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📄 Makefile.inc(976 B)
📄 thr_affinity.c(2.83 KB)
📄 thr_attr.c(18.69 KB)
📄 thr_autoinit.c(2.73 KB)
📄 thr_barrier.c(4.73 KB)
📄 thr_barrierattr.c(2.86 KB)
📄 thr_cancel.c(4.75 KB)
📄 thr_clean.c(3.45 KB)
📄 thr_concurrency.c(2.33 KB)
📄 thr_cond.c(14.19 KB)
📄 thr_condattr.c(3.75 KB)
📄 thr_create.c(8.23 KB)
📄 thr_ctrdtr.c(1.86 KB)
📄 thr_detach.c(2.3 KB)
📄 thr_equal.c(1.92 KB)
📄 thr_event.c(2.21 KB)
📄 thr_exit.c(8.52 KB)
📄 thr_fork.c(8.66 KB)
📄 thr_getcpuclockid.c(1.85 KB)
📄 thr_getprio.c(2.11 KB)
📄 thr_getschedparam.c(2.63 KB)
📄 thr_getthreadid_np.c(1.87 KB)
📄 thr_info.c(4.19 KB)
📄 thr_init.c(16.94 KB)
📄 thr_join.c(4.76 KB)
📄 thr_kern.c(5 KB)
📄 thr_kill.c(2.55 KB)
📄 thr_list.c(10 KB)
📄 thr_main_np.c(1.88 KB)
📄 thr_malloc.c(3.63 KB)
📄 thr_multi_np.c(1.96 KB)
📄 thr_mutex.c(30.24 KB)
📄 thr_mutexattr.c(8.28 KB)
📄 thr_once.c(3.32 KB)
📄 thr_printf.c(3.52 KB)
📄 thr_private.h(31.94 KB)
📄 thr_pshared.c(6.3 KB)
📄 thr_pspinlock.c(4.18 KB)
📄 thr_resume_np.c(3.14 KB)
📄 thr_rtld.c(6.07 KB)
📄 thr_rwlock.c(10.17 KB)
📄 thr_rwlockattr.c(2.84 KB)
📄 thr_self.c(1.93 KB)
📄 thr_sem.c(3.71 KB)
📄 thr_setprio.c(2.42 KB)
📄 thr_setschedparam.c(2.89 KB)
📄 thr_sig.c(19.89 KB)
📄 thr_single_np.c(1.97 KB)
📄 thr_sleepq.c(4.46 KB)
📄 thr_spec.c(7.03 KB)
📄 thr_spinlock.c(3.7 KB)
📄 thr_stack.c(10.63 KB)
📄 thr_suspend_np.c(5.4 KB)
📄 thr_switch_np.c(2.28 KB)
📄 thr_symbols.c(2.75 KB)
📄 thr_syscalls.c(16.69 KB)
📄 thr_umtx.c(8.8 KB)
📄 thr_umtx.h(8.02 KB)
📄 thr_yield.c(1.83 KB)

Editing: thr_once.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2005, David Xu <davidxu@freebsd.org>
 * 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 unmodified, 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "namespace.h"
#include <pthread.h>
#include "un-namespace.h"

#include "thr_private.h"

__weak_reference(_thr_once, pthread_once);
__weak_reference(_thr_once, _pthread_once);

#define ONCE_NEVER_DONE		PTHREAD_NEEDS_INIT
#define ONCE_DONE		PTHREAD_DONE_INIT
#define	ONCE_IN_PROGRESS	0x02
#define ONCE_WAIT		0x03

/*
 * POSIX:
 * The pthread_once() function is not a cancellation point. However,
 * if init_routine is a cancellation point and is canceled, the effect
 * on once_control shall be as if pthread_once() was never called.
 */
 
static void
once_cancel_handler(void *arg)
{
	pthread_once_t *once_control;

once_control = arg;
	if (atomic_cmpset_rel_int(&once_control->state, ONCE_IN_PROGRESS,
	    ONCE_NEVER_DONE))
		return;
	atomic_store_rel_int(&once_control->state, ONCE_NEVER_DONE);
	_thr_umtx_wake(&once_control->state, INT_MAX, 0);
}

int
_thr_once(pthread_once_t *once_control, void (*init_routine)(void))
{
	struct pthread *curthread;
	int state;

_thr_check_init();

for (;;) {
		state = once_control->state;
		if (state == ONCE_DONE) {
			atomic_thread_fence_acq();
			return (0);
		}
		if (state == ONCE_NEVER_DONE) {
			if (atomic_cmpset_int(&once_control->state, state,
			    ONCE_IN_PROGRESS))
				break;
		} else if (state == ONCE_IN_PROGRESS) {
			if (atomic_cmpset_int(&once_control->state, state,
			    ONCE_WAIT))
				_thr_umtx_wait_uint(&once_control->state,
				    ONCE_WAIT, NULL, 0);
		} else if (state == ONCE_WAIT) {
			_thr_umtx_wait_uint(&once_control->state, state,
			    NULL, 0);
		} else
			return (EINVAL);
        }

curthread = _get_curthread();
	THR_CLEANUP_PUSH(curthread, once_cancel_handler, once_control);
	init_routine();
	THR_CLEANUP_POP(curthread, 0);
	if (atomic_cmpset_rel_int(&once_control->state, ONCE_IN_PROGRESS,
	    ONCE_DONE))
		return (0);
	atomic_store_rel_int(&once_control->state, ONCE_DONE);
	_thr_umtx_wake(&once_control->state, INT_MAX, 0);
	return (0);
}

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Editing: thr_once.c

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