/* ---------------------------------------------------------------------------
- * $Id: Schedule.c,v 1.54 2000/03/16 17:33:04 simonmar Exp $
+ * $Id: Schedule.c,v 1.87 2001/01/24 15:46:19 simonmar Exp $
*
* (c) The GHC Team, 1998-2000
*
//@menu
//* Includes::
//* Variables and Data structures::
-//* Prototypes::
//* Main scheduling loop::
//* Suspend and Resume::
//* Run queue code::
#include "Schedule.h"
#include "StgMiscClosures.h"
#include "Storage.h"
-#include "Evaluator.h"
+#include "Interpreter.h"
#include "Exception.h"
#include "Printer.h"
#include "Main.h"
#include "Signals.h"
-#include "Profiling.h"
#include "Sanity.h"
#include "Stats.h"
-#include "Sparks.h"
+#include "Itimer.h"
#include "Prelude.h"
#if defined(GRAN) || defined(PAR)
# include "GranSimRts.h"
# include "FetchMe.h"
# include "HLC.h"
#endif
+#include "Sparks.h"
#include <stdarg.h>
StgTSO *run_queue_hds[MAX_PROC], *run_queue_tls[MAX_PROC];
StgTSO *blocked_queue_hds[MAX_PROC], *blocked_queue_tls[MAX_PROC];
StgTSO *ccalling_threadss[MAX_PROC];
-StgTSO *all_threadss[MAX_PROC];
+/* We use the same global list of threads (all_threads) in GranSim as in
+ the std RTS (i.e. we are cheating). However, we don't use this list in
+ the GranSim specific code at the moment (so we are only potentially
+ cheating). */
#else /* !GRAN */
StgTSO *run_queue_hd, *run_queue_tl;
StgTSO *blocked_queue_hd, *blocked_queue_tl;
+StgTSO *sleeping_queue; /* perhaps replace with a hash table? */
+
+#endif
/* Linked list of all threads.
* Used for detecting garbage collected threads.
static void GetRoots(void);
static StgTSO *threadStackOverflow(StgTSO *tso);
-#endif
/* KH: The following two flags are shared memory locations. There is no need
to lock them, since they are only unset at the end of a scheduler
#endif
#if defined(GRAN)
-StgTSO *CurrentTSOs[MAX_PROC];
-#else
-StgTSO *CurrentTSO;
+StgTSO *CurrentTSO;
#endif
+/* This is used in `TSO.h' and gcc 2.96 insists that this variable actually
+ * exists - earlier gccs apparently didn't.
+ * -= chak
+ */
+StgTSO dummy_tso;
+
rtsBool ready_to_gc;
/* All our current task ids, saved in case we need to kill them later.
static void schedule ( void );
void interruptStgRts ( void );
+#if defined(GRAN)
+static StgTSO * createThread_ ( nat size, rtsBool have_lock, StgInt pri );
+#else
static StgTSO * createThread_ ( nat size, rtsBool have_lock );
+#endif
+
+static void detectBlackHoles ( void );
#ifdef DEBUG
static void sched_belch(char *s, ...);
rtsTime TimeOfLastYield;
#endif
+#if DEBUG
+char *whatNext_strs[] = {
+ "ThreadEnterGHC",
+ "ThreadRunGHC",
+ "ThreadEnterInterp",
+ "ThreadKilled",
+ "ThreadComplete"
+};
+
+char *threadReturnCode_strs[] = {
+ "HeapOverflow", /* might also be StackOverflow */
+ "StackOverflow",
+ "ThreadYielding",
+ "ThreadBlocked",
+ "ThreadFinished"
+};
+#endif
+
/*
* The thread state for the main thread.
// ToDo: check whether not needed any more
StgTSO *MainTSO;
*/
-
-//@node Prototypes, Main scheduling loop, Variables and Data structures, Main scheduling code
-//@subsection Prototypes
-
//@node Main scheduling loop, Suspend and Resume, Prototypes, Main scheduling code
//@subsection Main scheduling loop
* waiting for work, or
* waiting for a GC to complete.
+ GRAN version:
+ In a GranSim setup this loop iterates over the global event queue.
+ This revolves around the global event queue, which determines what
+ to do next. Therefore, it's more complicated than either the
+ concurrent or the parallel (GUM) setup.
+
+ GUM version:
+ GUM iterates over incoming messages.
+ It starts with nothing to do (thus CurrentTSO == END_TSO_QUEUE),
+ and sends out a fish whenever it has nothing to do; in-between
+ doing the actual reductions (shared code below) it processes the
+ incoming messages and deals with delayed operations
+ (see PendingFetches).
+ This is not the ugliest code you could imagine, but it's bloody close.
+
------------------------------------------------------------------------ */
//@cindex schedule
static void
#if defined(GRAN)
rtsEvent *event;
#elif defined(PAR)
+ StgSparkPool *pool;
rtsSpark spark;
StgTSO *tso;
GlobalTaskId pe;
ACQUIRE_LOCK(&sched_mutex);
#if defined(GRAN)
-# error ToDo: implement GranSim scheduler
+
+ /* set up first event to get things going */
+ /* ToDo: assign costs for system setup and init MainTSO ! */
+ new_event(CurrentProc, CurrentProc, CurrentTime[CurrentProc],
+ ContinueThread,
+ CurrentTSO, (StgClosure*)NULL, (rtsSpark*)NULL);
+
+ IF_DEBUG(gran,
+ fprintf(stderr, "GRAN: Init CurrentTSO (in schedule) = %p\n", CurrentTSO);
+ G_TSO(CurrentTSO, 5));
+
+ if (RtsFlags.GranFlags.Light) {
+ /* Save current time; GranSim Light only */
+ CurrentTSO->gran.clock = CurrentTime[CurrentProc];
+ }
+
+ event = get_next_event();
+
+ while (event!=(rtsEvent*)NULL) {
+ /* Choose the processor with the next event */
+ CurrentProc = event->proc;
+ CurrentTSO = event->tso;
+
#elif defined(PAR)
+
while (!GlobalStopPending) { /* GlobalStopPending set in par_exit */
- if (PendingFetches != END_BF_QUEUE) {
- processFetches();
- }
#else
+
while (1) {
+
#endif
IF_DEBUG(scheduler, printAllThreads());
*/
if (interrupted) {
IF_DEBUG(scheduler, sched_belch("interrupted"));
- for (t = run_queue_hd; t != END_TSO_QUEUE; t = t->link) {
- deleteThread(t);
- }
- for (t = blocked_queue_hd; t != END_TSO_QUEUE; t = t->link) {
- deleteThread(t);
- }
- run_queue_hd = run_queue_tl = END_TSO_QUEUE;
- blocked_queue_hd = blocked_queue_tl = END_TSO_QUEUE;
+ deleteAllThreads();
interrupted = rtsFalse;
was_interrupted = rtsTrue;
}
StgMainThread *m, **prev;
prev = &main_threads;
for (m = main_threads; m != NULL; m = m->link) {
- switch (m->tso->whatNext) {
+ switch (m->tso->what_next) {
case ThreadComplete:
if (m->ret) {
*(m->ret) = (StgClosure *)m->tso->sp[0];
}
}
}
+
#else
+# 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->whatNext == ThreadComplete
- || m->tso->whatNext == ThreadKilled) {
+ if (m->tso->what_next == ThreadComplete
+ || m->tso->what_next == ThreadKilled) {
main_threads = main_threads->link;
- if (m->tso->whatNext == ThreadComplete) {
+ if (m->tso->what_next == ThreadComplete) {
/* we finished successfully, fill in the return value */
if (m->ret) { *(m->ret) = (StgClosure *)m->tso->sp[0]; };
m->stat = Success;
* ToDo: what if another client comes along & requests another
* main thread?
*/
- if (blocked_queue_hd != END_TSO_QUEUE) {
+ if (blocked_queue_hd != END_TSO_QUEUE || sleeping_queue != END_TSO_QUEUE) {
awaitEvent(
(run_queue_hd == END_TSO_QUEUE)
#ifdef SMP
#endif
);
}
-
+ /* we can be interrupted while waiting for I/O... */
+ if (interrupted) continue;
+
/* check for signals each time around the scheduler */
-#ifndef __MINGW32__
+#ifndef mingw32_TARGET_OS
if (signals_pending()) {
start_signal_handlers();
}
#endif
- /* Detect deadlock: when we have no threads to run, there are
- * no threads waiting on I/O or sleeping, and all the other
- * tasks are waiting for work, we must have a deadlock. Inform
- * all the main threads.
