FISH until %ld (last fish %ld, delay %ld, now %ld)\n",
last_fish_arrived_at+RtsFlags.ParFlags.fishDelay,
last_fish_arrived_at,
RtsFlags.ParFlags.fishDelay, now);
pool = &(MainRegTable.rSparks); // generalise to cap = &MainRegTable
IF_DEBUG(scheduler,
- belch("--=^ %d threads, %d sparks on [%#x]",
+ debugBelch("--=^ %d threads, %d sparks on [%#x]\n",
run_queue_len(), spark_queue_len(pool), CURRENT_PROC));
# if 1
#ifdef THREADED_RTS
{
- StgMainThread *m;
- for(m = main_threads; m; m = m->link)
- {
- if(m->tso == t)
- break;
- }
+ StgMainThread *m = t->main;
if(m)
{
|| blocked_queue_hd != END_TSO_QUEUE
|| sleeping_queue != END_TSO_QUEUE)))
context_switch = 1;
- else
- context_switch = 0;
run_thread:
RELEASE_LOCK(&sched_mutex);
IF_DEBUG(scheduler, sched_belch("-->> running thread %ld %s ...",
- t->id, whatNext_strs[t->what_next]));
+ (long)t->id, whatNext_strs[t->what_next]));
#ifdef PROFILING
startHeapProfTimer();
/* Run the current thread
*/
prev_what_next = t->what_next;
+
+ errno = t->saved_errno;
+ in_haskell = rtsTrue;
+
switch (prev_what_next) {
+
case ThreadKilled:
case ThreadComplete:
/* Thread already finished, return to scheduler. */
ret = ThreadFinished;
break;
+
case ThreadRunGHC:
- errno = t->saved_errno;
ret = StgRun((StgFunPtr) stg_returnToStackTop, &cap->r);
- t->saved_errno = errno;
break;
+
case ThreadInterpret:
ret = interpretBCO(cap);
break;
+
default:
barf("schedule: invalid what_next field");
}
+
+ in_haskell = rtsFalse;
+
+ // The TSO might have moved, so find the new location:
+ t = cap->r.rCurrentTSO;
+
+ // And save the current errno in this thread.
+ t->saved_errno = errno;
+
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
/* Costs for the scheduler are assigned to CCS_SYSTEM */
ACQUIRE_LOCK(&sched_mutex);
#ifdef RTS_SUPPORTS_THREADS
- IF_DEBUG(scheduler,fprintf(stderr,"sched (task %p): ", osThreadId()););
+ IF_DEBUG(scheduler,debugBelch("sched (task %p): ", osThreadId()););
#elif !defined(GRAN) && !defined(PAR)
- IF_DEBUG(scheduler,fprintf(stderr,"sched: "););
+ IF_DEBUG(scheduler,debugBelch("sched: "););
#endif
- t = cap->r.rCurrentTSO;
#if defined(PAR)
/* HACK 675: if the last thread didn't yield, make sure to print a
#endif
// did the task ask for a large block?
- if (cap->r.rHpAlloc > BLOCK_SIZE_W) {
+ if (cap->r.rHpAlloc > BLOCK_SIZE) {
// 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;
+ blocks = (nat)BLOCK_ROUND_UP(cap->r.rHpAlloc) / BLOCK_SIZE;
- IF_DEBUG(scheduler,belch("--<< thread %ld (%s) stopped: requesting a large block (size %d)",
- t->id, whatNext_strs[t->what_next], blocks));
+ IF_DEBUG(scheduler,debugBelch("--<< thread %ld (%s) stopped: requesting a large block (size %d)\n",
+ (long)t->id, 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.
* maybe set context_switch and wait till they all pile in,
* then have them wait on a GC condition variable.
*/
- IF_DEBUG(scheduler,belch("--<< thread %ld (%s) stopped: HeapOverflow",
- t->id, whatNext_strs[t->what_next]));
+ IF_DEBUG(scheduler,debugBelch("--<< thread %ld (%s) stopped: HeapOverflow\n",
+ (long)t->id, whatNext_strs[t->what_next]));
threadPaused(t);
#if defined(GRAN)
ASSERT(!is_on_queue(t,CurrentProc));
#endif
ready_to_gc = rtsTrue;
- context_switch = 1; /* stop other threads ASAP */
PUSH_ON_RUN_QUEUE(t);
/* actual GC is done at the end of the while loop */
break;
// DumpGranEvent(GR_DESCHEDULE, t);
globalParStats.tot_stackover++;
#endif
- IF_DEBUG(scheduler,belch("--<< thread %ld (%s) stopped, StackOverflow",
- t->id, whatNext_strs[t->what_next]));
+ IF_DEBUG(scheduler,debugBelch("--<< thread %ld (%s) stopped, StackOverflow\n",
+ (long)t->id, whatNext_strs[t->what_next]));
/* just adjust the stack for this thread, then pop it back
* on the run queue.
*/
threadPaused(t);
{
- StgMainThread *m;
/* enlarge the stack */
StgTSO *new_t = threadStackOverflow(t);
* main thread stack. It better not be on any other queues...
* (it shouldn't be).
*/
- for (m = main_threads; m != NULL; m = m->link) {
- if (m->tso == t) {
- m->tso = new_t;
- }
+ if (t->main != NULL) {
+ t->main->tso = new_t;
}
- threadPaused(new_t);
PUSH_ON_RUN_QUEUE(new_t);
}
break;
case ThreadYielding:
+ // Reset the context switch flag. We don't do this just before
+ // running the thread, because that would mean we would lose ticks
+ // during GC, which can lead to unfair scheduling (a thread hogs
+ // the CPU because the tick always arrives during GC). This way
+ // penalises threads that do a lot of allocation, but that seems
+ // better than the alternative.
