/* * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ * */ /* * File: kern/sync_sema.h * Author: Joseph CaraDonna * * Contains RT distributed semaphore synchronization service definitions. */ #ifndef _KERN_SYNC_SEMA_H_ #define _KERN_SYNC_SEMA_H_ #include <kern/kern_types.h> #include <mach/sync_policy.h> #ifdef MACH_KERNEL_PRIVATE #include <kern/queue.h> #include <kern/lock.h> #include <kern/wait_queue.h> typedef struct semaphore { queue_chain_t task_link; /* chain of semaphores owned by a task */ struct wait_queue wait_queue; /* queue of blocked threads & lock */ task_t owner; /* task that owns semaphore */ ipc_port_t port; /* semaphore port */ uint32_t ref_count; /* reference count */ int count; /* current count value */ boolean_t active; /* active status */ } Semaphore; #define semaphore_lock(semaphore) wait_queue_lock(&(semaphore)->wait_queue) #define semaphore_unlock(semaphore) wait_queue_unlock(&(semaphore)->wait_queue) extern void semaphore_init(void) __attribute__((section("__TEXT, initcode"))); extern void semaphore_reference (semaphore_t semaphore); extern void semaphore_dereference (semaphore_t semaphore); #endif /* MACH_KERNEL_PRIVATE */ #endif /* _KERN_SYNC_SEMA_H_ */