d39d651258
joined and then the joiner thread. There isn't an easy (sane?) way to make it use the correct order without introducing races involving the target thread and finding which (active or dead) list it is on. So, after locking the canceled thread it will try to lock the joined thread and if it fails release the first lock and try again from the top. Introduce a new function, _spintrylock, which is simply a wrapper arround umtx_trylock(), to help accomplish this. Approved by: re/blanket libthr
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*
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* Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sched.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <libc_private.h>
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#include "thr_private.h"
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void
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_spinunlock(spinlock_t *lck)
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{
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_spinunlock_pthread(curthread, lck);
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}
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inline void
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_spinunlock_pthread(pthread_t pthread, spinlock_t *lck)
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{
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if (umtx_unlock((struct umtx *)lck, pthread->thr_id))
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abort();
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}
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/*
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* Lock a location for the running thread. Yield to allow other
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* threads to run if this thread is blocked because the lock is
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* not available. Note that this function does not sleep. It
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* assumes that the lock will be available very soon.
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*/
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void
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_spinlock(spinlock_t *lck)
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{
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_spinlock_pthread(curthread, lck);
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}
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int
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_spintrylock(spinlock_t *lck)
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{
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int error;
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error = umtx_trylock((struct umtx *)lck, curthread->thr_id);
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if (error != 0 && error != EBUSY)
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abort();
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return (error);
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}
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inline void
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_spinlock_pthread(pthread_t pthread, spinlock_t *lck)
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{
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if (umtx_lock((struct umtx *)lck, pthread->thr_id))
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abort();
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}
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/*
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* Lock a location for the running thread. Yield to allow other
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* threads to run if this thread is blocked because the lock is
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* not available. Note that this function does not sleep. It
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* assumes that the lock will be available very soon.
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*
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* This function checks if the running thread has already locked the
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* location, warns if this occurs and creates a thread dump before
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* returning.
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*/
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void
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_spinlock_debug(spinlock_t *lck, char *fname, int lineno)
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{
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if (umtx_lock((struct umtx *)lck, curthread->thr_id))
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abort();
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}
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