+ context_switch = 0;
+
#if defined(GRAN)
IF_DEBUG(gran,
DumpGranEvent(GR_DESCHEDULE, t));
*/
IF_DEBUG(scheduler,
if (t->what_next != prev_what_next) {
- belch("--<< thread %ld (%s) stopped to switch evaluators",
- t->id, whatNext_strs[t->what_next]);
+ debugBelch("--<< thread %ld (%s) stopped to switch evaluators\n",
+ (long)t->id, whatNext_strs[t->what_next]);
} else {
- belch("--<< thread %ld (%s) stopped, yielding",
- t->id, whatNext_strs[t->what_next]);
+ debugBelch("--<< thread %ld (%s) stopped, yielding\n",
+ (long)t->id, whatNext_strs[t->what_next]);
}
);
IF_DEBUG(sanity,
- //belch("&& Doing sanity check on yielding TSO %ld.", t->id);
+ //debugBelch("&& Doing sanity check on yielding TSO %ld.", t->id);
checkTSO(t));
ASSERT(t->link == END_TSO_QUEUE);
ASSERT(!is_on_queue(t,CurrentProc));
IF_DEBUG(sanity,
- //belch("&& Doing sanity check on all ThreadQueues (and their TSOs).");
+ //debugBelch("&& Doing sanity check on all ThreadQueues (and their TSOs).");
checkThreadQsSanity(rtsTrue));
#endif
ContinueThread,
t, (StgClosure*)NULL, (rtsSpark*)NULL);
IF_GRAN_DEBUG(bq,
- belch("GRAN: eventq and runnableq after adding yielded thread to queue again:");
+ debugBelch("GRAN: eventq and runnableq after adding yielded thread to queue again:\n");
G_EVENTQ(0);
G_CURR_THREADQ(0));
#endif /* GRAN */
case ThreadBlocked:
#if defined(GRAN)
IF_DEBUG(scheduler,
- belch("--<< thread %ld (%p; %s) stopped, blocking on node %p [PE %d] with BQ: ",
+ debugBelch("--<< thread %ld (%p; %s) stopped, blocking on node %p [PE %d] with BQ: \n",
t->id, t, whatNext_strs[t->what_next], t->block_info.closure, (t->block_info.closure==(StgClosure*)NULL ? 99 : where_is(t->block_info.closure)));
if (t->block_info.closure!=(StgClosure*)NULL) print_bq(t->block_info.closure));
*/
#elif defined(PAR)
IF_DEBUG(scheduler,
- belch("--<< thread %ld (%p; %s) stopped, blocking on node %p with BQ: ",
+ debugBelch("--<< thread %ld (%p; %s) stopped, blocking on node %p with BQ: \n",
t->id, t, whatNext_strs[t->what_next], t->block_info.closure));
IF_PAR_DEBUG(bq,
* previously, or it's blocked on an MVar or Blackhole, in which
* case it'll be on the relevant queue already.
*/
+ ASSERT(t->why_blocked != NotBlocked);
IF_DEBUG(scheduler,
- fprintf(stderr, "--<< thread %d (%s) stopped: ",
+ debugBelch("--<< thread %d (%s) stopped: ",
t->id, whatNext_strs[t->what_next]);
printThreadBlockage(t);
- fprintf(stderr, "\n"));
- fflush(stderr);
+ debugBelch("\n"));
/* Only for dumping event to log file
ToDo: do I need this in GranSim, too?
/* We also end up here if the thread kills itself with an
* uncaught exception, see Exception.hc.
*/
- IF_DEBUG(scheduler,belch("--++ thread %d (%s) finished",
+ IF_DEBUG(scheduler,debugBelch("--++ thread %d (%s) finished\n",
t->id, whatNext_strs[t->what_next]));
#if defined(GRAN)
endThread(t, CurrentProc); // clean-up the thread
!RtsFlags.ParFlags.ParStats.Suppressed)
DumpEndEvent(CURRENT_PROC, t, rtsFalse /* not mandatory */);
#endif
+
+ //
+ // Check whether the thread that just completed was a main
+ // thread, and if so return with the result.
+ //
+ // There is an assumption here that all thread completion goes
+ // through this point; we need to make sure that if a thread
+ // ends up in the ThreadKilled state, that it stays on the run
+ // queue so it can be dealt with here.
+ //
+ if (
+#if defined(RTS_SUPPORTS_THREADS)
+ mainThread != NULL
+#else
+ mainThread->tso == t
+#endif
+ )
+ {
+ // We are a bound thread: this must be our thread that just
+ // completed.
+ ASSERT(mainThread->tso == t);
+
+ if (t->what_next == ThreadComplete) {
+ if (mainThread->ret) {
+ // NOTE: return val is tso->sp[1] (see StgStartup.hc)
+ *(mainThread->ret) = (StgClosure *)mainThread->tso->sp[1];
+ }
+ mainThread->stat = Success;
+ } else {
+ if (mainThread->ret) {
+ *(mainThread->ret) = NULL;
+ }
+ if (was_interrupted) {
+ mainThread->stat = Interrupted;
+ } else {
+ mainThread->stat = Killed;
+ }
+ }
+#ifdef DEBUG
+ removeThreadLabel((StgWord)mainThread->tso->id);
+#endif
+ if (mainThread->prev == NULL) {
+ main_threads = mainThread->link;
+ } else {
+ mainThread->prev->link = mainThread->link;
+ }
+ if (mainThread->link != NULL) {
+ mainThread->link->prev = NULL;
+ }
+ releaseCapability(cap);
+ return;
+ }
+
+#ifdef RTS_SUPPORTS_THREADS
+ ASSERT(t->main == NULL);
+#else
+ if (t->main != NULL) {
+ // Must be a main thread that is not the topmost one. Leave
+ // it on the run queue until the stack has unwound to the
+ // point where we can deal with this. Leaving it on the run
+ // queue also ensures that the garbage collector knows about
+ // this thread and its return value (it gets dropped from the
+ // all_threads list so there's no other way to find it).
+ APPEND_TO_RUN_QUEUE(t);
+ }
+#endif
break;
-
+
default:
barf("schedule: invalid thread return code %d", (int)ret);
}
#endif
if (ready_to_gc) {
+ /* Kick any transactions which are invalid back to their atomically frames.
+ * When next scheduled they will try to commit, this commit will fail and
+ * they will retry. */
+ for (t = all_threads; t != END_TSO_QUEUE; t = t -> link) {
+ if (t -> what_next != ThreadRelocated && t -> trec != NO_TREC && t -> why_blocked == NotBlocked) {
+ if (!stmValidateTransaction (t -> trec)) {
+ IF_DEBUG(stm, sched_belch("trec %p found wasting its time", t));
+
+ // strip the stack back to the ATOMICALLY_FRAME, aborting
+ // the (nested) transaction, and saving the stack of any
+ // partially-evaluated thunks on the heap.
+ raiseAsync_(t, NULL, rtsTrue);
+
+#ifdef REG_R1
+ ASSERT(get_itbl((StgClosure *)t->sp)->type == ATOMICALLY_FRAME);
+#endif
+ }
+ }
+ }
+
/* everybody back, start the GC.
* Could do it in this thread, or signal a condition var
* to do it in another thread. Either way, we need to
ContinueThread,
t, (StgClosure*)NULL, (rtsSpark*)NULL);
IF_GRAN_DEBUG(bq,
- fprintf(stderr, "GRAN: eventq and runnableq after Garbage collection:\n");
+ debugBelch("GRAN: eventq and runnableq after Garbage collection:\n\n");
G_EVENTQ(0);
G_CURR_THREADQ(0));
#endif /* GRAN */
} /* end of while(1) */
IF_PAR_DEBUG(verbose,
- belch("== Leaving schedule() after having received Finish"));
+ debugBelch("== Leaving schedule() after having received Finish\n"));
}
/* ---------------------------------------------------------------------------
isThreadBound(StgTSO* tso USED_IN_THREADED_RTS)
{
#ifdef THREADED_RTS
- StgMainThread *m;
- for(m = main_threads; m; m = m->link)
- {
- if(m->tso == tso)
- return rtsTrue;
- }
+ return (tso->main != NULL);
#endif
return rtsFalse;
}
* Singleton fork(). Do not copy any running threads.
