X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Frts%2FSchedule.h;h=588ddc52b1bbc9baac3ef8069df9f6deb93ac2d2;hb=423d477bfecd490de1449c59325c8776f91d7aac;hp=085ad22db85ebe3bf5411bdde222e2eb84afb61d;hpb=f6692611aad945e46ffb615bde1df7def3fc742f;p=ghc-hetmet.git diff --git a/ghc/rts/Schedule.h b/ghc/rts/Schedule.h index 085ad22..588ddc5 100644 --- a/ghc/rts/Schedule.h +++ b/ghc/rts/Schedule.h @@ -1,23 +1,23 @@ /* ----------------------------------------------------------------------------- - * $Id: Schedule.h,v 1.9 1999/11/02 15:06:02 simonmar Exp $ * * (c) The GHC Team 1998-1999 * * Prototypes for functions in Schedule.c * (RTS internal scheduler interface) * - * ---------------------------------------------------------------------------*/ + * -------------------------------------------------------------------------*/ + +#ifndef __SCHEDULE_H__ +#define __SCHEDULE_H__ +#include "OSThreads.h" /* initScheduler(), exitScheduler(), startTasks() * * Called from STG : no * Locks assumed : none */ -void initScheduler( void ); -void exitScheduler( void ); -#ifdef SMP -void startTasks( void ); -#endif +extern void initScheduler ( void ); +extern void exitScheduler ( void ); /* awakenBlockedQueue() * @@ -27,7 +27,14 @@ void startTasks( void ); * Called from STG : yes * Locks assumed : none */ -void awakenBlockedQueue(StgTSO *tso); +#if defined(GRAN) +void awakenBlockedQueue(StgBlockingQueueElement *q, StgClosure *node); +#elif defined(PAR) +void awakenBlockedQueue(StgBlockingQueueElement *q, StgClosure *node); +#else +void awakenBlockedQueue (StgTSO *tso); +void awakenBlockedQueueNoLock (StgTSO *tso); +#endif /* unblockOne() * @@ -37,7 +44,11 @@ void awakenBlockedQueue(StgTSO *tso); * Called from STG : yes * Locks assumed : none */ +#if defined(GRAN) || defined(PAR) +StgBlockingQueueElement *unblockOne(StgBlockingQueueElement *bqe, StgClosure *node); +#else StgTSO *unblockOne(StgTSO *tso); +#endif /* raiseAsync() * @@ -47,70 +58,181 @@ StgTSO *unblockOne(StgTSO *tso); * Locks assumed : none */ void raiseAsync(StgTSO *tso, StgClosure *exception); +void raiseAsyncWithLock(StgTSO *tso, StgClosure *exception); + +/* raiseExceptionHelper */ +StgWord raiseExceptionHelper (StgTSO *tso, StgClosure *exception); -/* awaitEvent() +/* awaitEvent(rtsBool wait) * - * Raises an exception asynchronously in the specified thread. + * Checks for blocked threads that need to be woken. * * Called from STG : NO * Locks assumed : sched_mutex */ void awaitEvent(rtsBool wait); /* In Select.c */ -/* Context switch flag. - * Locks required : sched_mutex +/* wakeUpSleepingThreads(nat ticks) + * + * Wakes up any sleeping threads whose timers have expired. + * + * Called from STG : NO + * Locks assumed : sched_mutex */ -extern nat context_switch; +rtsBool wakeUpSleepingThreads(nat); /* In Select.c */ -extern nat ticks_since_select; +/* wakeBlockedWorkerThread() + * + * If a worker thread is currently blocked in awaitEvent(), interrupt it. + * + * Called from STG : NO + * Locks assumed : sched_mutex + */ +void wakeBlockedWorkerThread(void); /* In Select.c */ -/* Capability type +/* resetWorkerWakeupPipeAfterFork() + * + * Notify Select.c that a fork() has occured + * + * Called from STG : NO + * Locks assumed : don't care, but must be called right after fork() */ -typedef StgRegTable Capability; +void resetWorkerWakeupPipeAfterFork(void); /* In Select.c */ -/* Free capability list. - * Locks required: sched_mutex. +/* GetRoots(evac_fn f) + * + * Call f() for each root known to the scheduler. + * + * Called from STG : NO + * Locks assumed : ???? */ -#ifdef SMP -extern Capability *free_capabilities; -extern nat n_free_capabilities; +void GetRoots(evac_fn); + +// ToDo: check whether all fcts below are used in the SMP version, too +#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 -extern Capability MainRegTable; +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); #endif +/* Context switch flag. + * Locks required : sched_mutex + */ +extern nat RTS_VAR(context_switch); +extern rtsBool RTS_VAR(interrupted); + +/* In Select.c */ +extern nat RTS_VAR(timestamp); + /* Thread queues. * Locks required : sched_mutex + * + * In GranSim we have one run/blocked_queue per PE. */ -extern StgTSO *run_queue_hd, *run_queue_tl; -extern StgTSO *blocked_queue_hd, *blocked_queue_tl; +#if defined(GRAN) +// run_queue_hds defined in GranSim.h +#else +extern StgTSO *RTS_VAR(run_queue_hd), *RTS_VAR(run_queue_tl); +extern StgTSO *RTS_VAR(blocked_queue_hd), *RTS_VAR(blocked_queue_tl); +extern StgTSO *RTS_VAR(sleeping_queue); +#endif +/* Linked list of all threads. */ +extern StgTSO *RTS_VAR(all_threads); -#ifdef DEBUG -extern void printThreadBlockage(StgTSO *tso); +#if