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Annotation of XNU/osfmk/kern/sync_sema.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  * @OSF_COPYRIGHT@
                     24:  * 
                     25:  */
                     26: /*
                     27:  *     File:   kern/sync_sema.h
                     28:  *     Author: Joseph CaraDonna
                     29:  *
                     30:  *     Contains RT distributed semaphore synchronization service definitions.
                     31:  */
                     32: 
                     33: #ifndef _KERN_SYNC_SEMA_H_
                     34: #define _KERN_SYNC_SEMA_H_
                     35: 
                     36: #include <kern/kern_types.h>
                     37: 
                     38: #ifdef MACH_KERNEL_PRIVATE
                     39: 
                     40: #include <kern/queue.h>
                     41: #include <kern/lock.h>
                     42: #include <kern/wait_queue.h>
                     43: 
                     44: typedef struct semaphore {
                     45:        queue_chain_t     task_link;  /* chain of semaphores owned by a task */
                     46:        struct wait_queue wait_queue; /* queue of blocked threads & lock     */
                     47:        task_t            owner;      /* task that owns semaphore            */
                     48:        ipc_port_t        port;       /* semaphore port                      */
                     49:        int               ref_count;  /* reference count                     */
                     50:        int               count;      /* current count value                 */
                     51:        boolean_t         active;     /* active status                       */
                     52: } Semaphore;
                     53: 
                     54: 
                     55: #endif /* MACH_KERNEL_PRIVATE */
                     56: 
                     57: /*
                     58:  *     Forward Declarations
                     59:  */
                     60: extern kern_return_t   semaphore_create        (task_t task,
                     61:                                                 semaphore_t *new_semaphore,
                     62:                                                 int policy,
                     63:                                                 int value);
                     64: 
                     65: extern kern_return_t   semaphore_destroy       (task_t task,
                     66:                                                 semaphore_t semaphore);
                     67: 
                     68: extern void            semaphore_reference     (semaphore_t semaphore);
                     69: extern void            semaphore_dereference   (semaphore_t semaphore);
                     70: 
                     71: extern kern_return_t   semaphore_signal        (semaphore_t semaphore);
                     72: extern kern_return_t   semaphore_signal_all    (semaphore_t semaphore);
                     73: extern kern_return_t   semaphore_signal_thread (semaphore_t semaphore,
                     74:                                                 thread_act_t thread_act);
                     75: extern kern_return_t   semaphore_wait          (semaphore_t semaphore);
                     76: extern kern_return_t   semaphore_timedwait     (semaphore_t semaphore, 
                     77:                                                 mach_timespec_t wait_time);
                     78: 
                     79: #endif /* _KERN_SYNC_SEMA_H_ */

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