+ /*
+ * Detect deadlock: when we have no threads to run, there are no
+ * threads waiting on I/O or sleeping, and all the other tasks are
+ * waiting for work, we must have a deadlock of some description.
+ *
+ * We first try to find threads blocked on themselves (ie. black
+ * holes), and generate NonTermination exceptions where necessary.
+ *
+ * If no threads are black holed, we have a deadlock situation, so
+ * inform all the main threads.
*/
#ifdef SMP
if (blocked_queue_hd == END_TSO_QUEUE
&& run_queue_hd == END_TSO_QUEUE
- && (n_free_capabilities == RtsFlags.ParFlags.nNodes)
- ) {
- StgMainThread *m;
- for (m = main_threads; m != NULL; m = m->link) {
- m->ret = NULL;
- m->stat = Deadlock;
- pthread_cond_broadcast(&m->wakeup);
- }
- main_threads = NULL;
+ && sleeping_queue == END_TSO_QUEUE
+ && (n_free_capabilities == RtsFlags.ParFlags.nNodes))
+ {
+ IF_DEBUG(scheduler, sched_belch("deadlocked, checking for black holes..."));
+ detectBlackHoles();
+ if (run_queue_hd == END_TSO_QUEUE) {
+ StgMainThread *m;
+ for (m = main_threads; m != NULL; m = m->link) {
+ m->ret = NULL;
+ m->stat = Deadlock;
+ pthread_cond_broadcast(&m->wakeup);
+ }
+ main_threads = NULL;
+ }
}
#else /* ! SMP */
if (blocked_queue_hd == END_TSO_QUEUE
- && run_queue_hd == END_TSO_QUEUE) {
- StgMainThread *m = main_threads;
- m->ret = NULL;
- m->stat = Deadlock;
- main_threads = m->link;
- return;
+ && run_queue_hd == END_TSO_QUEUE
+ && sleeping_queue == END_TSO_QUEUE)
+ {
+ IF_DEBUG(scheduler, sched_belch("deadlocked, checking for black holes..."));
+ detectBlackHoles();
+ if (run_queue_hd == END_TSO_QUEUE) {
+ StgMainThread *m = main_threads;
+ m->ret = NULL;
+ m->stat = Deadlock;
+ main_threads = m->link;
+ return;
+ }
}
#endif
#endif
#if defined(GRAN)
-# error ToDo: implement GranSim scheduler
+
+ if (RtsFlags.GranFlags.Light)
+ GranSimLight_enter_system(event, &ActiveTSO); // adjust ActiveTSO etc
+
+ /* adjust time based on time-stamp */
+ if (event->time > CurrentTime[CurrentProc] &&
+ event->evttype != ContinueThread)
+ CurrentTime[CurrentProc] = event->time;
+
+ /* Deal with the idle PEs (may issue FindWork or MoveSpark events) */
+ if (!RtsFlags.GranFlags.Light)
+ handleIdlePEs();
+
+ IF_DEBUG(gran, fprintf(stderr, "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"));
+ /* 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]",
+ 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)",
+ 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)",
+ 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",
+ CurrentTSO->id, CurrentTSO, CurrentProc);
+ break; // run the thread anyway
+ }
+ /*
+ new_event(proc, proc, CurrentTime[proc],
+ FindWork,
+ (StgTSO*)NULL, (StgClosure*)NULL, (rtsSpark*)NULL);
+ goto next_thread;
+ */ /* Catches superfluous CONTINUEs -- should be unnecessary */
+ break; // now actually run the thread; DaH Qu'vam yImuHbej
+
+ case FetchNode:
+ do_the_fetchnode(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case GlobalBlock:
+ do_the_globalblock(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case FetchReply:
+ do_the_fetchreply(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case UnblockThread: /* Move from the blocked queue to the tail of */
+ do_the_unblock(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case ResumeThread: /* Move from the blocked queue to the tail of */
+ /* the runnable queue ( i.e. Qu' SImqa'lu') */
+ event->tso->gran.blocktime +=
+ CurrentTime[CurrentProc] - event->tso->gran.blockedat;
+ do_the_startthread(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case StartThread:
+ do_the_startthread(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case MoveThread:
+ do_the_movethread(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case MoveSpark:
+ do_the_movespark(event);
+ goto next_thread; /* handle next event in event queue */
+
+ case FindWork:
+ do_the_findwork(event);
+ goto next_thread; /* handle next event in event queue */
+
+ default:
+ barf("Illegal event type %u\n", event->evttype);
+ } /* switch */
+
+ /* This point was scheduler_loop in the old RTS */
+
+ IF_DEBUG(gran, belch("GRAN: after main switch"));
+
+ 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",
+ TimeOfNextEvent));
+
+ if (RtsFlags.GranFlags.Light)
+ GranSimLight_leave_system(event, &ActiveTSO);
+
+ EndOfTimeSlice = CurrentTime[CurrentProc]+RtsFlags.GranFlags.time_slice;
+
+ IF_DEBUG(gran,
+ belch("GRAN: end of time-slice is %#lx", EndOfTimeSlice));
+
+ /* in a GranSim setup the TSO stays on the run queue */
+ t = CurrentTSO;
+ /* Take a thread from the run queue. */
+ t = POP_RUN_QUEUE(); // take_off_run_queue(t);
+
+ IF_DEBUG(gran,
+ fprintf(stderr, "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_DEBUG(gran,
+ DumpGranEvent(GR_SCHEDULE, t));
+
+ procStatus[CurrentProc] = Busy;
+
#elif defined(PAR)
+
+ if (PendingFetches != END_BF_QUEUE) {
+ processFetches();
+ }
+
/* ToDo: phps merge with spark activation above */
/* check whether we have local work and send requests if we have none */
if (run_queue_hd == END_TSO_QUEUE) { /* no runnable threads */
/* :-[ no local threads => look out for local sparks */
+ /* the spark pool for the current PE */
+ pool = &(MainRegTable.rSparks); // generalise to cap = &MainRegTable
if (advisory_thread_count < RtsFlags.ParFlags.maxThreads &&
- (pending_sparks_hd[REQUIRED_POOL] < pending_sparks_tl[REQUIRED_POOL] ||
- pending_sparks_hd[ADVISORY_POOL] < pending_sparks_tl[ADVISORY_POOL])) {
+ pool->hd < pool->tl) {
/*
* ToDo: add GC code check that we really have enough heap afterwards!!
