src/semaphore_internal.h

   1 /*
   2  * Copyright (c) 2008-2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20
  21 /*
  22  * IMPORTANT: This header file describes INTERNAL interfaces to libdispatch
  23  * which are subject to change in future releases of Mac OS X. Any applications
  24  * relying on these interfaces WILL break.
  25  */
  26
  27 #ifndef __DISPATCH_SEMAPHORE_INTERNAL__
  28 #define __DISPATCH_SEMAPHORE_INTERNAL__
  29
  30 struct dispatch_queue_s;
  31
  32 struct dispatch_sema_notify_s {
  33         struct dispatch_sema_notify_s *volatile dsn_next;
  34         struct dispatch_queue_s *dsn_queue;
  35         void *dsn_ctxt;
  36         void (*dsn_func)(void *);
  37 };
  38
  39 DISPATCH_CLASS_DECL(semaphore);
  40 struct dispatch_semaphore_s {
  41         DISPATCH_STRUCT_HEADER(semaphore);
  42         long dsema_value;
  43         long dsema_orig;
  44         size_t dsema_sent_ksignals;
  45 #if USE_MACH_SEM && USE_POSIX_SEM
  46 #error "Too many supported semaphore types"
  47 #elif USE_MACH_SEM
  48         semaphore_t dsema_port;
  49         semaphore_t dsema_waiter_port;
  50 #elif USE_POSIX_SEM
  51         sem_t dsema_sem;
  52 #else
  53 #error "No supported semaphore type"
  54 #endif
  55         size_t dsema_group_waiters;
  56         struct dispatch_sema_notify_s *dsema_notify_head;
  57         struct dispatch_sema_notify_s *dsema_notify_tail;
  58 };
  59
  60 DISPATCH_CLASS_DECL(group);
  61
  62 void _dispatch_semaphore_dispose(dispatch_object_t dou);
  63 size_t _dispatch_semaphore_debug(dispatch_object_t dou, char *buf,
  64                 size_t bufsiz);
  65
  66 typedef uintptr_t _dispatch_thread_semaphore_t;
  67 _dispatch_thread_semaphore_t _dispatch_get_thread_semaphore(void);
  68 void _dispatch_put_thread_semaphore(_dispatch_thread_semaphore_t);
  69 void _dispatch_thread_semaphore_wait(_dispatch_thread_semaphore_t);
  70 void _dispatch_thread_semaphore_signal(_dispatch_thread_semaphore_t);
  71 void _dispatch_thread_semaphore_dispose(_dispatch_thread_semaphore_t);
  72
  73 #endif