defined(RTS_SUPPORTS_THREADS) +/* Schedule.c has detailed info on what these do */ +extern Mutex RTS_VAR(sched_mutex); +extern Condition RTS_VAR(returning_worker_cond); +extern nat RTS_VAR(rts_n_waiting_workers); +extern nat RTS_VAR(rts_n_waiting_tasks); #endif -#ifdef SMP -extern pthread_mutex_t sched_mutex; -extern pthread_cond_t thread_ready_cond; -extern pthread_cond_t gc_pending_cond; +StgBool rtsSupportsBoundThreads(void); +StgBool isThreadBound(StgTSO *tso); +StgInt forkProcess(HsStablePtr *entry); + +extern SchedulerStatus rts_mainLazyIO(HaskellObj p, /*out*/HaskellObj *ret); + + +/* Called by shutdown_handler(). */ +void interruptStgRts ( void ); + +void raiseAsync(StgTSO *tso, StgClosure *exception); +nat run_queue_len(void); + +void resurrectThreads( StgTSO * ); + +/* Main threads: + * + * These are the threads which clients have requested that we run. + * + * In a 'threaded' build, each of these corresponds to one bound thread. + * The pointer to the StgMainThread is passed as a parameter to schedule; + * this invocation of schedule will always pass this main thread's + * bound_thread_cond to waitForkWorkCapability; OS-thread-switching + * takes place using passCapability. + * + * In non-threaded builds, clients are strictly nested: the first client calls + * into the RTS, which might call out again to C with a _ccall_GC, and + * eventually re-enter the RTS. + * + * This is non-abstract at the moment because the garbage collector + * treats pointers to TSOs from the main thread list as "weak" - these + * pointers won't prevent a thread from receiving a BlockedOnDeadMVar + * exception. + * + * Main threads information is kept in a linked list: + */ +typedef struct StgMainThread_ { + StgTSO * tso; + SchedulerStatus stat; + StgClosure ** ret; +#if defined(RTS_SUPPORTS_THREADS) +#if defined(THREADED_RTS) + Condition bound_thread_cond; +#else + Condition wakeup; #endif +#endif + struct StgMainThread_ *prev; + struct StgMainThread_ *link; +} StgMainThread; -#ifdef SMP -typedef struct { - pthread_t id; - double mut_time; - double gc_time; - double gc_etime; -} task_info; +/* Main thread queue. + * Locks required: sched_mutex. + */ +extern StgMainThread *main_threads; -extern task_info *task_ids; +void printAllThreads(void); +#ifdef COMPILING_SCHEDULER +static void printThreadBlockage(StgTSO *tso); +static void printThreadStatus(StgTSO *tso); +#endif +/* 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); + /* ----------------------------------------------------------------------------- * Some convenient macros... */ -#define END_TSO_QUEUE ((StgTSO *)(void*)&END_TSO_QUEUE_closure) -#define END_CAF_LIST ((StgCAF *)(void*)&END_TSO_QUEUE_closure) +/* END_TSO_QUEUE and friends now defined in includes/StgMiscClosures.h */ /* Add a thread to the end of the run queue. * NOTE: tso->link should be END_TSO_QUEUE before calling this macro. @@ -133,20 +255,20 @@ extern task_info *task_ids; if (run_queue_tl == END_TSO_QUEUE) { \ run_queue_tl = tso; \ } - + /* Pop the first thread off the runnable queue. */ -#define POP_RUN_QUEUE() \ - ({ StgTSO *t = run_queue_hd; \ - if (t != END_TSO_QUEUE) { \ - run_queue_hd = t->link; \ - t->link = END_TSO_QUEUE; \ +#define POP_RUN_QUEUE(pt) \ + do { StgTSO *__tmp_t = run_queue_hd; \ + if (__tmp_t != END_TSO_QUEUE) { \ + run_queue_hd = __tmp_t->link; \ + __tmp_t->link = END_TSO_QUEUE; \ if (run_queue_hd == END_TSO_QUEUE) { \ run_queue_tl = END_TSO_QUEUE; \ } \ } \ - t; \ - }) + pt = __tmp_t; \ + } while(0) /* Add a thread to the end of the blocked queue. */ @@ -162,13 +284,38 @@ extern task_info *task_ids; /* Signal that a runnable thread has become available, in * case there are any waiting tasks to execute it. */ -#ifdef SMP +#if defined(RTS_SUPPORTS_THREADS) #define THREAD_RUNNABLE() \ - if (free_capabilities != NULL) { \ - pthread_cond_signal(&thread_ready_cond); \ - } \ + wakeBlockedWorkerThread(); \ context_switch = 1; #else #define THREAD_RUNNABLE() /* nothing */ #endif +/* Check whether various thread queues are empty + */ +#define EMPTY_QUEUE(q) (q == END_TSO_QUEUE) + +#define EMPTY_RUN_QUEUE() (EMPTY_QUEUE(run_queue_hd)) +#define EMPTY_BLOCKED_QUEUE() (EMPTY_QUEUE(blocked_queue_hd)) +#define EMPTY_SLEEPING_QUEUE() (EMPTY_QUEUE(sleeping_queue)) + +#define EMPTY_THREAD_QUEUES() (EMPTY_RUN_QUEUE() && \ + EMPTY_BLOCKED_QUEUE() && \ + EMPTY_SLEEPING_QUEUE()) + +#if defined(RTS_SUPPORTS_THREADS) +/* If no task is waiting for a capability, + * and if there is work to be done + * or if we need to wait for IO or delay requests, + * spawn a new worker thread. + */ +void +startSchedulerTaskIfNecessary(void); +#endif + +#ifdef DEBUG +extern void sched_belch(char *s, ...); +#endif + +#endif /* __SCHEDULE_H__ */