1/* 2 * Copyright (c) 2000-2007 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * @OSF_COPYRIGHT@ 30 * 31 */ 32/* 33 * File: kern/sync_sema.h 34 * Author: Joseph CaraDonna 35 * 36 * Contains RT distributed semaphore synchronization service definitions. 37 */ 38 39#ifndef _KERN_SYNC_SEMA_H_ 40#define _KERN_SYNC_SEMA_H_ 41 42#include <kern/kern_types.h> 43#include <mach/sync_policy.h> 44 45#ifdef MACH_KERNEL_PRIVATE 46 47#include <kern/queue.h> 48#include <kern/lock.h> 49#include <kern/wait_queue.h> 50 51typedef struct semaphore { 52 queue_chain_t task_link; /* chain of semaphores owned by a task */ 53 struct wait_queue wait_queue; /* queue of blocked threads & lock */ 54 task_t owner; /* task that owns semaphore */ 55 ipc_port_t port; /* semaphore port */ 56 uint32_t ref_count; /* reference count */ 57 int count; /* current count value */ 58 boolean_t active; /* active status */ 59} Semaphore; 60 61#define semaphore_lock(semaphore) wait_queue_lock(&(semaphore)->wait_queue) 62#define semaphore_unlock(semaphore) wait_queue_unlock(&(semaphore)->wait_queue) 63 64extern void semaphore_init(void) __attribute__((section("__TEXT, initcode"))); 65 66extern void semaphore_reference (semaphore_t semaphore); 67extern void semaphore_dereference (semaphore_t semaphore); 68 69#endif /* MACH_KERNEL_PRIVATE */ 70 71#endif /* _KERN_SYNC_SEMA_H_ */ 72