* ------------------------------------------------------------------------- */
+#ifndef mingw32_HOST_OS
+#define FORKPROCESS_PRIMOP_SUPPORTED
+#endif
+
+#ifdef FORKPROCESS_PRIMOP_SUPPORTED
static void
deleteThreadImmediately(StgTSO *tso);
-
+#endif
StgInt
-forkProcess(HsStablePtr *entry)
+forkProcess(HsStablePtr *entry
+#ifndef FORKPROCESS_PRIMOP_SUPPORTED
+ STG_UNUSED
+#endif
+ )
{
-#ifndef mingw32_TARGET_OS
+#ifdef FORKPROCESS_PRIMOP_SUPPORTED
pid_t pid;
StgTSO* t,*next;
StgMainThread *m;
// wipe the main thread list
while((m = main_threads) != NULL) {
main_threads = m->link;
-#ifdef THREADED_RTS
+# ifdef THREADED_RTS
closeCondition(&m->bound_thread_cond);
-#endif
+# endif
stgFree(m);
}
-#ifdef RTS_SUPPORTS_THREADS
- resetTaskManagerAfterFork(); // tell startTask() and friends that
- startingWorkerThread = rtsFalse; // we have no worker threads any more
- resetWorkerWakeupPipeAfterFork();
-#endif
-
rc = rts_evalStableIO(entry, NULL); // run the action
rts_checkSchedStatus("forkProcess",rc);
hs_exit(); // clean up and exit
stg_exit(0);
}
-#else /* mingw32 */
- barf("forkProcess#: primop not implemented for mingw32, sorry!\n");
+#else /* !FORKPROCESS_PRIMOP_SUPPORTED */
+ barf("forkProcess#: primop not supported, sorry!\n");
return -1;
-#endif /* mingw32 */
+#endif
}
/* ---------------------------------------------------------------------------
next = t->global_link;
deleteThread(t);
}
- run_queue_hd = run_queue_tl = END_TSO_QUEUE;
- blocked_queue_hd = blocked_queue_tl = END_TSO_QUEUE;
- sleeping_queue = END_TSO_QUEUE;
+
+ // The run queue now contains a bunch of ThreadKilled threads. We
+ // must not throw these away: the main thread(s) will be in there
+ // somewhere, and the main scheduler loop has to deal with it.
+ // Also, the run queue is the only thing keeping these threads from
+ // being GC'd, and we don't want the "main thread has been GC'd" panic.
+
+ ASSERT(blocked_queue_hd == END_TSO_QUEUE);
+ ASSERT(sleeping_queue == END_TSO_QUEUE);
}
/* startThread and insertThread are now in GranSim.c -- HWL */
* ------------------------------------------------------------------------- */
StgInt
-suspendThread( StgRegTable *reg,
- rtsBool concCall
-#if !defined(DEBUG)
- STG_UNUSED
-#endif
- )
+suspendThread( StgRegTable *reg )
{
nat tok;
Capability *cap;
ACQUIRE_LOCK(&sched_mutex);
IF_DEBUG(scheduler,
- sched_belch("thread %d did a _ccall_gc (is_concurrent: %d)", cap->r.rCurrentTSO->id,concCall));
+ sched_belch("thread %d did a _ccall_gc", cap->r.rCurrentTSO->id));
// XXX this might not be necessary --SDM
cap->r.rCurrentTSO->what_next = ThreadRunGHC;
cap->r.rCurrentTSO->link = suspended_ccalling_threads;
suspended_ccalling_threads = cap->r.rCurrentTSO;
-#if defined(RTS_SUPPORTS_THREADS)
- if(cap->r.rCurrentTSO->blocked_exceptions == NULL)
- {
+ if(cap->r.rCurrentTSO->blocked_exceptions == NULL) {
cap->r.rCurrentTSO->why_blocked = BlockedOnCCall;
cap->r.rCurrentTSO->blocked_exceptions = END_TSO_QUEUE;
- }
- else
- {
+ } else {
cap->r.rCurrentTSO->why_blocked = BlockedOnCCall_NoUnblockExc;
}
-#endif
/* Use the thread ID as the token; it should be unique */
tok = cap->r.rCurrentTSO->id;
IF_DEBUG(scheduler, sched_belch("worker (token %d): leaving RTS", tok));
#endif
- /* Other threads _might_ be available for execution; signal this */
- THREAD_RUNNABLE();
+ in_haskell = rtsFalse;
RELEASE_LOCK(&sched_mutex);
errno = saved_errno;
}
StgRegTable *
-resumeThread( StgInt tok,
- rtsBool concCall STG_UNUSED )
+resumeThread( StgInt tok )
{
StgTSO *tso, **prev;
Capability *cap;
}
tso->link = END_TSO_QUEUE;
-#if defined(RTS_SUPPORTS_THREADS)
- if(tso->why_blocked == BlockedOnCCall)
- {
+ if(tso->why_blocked == BlockedOnCCall) {
awakenBlockedQueueNoLock(tso->blocked_exceptions);
tso->blocked_exceptions = NULL;
}
-#endif
/* Reset blocking status */
tso->why_blocked = NotBlocked;
cap->r.rCurrentTSO = tso;
+ in_haskell = rtsTrue;
RELEASE_LOCK(&sched_mutex);
errno = saved_errno;
return &cap->r;
/* check that no more than RtsFlags.ParFlags.maxThreads threads are created */
if (advisory_thread_count >= RtsFlags.ParFlags.maxThreads) {
threadsIgnored++;
- belch("{createThread}Daq ghuH: refusing to create another thread; no more than %d threads allowed (currently %d)",
+ debugBelch("{createThread}Daq ghuH: refusing to create another thread; no more than %d threads allowed (currently %d)\n",
RtsFlags.ParFlags.maxThreads, advisory_thread_count);
return END_TSO_QUEUE;
}
tso->blocked_exceptions = NULL;
tso->saved_errno = 0;
+ tso->main = NULL;
tso->stack_size = stack_size;
tso->max_stack_size = round_to_mblocks(RtsFlags.GcFlags.maxStkSize)
- TSO_STRUCT_SIZEW;
tso->sp = (P_)&(tso->stack) + stack_size;
+ tso->trec = NO_TREC;
+
#ifdef PROFILING
tso->prof.CCCS = CCS_MAIN;
#endif
/* put a stop frame on the stack */
tso->sp -= sizeofW(StgStopFrame);
SET_HDR((StgClosure*)tso->sp,(StgInfoTable *)&stg_stop_thread_info,CCS_SYSTEM);
+ tso->link = END_TSO_QUEUE;
+
// ToDo: check this
#if defined(GRAN)
- tso->link = END_TSO_QUEUE;
/* uses more flexible routine in GranSim */
insertThread(tso, CurrentProc);
#else
// collect parallel global statistics (currently done together with GC stats)
if (RtsFlags.ParFlags.ParStats.Global &&
RtsFlags.GcFlags.giveStats > NO_GC_STATS) {
- //fprintf(stderr, "Creating thread %d @ %11.2f\n", tso->id, usertime());
+ //debugBelch("Creating thread %d @ %11.2f\n", tso->id, usertime());
globalParStats.tot_threads_created++;
}
#endif
#if defined(GRAN)
IF_GRAN_DEBUG(pri,
- belch("==__ schedule: Created TSO %d (%p);",
+ sched_belch("==__ schedule: Created TSO %d (%p);",
CurrentProc, tso, tso->id));
#elif defined(PAR)
IF_PAR_DEBUG(verbose,
- belch("==__ schedule: Created TSO %d (%p); %d threads active",
- tso->id, tso, advisory_thread_count));
+ sched_belch("==__ schedule: Created TSO %d (%p); %d threads active",
+ (long)tso->id, tso, advisory_thread_count));
#else
IF_DEBUG(scheduler,sched_belch("created thread %ld, stack size = %lx words",
- tso->id, tso->stack_size));
+ (long)tso->id, (long)tso->stack_size));
#endif
return tso;
}
if (RtsFlags.ParFlags.ParStats.Full) {
//ASSERT(run_queue_hd == END_TSO_QUEUE); // I think ...
