/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_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 */ int 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); extern void semaphore_reference (semaphore_t semaphore); extern void semaphore_dereference (semaphore_t semaphore); #endif /* MACH_KERNEL_PRIVATE */ #endif /* _KERN_SYNC_SEMA_H_ */