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 |
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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 |
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20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
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23 | * Please see the License for the specific language governing rights and |
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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/waitq.h> |
49 | #include <os/refcnt.h> |
50 | |
51 | typedef 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 | |
64 | extern void semaphore_init(void); |
65 | |
66 | extern void semaphore_reference(semaphore_t semaphore); |
67 | extern void semaphore_dereference(semaphore_t semaphore); |
68 | extern void semaphore_destroy_all(task_t task); |
69 | |
70 | #endif /* MACH_KERNEL_PRIVATE */ |
71 | |
72 | #endif /* _KERN_SYNC_SEMA_H_ */ |
73 | |