Posted on 2014-11-12 17:54
kongkongzi 阅读(274)
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c++ programming
Mutex and Condition variable in Linux:
1 int g_value = 0;
2 pthread_mutex_t g_pthread_mutex;
3 pthread_cond_t g_pthread_cond;
4
5
6 void* ThreadFunc1(void* args)
7 {
8 pthread_mutex_lock(&g_pthread_mutex);
9
10 printf("ThreadFunc1\n");
11
12 pthread_cond_wait(&g_pthread_cond, &g_pthread_mutex);
13
14 g_value = 1;
15 sleep(2);
16 printf("ThreadFunc1: g_value=%d.\n", g_value);
17
18 pthread_mutex_unlock(&g_pthread_mutex);
19 return NULL;
20 }
21
22
23 void* ThreadFunc2(void* args)
24 {
25 pthread_mutex_lock(&g_pthread_mutex);
26
27 printf("ThreadFunc2\n");
28
29 pthread_cond_signal(&g_pthread_cond);
30
31
32 g_value = 2;
33 sleep(2);
34 printf("ThreadFunc2: g_value=%d.\n", g_value);
35
36 pthread_mutex_unlock(&g_pthread_mutex);
37 return NULL;
38 }
1 int main(int argc, char **argv)
2 {
3 if (pthread_mutex_init(&g_pthread_mutex, NULL) != 0)
4 {
5 printf("fail to initial thread mutex.\n");
6 return -1;
7 }
8
9 if (pthread_cond_init(&g_pthread_cond, NULL) != 0)
10 {
11 printf("fail to initial thread condition.\n");
12 return -1;
13 }
14
15 pthread_t thread1;
16 int ret = pthread_create(&thread1, NULL, ThreadFunc1, NULL);
17 if (ret != 0)
18 {
19 printf("fail to create thread 1.\n");
20 return -1;
21 }
22
23 pthread_t thread2;
24 ret = pthread_create(&thread2, NULL, ThreadFunc2, NULL);
25 if (ret != 0)
26 {
27 printf("fail to create thread 2.\n");
28 return -1;
29 }
30
31 pthread_join(thread1, NULL);
32 pthread_join(thread2, NULL);
33
34 return 0;
35 }
输出：
ThreadFunc1
ThreadFunc2
ThreadFunc2: g_value=2.
ThreadFunc1: g_value=1.
Mutex and Condition variable in Windows:
HANDLE event
CreateEvent
SetEvent
ResetEvent
WaitForSingleObject
HANDLE mutex
CreateMutex
ReleaseMutex
WaitForSingleObject
注：Windows HANDLE类型可以为Event，Mutex，Process，Thread，Semaphore等。
说明：
1. C++在使用时，一般封装设计class Mutex，提供lock、unlock等函数，和设计class Monitor（boost::condition_variable_any），提供wait、notify等函数。