| /* semaphore.h |
| * |
| * Copyright 2012 Christopher Anderson <chris@nullcode.org> |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef __KERNEL_SEMAPHORE_H |
| #define __KERNEL_SEMAPHORE_H |
| |
| #include <compiler.h> |
| #include <kernel/thread.h> |
| #include <kernel/mutex.h> |
| |
| __BEGIN_CDECLS; |
| |
| #define SEMAPHORE_MAGIC (0x73656D61) // 'sema' |
| |
| typedef struct semaphore { |
| int magic; |
| int count; |
| wait_queue_t wait; |
| } semaphore_t; |
| |
| #define SEMAPHORE_INITIAL_VALUE(s, _count) \ |
| { \ |
| .magic = SEMAPHORE_MAGIC, \ |
| .count = _count, \ |
| .wait = WAIT_QUEUE_INITIAL_VALUE((s).wait), \ |
| } |
| |
| void sem_init(semaphore_t *, unsigned int); |
| void sem_destroy(semaphore_t *); |
| int sem_post(semaphore_t *, bool resched); |
| status_t sem_wait(semaphore_t *); |
| status_t sem_trywait(semaphore_t *); |
| status_t sem_timedwait(semaphore_t *, lk_time_t); |
| |
| __END_CDECLS; |
| #endif |