* Old comment:
spark = findSpark(); /* get a spark */
if (spark != (rtsSpark) NULL) {
tso = activateSpark(spark); /* turn the spark into a thread */
- IF_PAR_DEBUG(verbose,
- belch("== [%x] schedule: Created TSO %p (%d); %d threads active",
- mytid, tso, tso->id, advisory_thread_count));
+ IF_PAR_DEBUG(schedule,
+ belch("==== schedule: Created TSO %d (%p); %d threads active",
+ tso->id, tso, advisory_thread_count));
if (tso==END_TSO_QUEUE) { /* failed to activate spark->back to loop */
- belch("^^ failed to activate spark");
+ belch("==^^ failed to activate spark");
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)",
- spark_queue_len(ADVISORY_POOL)));
+ belch("==^^ no local sparks (spark pool contains only NFs: %d)",
+ spark_queue_len(pool)));
goto next_thread;
}
} else
/* Now we are sure that we have some work available */
ASSERT(run_queue_hd != END_TSO_QUEUE);
/* Take a thread from the run queue, if we have work */
- t = take_off_run_queue(END_TSO_QUEUE);
+ t = POP_RUN_QUEUE(); // take_off_run_queue(END_TSO_QUEUE);
/* ToDo: write something to the log-file
if (RTSflags.ParFlags.granSimStats && !sameThread)
DumpGranEvent(GR_SCHEDULE, RunnableThreadsHd);
- */
CurrentTSO = t;
+ */
+ /* the spark pool for the current PE */
+ pool = &(MainRegTable.rSparks); // generalise to cap = &MainRegTable
- IF_DEBUG(scheduler, belch("--^^ %d sparks on [%#x] (hd=%x; tl=%x; lim=%x)",
- spark_queue_len(ADVISORY_POOL), CURRENT_PROC,
- pending_sparks_hd[ADVISORY_POOL],
- pending_sparks_tl[ADVISORY_POOL],
- pending_sparks_lim[ADVISORY_POOL]));
+ IF_DEBUG(scheduler, belch("--^^ %d sparks on [%#x] (hd=%x; tl=%x; base=%x, lim=%x)",
+ spark_queue_len(pool),
+ CURRENT_PROC,
+ pool->hd, pool->tl, pool->base, pool->lim));
IF_DEBUG(scheduler, belch("--== %d threads on [%#x] (hd=%x; tl=%x)",
run_queue_len(), CURRENT_PROC,
run_queue_hd, run_queue_tl));
+#if 0
if (t != LastTSO) {
/*
we are running a different TSO, so write a schedule event to log file
GR_SCHEDULE, t, (StgClosure *)NULL, 0, 0);
}
-
+#endif
#else /* !GRAN && !PAR */
/* grab a thread from the run queue
*/
+ ASSERT(run_queue_hd != END_TSO_QUEUE);
t = POP_RUN_QUEUE();
IF_DEBUG(sanity,checkTSO(t));
cap->rCurrentTSO = t;
- /* set the context_switch flag
+ /* context switches are now initiated by the timer signal, unless
+ * the user specified "context switch as often as possible", with
+ * +RTS -C0
*/
- if (run_queue_hd == END_TSO_QUEUE)
- context_switch = 0;
+ if (RtsFlags.ConcFlags.ctxtSwitchTicks == 0
+ && (run_queue_hd != END_TSO_QUEUE
+ || blocked_queue_hd != END_TSO_QUEUE
+ || sleeping_queue != END_TSO_QUEUE))
+ context_switch = 1;
else
- context_switch = 1;
+ context_switch = 0;
RELEASE_LOCK(&sched_mutex);
-
- IF_DEBUG(scheduler,sched_belch("running thread %d", t->id));
+
+ IF_DEBUG(scheduler, sched_belch("-->> Running TSO %ld (%p) %s ...",
+ t->id, t, whatNext_strs[t->what_next]));
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
/* Run the current thread
*/
- switch (cap->rCurrentTSO->whatNext) {
+ switch (cap->rCurrentTSO->what_next) {
case ThreadKilled:
case ThreadComplete:
/* Thread already finished, return to scheduler. */
case ThreadRunGHC:
ret = StgRun((StgFunPtr) stg_returnToStackTop, cap);
break;
- case ThreadEnterHugs:
-#ifdef INTERPRETER
+ case ThreadEnterInterp:
+#ifdef GHCI
{
- StgClosure* c;
- IF_DEBUG(scheduler,sched_belch("entering Hugs"));
- c = (StgClosure *)(cap->rCurrentTSO->sp[0]);
- cap->rCurrentTSO->sp += 1;
- ret = enter(cap,c);
+ IF_DEBUG(scheduler,sched_belch("entering interpreter"));
+ ret = interpretBCO(cap);
break;
}
#else
barf("Panic: entered a BCO but no bytecode interpreter in this build");
#endif
default:
- barf("schedule: invalid whatNext field");
+ barf("schedule: invalid what_next field");
}
/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
#ifdef SMP
IF_DEBUG(scheduler,fprintf(stderr,"scheduler (task %ld): ", pthread_self()););
-#else
+#elif !defined(GRAN) && !defined(PAR)
IF_DEBUG(scheduler,fprintf(stderr,"scheduler: "););
#endif
t = cap->rCurrentTSO;
+#if defined(PAR)
+ /* HACK 675: if the last thread didn't yield, make sure to print a
+ SCHEDULE event to the log file when StgRunning the next thread, even
+ if it is the same one as before */
+ LastTSO = t; //(ret == ThreadBlocked) ? END_TSO_QUEUE : t;
+ TimeOfLastYield = CURRENT_TIME;
+#endif
+
switch (ret) {
case HeapOverflow:
/* 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.
*/
- IF_DEBUG(scheduler,belch("thread %ld stopped: HeapOverflow", t->id));
+ IF_DEBUG(scheduler,belch("--<< thread %ld (%p; %s) stopped: HeapOverflow",
+ t->id, t, 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;
case StackOverflow:
+ IF_DEBUG(scheduler,belch("--<< thread %ld (%p; %s) stopped, StackOverflow",
+ t->id, t, whatNext_strs[t->what_next]));
/* just adjust the stack for this thread, then pop it back
* on the run queue.
*/
- IF_DEBUG(scheduler,belch("thread %ld stopped, StackOverflow", t->id));
threadPaused(t);
{
StgMainThread *m;
* GC is finished.
*/
IF_DEBUG(scheduler,
- if (t->whatNext == ThreadEnterHugs) {
- /* ToDo: or maybe a timer expired when we were in Hugs?
- * or maybe someone hit ctrl-C
- */
- belch("thread %ld stopped to switch to Hugs", t->id);
- } else {
- belch("thread %ld stopped, yielding", t->id);
- }
- );
+ if (t->what_next == ThreadEnterInterp) {
+ /* ToDo: or maybe a timer expired when we were in Hugs?
+ * or maybe someone hit ctrl-C
+ */
+ belch("--<< thread %ld (%p; %s) stopped to switch to Hugs",
+ t->id, t, whatNext_strs[t->what_next]);
+ } else {
+ belch("--<< thread %ld (%p; %s) stopped, yielding",
+ t->id, t, whatNext_strs[t->what_next]);
+ }
+ );
+
threadPaused(t);
+
+ IF_DEBUG(sanity,
+ //belch("&& Doing sanity check on yielding TSO %ld.", t->id);
+ checkTSO(t));
+ ASSERT(t->link == END_TSO_QUEUE);
+#if defined(GRAN)
+ ASSERT(!is_on_queue(t,CurrentProc));
+
+ IF_DEBUG(sanity,
+ //belch("&& Doing sanity check on all ThreadQueues (and their TSOs).");
+ checkThreadQsSanity(rtsTrue));
+#endif
APPEND_TO_RUN_QUEUE(t);
+#if defined(GRAN)
+ /* add a ContinueThread event to actually process the thread */
+ new_event(CurrentProc, CurrentProc, CurrentTime[CurrentProc],
+ ContinueThread,
+ t, (StgClosure*)NULL, (rtsSpark*)NULL);
+ IF_GRAN_DEBUG(bq,
+ belch("GRAN: eventq and runnableq after adding yielded thread to queue again:");
+ G_EVENTQ(0);
+ G_CURR_THREADQ(0))
+#endif /* GRAN */
break;
case ThreadBlocked:
#if defined(GRAN)
-# error ToDo: implement GranSim scheduler
+ IF_DEBUG(scheduler,
+ belch("--<< thread %ld (%p; %s) stopped, blocking on node %p [PE %d] with BQ: ",
+ 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));
+
+ // ??? needed; should emit block before
+ IF_DEBUG(gran,
+ DumpGranEvent(GR_DESCHEDULE, t));
+ prune_eventq(t, (StgClosure *)NULL); // prune ContinueThreads for t
+ /*
+ ngoq Dogh!
+ ASSERT(procStatus[CurrentProc]==Busy ||
+ ((procStatus[CurrentProc]==Fetching) &&
+ (t->block_info.closure!=(StgClosure*)NULL)));
+ if (run_queue_hds[CurrentProc] == END_TSO_QUEUE &&
+ !(!RtsFlags.GranFlags.DoAsyncFetch &&
+ procStatus[CurrentProc]==Fetching))
+ procStatus[CurrentProc] = Idle;
+ */
#elif defined(PAR)
IF_DEBUG(par,
DumpGranEvent(GR_DESCHEDULE, t));
-#else
-#endif
+
+ /* Send a fetch (if BlockedOnGA) and dump event to log file */
+ blockThread(t);
+
+ IF_DEBUG(scheduler,
+ belch("--<< thread %ld (%p; %s) stopped, blocking on node %p with BQ: ",
+ t->id, t, whatNext_strs[t->what_next], t->block_info.closure);
+ if (t->block_info.closure!=(StgClosure*)NULL) print_bq(t->block_info.closure));
+
+#else /* !GRAN */
/* don't need to do anything. Either the thread is blocked on
* I/O, in which case we'll have called addToBlockedQueue
* previously, or it's blocked on an MVar or Blackhole, in which
* case it'll be on the relevant queue already.
