X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FSchedule.h;h=6751144be801afd9fe903be22f77169956346203;hb=21eeb926c8bf398e38919429d2375b78be45b14b;hp=edbe246ed326be74915798735dfcd7d924c613a2;hpb=90d88088ee8b3697ce68f7b1e07506bc4f33687d;p=ghc-hetmet.git diff --git a/rts/Schedule.h b/rts/Schedule.h index edbe246..6751144 100644 --- a/rts/Schedule.h +++ b/rts/Schedule.h @@ -10,15 +10,19 @@ #ifndef SCHEDULE_H #define SCHEDULE_H -#include "OSThreads.h" +#include "rts/OSThreads.h" #include "Capability.h" +#include "Trace.h" + +BEGIN_RTS_PRIVATE /* initScheduler(), exitScheduler() * Called from STG : no * Locks assumed : none */ void initScheduler (void); -void exitScheduler (void); +void exitScheduler (rtsBool wait_foreign); +void freeScheduler (void); // Place a new thread on the run queue of the current Capability void scheduleThread (Capability *cap, StgTSO *tso); @@ -28,89 +32,30 @@ void scheduleThread (Capability *cap, StgTSO *tso); // the desired Capability). void scheduleThreadOn(Capability *cap, StgWord cpu, StgTSO *tso); -/* awakenBlockedQueue() - * - * Takes a pointer to the beginning of a blocked TSO queue, and - * wakes up the entire queue. - * Called from STG : yes - * Locks assumed : none +/* wakeUpRts() + * + * Causes an OS thread to wake up and run the scheduler, if necessary. */ -#if defined(GRAN) -void awakenBlockedQueue(StgBlockingQueueElement *q, StgClosure *node); -#elif defined(PAR) -void awakenBlockedQueue(StgBlockingQueueElement *q, StgClosure *node); -#else -void awakenBlockedQueue (Capability *cap, StgTSO *tso); +#if defined(THREADED_RTS) +void wakeUpRts(void); #endif -/* unblockOne() - * - * Put the specified thread on the run queue of the given Capability. - * Called from STG : yes - * Locks assumed : we own the Capability. - */ -StgTSO * unblockOne(Capability *cap, StgTSO *tso); - -/* raiseAsync() - * - * Raises an exception asynchronously in the specified thread. - * - * Called from STG : yes - * Locks assumed : none - */ -void raiseAsync(Capability *cap, StgTSO *tso, StgClosure *exception); - -/* suspendComputation() - * - * A variant of raiseAsync(), this strips the stack of the specified - * thread down to the stop_here point, leaving a current closure on - * top of the stack at [stop_here - 1]. - */ -void suspendComputation(Capability *cap, StgTSO *tso, StgPtr stop_here); - /* raiseExceptionHelper */ StgWord raiseExceptionHelper (StgRegTable *reg, StgTSO *tso, StgClosure *exception); /* findRetryFrameHelper */ StgWord findRetryFrameHelper (StgTSO *tso); -/* GetRoots(evac_fn f) - * - * Call f() for each root known to the scheduler. - * - * Called from STG : NO - * Locks assumed : ???? - */ -void GetRoots(evac_fn); - /* workerStart() * * Entry point for a new worker task. * Called from STG : NO * Locks assumed : none */ -void workerStart(Task *task); - -#if defined(GRAN) -void awaken_blocked_queue(StgBlockingQueueElement *q, StgClosure *node); -void unlink_from_bq(StgTSO* tso, StgClosure* node); -void initThread(StgTSO *tso, nat stack_size, StgInt pri); -#elif defined(PAR) -nat run_queue_len(void); -void awaken_blocked_queue(StgBlockingQueueElement *q, StgClosure *node); -void initThread(StgTSO *tso, nat stack_size); -#else -char *info_type(StgClosure *closure); // dummy -char *info_type_by_ip(StgInfoTable *ip); // dummy -void awaken_blocked_queue(StgTSO *q); -void initThread(StgTSO *tso, nat stack_size); +#if defined(THREADED_RTS) +void OSThreadProcAttr workerStart(Task *task); #endif -/* Context switch flag. - * Locks required : none (conflicts are harmless) - */ -extern int RTS_VAR(context_switch); - /* The state of the scheduler. This is used to control the sequence * of events during shutdown, and when the runtime is interrupted * using ^C. @@ -119,7 +64,7 @@ extern int RTS_VAR(context_switch); #define SCHED_INTERRUPTING 1 /* ^C detected, before threads are deleted */ #define SCHED_SHUTTING_DOWN 2 /* final shutdown */ -extern rtsBool RTS_VAR(sched_state); +extern volatile StgWord sched_state; /* * flag that tracks whether we have done any execution in this time slice. @@ -135,28 +80,19 @@ extern rtsBool RTS_VAR(sched_state); * INACTIVE to DONE_GC happens under sched_mutex. No lock required * to set it to ACTIVITY_YES. */ -extern nat recent_activity; +extern volatile StgWord recent_activity; /* Thread queues. * Locks required : sched_mutex * * In GranSim we have one run/blocked_queue per PE. */ -#if defined(GRAN) -// run_queue_hds defined in GranSim.h -#else -extern StgTSO *RTS_VAR(blackhole_queue); +extern StgTSO *blackhole_queue; #if !defined(THREADED_RTS) -extern StgTSO *RTS_VAR(blocked_queue_hd), *RTS_VAR(blocked_queue_tl); -extern StgTSO *RTS_VAR(sleeping_queue); -#endif +extern StgTSO *blocked_queue_hd, *blocked_queue_tl; +extern StgTSO *sleeping_queue; #endif -/* Linked list of all threads. - * Locks required : sched_mutex - */ -extern StgTSO *RTS_VAR(all_threads); - /* Set to rtsTrue if there are threads on the blackhole_queue, and * it is possible that one or more of them may be available to run. * This flag is set to rtsFalse after we've checked the queue, and @@ -166,33 +102,17 @@ extern StgTSO *RTS_VAR(all_threads); */ extern rtsBool blackholes_need_checking; +extern rtsBool heap_overflow; + #if defined(THREADED_RTS) -extern Mutex RTS_VAR(sched_mutex); +extern Mutex sched_mutex; #endif -StgBool isThreadBound(StgTSO *tso); - -SchedulerStatus rts_mainLazyIO(HaskellObj p, /*out*/HaskellObj *ret); - /* Called by shutdown_handler(). */ void interruptStgRts (void); -nat run_queue_len (void); - void resurrectThreads (StgTSO *); - -void printAllThreads(void); - -/* debugging only - */ -#ifdef DEBUG -void print_bq (StgClosure *node); -#endif -#if defined(PAR) -void print_bqe (StgBlockingQueueElement *bqe); -#endif - -void labelThread(StgPtr tso, char *label); +void performPendingThrowTos (StgTSO *); /* ----------------------------------------------------------------------------- * Some convenient macros/inline functions... @@ -206,26 +126,29 @@ void labelThread(StgPtr tso, char *label); * NOTE: tso->link should be END_TSO_QUEUE before calling this macro. * ASSUMES: cap->running_task is the current task. */ -STATIC_INLINE void +EXTERN_INLINE void +appendToRunQueue (Capability *cap, StgTSO *tso); + +EXTERN_INLINE void appendToRunQueue (Capability *cap, StgTSO *tso) { - ASSERT(tso->link == END_TSO_QUEUE); + ASSERT(tso->_link == END_TSO_QUEUE); if (cap->run_queue_hd == END_TSO_QUEUE) { cap->run_queue_hd = tso; } else { - cap->run_queue_tl->link = tso; + setTSOLink(cap, cap->run_queue_tl, tso); } cap->run_queue_tl = tso; + traceEventThreadRunnable (cap, tso); } -/* Push a thread on the beginning of the run queue. Used for - * newly awakened threads, so they get run as soon as possible. +/* Push a thread on the beginning of the run queue. * ASSUMES: cap->running_task is the current task. */ -STATIC_INLINE void +INLINE_HEADER void pushOnRunQueue (Capability *cap, StgTSO *tso) { - tso->link = cap->run_queue_hd; + setTSOLink(cap, tso, cap->run_queue_hd); cap->run_queue_hd = tso; if (cap->run_queue_tl == END_TSO_QUEUE) { cap->run_queue_tl = tso; @@ -234,13 +157,13 @@ pushOnRunQueue (Capability *cap, StgTSO *tso) /* Pop the first thread off the runnable queue. */ -STATIC_INLINE StgTSO * +INLINE_HEADER StgTSO * popRunQueue (Capability *cap) { StgTSO *t = cap->run_queue_hd; ASSERT(t != END_TSO_QUEUE); - cap->run_queue_hd = t->link; - t->link = END_TSO_QUEUE; + cap->run_queue_hd = t->_link; + t->_link = END_TSO_QUEUE; // no write barrier req'd if (cap->run_queue_hd == END_TSO_QUEUE) { cap->run_queue_tl = END_TSO_QUEUE; } @@ -250,49 +173,54 @@ popRunQueue (Capability *cap) /* Add a thread to the end of the blocked queue. */ #if !defined(THREADED_RTS) -STATIC_INLINE void +INLINE_HEADER void appendToBlockedQueue(StgTSO *tso) { - ASSERT(tso->link == END_TSO_QUEUE); + ASSERT(tso->_link == END_TSO_QUEUE); if (blocked_queue_hd == END_TSO_QUEUE) { blocked_queue_hd = tso; } else { - blocked_queue_tl->link = tso; + setTSOLink(&MainCapability, blocked_queue_tl, tso); } blocked_queue_tl = tso; } #endif #if defined(THREADED_RTS) -STATIC_INLINE void -appendToWakeupQueue (Capability *cap, StgTSO *tso) +// Assumes: my_cap is owned by the current Task. We hold +// other_cap->lock, but we do not necessarily own other_cap; another +// Task may be running on it. +INLINE_HEADER void +appendToWakeupQueue (Capability *my_cap, Capability *other_cap, StgTSO *tso) { - ASSERT(tso->link == END_TSO_QUEUE); - if (cap->wakeup_queue_hd == END_TSO_QUEUE) { - cap->wakeup_queue_hd = tso; + ASSERT(tso->_link == END_TSO_QUEUE); + if (other_cap->wakeup_queue_hd == END_TSO_QUEUE) { + other_cap->wakeup_queue_hd = tso; } else { - cap->wakeup_queue_tl->link = tso; + // my_cap is passed to setTSOLink() because it may need to + // write to the mutable list. + setTSOLink(my_cap, other_cap->wakeup_queue_tl, tso); } - cap->wakeup_queue_tl = tso; + other_cap->wakeup_queue_tl = tso; } #endif /* Check whether various thread queues are empty */ -STATIC_INLINE rtsBool +INLINE_HEADER rtsBool emptyQueue (StgTSO *q) { return (q == END_TSO_QUEUE); } -STATIC_INLINE rtsBool +INLINE_HEADER rtsBool emptyRunQueue(Capability *cap) { return emptyQueue(cap->run_queue_hd); } #if defined(THREADED_RTS) -STATIC_INLINE rtsBool +INLINE_HEADER rtsBool emptyWakeupQueue(Capability *cap) { return emptyQueue(cap->wakeup_queue_hd); @@ -304,7 +232,7 @@ emptyWakeupQueue(Capability *cap) #define EMPTY_SLEEPING_QUEUE() (emptyQueue(sleeping_queue)) #endif -STATIC_INLINE rtsBool +INLINE_HEADER rtsBool emptyThreadQueues(Capability *cap) { return emptyRunQueue(cap) @@ -314,18 +242,9 @@ emptyThreadQueues(Capability *cap) ; } -#ifdef DEBUG -void sched_belch(char *s, ...) - GNU_ATTRIBUTE(format (printf, 1, 2)); -#endif - #endif /* !IN_STG_CODE */ -STATIC_INLINE void -dirtyTSO (StgTSO *tso) -{ - tso->flags |= TSO_DIRTY; -} +END_RTS_PRIVATE #endif /* SCHEDULE_H */