IF_PAR_DEBUG(verbose,
- belch("==^^ activateSpark: turning spark of closure %p (%s) into a thread",
+ debugBelch("==^^ activateSpark: turning spark of closure %p (%s) into a thread\n",
(StgClosure *)spark, info_type((StgClosure *)spark)));
}
// ToDo: fwd info on local/global spark to thread -- HWL
void
scheduleThread_(StgTSO *tso)
{
- // Precondition: sched_mutex must be held.
- PUSH_ON_RUN_QUEUE(tso);
- THREAD_RUNNABLE();
+ // The thread goes at the *end* of the run-queue, to avoid possible
+ // starvation of any threads already on the queue.
+ APPEND_TO_RUN_QUEUE(tso);
+ threadRunnable();
}
void
}
#if defined(RTS_SUPPORTS_THREADS)
-static Condition *bound_cond_cache = NULL;
+static Condition bound_cond_cache;
+static int bound_cond_cache_full = 0;
#endif
+
SchedulerStatus
scheduleWaitThread(StgTSO* tso, /*[out]*/HaskellObj* ret,
Capability *initialCapability)
m = stgMallocBytes(sizeof(StgMainThread), "waitThread");
m->tso = tso;
+ tso->main = m;
m->ret = ret;
m->stat = NoStatus;
+ m->link = main_threads;
+ m->prev = NULL;
+ if (main_threads != NULL) {
+ main_threads->prev = m;
+ }
+ main_threads = m;
+
#if defined(RTS_SUPPORTS_THREADS)
// Allocating a new condition for each thread is expensive, so we
// cache one. This is a pretty feeble hack, but it helps speed up
// consecutive call-ins quite a bit.
- if (bound_cond_cache != NULL) {
- m->bound_thread_cond = *bound_cond_cache;
- bound_cond_cache = NULL;
+ if (bound_cond_cache_full) {
+ m->bound_thread_cond = bound_cond_cache;
+ bound_cond_cache_full = 0;
} else {
initCondition(&m->bound_thread_cond);
}
*/
IF_DEBUG(scheduler, sched_belch("waiting for thread (%d)", tso->id));
- m->link = main_threads;
- main_threads = m;
-
- PUSH_ON_RUN_QUEUE(tso);
- // NB. Don't call THREAD_RUNNABLE() here, because the thread is
+ APPEND_TO_RUN_QUEUE(tso);
+ // NB. Don't call threadRunnable() here, because the thread is
// bound and only runnable by *this* OS thread, so waking up other
// workers will just slow things down.
#endif
RELEASE_LOCK(&sched_mutex);
-
}
void
#if defined(RTS_SUPPORTS_THREADS)
// Free the condition variable, returning it to the cache if possible.
- if (bound_cond_cache == NULL) {
- *bound_cond_cache = m->bound_thread_cond;
+ if (!bound_cond_cache_full) {
+ bound_cond_cache = m->bound_thread_cond;
+ bound_cond_cache_full = 1;
} else {
closeCondition(&m->bound_thread_cond);
}
// mark the signal handlers (signals should be already blocked)
markSignalHandlers(evac);
#endif
-
- // main threads which have completed need to be retained until they
- // are dealt with in the main scheduler loop. They won't be
- // retained any other way: the GC will drop them from the
- // all_threads list, so we have to be careful to treat them as roots
- // here.
- {
- StgMainThread *m;
- for (m = main_threads; m != NULL; m = m->link) {
- switch (m->tso->what_next) {
- case ThreadComplete:
- case ThreadKilled:
- evac((StgClosure **)&m->tso);
- break;
- default:
- break;
- }
- }
- }
}
/* -----------------------------------------------------------------------------
if (tso->stack_size >= tso->max_stack_size) {
IF_DEBUG(gc,
- belch("@@ threadStackOverflow of TSO %d (%p): stack too large (now %ld; max is %ld)",
- tso->id, tso, tso->stack_size, tso->max_stack_size);
+ debugBelch("@@ threadStackOverflow of TSO %ld (%p): stack too large (now %ld; max is %ld)\n",
+ (long)tso->id, tso, (long)tso->stack_size, (long)tso->max_stack_size);
/* If we're debugging, just print out the top of the stack */
printStackChunk(tso->sp, stg_min(tso->stack+tso->stack_size,
tso->sp+64)));
new_tso_size = round_to_mblocks(new_tso_size); /* Be MBLOCK-friendly */
new_stack_size = new_tso_size - TSO_STRUCT_SIZEW;
- IF_DEBUG(scheduler, fprintf(stderr,"== sched: increasing stack size from %d words to %d.\n", tso->stack_size, new_stack_size));
+ IF_DEBUG(scheduler, debugBelch("== sched: increasing stack size from %d words to %d.\n", tso->stack_size, new_stack_size));
dest = (StgTSO *)allocate(new_tso_size);
TICK_ALLOC_TSO(new_stack_size,0);
tso->link = dest;
tso->sp = (P_)&(tso->stack[tso->stack_size]);
tso->why_blocked = NotBlocked;
- dest->mut_link = NULL;
IF_PAR_DEBUG(verbose,
- belch("@@ threadStackOverflow of TSO %d (now at %p): stack size increased to %ld",
+ debugBelch("@@ threadStackOverflow of TSO %d (now at %p): stack size increased to %ld\n",
tso->id, tso, tso->stack_size);
/* If we're debugging, just print out the top of the stack */
printStackChunk(tso->sp, stg_min(tso->stack+tso->stack_size,
}
/* the thread-queue-overhead is accounted for in either Resume or UnblockThread */
IF_GRAN_DEBUG(bq,
- fprintf(stderr," %s TSO %d (%p) [PE %d] (block_info.closure=%p) (next=%p) ,",
+ debugBelch(" %s TSO %d (%p) [PE %d] (block_info.closure=%p) (next=%p) ,",
(node_loc==tso_loc ? "Local" : "Global"),
tso->id, tso, CurrentProc, tso->block_info.closure, tso->link));
tso->block_info.closure = NULL;
- IF_DEBUG(scheduler,belch("-- Waking up thread %ld (%p)",
+ IF_DEBUG(scheduler,debugBelch("-- Waking up thread %ld (%p)\n",
tso->id, tso));
}
#elif defined(PAR)
ASSERT(((StgTSO *)bqe)->why_blocked != NotBlocked);
/* if it's a TSO just push it onto the run_queue */
next = bqe->link;
- // ((StgTSO *)bqe)->link = END_TSO_QUEUE; // debugging?
