c7904405a8
In libthr we use PAGE_SIZE when allocating memory with mmap and to check various structs will fit into a single page so we can use this allocator for them. Ask the kernel for the page size on init for use by the page allcator and add a new machine dependent macro to hold the smallest page size the architecture supports to check the structure is small enough. This allows us to use the same libthr on arm64 with either 4k or 16k pages. Reviewed by: kib, markj, imp Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D34984
156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2003 David Xu <davidxu@freebsd.org>
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* Copyright (c) 2016 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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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 "un-namespace.h"
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#include "thr_private.h"
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_Static_assert(sizeof(struct pthread_spinlock) <= THR_PAGE_SIZE_MIN,
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"pthread_spinlock is too large for off-page");
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#define SPIN_COUNT 100000
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__weak_reference(_pthread_spin_init, pthread_spin_init);
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__weak_reference(_pthread_spin_destroy, pthread_spin_destroy);
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__weak_reference(_pthread_spin_trylock, pthread_spin_trylock);
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__weak_reference(_pthread_spin_lock, pthread_spin_lock);
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__weak_reference(_pthread_spin_unlock, pthread_spin_unlock);
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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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struct pthread_spinlock *lck;
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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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lck = malloc(sizeof(struct pthread_spinlock));
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if (lck == NULL)
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return (ENOMEM);
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*lock = lck;
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} else if (pshared == PTHREAD_PROCESS_SHARED) {
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lck = __thr_pshared_offpage(lock, 1);
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if (lck == NULL)
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return (EFAULT);
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*lock = THR_PSHARED_PTR;
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} else {
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return (EINVAL);
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}
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_thr_umutex_init(&lck->s_lock);
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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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void *l;
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int ret;
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if (lock == NULL || *lock == NULL) {
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ret = EINVAL;
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} else if (*lock == THR_PSHARED_PTR) {
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l = __thr_pshared_offpage(lock, 0);
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if (l != NULL)
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__thr_pshared_destroy(l);
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ret = 0;
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} else {
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free(*lock);
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*lock = NULL;
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ret = 0;
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}
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return (ret);
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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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struct pthread_spinlock *lck;
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if (lock == NULL || *lock == NULL)
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return (EINVAL);
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lck = *lock == THR_PSHARED_PTR ? __thr_pshared_offpage(lock, 0) : *lock;
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if (lck == NULL)
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return (EINVAL);
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return (THR_UMUTEX_TRYLOCK(_get_curthread(), &lck->s_lock));
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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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struct pthread *curthread;
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struct pthread_spinlock *lck;
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int count;
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if (lock == NULL)
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return (EINVAL);
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lck = *lock == THR_PSHARED_PTR ? __thr_pshared_offpage(lock, 0) : *lock;
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if (lck == NULL)
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return (EINVAL);
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curthread = _get_curthread();
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count = SPIN_COUNT;
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while (THR_UMUTEX_TRYLOCK(curthread, &lck->s_lock) != 0) {
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while (lck->s_lock.m_owner) {
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if (!_thr_is_smp) {
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_pthread_yield();
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} else {
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CPU_SPINWAIT;
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if (--count <= 0) {
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count = SPIN_COUNT;
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_pthread_yield();
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}
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}
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}
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}
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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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struct pthread_spinlock *lck;
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if (lock == NULL)
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return (EINVAL);
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lck = *lock == THR_PSHARED_PTR ? __thr_pshared_offpage(lock, 0) : *lock;
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if (lck == NULL)
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return (EINVAL);
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return (THR_UMUTEX_UNLOCK(_get_curthread(), &lck->s_lock));
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}
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