138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 1999 Richard Seaman, Jr.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Richard Seaman, Jr.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY RICHARD SEAMAN, Jr. AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#ifndef _THREAD_SAFE
|
|
#define _THREAD_SAFE
|
|
#endif
|
|
|
|
#include <dlfcn.h>
|
|
#include <stdlib.h>
|
|
#include "pthread.h"
|
|
/* Our internal pthreads definitions are here. Set as needed */
|
|
#if defined(COMPILING_UTHREADS)
|
|
#include "pthread_private.h"
|
|
#endif
|
|
#if defined(LINUXTHREADS)
|
|
#include <errno.h>
|
|
#include "internals.h"
|
|
#include "spinlock.h"
|
|
#else
|
|
/* Your internal definition here */
|
|
#endif
|
|
|
|
/* These are from lib/libc/include */
|
|
#if !defined(LINUXTHREADS)
|
|
#include "spinlock.h"
|
|
#endif
|
|
|
|
/* This is defined in lib/libc/stdlib/exit.c. It turns on thread safe
|
|
* behavior in libc if non-zero.
|
|
*/
|
|
extern int __isthreaded;
|
|
|
|
/* Optional. In case our code is dependant on the existence of
|
|
* the posix priority extentions kernel option.
|
|
*/
|
|
#if defined(LINUXTHREADS)
|
|
#include <sys/sysctl.h>
|
|
int _posix_priority_scheduling;
|
|
#endif
|
|
|
|
void *lock_create (void *context);
|
|
void rlock_acquire (void *lock);
|
|
void wlock_acquire (void *lock);
|
|
void lock_release (void *lock);
|
|
void lock_destroy (void *lock);
|
|
|
|
|
|
/* Use the constructor attribute so this gets run before main does */
|
|
static void _pthread_initialize(void) __attribute__((constructor));
|
|
|
|
static void _pthread_initialize(void)
|
|
{
|
|
|
|
#if defined(LINUXTHREADS)
|
|
int mib[2];
|
|
size_t len;
|
|
|
|
len = sizeof (_posix_priority_scheduling);
|
|
mib[0] = CTL_P1003_1B;
|
|
mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
|
|
if (-1 == sysctl (mib, 2, &_posix_priority_scheduling, &len, NULL, 0))
|
|
_posix_priority_scheduling = 0;
|
|
#endif
|
|
|
|
/* This turns on thread safe behaviour in libc when we link with it */
|
|
__isthreaded = 1;
|
|
|
|
}
|
|
|
|
void _spinlock (int * spinlock)
|
|
{
|
|
__pthread_acquire(spinlock);
|
|
}
|
|
|
|
void * lock_create (void *context)
|
|
{
|
|
pthread_rwlock_t *lock;
|
|
|
|
lock = malloc (sizeof (*lock));
|
|
if (lock == NULL)
|
|
return (NULL);
|
|
|
|
pthread_rwlock_init (lock, NULL);
|
|
return (lock);
|
|
}
|
|
|
|
void rlock_acquire (void *lock)
|
|
{
|
|
pthread_rwlock_rdlock ((pthread_rwlock_t *)lock);
|
|
|
|
}
|
|
|
|
void wlock_acquire (void *lock)
|
|
{
|
|
pthread_rwlock_wrlock ((pthread_rwlock_t *)lock);
|
|
|
|
}
|
|
|
|
void lock_release (void *lock)
|
|
{
|
|
pthread_rwlock_unlock ((pthread_rwlock_t *)lock);
|
|
}
|
|
|
|
void lock_destroy (void *lock)
|
|
{
|
|
if (pthread_rwlock_destroy ((pthread_rwlock_t *)lock) == 0)
|
|
free (lock);
|
|
}
|