- PUSH_ON_RUN_QUEUE((StgTSO *)bqe);
- THREAD_RUNNABLE();
+ ((StgTSO *)bqe)->link = END_TSO_QUEUE; // debugging?
+ APPEND_TO_RUN_QUEUE((StgTSO *)bqe);
+ threadRunnable();
unblockCount(bqe, node);
/* reset blocking status after dumping event */
((StgTSO *)bqe)->why_blocked = NotBlocked;
(StgClosure *)bqe);
# endif
}
- IF_PAR_DEBUG(bq, fprintf(stderr, ", %p (%s)", bqe, info_type((StgClosure*)bqe)));
+ IF_PAR_DEBUG(bq, debugBelch(", %p (%s)\n", bqe, info_type((StgClosure*)bqe)));
return next;
}
ASSERT(tso->why_blocked != NotBlocked);
tso->why_blocked = NotBlocked;
next = tso->link;
- PUSH_ON_RUN_QUEUE(tso);
- THREAD_RUNNABLE();
- IF_DEBUG(scheduler,sched_belch("waking up thread %ld", tso->id));
+ tso->link = END_TSO_QUEUE;
+ APPEND_TO_RUN_QUEUE(tso);
+ threadRunnable();
+ IF_DEBUG(scheduler,sched_belch("waking up thread %ld", (long)tso->id));
return next;
}
#endif
nat len = 0;
IF_GRAN_DEBUG(bq,
- belch("##-_ AwBQ for node %p on PE %d @ %ld by TSO %d (%p): ", \
+ debugBelch("##-_ AwBQ for node %p on PE %d @ %ld by TSO %d (%p): \n", \
node, CurrentProc, CurrentTime[CurrentProc],
CurrentTSO->id, CurrentTSO));
*/
if (CurrentProc!=node_loc) {
IF_GRAN_DEBUG(bq,
- belch("## node %p is on PE %d but CurrentProc is %d (TSO %d); assuming fake fetch and adjusting bitmask (old: %#x)",
+ debugBelch("## node %p is on PE %d but CurrentProc is %d (TSO %d); assuming fake fetch and adjusting bitmask (old: %#x)\n",
node, node_loc, CurrentProc, CurrentTSO->id,
// CurrentTSO, where_is(CurrentTSO),
node->header.gran.procs));
node->header.gran.procs = (node->header.gran.procs) | PE_NUMBER(CurrentProc);
IF_GRAN_DEBUG(bq,
- belch("## new bitmask of node %p is %#x",
+ debugBelch("## new bitmask of node %p is %#x\n",
node, node->header.gran.procs));
if (RtsFlags.GranFlags.GranSimStats.Global) {
globalGranStats.tot_fake_fetches++;
((StgRBH *)node)->mut_link = (StgMutClosure *)((StgRBHSave *)bqe)->payload[1];
IF_GRAN_DEBUG(bq,
- belch("## Filled in RBH_Save for %p (%s) at end of AwBQ",
+ debugBelch("## Filled in RBH_Save for %p (%s) at end of AwBQ\n",
node, info_type(node)));
}
globalGranStats.tot_awbq++; // total no. of bqs awakened
}
IF_GRAN_DEBUG(bq,
- fprintf(stderr,"## BQ Stats of %p: [%d entries] %s\n",
+ debugBelch("## BQ Stats of %p: [%d entries] %s\n",
node, len, (bqe!=END_BQ_QUEUE) ? "RBH" : ""));
}
#elif defined(PAR)
ACQUIRE_LOCK(&sched_mutex);
IF_PAR_DEBUG(verbose,
- belch("##-_ AwBQ for node %p on [%x]: ",
+ debugBelch("##-_ AwBQ for node %p on [%x]: \n",
node, mytid));
#ifdef DIST
//RFP
if(get_itbl(q)->type == CONSTR || q==END_BQ_QUEUE) {
- IF_PAR_DEBUG(verbose, belch("## ... nothing to unblock so lets just return. RFP (BUG?)"));
+ IF_PAR_DEBUG(verbose, debugBelch("## ... nothing to unblock so lets just return. RFP (BUG?)\n"));
return;
}
#endif
#else /* !GRAN && !PAR */
-#ifdef RTS_SUPPORTS_THREADS
void
awakenBlockedQueueNoLock(StgTSO *tso)
{
tso = unblockOneLocked(tso);
}
}
-#endif
void
awakenBlockedQueue(StgTSO *tso)
{
interrupted = 1;
context_switch = 1;
-#ifdef RTS_SUPPORTS_THREADS
- wakeBlockedWorkerThread();
-#endif
}
/* -----------------------------------------------------------------------------
case NotBlocked:
return; /* not blocked */
+ case BlockedOnSTM:
+ // Be careful: nothing to do here! We tell the scheduler that the thread
+ // is runnable and we leave it to the stack-walking code to abort the
+ // transaction while unwinding the stack. We should perhaps have a debugging
+ // test to make sure that this really happens and that the 'zombie' transaction
+ // does not get committed.
+ goto done;
+
case BlockedOnMVar:
ASSERT(get_itbl(tso->block_info.closure)->type == MVAR);
{
case BlockedOnRead:
case BlockedOnWrite:
-#if defined(mingw32_TARGET_OS)
+#if defined(mingw32_HOST_OS)
case BlockedOnDoProc:
#endif
{
switch (tso->why_blocked) {
+ case BlockedOnSTM:
+ // Be careful: nothing to do here! We tell the scheduler that the thread
+ // is runnable and we leave it to the stack-walking code to abort the
+ // transaction while unwinding the stack. We should perhaps have a debugging
+ // test to make sure that this really happens and that the 'zombie' transaction
+ // does not get committed.
