| | 1 | /* |
| | 2 | * Copyright (c) 2000-2020 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 |
| | 24 | * limitations under the License. |
| | 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_reference(semaphore_t semaphore); |
| | 65 | extern void semaphore_dereference(semaphore_t semaphore); |
| | 66 | extern void semaphore_destroy_all(task_t task); |
| | 67 | |
| | 68 | #endif /* MACH_KERNEL_PRIVATE */ |
| | 69 | |
| | 70 | #endif /* _KERN_SYNC_SEMA_H_ */ |
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