1 mike  1.1 /*
 2           **==============================================================================
 3           **
 4           ** Open Management Infrastructure (OMI)
 5           **
 6           ** Copyright (c) Microsoft Corporation
 7           ** 
 8           ** Licensed under the Apache License, Version 2.0 (the "License"); you may not 
 9           ** use this file except in compliance with the License. You may obtain a copy 
10           ** of the License at 
11           **
12           **     http://www.apache.org/licenses/LICENSE-2.0 
13           **
14           ** THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15           ** KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED 
16           ** WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, 
17           ** MERCHANTABLITY OR NON-INFRINGEMENT. 
18           **
19           ** See the Apache 2 License for the specific language governing permissions 
20           ** and limitations under the License.
21           **
22 mike  1.1 **==============================================================================
23           */
24           
25           #include <common.h>
26           #include "atomic.h"
27           
28           #if defined(MI_DEFAULT_ATOMIC_REQUIRED)
29           #include <pthread.h>
30           
31           static pthread_mutex_t s_mutex = PTHREAD_MUTEX_INITIALIZER;
32           
33           // Atomically increment x.
34           EXTERNC void AtomicInc(AtomicInt* x)
35           {
36               pthread_mutex_lock(&s_mutex);
37               (*x) ++;
38               pthread_mutex_unlock(&s_mutex);
39           }
40           
41           // AtomicType decrement x and return true if it becomes zero.
42           EXTERNC unsigned char AtomicDec(AtomicInt* x)
43 mike  1.1 {
44               MI_Boolean res;
45           
46               pthread_mutex_lock(&s_mutex);
47               (*x) --;
48               res = (*x) == 0;
49               pthread_mutex_unlock(&s_mutex);
50           
51               return res;
52           }
53           
54           #endif
55