*/
IF_DEBUG(scheduler,
- fprintf(stderr, "thread %d stopped, ", t->id);
+ fprintf(stderr, "--<< thread %d (%p) stopped: ", t->id, t);
printThreadBlockage(t);
fprintf(stderr, "\n"));
+
+ /* Only for dumping event to log file
+ ToDo: do I need this in GranSim, too?
+ blockThread(t);
+ */
+#endif
threadPaused(t);
break;
* more main threads, we probably need to stop all the tasks until
* we get a new one.
*/
- IF_DEBUG(scheduler,belch("thread %ld finished", t->id));
- t->whatNext = ThreadComplete;
+ /* We also end up here if the thread kills itself with an
+ * uncaught exception, see Exception.hc.
+ */
+ IF_DEBUG(scheduler,belch("--++ thread %d (%p) finished", t->id, t));
#if defined(GRAN)
- // ToDo: endThread(t, CurrentProc); // clean-up the thread
+ endThread(t, CurrentProc); // clean-up the thread
#elif defined(PAR)
advisory_thread_count--;
if (RtsFlags.ParFlags.ParStats.Full)
break;
default:
- barf("doneThread: invalid thread return code");
+ barf("schedule: invalid thread return code %d", (int)ret);
}
#ifdef SMP
#ifdef SMP
IF_DEBUG(scheduler,sched_belch("doing GC"));
#endif
- GarbageCollect(GetRoots);
+ GarbageCollect(GetRoots,rtsFalse);
ready_to_gc = rtsFalse;
#ifdef SMP
pthread_cond_broadcast(&gc_pending_cond);
#endif
+#if defined(GRAN)
+ /* add a ContinueThread event to continue execution of current thread */
+ new_event(CurrentProc, CurrentProc, CurrentTime[CurrentProc],
+ ContinueThread,
+ t, (StgClosure*)NULL, (rtsSpark*)NULL);
+ IF_GRAN_DEBUG(bq,
+ fprintf(stderr, "GRAN: eventq and runnableq after Garbage collection:\n");
+ G_EVENTQ(0);
+ G_CURR_THREADQ(0))
+#endif /* GRAN */
}
#if defined(GRAN)
next_thread:
} /* end of while(1) */
}
-/* A hack for Hugs concurrency support. Needs sanitisation (?) */
+/* ---------------------------------------------------------------------------
+ * deleteAllThreads(): kill all the live threads.
+ *
+ * This is used when we catch a user interrupt (^C), before performing
+ * any necessary cleanups and running finalizers.
+ * ------------------------------------------------------------------------- */
+
void deleteAllThreads ( void )
{
StgTSO* t;
- IF_DEBUG(scheduler,sched_belch("deleteAllThreads()"));
+ IF_DEBUG(scheduler,sched_belch("deleting all threads"));
for (t = run_queue_hd; t != END_TSO_QUEUE; t = t->link) {
- deleteThread(t);
+ deleteThread(t);
}
for (t = blocked_queue_hd; t != END_TSO_QUEUE; t = t->link) {
- deleteThread(t);
+ deleteThread(t);
+ }
+ for (t = sleeping_queue; t != END_TSO_QUEUE; t = t->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;
}
/* startThread and insertThread are now in GranSim.c -- HWL */
ACQUIRE_LOCK(&sched_mutex);
IF_DEBUG(scheduler,
- sched_belch("thread %d did a _ccall_gc\n", cap->rCurrentTSO->id));
+ sched_belch("thread %d did a _ccall_gc", cap->rCurrentTSO->id));
threadPaused(cap->rCurrentTSO);
cap->rCurrentTSO->link = suspended_ccalling_threads;
if (tso == END_TSO_QUEUE) {
barf("resumeThread: thread not found");
}
+ tso->link = END_TSO_QUEUE;
#ifdef SMP
while (free_capabilities == NULL) {
createGenThread() and createIOThread() (in SchedAPI.h) are
convenient packaged versions of this function.
+
+ currently pri (priority) is only used in a GRAN setup -- HWL
------------------------------------------------------------------------ */
//@cindex createThread
#if defined(GRAN)
-/* currently pri (priority) is only used in a GRAN setup -- HWL */
+/* currently pri (priority) is only used in a GRAN setup -- HWL */
StgTSO *
createThread(nat stack_size, StgInt pri)
{
createThread_(nat size, rtsBool have_lock)
{
#endif
+
StgTSO *tso;
nat stack_size;
tso = (StgTSO *)allocate(size);
TICK_ALLOC_TSO(size-TSO_STRUCT_SIZEW, 0);
- SET_HDR(tso, &TSO_info, CCS_MAIN);
+ SET_HDR(tso, &stg_TSO_info, CCS_SYSTEM);
#if defined(GRAN)
SET_GRAN_HDR(tso, ThisPE);
#endif
- tso->whatNext = ThreadEnterGHC;
+ tso->what_next = ThreadEnterGHC;
/* tso->id needs to be unique. For now we use a heavyweight mutex to
* protect the increment operation on next_thread_id.
tso->why_blocked = NotBlocked;
tso->blocked_exceptions = NULL;
- tso->splim = (P_)&(tso->stack) + RESERVED_STACK_WORDS;
tso->stack_size = stack_size;
tso->max_stack_size = round_to_mblocks(RtsFlags.GcFlags.maxStkSize)
- TSO_STRUCT_SIZEW;
/* put a stop frame on the stack */
tso->sp -= sizeofW(StgStopFrame);
- SET_HDR((StgClosure*)tso->sp,(StgInfoTable *)&stg_stop_thread_info,CCS_MAIN);
+ SET_HDR((StgClosure*)tso->sp,(StgInfoTable *)&stg_stop_thread_info,CCS_SYSTEM);
tso->su = (StgUpdateFrame*)tso->sp;
- IF_DEBUG(scheduler,belch("---- Initialised TSO %ld (%p), stack size = %lx words",
- tso->id, tso, tso->stack_size));
-
// ToDo: check this
#if defined(GRAN)
tso->link = END_TSO_QUEUE;
*/
#endif
+#if defined(GRAN) || defined(PAR)
+ DumpGranEvent(GR_START,tso);
+#endif
+
/* Link the new thread on the global thread list.
*/
-#if defined(GRAN)
-#error ToDo
-#else
tso->global_link = all_threads;
all_threads = tso;
-#endif
#if defined(GRAN)
tso->gran.pri = pri;
+# if defined(DEBUG)
tso->gran.magic = TSO_MAGIC; // debugging only
+# endif
tso->gran.sparkname = 0;
tso->gran.startedat = CURRENT_TIME;
tso->gran.exported = 0;
IF_DEBUG(gran,printTSO(tso));
#elif defined(PAR)
+# if defined(DEBUG)
+ tso->par.magic = TSO_MAGIC; // debugging only
+# endif
tso->par.sparkname = 0;
tso->par.startedat = CURRENT_TIME;
tso->par.exported = 0;
globalGranStats.tot_sq_probes++;
#endif
+#if defined(GRAN)
+ IF_GRAN_DEBUG(pri,
+ 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));
+#else
IF_DEBUG(scheduler,sched_belch("created thread %ld, stack size = %lx words",
tso->id, tso->stack_size));
+#endif
+ return tso;
+}
+
+/*
+ Turn a spark into a thread.
+ ToDo: fix for SMP (needs to acquire SCHED_MUTEX!)
