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_sema_notify_s {
  31         struct dispatch_sema_notify_s *volatile dsn_next;
  32         dispatch_queue_t dsn_queue;
  33         void *dsn_ctxt;
  34         void (*dsn_func)(void *);
  35 };
  36
  37 struct dispatch_semaphore_s {
  38         DISPATCH_STRUCT_HEADER(dispatch_semaphore_s, dispatch_semaphore_vtable_s);
  39         long dsema_value;
  40         long dsema_orig;
  41         size_t dsema_sent_ksignals;
  42 #if USE_MACH_SEM && USE_POSIX_SEM
  43 #error "Too many supported semaphore types"
  44 #elif USE_MACH_SEM
  45         semaphore_t dsema_port;
  46         semaphore_t dsema_waiter_port;
  47 #elif USE_POSIX_SEM
  48         sem_t dsema_sem;
  49 #else
  50 #error "No supported semaphore type"
  51 #endif
  52         size_t dsema_group_waiters;
  53         struct dispatch_sema_notify_s *dsema_notify_head;
  54         struct dispatch_sema_notify_s *dsema_notify_tail;
  55 };
  56
  57 extern const struct dispatch_semaphore_vtable_s _dispatch_semaphore_vtable;
  58
  59 typedef uintptr_t _dispatch_thread_semaphore_t;
  60 _dispatch_thread_semaphore_t _dispatch_get_thread_semaphore(void);
  61 void _dispatch_put_thread_semaphore(_dispatch_thread_semaphore_t);
  62 void _dispatch_thread_semaphore_wait(_dispatch_thread_semaphore_t);
  63 void _dispatch_thread_semaphore_signal(_dispatch_thread_semaphore_t);
  64 void _dispatch_thread_semaphore_dispose(_dispatch_thread_semaphore_t);
  65
  66 #endif