+ goto done;
+
case BlockedOnMVar:
ASSERT(get_itbl(tso->block_info.closure)->type == MVAR);
{
case BlockedOnRead:
case BlockedOnWrite:
-#if defined(mingw32_TARGET_OS)
+#if defined(mingw32_HOST_OS)
case BlockedOnDoProc:
#endif
{
tso->link = END_TSO_QUEUE;
tso->why_blocked = NotBlocked;
tso->block_info.closure = NULL;
- PUSH_ON_RUN_QUEUE(tso);
+ APPEND_TO_RUN_QUEUE(tso);
}
#endif
void
deleteThread(StgTSO *tso)
{
- raiseAsync(tso,NULL);
+ if (tso->why_blocked != BlockedOnCCall &&
+ tso->why_blocked != BlockedOnCCall_NoUnblockExc) {
+ raiseAsync(tso,NULL);
+ }
}
+#ifdef FORKPROCESS_PRIMOP_SUPPORTED
static void
deleteThreadImmediately(StgTSO *tso)
{ // for forkProcess only:
if (tso->what_next == ThreadComplete || tso->what_next == ThreadKilled) {
return;
}
-#if defined(RTS_SUPPORTS_THREADS)
- if (tso->why_blocked != BlockedOnCCall
- && tso->why_blocked != BlockedOnCCall_NoUnblockExc)
-#endif
+
+ if (tso->why_blocked != BlockedOnCCall &&
+ tso->why_blocked != BlockedOnCCall_NoUnblockExc) {
unblockThread(tso);
+ }
+
tso->what_next = ThreadKilled;
}
+#endif
void
raiseAsyncWithLock(StgTSO *tso, StgClosure *exception)
void
raiseAsync(StgTSO *tso, StgClosure *exception)
{
+ raiseAsync_(tso, exception, rtsFalse);
+}
+
+static void
+raiseAsync_(StgTSO *tso, StgClosure *exception, rtsBool stop_at_atomically)
+{
StgRetInfoTable *info;
StgPtr sp;
}
IF_DEBUG(scheduler,
- sched_belch("raising exception in thread %ld.", tso->id));
+ sched_belch("raising exception in thread %ld.", (long)tso->id));
// Remove it from any blocking queues
unblockThread(tso);
// top of the stack applied to the exception.
//
// 5. If it's a STOP_FRAME, then kill the thread.
+ //
+ // NB: if we pass an ATOMICALLY_FRAME then abort the associated
+ // transaction
+
StgPtr frame;
while (info->i.type != UPDATE_FRAME
&& (info->i.type != CATCH_FRAME || exception == NULL)
- && info->i.type != STOP_FRAME) {
+ && info->i.type != STOP_FRAME
+ && (info->i.type != ATOMICALLY_FRAME || stop_at_atomically == rtsFalse))
+ {
+ if (info->i.type == CATCH_RETRY_FRAME || info->i.type == ATOMICALLY_FRAME) {
+ // IF we find an ATOMICALLY_FRAME then we abort the
+ // current transaction and propagate the exception. In
+ // this case (unlike ordinary exceptions) we do not care
+ // whether the transaction is valid or not because its
+ // possible validity cannot have caused the exception
+ // and will not be visible after the abort.
+ IF_DEBUG(stm,
+ debugBelch("Found atomically block delivering async exception\n"));
+ stmAbortTransaction(tso -> trec);
+ tso -> trec = stmGetEnclosingTRec(tso -> trec);
+ }
frame += stack_frame_sizeW((StgClosure *)frame);
info = get_ret_itbl((StgClosure *)frame);
}
switch (info->i.type) {
+ case ATOMICALLY_FRAME:
+ ASSERT(stop_at_atomically);
+ ASSERT(stmGetEnclosingTRec(tso->trec) == NO_TREC);
+ stmCondemnTransaction(tso -> trec);
+#ifdef REG_R1
+ tso->sp = frame;
+#else
+ // R1 is not a register: the return convention for IO in
+ // this case puts the return value on the stack, so we
+ // need to set up the stack to return to the atomically
+ // frame properly...
+ tso->sp = frame - 2;
+ tso->sp[1] = (StgWord) &stg_NO_FINALIZER_closure; // why not?
+ tso->sp[0] = (StgWord) &stg_ut_1_0_unreg_info;
+#endif
+ tso->what_next = ThreadRunGHC;
+ return;
+
case CATCH_FRAME:
// If we find a CATCH_FRAME, and we've got an exception to raise,
// then build the THUNK raise(exception), and leave it on
TICK_ALLOC_UP_THK(words+1,0);
IF_DEBUG(scheduler,
- fprintf(stderr, "sched: Updating ");
+ debugBelch("sched: Updating ");
printPtr((P_)((StgUpdateFrame *)frame)->updatee);
- fprintf(stderr, " with ");
+ debugBelch(" with ");
printObj((StgClosure *)ap);
);
//
if (!closure_IND(((StgUpdateFrame *)frame)->updatee)) {
// revert the black hole
- UPD_IND_NOLOCK(((StgUpdateFrame *)frame)->updatee,ap);
+ UPD_IND_NOLOCK(((StgUpdateFrame *)frame)->updatee,
+ (StgClosure *)ap);
}
sp += sizeofW(StgUpdateFrame) - 1;
sp[0] = (W_)ap; // push onto stack
}
/* -----------------------------------------------------------------------------
+ raiseExceptionHelper
+
+ This function is called by the raise# primitve, just so that we can
+ move some of the tricky bits of raising an exception from C-- into
+ C. Who knows, it might be a useful re-useable thing here too.
+ -------------------------------------------------------------------------- */
+
+StgWord
+raiseExceptionHelper (StgTSO *tso, StgClosure *exception)
+{
+ StgClosure *raise_closure = NULL;
+ StgPtr p, next;
+ StgRetInfoTable *info;
+ //
+ // This closure represents the expression 'raise# E' where E
+ // is the exception raise. It is used to overwrite all the
+ // thunks which are currently under evaluataion.
+ //
+
+ //
+ // LDV profiling: stg_raise_info has THUNK as its closure
+ // type. Since a THUNK takes at least MIN_UPD_SIZE words in its
+ // payload, MIN_UPD_SIZE is more approprate than 1. It seems that
+ // 1 does not cause any problem unless profiling is performed.
+ // However, when LDV profiling goes on, we need to linearly scan
+ // small object pool, where raise_closure is stored, so we should
+ // use MIN_UPD_SIZE.
+ //
+ // raise_closure = (StgClosure *)RET_STGCALL1(P_,allocate,
+ // sizeofW(StgClosure)+1);
+ //
+
+ //
+ // Walk up the stack, looking for the catch frame. On the way,
+ // we update any closures pointed to from update frames with the
+ // raise closure that we just built.
+ //
+ p = tso->sp;
+ while(1) {
+ info = get_ret_itbl((StgClosure *)p);
+ next = p + stack_frame_sizeW((StgClosure *)p);
+ switch (info->i.type) {
+
+ case UPDATE_FRAME:
+ // Only create raise_closure if we need to.