+*/
+#if defined(PAR)
+//@cindex activateSpark
+StgTSO *
+activateSpark (rtsSpark spark)
+{
+ StgTSO *tso;
+
+ ASSERT(spark != (rtsSpark)NULL);
+ tso = createThread_(RtsFlags.GcFlags.initialStkSize, rtsTrue);
+ if (tso!=END_TSO_QUEUE) {
+ pushClosure(tso,spark);
+ PUSH_ON_RUN_QUEUE(tso);
+ advisory_thread_count++;
+
+ 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",
+ (StgClosure *)spark, info_type((StgClosure *)spark)));
+ }
+ } else {
+ barf("activateSpark: Cannot create TSO");
+ }
+ // ToDo: fwd info on local/global spark to thread -- HWL
+ // tso->gran.exported = spark->exported;
+ // tso->gran.locked = !spark->global;
+ // tso->gran.sparkname = spark->name;
+
return tso;
}
+#endif
/* ---------------------------------------------------------------------------
* scheduleThread()
void
scheduleThread(StgTSO *tso)
{
+ if (tso==END_TSO_QUEUE){
+ schedule();
+ return;
+ }
+
ACQUIRE_LOCK(&sched_mutex);
/* Put the new thread on the head of the runnable queue. The caller
PUSH_ON_RUN_QUEUE(tso);
THREAD_RUNNABLE();
+#if 0
IF_DEBUG(scheduler,printTSO(tso));
+#endif
RELEASE_LOCK(&sched_mutex);
}
* KH @ 25/10/99
* ------------------------------------------------------------------------ */
-#ifdef SMP
-static void *
+#if defined(PAR) || defined(SMP)
+void *
taskStart( void *arg STG_UNUSED )
{
- schedule();
- return NULL;
+ rts_evalNothing(NULL);
}
#endif
blocked_queue_hds[i] = END_TSO_QUEUE;
blocked_queue_tls[i] = END_TSO_QUEUE;
ccalling_threadss[i] = END_TSO_QUEUE;
+ sleeping_queue = END_TSO_QUEUE;
}
#else
run_queue_hd = END_TSO_QUEUE;
run_queue_tl = END_TSO_QUEUE;
blocked_queue_hd = END_TSO_QUEUE;
blocked_queue_tl = END_TSO_QUEUE;
+ sleeping_queue = END_TSO_QUEUE;
#endif
suspended_ccalling_threads = END_TSO_QUEUE;
context_switch = 0;
interrupted = 0;
- enteredCAFs = END_CAF_LIST;
+ RtsFlags.ConcFlags.ctxtSwitchTicks =
+ RtsFlags.ConcFlags.ctxtSwitchTime / TICK_MILLISECS;
+
+#ifdef INTERPRETER
+ ecafList = END_ECAF_LIST;
+ clearECafTable();
+#endif
/* Install the SIGHUP handler */
#ifdef SMP
-------------------------------------------------------------------------- */
/* -----------------------------------------------------------------------------
- * waitThread is the external interface for running a new computataion
+ * waitThread is the external interface for running a new computation
* and waiting for the result.
*
* In the non-SMP case, we create a new main thread, push it on the
* will be in the main_thread struct.
* -------------------------------------------------------------------------- */
+int
+howManyThreadsAvail ( void )
+{
+ int i = 0;
+ StgTSO* q;
+ for (q = run_queue_hd; q != END_TSO_QUEUE; q = q->link)
+ i++;
+ for (q = blocked_queue_hd; q != END_TSO_QUEUE; q = q->link)
+ i++;
+ for (q = sleeping_queue; q != END_TSO_QUEUE; q = q->link)
+ i++;
+ return i;
+}
+
+void
+finishAllThreads ( void )
+{
+ do {
+ while (run_queue_hd != END_TSO_QUEUE) {
+ waitThread ( run_queue_hd, NULL );
+ }
+ while (blocked_queue_hd != END_TSO_QUEUE) {
+ waitThread ( blocked_queue_hd, NULL );
+ }
+ while (sleeping_queue != END_TSO_QUEUE) {
+ waitThread ( blocked_queue_hd, NULL );
+ }
+ } while
+ (blocked_queue_hd != END_TSO_QUEUE ||
+ run_queue_hd != END_TSO_QUEUE ||
+ sleeping_queue != END_TSO_QUEUE);
+}
+
SchedulerStatus
waitThread(StgTSO *tso, /*out*/StgClosure **ret)
{
do {
pthread_cond_wait(&m->wakeup, &sched_mutex);
} while (m->stat == NoStatus);
+#elif defined(GRAN)
+ /* GranSim specific init */
+ CurrentTSO = m->tso; // the TSO to run
+ procStatus[MainProc] = Busy; // status of main PE
+ CurrentProc = MainProc; // PE to run it on
+
+ schedule();
#else
schedule();
ASSERT(m->stat != NoStatus);
- all the threads on the runnable queue
- all the threads on the blocked queue
+ - all the threads on the sleeping queue
- all the thread currently executing a _ccall_GC
- all the "main threads"
markEventQueue();
#else /* !GRAN */
- run_queue_hd = (StgTSO *)MarkRoot((StgClosure *)run_queue_hd);
- run_queue_tl = (StgTSO *)MarkRoot((StgClosure *)run_queue_tl);
+ if (run_queue_hd != END_TSO_QUEUE) {
+ ASSERT(run_queue_tl != END_TSO_QUEUE);
+ run_queue_hd = (StgTSO *)MarkRoot((StgClosure *)run_queue_hd);
+ run_queue_tl = (StgTSO *)MarkRoot((StgClosure *)run_queue_tl);
+ }
+
+ if (blocked_queue_hd != END_TSO_QUEUE) {
+ ASSERT(blocked_queue_tl != END_TSO_QUEUE);
+ blocked_queue_hd = (StgTSO *)MarkRoot((StgClosure *)blocked_queue_hd);
+ blocked_queue_tl = (StgTSO *)MarkRoot((StgClosure *)blocked_queue_tl);
+ }
- blocked_queue_hd = (StgTSO *)MarkRoot((StgClosure *)blocked_queue_hd);
- blocked_queue_tl = (StgTSO *)MarkRoot((StgClosure *)blocked_queue_tl);
+ if (sleeping_queue != END_TSO_QUEUE) {
+ sleeping_queue = (StgTSO *)MarkRoot((StgClosure *)sleeping_queue);
+ }
#endif
for (m = main_threads; m != NULL; m = m->link) {
m->tso = (StgTSO *)MarkRoot((StgClosure *)m->tso);
}
- suspended_ccalling_threads =
- (StgTSO *)MarkRoot((StgClosure *)suspended_ccalling_threads);
+ if (suspended_ccalling_threads != END_TSO_QUEUE)
+ suspended_ccalling_threads =
+ (StgTSO *)MarkRoot((StgClosure *)suspended_ccalling_threads);
#if defined(SMP) || defined(PAR) || defined(GRAN)
markSparkQueue();
#endif
+
+#if defined(GHCI)
+ markCafs();
+#endif
}
/* -----------------------------------------------------------------------------
void
performGC(void)
{
- GarbageCollect(GetRoots);
+ GarbageCollect(GetRoots,rtsFalse);
+}
+
+void
+performMajorGC(void)
+{
+ GarbageCollect(GetRoots,rtsTrue);
}
static void
{
extra_roots = get_roots;
- GarbageCollect(AllRoots);
+ GarbageCollect(AllRoots,rtsFalse);
}
/* -----------------------------------------------------------------------------
IF_DEBUG(sanity,checkTSO(tso));
if (tso->stack_size >= tso->max_stack_size) {
-#if 0
- /* 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));
-#endif
+
+ 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);
+ /* 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)));
+
#ifdef INTERPRETER
fprintf(stderr, "fatal: stack overflow in Hugs; aborting\n" );
exit(1);
diff = (P_)new_sp - (P_)tso->sp; /* In *words* */
dest->su = (StgUpdateFrame *) ((P_)dest->su + diff);
dest->sp = new_sp;
- dest->splim = (P_)dest->splim + (nat)((P_)dest - (P_)tso);
dest->stack_size = new_stack_size;
/* and relocate the update frame list */
* of the stack, so we don't attempt to scavenge any part of the
* dead TSO's stack.
*/
- tso->whatNext = ThreadRelocated;
+ tso->what_next = ThreadRelocated;
tso->link = dest;
tso->sp = (P_)&(tso->stack[tso->stack_size]);
tso->su = (StgUpdateFrame *)tso->sp;
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",
+ 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,
+ tso->sp+64)));
+
IF_DEBUG(sanity,checkTSO(tso));
#if 0
IF_DEBUG(scheduler,printTSO(dest));
Wake up a queue that was blocked on some resource.
