/* -----------------------------------------------------------------------------
- * $Id: Schedule.h,v 1.17 2000/03/31 03:09:36 hwloidl Exp $
*
* (c) The GHC Team 1998-1999
*
*
* -------------------------------------------------------------------------*/
-//@menu
-//* Scheduler Functions::
-//* Scheduler Vars and Data Types::
-//* Some convenient macros::
-//* Index::
-//@end menu
+#ifndef __SCHEDULE_H__
+#define __SCHEDULE_H__
+#include "OSThreads.h"
-//@node Scheduler Functions, Scheduler Vars and Data Types
-//@subsection Scheduler Functions
-
-//@cindex initScheduler
-//@cindex exitScheduler
-//@cindex startTasks
/* 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 );
-//@cindex awakenBlockedQueue
/* awakenBlockedQueue()
*
* Takes a pointer to the beginning of a blocked TSO queue, and
#elif defined(PAR)
void awakenBlockedQueue(StgBlockingQueueElement *q, StgClosure *node);
#else
-void awakenBlockedQueue(StgTSO *tso);
+void awakenBlockedQueue (StgTSO *tso);
+void awakenBlockedQueueNoLock (StgTSO *tso);
#endif
-//@cindex unblockOne
/* unblockOne()
*
* Takes a pointer to the beginning of a blocked TSO queue, and
StgTSO *unblockOne(StgTSO *tso);
#endif
-//@cindex raiseAsync
/* raiseAsync()
*
* Raises an exception asynchronously in the specified thread.
* Locks assumed : none
*/
void raiseAsync(StgTSO *tso, StgClosure *exception);
+void raiseAsyncWithLock(StgTSO *tso, StgClosure *exception);
+
+/* raiseExceptionHelper */
+StgWord raiseExceptionHelper (StgTSO *tso, StgClosure *exception);
-//@cindex awaitEvent
-/* 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 */
+/* wakeUpSleepingThreads(nat ticks)
+ *
+ * Wakes up any sleeping threads whose timers have expired.
+ *
+ * Called from STG : NO
+ * Locks assumed : sched_mutex
+ */
+rtsBool wakeUpSleepingThreads(nat); /* In Select.c */
+
+/* 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 */
+
+/* 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()
+ */
+void resetWorkerWakeupPipeAfterFork(void); /* In Select.c */
+
+/* GetRoots(evac_fn f)
+ *
+ * Call f() for each root known to the scheduler.
+ *
+ * Called from STG : NO
+ * Locks assumed : ????
+ */
+void GetRoots(evac_fn);
+
// ToDo: check whether all fcts below are used in the SMP version, too
-//@cindex awaken_blocked_queue
#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);
#endif
-//@node Scheduler Vars and Data Types, Some convenient macros, Scheduler Functions
-//@subsection Scheduler Vars and Data Types
-
-//@cindex context_switch
/* Context switch flag.
* Locks required : sched_mutex
*/
-extern nat context_switch;
-extern rtsBool interrupted;
-
-extern nat ticks_since_select;
-
-//@cindex Capability
-/* Capability type
- */
-typedef StgRegTable Capability;
+extern nat RTS_VAR(context_switch);
+extern rtsBool RTS_VAR(interrupted);
-/* Free capability list.
- * Locks required: sched_mutex.
- */
-#ifdef SMP
-extern Capability *free_capabilities;
-extern nat n_free_capabilities;
-#else
-extern Capability MainRegTable;
-#endif
+/* In Select.c */
+extern nat RTS_VAR(timestamp);
/* Thread queues.
* Locks required : sched_mutex
#if defined(GRAN)
// run_queue_hds defined in GranSim.h
#else
-extern StgTSO *run_queue_hd, *run_queue_tl;
-extern StgTSO *blocked_queue_hd, *blocked_queue_tl;
+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 *all_threads;
-
-#ifdef SMP
-//@cindex sched_mutex
-//@cindex thread_ready_cond
-//@cindex gc_pending_cond
-extern pthread_mutex_t sched_mutex;
-extern pthread_cond_t thread_ready_cond;
-extern pthread_cond_t gc_pending_cond;
-#endif
+extern StgTSO *RTS_VAR(all_threads);
-//@cindex task_info
-#ifdef SMP
-typedef struct {
- pthread_t id;
- double elapsedtimestart;
- double mut_time;
- double mut_etime;
- double gc_time;
- double gc_etime;
-} task_info;
-
-extern task_info *task_ids;
+#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
-/* Needed by Hugs.