+ if (raise_closure == NULL) {
+ raise_closure =
+ (StgClosure *)allocate(sizeofW(StgClosure)+MIN_UPD_SIZE);
+ SET_HDR(raise_closure, &stg_raise_info, CCCS);
+ raise_closure->payload[0] = exception;
+ }
+ UPD_IND(((StgUpdateFrame *)p)->updatee,raise_closure);
+ p = next;
+ continue;
+
+ case ATOMICALLY_FRAME:
+ IF_DEBUG(stm, debugBelch("Found ATOMICALLY_FRAME at %p\n", p));
+ tso->sp = p;
+ return ATOMICALLY_FRAME;
+
+ case CATCH_FRAME:
+ tso->sp = p;
+ return CATCH_FRAME;
+
+ case CATCH_STM_FRAME:
+ IF_DEBUG(stm, debugBelch("Found CATCH_STM_FRAME at %p\n", p));
+ tso->sp = p;
+ return CATCH_STM_FRAME;
+
+ case STOP_FRAME:
+ tso->sp = p;
+ return STOP_FRAME;
+
+ case CATCH_RETRY_FRAME:
+ default:
+ p = next;
+ continue;
+ }
+ }
+}
+
+
+/* -----------------------------------------------------------------------------
+ findRetryFrameHelper
+
+ This function is called by the retry# primitive. It traverses the stack
+ leaving tso->sp referring to the frame which should handle the retry.
+
+ This should either be a CATCH_RETRY_FRAME (if the retry# is within an orElse#)
+ or should be a ATOMICALLY_FRAME (if the retry# reaches the top level).
+
+ We skip CATCH_STM_FRAMEs because retries are not considered to be exceptions,
+ despite the similar implementation.
+
+ We should not expect to see CATCH_FRAME or STOP_FRAME because those should
+ not be created within memory transactions.
+ -------------------------------------------------------------------------- */
+
+StgWord
+findRetryFrameHelper (StgTSO *tso)
+{
+ StgPtr p, next;
+ StgRetInfoTable *info;
+
+ p = tso -> sp;
+ while (1) {
+ info = get_ret_itbl((StgClosure *)p);
+ next = p + stack_frame_sizeW((StgClosure *)p);
+ switch (info->i.type) {
+
+ case ATOMICALLY_FRAME:
+ IF_DEBUG(stm, debugBelch("Found ATOMICALLY_FRAME at %p during retrry\n", p));
+ tso->sp = p;
+ return ATOMICALLY_FRAME;
+
+ case CATCH_RETRY_FRAME:
+ IF_DEBUG(stm, debugBelch("Found CATCH_RETRY_FRAME at %p during retrry\n", p));
+ tso->sp = p;
+ return CATCH_RETRY_FRAME;
+
+ case CATCH_STM_FRAME:
+ default:
+ ASSERT(info->i.type != CATCH_FRAME);
+ ASSERT(info->i.type != STOP_FRAME);
+ p = next;
+ continue;
+ }
+ }
+}
+
+/* -----------------------------------------------------------------------------
resurrectThreads is called after garbage collection on the list of
threads found to be garbage. Each of these threads will be woken
up and sent a signal: BlockedOnDeadMVar if the thread was blocked
case BlockedOnBlackHole:
raiseAsync(tso,(StgClosure *)NonTermination_closure);
break;
+ case BlockedOnSTM:
+ raiseAsync(tso,(StgClosure *)BlockedIndefinitely_closure);
+ break;
case NotBlocked:
/* This might happen if the thread was blocked on a black hole
* belonging to a thread that we've just woken up (raiseAsync
}
}
-/* -----------------------------------------------------------------------------
- * Blackhole detection: if we reach a deadlock, test whether any
- * threads are blocked on themselves. Any threads which are found to
- * be self-blocked get sent a NonTermination exception.
- *
- * This is only done in a deadlock situation in order to avoid
- * performance overhead in the normal case.
- *
- * Locks: sched_mutex is held upon entry and exit.
- * -------------------------------------------------------------------------- */
-
-static void
-detectBlackHoles( void )
-{
- StgTSO *tso = all_threads;
- StgClosure *frame;
- StgClosure *blocked_on;
- StgRetInfoTable *info;
-
- for (tso = all_threads; tso != END_TSO_QUEUE; tso = tso->global_link) {
-
- while (tso->what_next == ThreadRelocated) {
- tso = tso->link;
- ASSERT(get_itbl(tso)->type == TSO);
- }
-
- if (tso->why_blocked != BlockedOnBlackHole) {
- continue;
- }
- blocked_on = tso->block_info.closure;
-
- frame = (StgClosure *)tso->sp;
-
- while(1) {
- info = get_ret_itbl(frame);
- switch (info->i.type) {
- case UPDATE_FRAME:
- if (((StgUpdateFrame *)frame)->updatee == blocked_on) {
- /* We are blocking on one of our own computations, so
- * send this thread the NonTermination exception.
- */
- IF_DEBUG(scheduler,
- sched_belch("thread %d is blocked on itself", tso->id));
- raiseAsync(tso, (StgClosure *)NonTermination_closure);
- goto done;
- }
-
- frame = (StgClosure *) ((StgUpdateFrame *)frame + 1);
- continue;
-
- case STOP_FRAME:
- goto done;
-
- // normal stack frames; do nothing except advance the pointer
- default:
- (StgPtr)frame += stack_frame_sizeW(frame);
- }
- }
- done: ;
- }
-}
-
/* ----------------------------------------------------------------------------
* Debugging: why is a thread blocked
* [Also provides useful information when debugging threaded programs
{
switch (tso->why_blocked) {
case BlockedOnRead:
- fprintf(stderr,"is blocked on read from fd %d", tso->block_info.fd);
+ debugBelch("is blocked on read from fd %d", tso->block_info.fd);
break;
case BlockedOnWrite:
- fprintf(stderr,"is blocked on write to fd %d", tso->block_info.fd);
+ debugBelch("is blocked on write to fd %d", tso->block_info.fd);
break;
-#if defined(mingw32_TARGET_OS)
+#if defined(mingw32_HOST_OS)
case BlockedOnDoProc:
- fprintf(stderr,"is blocked on proc (request: %d)", tso->block_info.async_result->reqID);
+ debugBelch("is blocked on proc (request: %d)", tso->block_info.async_result->reqID);
break;
#endif
case BlockedOnDelay:
- fprintf(stderr,"is blocked until %d", tso->block_info.target);
+ debugBelch("is blocked until %d", tso->block_info.target);
break;
case BlockedOnMVar:
