e5106342c6
_foo - wrapped system call foo - weak definition to _foo and for cancellation points: _foo - wrapped system call __foo - enter cancellation point, call _foo(), leave cancellation point foo - weak definition to __foo Change use of global _thread_run to call a function to get the currently running thread. Make all pthread_foo functions weak definitions to _pthread_foo, where _pthread_foo is the implementation. This allows an application to provide its own pthread functions. Provide slightly different versions of pthread_mutex_lock and pthread_mutex_init so that we can tell the difference between a libc mutex and an application mutex. Threads holding mutexes internal to libc should never be allowed to exit, call signal handlers, or cancel. Approved by: -arch
99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
|
|
* 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 John Birrell.
|
|
* 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 JOHN BIRRELL 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
/* Find a thread in the linked list of active threads: */
|
|
int
|
|
_find_thread(pthread_t pthread)
|
|
{
|
|
pthread_t pthread1;
|
|
|
|
/* Check if the caller has specified an invalid thread: */
|
|
if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
|
|
/* Invalid thread: */
|
|
return(EINVAL);
|
|
|
|
/*
|
|
* Defer signals to protect the thread list from access
|
|
* by the signal handler:
|
|
*/
|
|
_thread_kern_sig_defer();
|
|
|
|
/* Search for the specified thread: */
|
|
TAILQ_FOREACH(pthread1, &_thread_list, tle) {
|
|
if (pthread == pthread1)
|
|
break;
|
|
}
|
|
|
|
/* Undefer and handle pending signals, yielding if necessary: */
|
|
_thread_kern_sig_undefer();
|
|
|
|
/* Return zero if the thread exists: */
|
|
return ((pthread1 != NULL) ? 0:ESRCH);
|
|
}
|
|
|
|
/* Find a thread in the linked list of dead threads: */
|
|
int
|
|
_find_dead_thread(pthread_t pthread)
|
|
{
|
|
pthread_t pthread1;
|
|
|
|
/* Check if the caller has specified an invalid thread: */
|
|
if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
|
|
/* Invalid thread: */
|
|
return(EINVAL);
|
|
|
|
/*
|
|
* Lock the garbage collector mutex to ensure that the garbage
|
|
* collector is not using the dead thread list.
|
|
*/
|
|
if (pthread_mutex_lock(&_gc_mutex) != 0)
|
|
PANIC("Cannot lock gc mutex");
|
|
|
|
/* Search for the specified thread: */
|
|
TAILQ_FOREACH(pthread1, &_dead_list, dle) {
|
|
if (pthread1 == pthread)
|
|
break;
|
|
}
|
|
|
|
/* Unlock the garbage collector mutex: */
|
|
if (pthread_mutex_unlock(&_gc_mutex) != 0)
|
|
PANIC("Cannot lock gc mutex");
|
|
|
|
/* Return zero if the thread exists: */
|
|
return ((pthread1 != NULL) ? 0:ESRCH);
|
|
}
|