------------------------------------------------------------------------ */
-/* ToDo: check push_on_run_queue vs. PUSH_ON_RUN_QUEUE */
-
#if defined(GRAN)
static inline void
unblockCount ( StgBlockingQueueElement *bqe, StgClosure *node )
update blocked and fetch time (depending on type of the orig closure) */
if (RtsFlags.ParFlags.ParStats.Full) {
DumpRawGranEvent(CURRENT_PROC, CURRENT_PROC,
- GR_RESUMEQ, ((StgTSO *)bqe), ((StgTSO *)bqe)->block_info.closure,
+ GR_RESUME, ((StgTSO *)bqe), ((StgTSO *)bqe)->block_info.closure,
0, 0 /* spark_queue_len(ADVISORY_POOL) */);
switch (get_itbl(node)->type) {
static StgBlockingQueueElement *
unblockOneLocked(StgBlockingQueueElement *bqe, StgClosure *node)
{
- StgBlockingQueueElement *next;
+ StgTSO *tso;
PEs node_loc, tso_loc;
node_loc = where_is(node); // should be lifted out of loop
tso = (StgTSO *)bqe; // wastes an assignment to get the type right
- tso_loc = where_is(tso);
+ tso_loc = where_is((StgClosure *)tso);
if (IS_LOCAL_TO(PROCS(node),tso_loc)) { // TSO is local
/* !fake_fetch => TSO is on CurrentProc is same as IS_LOCAL_TO */
ASSERT(CurrentProc!=node_loc || tso_loc==CurrentProc);
- bq_processing_time += RtsFlags.GranFlags.Costs.lunblocktime;
+ CurrentTime[CurrentProc] += RtsFlags.GranFlags.Costs.lunblocktime;
// insertThread(tso, node_loc);
- new_event(tso_loc, tso_loc,
- CurrentTime[CurrentProc]+bq_processing_time,
+ new_event(tso_loc, tso_loc, CurrentTime[CurrentProc],
ResumeThread,
tso, node, (rtsSpark*)NULL);
tso->link = END_TSO_QUEUE; // overwrite link just to be sure
// len_local++;
// len++;
} else { // TSO is remote (actually should be FMBQ)
- bq_processing_time += RtsFlags.GranFlags.Costs.mpacktime;
- bq_processing_time += RtsFlags.GranFlags.Costs.gunblocktime;
- new_event(tso_loc, CurrentProc,
- CurrentTime[CurrentProc]+bq_processing_time+
- RtsFlags.GranFlags.Costs.latency,
+ CurrentTime[CurrentProc] += RtsFlags.GranFlags.Costs.mpacktime +
+ RtsFlags.GranFlags.Costs.gunblocktime +
+ RtsFlags.GranFlags.Costs.latency;
+ new_event(tso_loc, CurrentProc, CurrentTime[CurrentProc],
UnblockThread,
tso, node, (rtsSpark*)NULL);
tso->link = END_TSO_QUEUE; // overwrite link just to be sure
- bq_processing_time += RtsFlags.GranFlags.Costs.mtidytime;
// len++;
- }
+ }
/* the thread-queue-overhead is accounted for in either Resume or UnblockThread */
IF_GRAN_DEBUG(bq,
- fprintf(stderr," %s TSO %d (%p) [PE %d] (blocked_on=%p) (next=%p) ,",
+ fprintf(stderr," %s TSO %d (%p) [PE %d] (block_info.closure=%p) (next=%p) ,",
(node_loc==tso_loc ? "Local" : "Global"),
- tso->id, tso, CurrentProc, tso->blocked_on, tso->link))
- tso->blocked_on = NULL;
+ tso->id, tso, CurrentProc, tso->block_info.closure, tso->link));
+ tso->block_info.closure = NULL;
IF_DEBUG(scheduler,belch("-- Waking up thread %ld (%p)",
tso->id, tso));
- }
-
- /* if this is the BQ of an RBH, we have to put back the info ripped out of
- the closure to make room for the anchor of the BQ */
- if (next!=END_BQ_QUEUE) {
- ASSERT(get_itbl(node)->type == RBH && get_itbl(next)->type == CONSTR);
- /*
- ASSERT((info_ptr==&RBH_Save_0_info) ||
- (info_ptr==&RBH_Save_1_info) ||
- (info_ptr==&RBH_Save_2_info));
- */
- /* cf. convertToRBH in RBH.c for writing the RBHSave closure */
- ((StgRBH *)node)->blocking_queue = ((StgRBHSave *)next)->payload[0];
- ((StgRBH *)node)->mut_link = ((StgRBHSave *)next)->payload[1];
-
- IF_GRAN_DEBUG(bq,
- belch("## Filled in RBH_Save for %p (%s) at end of AwBQ",
- node, info_type(node)));
- }
}
#elif defined(PAR)
static StgBlockingQueueElement *
see comments on RBHSave closures above */
case CONSTR:
/* check that the closure is an RBHSave closure */
- ASSERT(get_itbl((StgClosure *)bqe) == &RBH_Save_0_info ||
- get_itbl((StgClosure *)bqe) == &RBH_Save_1_info ||
- get_itbl((StgClosure *)bqe) == &RBH_Save_2_info);
+ ASSERT(get_itbl((StgClosure *)bqe) == &stg_RBH_Save_0_info ||
+ get_itbl((StgClosure *)bqe) == &stg_RBH_Save_1_info ||
+ get_itbl((StgClosure *)bqe) == &stg_RBH_Save_2_info);
break;
default:
}
#endif
-#if defined(PAR) || defined(GRAN)
-inline StgTSO *
-unblockOne(StgTSO *tso, StgClosure *node)
+#if defined(GRAN) || defined(PAR)
+inline StgBlockingQueueElement *
+unblockOne(StgBlockingQueueElement *bqe, StgClosure *node)
{
ACQUIRE_LOCK(&sched_mutex);
- tso = unblockOneLocked(tso, node);
+ bqe = unblockOneLocked(bqe, node);
RELEASE_LOCK(&sched_mutex);
- return tso;
+ return bqe;
}
#else
inline StgTSO *
void
awakenBlockedQueue(StgBlockingQueueElement *q, StgClosure *node)
{
- StgBlockingQueueElement *bqe, *next;
- StgTSO *tso;
- PEs node_loc, tso_loc;
- rtsTime bq_processing_time = 0;
- nat len = 0, len_local = 0;
+ StgBlockingQueueElement *bqe;
+ PEs node_loc;
+ nat len = 0;
IF_GRAN_DEBUG(bq,
belch("## AwBQ for node %p on PE %d @ %ld by TSO %d (%p): ", \
*/
//tso = (StgTSO *)bqe; // wastes an assignment to get the type right
//tso_loc = where_is(tso);
+ len++;
bqe = unblockOneLocked(bqe, node);
}
+ /* if this is the BQ of an RBH, we have to put back the info ripped out of
+ the closure to make room for the anchor of the BQ */
+ if (bqe!=END_BQ_QUEUE) {
+ ASSERT(get_itbl(node)->type == RBH && get_itbl(bqe)->type == CONSTR);
+ /*
+ ASSERT((info_ptr==&RBH_Save_0_info) ||
+ (info_ptr==&RBH_Save_1_info) ||
+ (info_ptr==&RBH_Save_2_info));
+ */
+ /* cf. convertToRBH in RBH.c for writing the RBHSave closure */
+ ((StgRBH *)node)->blocking_queue = (StgBlockingQueueElement *)((StgRBHSave *)bqe)->payload[0];
+ ((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",
+ node, info_type(node)));
+ }
+
/* statistics gathering */
- /* ToDo: fix counters
if (RtsFlags.GranFlags.GranSimStats.Global) {
- globalGranStats.tot_bq_processing_time += bq_processing_time;
+ // globalGranStats.tot_bq_processing_time += bq_processing_time;
globalGranStats.tot_bq_len += len; // total length of all bqs awakened
- globalGranStats.tot_bq_len_local += len_local; // same for local TSOs only
+ // globalGranStats.tot_bq_len_local += len_local; // same for local TSOs only
globalGranStats.tot_awbq++; // total no. of bqs awakened
}
IF_GRAN_DEBUG(bq,
- fprintf(stderr,"## BQ Stats of %p: [%d entries, %d local] %s\n",
- node, len, len_local, (next!=END_TSO_QUEUE) ? "RBH" : ""));
- */
+ fprintf(stderr,"## BQ Stats of %p: [%d entries] %s\n",
+ node, len, (bqe!=END_BQ_QUEUE) ? "RBH" : ""));
}
#elif defined(PAR)
void
This has nothing to do with the UnblockThread event in GranSim. -- HWL
-------------------------------------------------------------------------- */
+#if defined(GRAN) || defined(PAR)
+/*
+ NB: only the type of the blocking queue is different in GranSim and GUM
+ the operations on the queue-elements are the same
+ long live polymorphism!
