projects / apple / xnu.git / blame
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|---|---|---|
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1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| ff6e181a A |
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. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 1c79356b | 12 | * |
| ff6e181a A |
13 | * The Original Code and all software distributed under the License are |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| ff6e181a A |
17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 1c79356b A |
20 | * |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | /* | |
| 24 | * @OSF_COPYRIGHT@ | |
| 25 | * | |
| 26 | */ | |
| 27 | /* | |
| 28 | * File: kern/sync_sema.h | |
| 29 | * Author: Joseph CaraDonna | |
| 30 | * | |
| 31 | * Contains RT distributed semaphore synchronization service definitions. | |
| 32 | */ | |
| 33 | ||
| 34 | #ifndef _KERN_SYNC_SEMA_H_ | |
| 35 | #define _KERN_SYNC_SEMA_H_ | |
| 36 | ||
| 37 | #include <kern/kern_types.h> | |
| 38 | #include <mach/sync_policy.h> | |
| 39 | ||
| 40 | #ifdef MACH_KERNEL_PRIVATE | |
| 41 | ||
| 42 | #include <kern/queue.h> | |
| 43 | #include <kern/lock.h> | |
| 44 | #include <kern/wait_queue.h> | |
| 45 | ||
| 46 | typedef struct semaphore { | |
| 47 | queue_chain_t task_link; /* chain of semaphores owned by a task */ | |
| 48 | struct wait_queue wait_queue; /* queue of blocked threads & lock */ | |
| 49 | task_t owner; /* task that owns semaphore */ | |
| 50 | ipc_port_t port; /* semaphore port */ | |
| 51 | int ref_count; /* reference count */ | |
| 52 | int count; /* current count value */ | |
| 53 | boolean_t active; /* active status */ | |
| 54 | } Semaphore; | |
| 55 | ||
| 56 | #define semaphore_lock(semaphore) wait_queue_lock(&(semaphore)->wait_queue) | |
| 57 | #define semaphore_unlock(semaphore) wait_queue_unlock(&(semaphore)->wait_queue) | |
| 58 | ||
| 59 | extern void semaphore_init(void); | |
| 60 | ||
| 61 | extern void semaphore_reference (semaphore_t semaphore); | |
| 62 | extern void semaphore_dereference (semaphore_t semaphore); | |
| 63 | ||
| 64 | #endif /* MACH_KERNEL_PRIVATE */ | |
| 65 | ||
| 66 | #endif /* _KERN_SYNC_SEMA_H_ */ |