http://blog.csdn.net/yeyuangen/article/details/6732167
2011
1.互斥
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <pthread.h>
- #include <errno.h>
-
- pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
- int lock_var = 0;
- time_t end_time;
-
- void pthread1(void *arg);
- void pthread2(void *arg);
-
- int main(int argc, char *argv[])
- {
- pthread_t id1,id2;
- pthread_t mon_th_id;
- int ret;
-
- end_time = time(NULL)+10;
-
- pthread_mutex_init(&mutex,NULL);
-
- ret=pthread_create(&id1,NULL,(void *)pthread1, NULL);
- if(ret!=0)
- perror("pthread cread1");
-
- ret=pthread_create(&id2,NULL,(void *)pthread2, NULL);
- if(ret!=0)
- perror("pthread cread2");
-
- pthread_join(id1,NULL);
- pthread_join(id2,NULL);
-
- exit(0);
- }
-
- void pthread1(void *arg)
- {
- int i;
- while(time(NULL) < end_time)
- {
- if(pthread_mutex_lock(&mutex)!=0)
- {
- perror("pthread_mutex_lock");
- }
- else
- printf("pthread1:pthread1 lock the variable\n");
-
- for(i=0;i<2;i++)
- {
- sleep(1);
- lock_var++;
- }
-
- if(pthread_mutex_unlock(&mutex)!=0)
- {
- perror("pthread_mutex_unlock");
- }
- else
- printf("pthread1:pthread1 unlock the variable\n");
-
- sleep(1);
- }
- }
-
- void pthread2(void *arg)
- {
- int nolock=0;
- int ret;
-
- while(time(NULL) < end_time)
- {
- ret=pthread_mutex_trylock(&mutex);
- if(ret==EBUSY)
- printf("pthread2:the variable is locked by pthread1\n");
- else
- {
- if(ret!=0)
- {
- perror("pthread_mutex_trylock");
- exit(1);
- }
- else
- printf("pthread2:pthread2 got lock.The variable is %d\n",lock_var);
- if(pthread_mutex_unlock(&mutex)!=0)
- {
- perror("pthread_mutex_unlock");
- }
- else
- printf("pthread2:pthread2 unlock the variable\n");
- }
- sleep(3);
- }
- }
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