+*/
+static void
+unblockThread(StgTSO *tso)
+{
+ StgBlockingQueueElement *t, **last;
+
+ ACQUIRE_LOCK(&sched_mutex);
+ switch (tso->why_blocked) {
+
+ case NotBlocked:
+ return; /* not blocked */
+
+ case BlockedOnMVar:
+ ASSERT(get_itbl(tso->block_info.closure)->type == MVAR);
+ {
+ StgBlockingQueueElement *last_tso = END_BQ_QUEUE;
+ StgMVar *mvar = (StgMVar *)(tso->block_info.closure);
+
+ last = (StgBlockingQueueElement **)&mvar->head;
+ for (t = (StgBlockingQueueElement *)mvar->head;
+ t != END_BQ_QUEUE;
+ last = &t->link, last_tso = t, t = t->link) {
+ if (t == (StgBlockingQueueElement *)tso) {
+ *last = (StgBlockingQueueElement *)tso->link;
+ if (mvar->tail == tso) {
+ mvar->tail = (StgTSO *)last_tso;
+ }
+ goto done;
+ }
+ }
+ barf("unblockThread (MVAR): TSO not found");
+ }
+
+ case BlockedOnBlackHole:
+ ASSERT(get_itbl(tso->block_info.closure)->type == BLACKHOLE_BQ);
+ {
+ StgBlockingQueue *bq = (StgBlockingQueue *)(tso->block_info.closure);
+
+ last = &bq->blocking_queue;
+ for (t = bq->blocking_queue;
+ t != END_BQ_QUEUE;
+ last = &t->link, t = t->link) {
+ if (t == (StgBlockingQueueElement *)tso) {
+ *last = (StgBlockingQueueElement *)tso->link;
+ goto done;
+ }
+ }
+ barf("unblockThread (BLACKHOLE): TSO not found");
+ }
+
+ case BlockedOnException:
+ {
+ StgTSO *target = tso->block_info.tso;
+
+ ASSERT(get_itbl(target)->type == TSO);
+ ASSERT(target->blocked_exceptions != NULL);
+
+ last = (StgBlockingQueueElement **)&target->blocked_exceptions;
+ for (t = (StgBlockingQueueElement *)target->blocked_exceptions;
+ t != END_BQ_QUEUE;
+ last = &t->link, t = t->link) {
+ ASSERT(get_itbl(t)->type == TSO);
+ if (t == (StgBlockingQueueElement *)tso) {
+ *last = (StgBlockingQueueElement *)tso->link;
+ goto done;
+ }
+ }
+ barf("unblockThread (Exception): TSO not found");
+ }
+
+ case BlockedOnRead:
+ case BlockedOnWrite:
+ {
+ StgBlockingQueueElement *prev = NULL;
+ for (t = (StgBlockingQueueElement *)blocked_queue_hd; t != END_BQ_QUEUE;
+ prev = t, t = t->link) {
+ if (t == (StgBlockingQueueElement *)tso) {
+ if (prev == NULL) {
+ blocked_queue_hd = (StgTSO *)t->link;
+ if ((StgBlockingQueueElement *)blocked_queue_tl == t) {
+ blocked_queue_tl = END_TSO_QUEUE;
+ }
+ } else {
+ prev->link = t->link;
+ if ((StgBlockingQueueElement *)blocked_queue_tl == t) {
+ blocked_queue_tl = (StgTSO *)prev;
+ }
+ }
+ goto done;
+ }
+ }
+ barf("unblockThread (I/O): TSO not found");
+ }
+
+ case BlockedOnDelay:
+ {
+ StgBlockingQueueElement *prev = NULL;
+ for (t = (StgBlockingQueueElement *)sleeping_queue; t != END_BQ_QUEUE;
+ prev = t, t = t->link) {
+ if (t == (StgBlockingQueueElement *)tso) {
+ if (prev == NULL) {
+ sleeping_queue = (StgTSO *)t->link;
+ } else {
+ prev->link = t->link;
+ }
+ goto done;
+ }
+ }
+ barf("unblockThread (I/O): TSO not found");
+ }
+
+ default:
+ barf("unblockThread");
+ }
+
+ done:
+ tso->link = END_TSO_QUEUE;
+ tso->why_blocked = NotBlocked;
+ tso->block_info.closure = NULL;
+ PUSH_ON_RUN_QUEUE(tso);
+ RELEASE_LOCK(&sched_mutex);
+}
+#else
static void
unblockThread(StgTSO *tso)
{
barf("unblockThread (Exception): TSO not found");
}
- case BlockedOnDelay:
case BlockedOnRead:
case BlockedOnWrite:
{
barf("unblockThread (I/O): TSO not found");
}
+ case BlockedOnDelay:
+ {
+ StgTSO *prev = NULL;
+ for (t = sleeping_queue; t != END_TSO_QUEUE;
+ prev = t, t = t->link) {
+ if (t == tso) {
+ if (prev == NULL) {
+ sleeping_queue = t->link;
+ } else {
+ prev->link = t->link;
+ }
+ goto done;
+ }
+ }
+ barf("unblockThread (I/O): TSO not found");
+ }
+
default:
barf("unblockThread");
}
PUSH_ON_RUN_QUEUE(tso);
RELEASE_LOCK(&sched_mutex);
}
+#endif
/* -----------------------------------------------------------------------------
* raiseAsync()
StgPtr sp = tso->sp;
/* Thread already dead? */
- if (tso->whatNext == ThreadComplete || tso->whatNext == ThreadKilled) {
+ if (tso->what_next == ThreadComplete || tso->what_next == ThreadKilled) {
return;
}
* returns to the next return address on the stack.
*/
if ( LOOKS_LIKE_GHC_INFO((void*)*sp) ) {
- *(--sp) = (W_)&dummy_ret_closure;
+ *(--sp) = (W_)&stg_dummy_ret_closure;
}
while (1) {
*/
ap = (StgAP_UPD *)allocate(sizeofW(StgPAP) + 2);
TICK_ALLOC_UPD_PAP(3,0);
- SET_HDR(ap,&PAP_info,cf->header.prof.ccs);
+ SET_HDR(ap,&stg_PAP_info,cf->header.prof.ccs);
ap->n_args = 2;
ap->fun = cf->handler; /* :: Exception -> IO a */
- ap->payload[0] = (P_)exception;
+ ap->payload[0] = exception;
ap->payload[1] = ARG_TAG(0); /* realworld token */
/* throw away the stack from Sp up to and including the
* unblockAsyncExceptions_ret stack frame.
*/
if (!cf->exceptions_blocked) {
- *(sp--) = (W_)&unblockAsyncExceptionszh_ret_info;
+ *(sp--) = (W_)&stg_unblockAsyncExceptionszh_ret_info;
}
/* Ensure that async exceptions are blocked when running the handler.
*/
sp[0] = (W_)ap;
tso->sp = sp;
- tso->whatNext = ThreadEnterGHC;
+ tso->what_next = ThreadEnterGHC;
+ IF_DEBUG(sanity, checkTSO(tso));
return;
}
ap->fun = (StgClosure *)sp[0];
sp++;
for(i=0; i < (nat)words; ++i) {
- ap->payload[i] = (P_)*sp++;
+ ap->payload[i] = (StgClosure *)*sp++;
}
switch (get_itbl(su)->type) {
case UPDATE_FRAME:
{
- SET_HDR(ap,&AP_UPD_info,su->header.prof.ccs /* ToDo */);
+ SET_HDR(ap,&stg_AP_UPD_info,su->header.prof.ccs /* ToDo */);
TICK_ALLOC_UP_THK(words+1,0);
IF_DEBUG(scheduler,
/* We want a PAP, not an AP_UPD. Fortunately, the
* layout's the same.
