Mutex and Condition variable

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。