semaphore.h

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#pragma once
 
/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/** API for POSIX semaphores in mmapped memory.
 *
 * @file src/lib/util/semaphore.h
 *
 * @copyright 2025 Network RADIUS SAS (legal@networkradius.com)
 */
RCSIDH(semaphore_h, "$Id: 64ef3099e093d7e1589061a68b1e9bb3e27bb2f1 $")
 
#include <freeradius-devel/util/talloc.h>
 
/*
 *      Other OS's have sem_init, OS X doesn't.
 */
#ifdef HAVE_SEMAPHORE_H
#include <semaphore.h>
#endif
 
#define SEMAPHORE_LOCKED        (0)
 
#ifdef __APPLE__
#include <mach/task.h>
#include <mach/mach_init.h>
#include <mach/semaphore.h>
 
typedef semaphore_t fr_sem_t;
#undef sem_init
#define sem_init(s,p,c) semaphore_create(mach_task_self(),s,SYNC_POLICY_FIFO,c)
#undef sem_wait
#define sem_wait(s) semaphore_wait(*s)
#undef sem_post
#define sem_post(s) semaphore_signal(*s)
#undef sem_destroy
#define sem_destroy(s) semaphore_destroy(mach_task_self(),*s)
#else
typedef sem_t fr_sem_t;
#endif  /* __APPLE__ */
 
#define SEM_WAIT_INTR(_x) do {if (sem_wait(_x) == 0) break;} while (errno == EINTR)
 
fr_sem_t *fr_sem_alloc(void);
 
void fr_sem_free(fr_sem_t *sem);