1/*-------------------------------------------------------------------------
2 * drawElements Thread Library
3 * ---------------------------
4 *
5 * Copyright 2014 The Android Open Source Project
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 *      http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 *//*!
20 * \file
21 * \brief Unix implementation of semaphore.
22 *//*--------------------------------------------------------------------*/
23
24#include "deSemaphore.h"
25
26#if (DE_OS == DE_OS_UNIX || DE_OS == DE_OS_ANDROID || DE_OS == DE_OS_SYMBIAN)
27
28#include "deMemory.h"
29
30#include <semaphore.h>
31
32DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(sem_t*));
33
34deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes)
35{
36	sem_t*	sem	= (sem_t*)deMalloc(sizeof(sem_t));
37
38	DE_UNREF(attributes);
39	DE_ASSERT(initialValue >= 0);
40
41	if (!sem)
42		return 0;
43
44	if (sem_init(sem, 0, (unsigned int)initialValue) != 0)
45	{
46		deFree(sem);
47		return 0;
48	}
49
50	return (deSemaphore)sem;
51}
52
53void deSemaphore_destroy (deSemaphore semaphore)
54{
55	sem_t* sem = (sem_t*)semaphore;
56	DE_ASSERT(sem);
57	sem_destroy(sem);
58	deFree(sem);
59}
60
61void deSemaphore_increment (deSemaphore semaphore)
62{
63	sem_t*	sem	= (sem_t*)semaphore;
64	int		ret	= sem_post(sem);
65	DE_ASSERT(ret == 0);
66	DE_UNREF(ret);
67}
68
69void deSemaphore_decrement (deSemaphore semaphore)
70{
71	sem_t*	sem	= (sem_t*)semaphore;
72	int		ret	= sem_wait(sem);
73	DE_ASSERT(ret == 0);
74	DE_UNREF(ret);
75}
76
77deBool deSemaphore_tryDecrement (deSemaphore semaphore)
78{
79	sem_t* sem = (sem_t*)semaphore;
80	DE_ASSERT(sem);
81	return (sem_trywait(sem) == 0);
82}
83
84#endif /* DE_OS */
85