semaphore.h revision 270710
1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5270710Shselasky * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6219820Sjeff * All rights reserved. 7219820Sjeff * 8219820Sjeff * Redistribution and use in source and binary forms, with or without 9219820Sjeff * modification, are permitted provided that the following conditions 10219820Sjeff * are met: 11219820Sjeff * 1. Redistributions of source code must retain the above copyright 12219820Sjeff * notice unmodified, this list of conditions, and the following 13219820Sjeff * disclaimer. 14219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 15219820Sjeff * notice, this list of conditions and the following disclaimer in the 16219820Sjeff * documentation and/or other materials provided with the distribution. 17219820Sjeff * 18219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28219820Sjeff */ 29219820Sjeff#ifndef _LINUX_SEMAPHORE_H_ 30219820Sjeff#define _LINUX_SEMAPHORE_H_ 31219820Sjeff 32219820Sjeff#include <sys/param.h> 33219820Sjeff#include <sys/lock.h> 34219820Sjeff#include <sys/sema.h> 35219820Sjeff 36219820Sjeff/* 37219820Sjeff * XXX BSD semaphores are disused and slow. They also do not provide a 38219820Sjeff * sema_wait_sig method. This must be resolved eventually. 39219820Sjeff */ 40219820Sjeffstruct semaphore { 41219820Sjeff struct sema sema; 42219820Sjeff}; 43219820Sjeff 44219820Sjeff#define down(_sem) sema_wait(&(_sem)->sema) 45219820Sjeff#define down_interruptible(_sem) sema_wait(&(_sem)->sema), 0 46219820Sjeff#define down_trylock(_sem) !sema_trywait(&(_sem)->sema) 47219820Sjeff#define up(_sem) sema_post(&(_sem)->sema) 48219820Sjeff 49219820Sjeffstatic inline void 50219820Sjefflinux_sema_init(struct semaphore *sem, int val) 51219820Sjeff{ 52219820Sjeff 53219820Sjeff memset(&sem->sema, 0, sizeof(sem->sema)); 54219820Sjeff sema_init(&sem->sema, val, "lnxsema"); 55219820Sjeff} 56219820Sjeff 57219820Sjeffstatic inline void 58219820Sjeffinit_MUTEX(struct semaphore *sem) 59219820Sjeff{ 60219820Sjeff 61219820Sjeff memset(&sem->sema, 0, sizeof(sem->sema)); 62219820Sjeff sema_init(&sem->sema, 1, "lnxsema"); 63219820Sjeff} 64219820Sjeff 65219820Sjeff#define sema_init linux_sema_init 66219820Sjeff 67219820Sjeff#endif /* _LINUX_SEMAPHORE_H_ */ 68