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| | /* System thread definitions
Copyright (C) 2012 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <setjmp.h>
#include "lisp.h"
#ifdef HAVE_PTHREAD
#include <sched.h>
void
sys_mutex_init (sys_mutex_t *mutex)
{
pthread_mutex_init (mutex, NULL);
}
void
sys_mutex_lock (sys_mutex_t *mutex)
{
pthread_mutex_lock (mutex);
}
void
sys_mutex_unlock (sys_mutex_t *mutex)
{
pthread_mutex_unlock (mutex);
}
void
sys_mutex_destroy (sys_mutex_t *mutex)
{
pthread_mutex_destroy (mutex);
}
void
sys_cond_init (sys_cond_t *cond)
{
pthread_cond_init (cond, NULL);
}
void
sys_cond_wait (sys_cond_t *cond, sys_mutex_t *mutex)
{
pthread_cond_wait (cond, mutex);
}
void
sys_cond_signal (sys_cond_t *cond)
{
pthread_cond_signal (cond);
}
void
sys_cond_broadcast (sys_cond_t *cond)
{
pthread_cond_broadcast (cond);
}
void
sys_cond_destroy (sys_cond_t *cond)
{
pthread_cond_destroy (cond);
}
void
lisp_mutex_init (lisp_mutex_t *mutex)
{
mutex->owner = NULL;
mutex->count = 0;
/* A lisp "mutex" is really a condition variable. */
pthread_cond_init (&mutex->condition, NULL);
}
void
lisp_mutex_lock (lisp_mutex_t *mutex)
{
struct thread_state *self;
if (mutex->owner == NULL)
{
mutex->owner = current_thread;
mutex->count = 1;
return;
}
if (mutex->owner == current_thread)
{
++mutex->count;
return;
}
self = current_thread;
while (mutex->owner != NULL /* && EQ (self->error_symbol, Qnil) */)
pthread_cond_wait (&mutex->condition, &global_lock);
#if 0
if (!EQ (self->error_symbol, Qnil))
{
Lisp_Object error_symbol = self->error_symbol;
Lisp_Object data = self->error_data;
self->error_symbol = Qnil;
self->error_data = Qnil;
Fsignal (error_symbol, error_data);
}
#endif
mutex->owner = self;
mutex->count = 1;
}
void
lisp_mutex_unlock (lisp_mutex_t *mutex)
{
struct thread_state *self = current_thread;
if (mutex->owner != current_thread)
error ("blah");
if (--mutex->count > 0)
return;
mutex->owner = NULL;
pthread_cond_broadcast (&mutex->condition);
post_acquire_global_lock (self);
}
void
lisp_mutex_destroy (lisp_mutex_t *mutex)
{
sys_cond_destroy (&mutex->condition);
}
sys_thread_t
sys_thread_self (void)
{
return pthread_self ();
}
int
sys_thread_equal (sys_thread_t one, sys_thread_t two)
{
return pthread_equal (one, two);
}
int
sys_thread_create (sys_thread_t *thread_ptr, thread_creation_function *func,
void *arg)
{
return pthread_create (thread_ptr, NULL, func, arg) == 0;
}
void
sys_thread_yield (void)
{
sched_yield ();
}
#else
#error port me
#endif
|