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9086fa7771
static. It's only useful internally --- you should never just wait on a condition variable. * coop-defs.h (coop_condition_variable_wait): Delete prototype.
228 lines
6.9 KiB
C
228 lines
6.9 KiB
C
/* classes: h_files */
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#ifndef COOP_DEFSH
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#define COOP_DEFSH
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/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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# ifdef TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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# else
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# ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# ifdef HAVE_TIME_H
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# include <time.h>
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# endif
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# endif
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# endif
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#ifdef GUILE_ISELECT
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#include "iselect.h"
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#endif
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/* This file is included by threads.h, which, in turn, is included by
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libguile.h while coop-threads.h only is included by
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coop-threads.c. */
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/* The coop_t struct must be declared here, since macros in this file
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refer to the data member. */
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/* The notion of a thread is merged with the notion of a queue.
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Thread stuff: thread status (sp) and stuff to use during
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(re)initialization. Queue stuff: next thread in the queue
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(next). */
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struct qt_t;
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typedef struct coop_t {
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struct qt_t *sp; /* QuickThreads handle. */
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void *sto; /* `malloc'-allocated stack. */
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struct coop_t *next; /* Next thread in the queue. */
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struct coop_t *all_next;
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struct coop_t *all_prev;
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void *data; /* Thread local data */
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void *base; /* Base of stack */
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void *top; /* Top of stack */
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void *joining; /* A queue of threads waiting to join this
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thread */
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#ifdef GUILE_ISELECT
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int nfds;
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SELECT_TYPE *readfds;
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SELECT_TYPE *writefds;
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SELECT_TYPE *exceptfds;
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int timeoutp;
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struct timeval wakeup_time; /* Time to stop sleeping */
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int _errno;
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int retval;
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#else
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time_t wakeup_time; /* Time to stop sleeping */
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#endif
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} coop_t;
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/* A queue is a circular list of threads. The queue head is a
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designated list element. If this is a uniprocessor-only
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implementation we can store the `main' thread in this, but in a
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multiprocessor there are several `heavy' threads but only one run
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queue. A fancier implementation might have private run queues,
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which would lead to a simpler (trivial) implementation */
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typedef struct coop_q_t {
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coop_t t;
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coop_t *tail;
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} coop_q_t;
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/* A Mutex variable is made up of a owner thread, and a queue of threads
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waiting on the mutex */
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typedef struct coop_m {
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coop_t *owner; /* Mutex owner */
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coop_q_t waiting; /* Queue of waiting threads */
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} coop_m;
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typedef coop_m scm_mutex_t;
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extern int coop_mutex_init (coop_m*);
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extern int coop_mutex_lock (coop_m*);
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extern int coop_mutex_unlock (coop_m*);
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extern int coop_mutex_destroy (coop_m*);
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#define scm_mutex_init coop_mutex_init
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#define scm_mutex_lock coop_mutex_lock
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#define scm_mutex_unlock coop_mutex_unlock
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#define scm_mutex_destroy coop_mutex_destroy
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/* A Condition variable is made up of a list of threads waiting on the
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condition. */
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typedef struct coop_c {
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coop_q_t waiting; /* Queue of waiting threads */
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} coop_c;
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typedef coop_c scm_cond_t;
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extern int coop_condition_variable_init (coop_c*);
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extern int coop_condition_variable_wait_mutex (coop_c*, coop_m*);
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extern int coop_condition_variable_signal (coop_c*);
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extern int coop_condition_variable_destroy (coop_c*);
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#define scm_cond_init(cond, attr) coop_condition_variable_init (cond)
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#define scm_cond_wait coop_condition_variable_wait_mutex
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#define scm_cond_signal coop_condition_variable_signal
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#define scm_cond_destroy coop_condition_variable_destroy
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extern coop_t *coop_global_curr; /* Currently-executing thread. */
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extern void coop_join (coop_t *t);
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extern void coop_yield (void);
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extern size_t scm_switch_counter;
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extern size_t scm_thread_count;
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/* Some iselect functions. */
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/* I'm not sure whether these three declarations should be here.
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They're really defined in iselect.c, so you'd think they'd go in
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iselect.h, but they use coop_t, defined above, which uses things
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defined in iselect.h. Basically, we're making at best a flailing
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(and failing) attempt at modularity here, and I don't have time to
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rethink this at the moment. This code awaits a Hero. --JimB */
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extern coop_t *coop_next_runnable_thread (void);
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extern coop_t *coop_wait_for_runnable_thread_now (struct timeval *);
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extern coop_t *coop_wait_for_runnable_thread (void);
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/* Cooperative threads don't need to have these defined */
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#define SCM_THREAD_CRITICAL_SECTION_START
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#define SCM_THREAD_CRITICAL_SECTION_END
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#define SCM_NO_CRITICAL_SECTION_OWNER 0
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#define SCM_THREAD_SWITCH_COUNT 50 /* was 10 /mdj */
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#define SCM_THREAD_DEFER
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#define SCM_THREAD_ALLOW
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#define SCM_THREAD_REDEFER
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#define SCM_THREAD_REALLOW_1
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#define SCM_THREAD_REALLOW_2
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#if 0
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#define SCM_THREAD_SWITCHING_CODE \
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{ \
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if (scm_thread_count > 1) \
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coop_yield(); \
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} \
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#else
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#define SCM_THREAD_SWITCHING_CODE \
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{ \
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if (scm_thread_count > 1) \
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{ \
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scm_switch_counter--; \
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if (scm_switch_counter == 0) \
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{ \
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scm_switch_counter = SCM_THREAD_SWITCH_COUNT; \
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coop_yield(); \
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} \
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} \
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} \
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#endif
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#define SCM_THREAD_LOCAL_DATA (coop_global_curr->data)
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#define SCM_SET_THREAD_LOCAL_DATA(ptr) (coop_global_curr->data = (ptr))
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#endif /* COOP_DEFSH */
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