*/
- SET_HDR(ap,&PAP_info,su->header.prof.ccs /* ToDo */);
+ SET_HDR(ap,&stg_PAP_info,su->header.prof.ccs /* ToDo */);
TICK_ALLOC_UPD_PAP(words+1,0);
/* now build o = FUN(catch,ap,handler) */
o = (StgClosure *)allocate(sizeofW(StgClosure)+2);
TICK_ALLOC_FUN(2,0);
- SET_HDR(o,&catch_info,su->header.prof.ccs /* ToDo */);
+ SET_HDR(o,&stg_catch_info,su->header.prof.ccs /* ToDo */);
o->payload[0] = (StgClosure *)ap;
o->payload[1] = cf->handler;
StgSeqFrame *sf = (StgSeqFrame *)su;
StgClosure* o;
- SET_HDR(ap,&PAP_info,su->header.prof.ccs /* ToDo */);
+ SET_HDR(ap,&stg_PAP_info,su->header.prof.ccs /* ToDo */);
TICK_ALLOC_UPD_PAP(words+1,0);
/* now build o = FUN(seq,ap) */
o = (StgClosure *)allocate(sizeofW(StgClosure)+1);
TICK_ALLOC_SE_THK(1,0);
- SET_HDR(o,&seq_info,su->header.prof.ccs /* ToDo */);
- payloadCPtr(o,0) = (StgClosure *)ap;
+ SET_HDR(o,&stg_seq_info,su->header.prof.ccs /* ToDo */);
+ o->payload[0] = (StgClosure *)ap;
IF_DEBUG(scheduler,
fprintf(stderr, "scheduler: Built ");
/* We've stripped the entire stack, the thread is now dead. */
sp += sizeofW(StgStopFrame) - 1;
sp[0] = (W_)exception; /* save the exception */
- tso->whatNext = ThreadKilled;
+ tso->what_next = ThreadKilled;
tso->su = (StgUpdateFrame *)(sp+1);
tso->sp = sp;
return;
-
+
default:
barf("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.
+ * -------------------------------------------------------------------------- */
+
+static void
+detectBlackHoles( void )
+{
+ StgTSO *t = all_threads;
+ StgUpdateFrame *frame;
+ StgClosure *blocked_on;
+
+ for (t = all_threads; t != END_TSO_QUEUE; t = t->global_link) {
+
+ if (t->why_blocked != BlockedOnBlackHole) {
+ continue;
+ }
+
+ blocked_on = t->block_info.closure;
+
+ for (frame = t->su; ; frame = frame->link) {
+ switch (get_itbl(frame)->type) {
+
+ case UPDATE_FRAME:
+ if (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", t->id));
+ raiseAsync(t, (StgClosure *)NonTermination_closure);
+ goto done;
+ }
+ else {
+ continue;
+ }
+
+ case CATCH_FRAME:
+ case SEQ_FRAME:
+ continue;
+
+ case STOP_FRAME:
+ break;
+ }
+ break;
+ }
+
+ done: ;
+ }
+}
+
//@node Debugging Routines, Index, Exception Handling Routines, Main scheduling code
//@subsection Debugging Routines
{
switch (tso->why_blocked) {
case BlockedOnRead:
- fprintf(stderr,"blocked on read from fd %d", tso->block_info.fd);
+ fprintf(stderr,"is blocked on read from fd %d", tso->block_info.fd);
break;
case BlockedOnWrite:
- fprintf(stderr,"blocked on write to fd %d", tso->block_info.fd);
+ fprintf(stderr,"is blocked on write to fd %d", tso->block_info.fd);
break;
case BlockedOnDelay:
- fprintf(stderr,"blocked on delay of %d ms", tso->block_info.delay);
+ fprintf(stderr,"is blocked until %d", tso->block_info.target);
break;
case BlockedOnMVar:
- fprintf(stderr,"blocked on an MVar");
+ fprintf(stderr,"is blocked on an MVar");
break;
case BlockedOnException:
- fprintf(stderr,"blocked on delivering an exception to thread %d",
+ fprintf(stderr,"is blocked on delivering an exception to thread %d",
tso->block_info.tso->id);
break;
case BlockedOnBlackHole:
- fprintf(stderr,"blocked on a black hole");
+ fprintf(stderr,"is blocked on a black hole");
break;
case NotBlocked:
- fprintf(stderr,"not blocked");
+ fprintf(stderr,"is not blocked");
break;
#if defined(PAR)
case BlockedOnGA:
- fprintf(stderr,"blocked on global address");
+ fprintf(stderr,"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)",
+ tso->block_info.closure, info_type(tso->block_info.closure));
break;
#endif
+ default:
+ barf("printThreadBlockage: strange tso->why_blocked: %d for TSO %d (%d)",
+ tso->why_blocked, tso->id, tso);
}
}
void
printThreadStatus(StgTSO *tso)
{
- switch (tso->whatNext) {
+ switch (tso->what_next) {
case ThreadKilled:
fprintf(stderr,"has been killed");
break;
sched_belch("all threads:");
for (t = all_threads; t != END_TSO_QUEUE; t = t->global_link) {
- fprintf(stderr, "\tthread %d is ", t->id);
+ fprintf(stderr, "\tthread %d ", t->id);
printThreadStatus(t);
fprintf(stderr,"\n");
}
break;
case CONSTR:
fprintf(stderr," %s (IP %p),",
- (get_itbl(bqe) == &RBH_Save_0_info ? "RBH_Save_0" :
- get_itbl(bqe) == &RBH_Save_1_info ? "RBH_Save_1" :
- get_itbl(bqe) == &RBH_Save_2_info ? "RBH_Save_2" :
+ (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" :
"RBH_Save_?"), get_itbl(bqe));
break;
default:
print_bq (StgClosure *node)
{
StgBlockingQueueElement *bqe;
- StgTSO *tso;
PEs node_loc, tso_loc;
rtsBool end;
!end; // iterate until bqe points to a CONSTR
end = (get_itbl(bqe)->type == CONSTR) || (bqe->link==END_BQ_QUEUE), bqe = end ? END_BQ_QUEUE : bqe->link) {
ASSERT(bqe != END_BQ_QUEUE); // sanity check
- ASSERT(bqe != (StgTSO*)NULL); // sanity check
+ ASSERT(bqe != (StgBlockingQueueElement *)NULL); // sanity check
/* types of closures that may appear in a blocking queue */
ASSERT(get_itbl(bqe)->type == TSO ||
get_itbl(bqe)->type == CONSTR);
tso_loc = where_is((StgClosure *)bqe);
switch (get_itbl(bqe)->type) {
case TSO:
- fprintf(stderr," TSO %d (%x) on [PE %d],",
- ((StgTSO *)bqe)->id, ((StgTSO *)bqe), tso_loc);
+ fprintf(stderr," TSO %d (%p) on [PE %d],",
+ ((StgTSO *)bqe)->id, (StgTSO *)bqe, tso_loc);
break;
case CONSTR:
fprintf(stderr," %s (IP %p),",
- (get_itbl(bqe) == &RBH_Save_0_info ? "RBH_Save_0" :
- get_itbl(bqe) == &RBH_Save_1_info ? "RBH_Save_1" :
- get_itbl(bqe) == &RBH_Save_2_info ? "RBH_Save_2" :
+ (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" :
"RBH_Save_?"), get_itbl(bqe));
break;
default:
barf("Unexpected closure type %s in blocking queue of %p (%s)",
- info_type(bqe), node, info_type(node));
+ info_type((StgClosure *)bqe), node, info_type(node));
break;
}
} /* for */
#endif /* DEBUG */
+
//@node Index, , Debugging Routines, Main scheduling code
//@subsection Index
projects / ghc-hetmet.git / blobdiff