- */
+StgBool isThreadBound(StgTSO *tso);
+
+extern SchedulerStatus rts_mainLazyIO(HaskellObj p, /*out*/HaskellObj *ret);
+
+
+/* Called by shutdown_handler(). */
void interruptStgRts ( void );
void raiseAsync(StgTSO *tso, StgClosure *exception);
void resurrectThreads( StgTSO * );
-//@node Some convenient macros, Index, Scheduler Vars and Data Types
-//@subsection Some convenient macros
+/* 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;
-/* debugging only
+/* Main thread queue.
+ * Locks required: sched_mutex.
*/
-#ifdef DEBUG
-void printThreadBlockage(StgTSO *tso);
-void printThreadStatus(StgTSO *tso);
+extern StgMainThread *main_threads;
+
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...
*/
-/* this is the NIL ptr for a TSO queue (e.g. runnable queue) */
-#define END_TSO_QUEUE ((StgTSO *)(void*)&END_TSO_QUEUE_closure)
-/* this is the NIL ptr for a list CAFs */
-#define END_CAF_LIST ((StgCAF *)(void*)&END_TSO_QUEUE_closure)
-#if defined(PAR) || defined(GRAN)
-/* this is the NIL ptr for a blocking queue */
-# define END_BQ_QUEUE ((StgBlockingQueueElement *)(void*)&END_TSO_QUEUE_closure)
-/* this is the NIL ptr for a blocked fetch queue (as in PendingFetches in GUM) */
-# define END_BF_QUEUE ((StgBlockedFetch *)(void*)&END_TSO_QUEUE_closure)
-#endif
+/* END_TSO_QUEUE and friends now defined in includes/StgMiscClosures.h */
-//@cindex APPEND_TO_RUN_QUEUE
/* Add a thread to the end of the run queue.
* NOTE: tso->link should be END_TSO_QUEUE before calling this macro.
*/
} \
run_queue_tl = tso;
-//@cindex PUSH_ON_RUN_QUEUE
/* Push a thread on the beginning of the run queue. Used for
* newly awakened threads, so they get run as soon as possible.
*/
run_queue_tl = tso; \
}
-//@cindex POP_RUN_QUEUE
/* 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)
-//@cindex APPEND_TO_BLOCKED_QUEUE
/* Add a thread to the end of the blocked queue.
*/
#define APPEND_TO_BLOCKED_QUEUE(tso) \
} \
blocked_queue_tl = tso;
-//@cindex THREAD_RUNNABLE
-/* Signal that a runnable thread has become available, in
- * case there are any waiting tasks to execute it.
+/* Check whether various thread queues are empty
*/
-#ifdef SMP
-#define THREAD_RUNNABLE() \
- if (free_capabilities != NULL) { \
- pthread_cond_signal(&thread_ready_cond); \
- } \
- context_switch = 1;
-#else
-#define THREAD_RUNNABLE() /* nothing */
+#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, ...)
+ GNU_ATTRIBUTE(format (printf, 1, 2));
#endif
-//@node Index, , Some convenient macros
-//@subsection Index
-
-//@index
-//* APPEND_TO_BLOCKED_QUEUE:: @cindex\s-+APPEND_TO_BLOCKED_QUEUE
-//* APPEND_TO_RUN_QUEUE:: @cindex\s-+APPEND_TO_RUN_QUEUE
-//* Capability:: @cindex\s-+Capability
-//* POP_RUN_QUEUE :: @cindex\s-+POP_RUN_QUEUE
-//* PUSH_ON_RUN_QUEUE:: @cindex\s-+PUSH_ON_RUN_QUEUE
-//* THREAD_RUNNABLE:: @cindex\s-+THREAD_RUNNABLE
-//* awaitEvent:: @cindex\s-+awaitEvent
-//* awakenBlockedQueue:: @cindex\s-+awakenBlockedQueue
-//* awaken_blocked_queue:: @cindex\s-+awaken_blocked_queue
-//* context_switch:: @cindex\s-+context_switch
-//* exitScheduler:: @cindex\s-+exitScheduler
-//* gc_pending_cond:: @cindex\s-+gc_pending_cond
-//* initScheduler:: @cindex\s-+initScheduler
-//* raiseAsync:: @cindex\s-+raiseAsync
-//* sched_mutex:: @cindex\s-+sched_mutex
-//* startTasks:: @cindex\s-+startTasks
-//* task_info:: @cindex\s-+task_info
-//* thread_ready_cond:: @cindex\s-+thread_ready_cond
-//* unblockOne:: @cindex\s-+unblockOne
-//@end index
+#endif /* __SCHEDULE_H__ */
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