- fprintf(stderr,"is blocked on an MVar");
+ debugBelch("is blocked on an MVar");
break;
case BlockedOnException:
- fprintf(stderr,"is blocked on delivering an exception to thread %d",
+ debugBelch("is blocked on delivering an exception to thread %d",
tso->block_info.tso->id);
break;
case BlockedOnBlackHole:
- fprintf(stderr,"is blocked on a black hole");
+ debugBelch("is blocked on a black hole");
break;
case NotBlocked:
- fprintf(stderr,"is not blocked");
+ debugBelch("is not blocked");
break;
#if defined(PAR)
case BlockedOnGA:
- fprintf(stderr,"is blocked on global address; local FM_BQ is %p (%s)",
+ debugBelch("is blocked on global address; local FM_BQ is %p (%s)",
tso->block_info.closure, info_type(tso->block_info.closure));
break;
case BlockedOnGA_NoSend:
- fprintf(stderr,"is blocked on global address (no send); local FM_BQ is %p (%s)",
+ debugBelch("is blocked on global address (no send); local FM_BQ is %p (%s)",
tso->block_info.closure, info_type(tso->block_info.closure));
break;
#endif
-#if defined(RTS_SUPPORTS_THREADS)
case BlockedOnCCall:
- fprintf(stderr,"is blocked on an external call");
+ debugBelch("is blocked on an external call");
break;
case BlockedOnCCall_NoUnblockExc:
- fprintf(stderr,"is blocked on an external call (exceptions were already blocked)");
+ debugBelch("is blocked on an external call (exceptions were already blocked)");
+ break;
+ case BlockedOnSTM:
+ debugBelch("is blocked on an STM operation");
break;
-#endif
default:
barf("printThreadBlockage: strange tso->why_blocked: %d for TSO %d (%d)",
tso->why_blocked, tso->id, tso);
{
switch (tso->what_next) {
case ThreadKilled:
- fprintf(stderr,"has been killed");
+ debugBelch("has been killed");
break;
case ThreadComplete:
- fprintf(stderr,"has completed");
+ debugBelch("has completed");
break;
default:
printThreadBlockage(tso);
printAllThreads(void)
{
StgTSO *t;
- void *label;
# if defined(GRAN)
char time_string[TIME_STR_LEN], node_str[NODE_STR_LEN];
ullong_format_string(TIME_ON_PROC(CurrentProc),
time_string, rtsFalse/*no commas!*/);
- fprintf(stderr, "all threads at [%s]:\n", time_string);
+ debugBelch("all threads at [%s]:\n", time_string);
# elif defined(PAR)
char time_string[TIME_STR_LEN], node_str[NODE_STR_LEN];
ullong_format_string(CURRENT_TIME,
time_string, rtsFalse/*no commas!*/);
- fprintf(stderr,"all threads at [%s]:\n", time_string);
+ debugBelch("all threads at [%s]:\n", time_string);
# else
- fprintf(stderr,"all threads:\n");
+ debugBelch("all threads:\n");
# endif
for (t = all_threads; t != END_TSO_QUEUE; t = t->global_link) {
- fprintf(stderr, "\tthread %d @ %p ", t->id, (void *)t);
- label = lookupThreadLabel(t->id);
- if (label) fprintf(stderr,"[\"%s\"] ",(char *)label);
+ debugBelch("\tthread %d @ %p ", t->id, (void *)t);
+#if defined(DEBUG)
+ {
+ void *label = lookupThreadLabel(t->id);
+ if (label) debugBelch("[\"%s\"] ",(char *)label);
+ }
+#endif
printThreadStatus(t);
- fprintf(stderr,"\n");
+ debugBelch("\n");
}
}
StgTSO *tso;
rtsBool end;
- fprintf(stderr,"## BQ of closure %p (%s): ",
+ debugBelch("## BQ of closure %p (%s): ",
node, info_type(node));
/* should cover all closures that may have a blocking queue */
switch (get_itbl(bqe)->type) {
case TSO:
- fprintf(stderr," TSO %u (%x),",
+ debugBelch(" TSO %u (%x),",
((StgTSO *)bqe)->id, ((StgTSO *)bqe));
break;
case BLOCKED_FETCH:
- fprintf(stderr," BF (node=%p, ga=((%x, %d, %x)),",
+ debugBelch(" BF (node=%p, ga=((%x, %d, %x)),",
((StgBlockedFetch *)bqe)->node,
((StgBlockedFetch *)bqe)->ga.payload.gc.gtid,
((StgBlockedFetch *)bqe)->ga.payload.gc.slot,
((StgBlockedFetch *)bqe)->ga.weight);
break;
case CONSTR:
- fprintf(stderr," %s (IP %p),",
+ debugBelch(" %s (IP %p),",
(get_itbl(bqe) == &stg_RBH_Save_0_info ? "RBH_Save_0" :
get_itbl(bqe) == &stg_RBH_Save_1_info ? "RBH_Save_1" :
get_itbl(bqe) == &stg_RBH_Save_2_info ? "RBH_Save_2" :
break;
}
} /* for */
- fputc('\n', stderr);
+ debugBelch("\n");
}
# elif defined(GRAN)
void
ASSERT(node!=(StgClosure*)NULL); // sanity check
node_loc = where_is(node);
- fprintf(stderr,"## BQ of closure %p (%s) on [PE %d]: ",
+ debugBelch("## BQ of closure %p (%s) on [PE %d]: ",
node, info_type(node), node_loc);
/*
tso_loc = where_is((StgClosure *)bqe);
switch (get_itbl(bqe)->type) {
case TSO:
- fprintf(stderr," TSO %d (%p) on [PE %d],",
+ debugBelch(" TSO %d (%p) on [PE %d],",
((StgTSO *)bqe)->id, (StgTSO *)bqe, tso_loc);
break;
case CONSTR:
- fprintf(stderr," %s (IP %p),",
+ debugBelch(" %s (IP %p),",
(get_itbl(bqe) == &stg_RBH_Save_0_info ? "RBH_Save_0" :
get_itbl(bqe) == &stg_RBH_Save_1_info ? "RBH_Save_1" :
get_itbl(bqe) == &stg_RBH_Save_2_info ? "RBH_Save_2" :
break;
}
} /* for */
- fputc('\n', stderr);
+ debugBelch("\n");
}
#else
/*
tso=tso->link) {
ASSERT(tso!=NULL && tso!=END_TSO_QUEUE); // sanity check
ASSERT(get_itbl(tso)->type == TSO); // guess what, sanity check
- fprintf(stderr," TSO %d (%p),", tso->id, tso);
+ debugBelch(" TSO %d (%p),", tso->id, tso);
}
- fputc('\n', stderr);
+ debugBelch("\n");
}
# endif
va_list ap;
va_start(ap,s);
#ifdef RTS_SUPPORTS_THREADS
- fprintf(stderr, "sched (task %p): ", osThreadId());
+ debugBelch("sched (task %p): ", osThreadId());
#elif defined(PAR)
- fprintf(stderr, "== ");
+ debugBelch("== ");
#else
- fprintf(stderr, "sched: ");
+ debugBelch("sched: ");
#endif
- vfprintf(stderr, s, ap);
- fprintf(stderr, "\n");
- fflush(stderr);
+ vdebugBelch(s, ap);
+ debugBelch("\n");
va_end(ap);
}
projects / ghc-hetmet.git / blobdiff