116 lines
2.3 KiB
C
116 lines
2.3 KiB
C
/* $OpenBSD: rthread_spin_lock.c,v 1.5 2020/04/06 00:01:08 pirofti Exp $ */
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/*
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* Copyright (c) 2012 Paul Irofti <paul@irofti.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "rthread.h"
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int
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pthread_spin_init(pthread_spinlock_t *lock, int pshared)
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{
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pthread_spinlock_t l = NULL;
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if (lock == NULL)
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return (EINVAL);
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if (pshared != PTHREAD_PROCESS_PRIVATE)
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return (ENOTSUP);
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l = calloc(1, sizeof *l);
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if (l == NULL)
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return (ENOMEM);
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l->lock = _SPINLOCK_UNLOCKED;
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*lock = l;
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return (0);
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}
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int
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pthread_spin_destroy(pthread_spinlock_t *lock)
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{
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if (lock == NULL || *lock == NULL)
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return (EINVAL);
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if ((*lock)->owner != NULL)
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return (EBUSY);
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free(*lock);
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*lock = NULL;
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return (0);
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}
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int
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pthread_spin_trylock(pthread_spinlock_t *lock)
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{
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pthread_t self = pthread_self();
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pthread_spinlock_t l;
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if (lock == NULL || *lock == NULL)
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return (EINVAL);
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l = *lock;
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if (l->owner == self)
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return (EDEADLK);
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if (!_spinlocktry(&l->lock))
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return (EBUSY);
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l->owner = self;
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return (0);
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}
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int
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pthread_spin_lock(pthread_spinlock_t *lock)
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{
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pthread_t self = pthread_self();
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pthread_spinlock_t l;
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if (lock == NULL || *lock == NULL)
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return (EINVAL);
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l = *lock;
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if (l->owner == self)
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return (EDEADLK);
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_spinlock(&l->lock);
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l->owner = self;
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return (0);
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}
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int
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pthread_spin_unlock(pthread_spinlock_t *lock)
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{
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pthread_t self = pthread_self();
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pthread_spinlock_t l;
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if (lock == NULL || *lock == NULL)
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return (EINVAL);
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l = *lock;
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if (l->owner != self)
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return (EPERM);
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l->owner = NULL;
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_spinunlock(&l->lock);
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return (0);
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}
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