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
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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/waitq.h>
49#include <os/refcnt.h>
50
51typedef struct semaphore {
52 queue_chain_t task_link; /* chain of semaphores owned by a task */
53 struct waitq waitq; /* queue of blocked threads & lock */
54 task_t owner; /* task that owns semaphore */
55 ipc_port_t port; /* semaphore port */
56 os_refcnt_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) waitq_lock(&(semaphore)->waitq)
62#define semaphore_unlock(semaphore) waitq_unlock(&(semaphore)->waitq)
63
64extern void semaphore_init(void);
65
66extern void semaphore_reference(semaphore_t semaphore);
67extern void semaphore_dereference(semaphore_t semaphore);
68extern void semaphore_destroy_all(task_t task);
69
70#endif /* MACH_KERNEL_PRIVATE */
71
72#endif /* _KERN_SYNC_SEMA_H_ */
73