情景1：

Jack开着一辆出租车来到一个网站停车。看见没人就走了。过段时间。Susan来到网站准备乘车。可是没有来，于是就等着。过了一会Mike开着车来到了这个网站，Sunsan就上了Mike的车走了。如图所看到的：

程序实现该情景：

#include 
     
      #include 
      
       #include 
       
        #include 
        
         pthread_cond_t taxicond = PTHREAD_COND_INITIALIZER;pthread_mutex_t taximutex = PTHREAD_MUTEX_INITIALIZER;void *traveler_arrive(void *name){    char *p = (char *)name;    printf ("Travelr: %s need a taxi now!\n", p);    pthread_mutex_lock(&taximutex);    pthread_cond_wait(&taxicond, &taximutex);    pthread_mutex_unlock(&taximutex);    printf ("traveler: %s now got a taxi!\n", p);    pthread_exit(NULL);}void *taxi_arrive(void *name){    char *p = (char *)name;    printf ("Taxi: %s arrives.\n", p);    pthread_cond_signal(&taxicond);    pthread_exit(NULL);}int main (int argc, char **argv){    char *name;    pthread_t thread;    pthread_attr_t threadattr;    pthread_attr_init(&threadattr);    name = "Jack";    pthread_create(&thread, &threadattr, taxi_arrive, name);    sleep(1);    name = "Susan";    pthread_create(&thread, &threadattr, traveler_arrive, name);    sleep(1);    name = "Mike";    pthread_create(&thread, &threadattr, taxi_arrive, name);    sleep(1);    return 0;} /* ----- End of main() ----- */
        
       
      
     

情景2：

Jack开着一辆出租车来到一个网站停车，看见没人就等着。过段时间，Susan来到网站准备乘车看见了Jack的出租车，于是就上去了。过了一会Mike开着车来到了这个网站，看见没人救等着。

如图所看到的：

程序实现该情景：

#include 
     
      #include 
      
       #include 
       
        #include 
        
         int travelercount = 0;pthread_cond_t taxicond = PTHREAD_COND_INITIALIZER;pthread_mutex_t taximutex = PTHREAD_MUTEX_INITIALIZER;void *traveler_arrive(void *name){    char *p = (char *)name;    pthread_mutex_lock(&taximutex);    printf ("traveler: %s need a taxi now!\n", p);    travelercount++;    pthread_cond_wait(&taxicond, &taximutex);                pthread_mutex_unlock(&taximutex);    printf ("traveler: %s now got a taxi!\n", p);    pthread_exit(NULL);}void *taxi_arrive(void *name){    char *p = (char *)name;    printf ("Taxi: %s arrives.\n", p);    for(;;){        if(travelercount){            pthread_cond_signal(&taxicond);            travelercount--;            break;        }    }    pthread_exit(NULL);}int main (int argc, char **argv){    char *name;    pthread_t thread;    pthread_attr_t threadattr;    pthread_attr_init(&threadattr);    name = "Jack";    pthread_create(&thread, &threadattr, taxi_arrive, name);    sleep(1);    name = "Susan";    pthread_create(&thread, &threadattr, traveler_arrive, name);    sleep(3);    name = "Mike";    pthread_create(&thread, &threadattr, taxi_arrive, name);    sleep(4);    return 0;} /* ----- End of main() ----- */
        
       
      
     

author: fulinux

E-mail: fulinux@sina.com

blog: blog.csdn.net/fulinus