通過建立兩個線程來實現對一個數的遞加。
或許這個執行個體沒有實際運用的價值,但是稍微改動一下,我們就可以用到其他地方去拉。
- #include <pthread.h>
- #include <stdio.h>
- #include <sys/time.h>
- #include <string.h>
- #include <unistd.h>
- #define MAX 10
- pthread_t thread[2];
- pthread_mutex_t mut;
- int number=0, i;
- void *thread1(void *)
- {
- printf ("thread1 : I'm thread 1\n");
- for (i = 0; i < MAX; i++)
- {
- printf("thread1 : number = %d\n",number);
- pthread_mutex_lock(&mut);
- number++;
- pthread_mutex_unlock(&mut);
- sleep(2); // 可採用pthread_delay_np函數是線程睡眠2秒
- }
- printf("thread1 :the main function is waiting for me?\n");
- pthread_exit(NULL);
- }
- void *thread2(void *)
- {
- printf("thread2 : I'm thread 2\n");
- for (i = 0; i < MAX; i++)
- {
- printf("thread2 : number = %d\n",number);
- pthread_mutex_lock(&mut);
- number++;
- pthread_mutex_unlock(&mut);
- sleep(3);
- }
- printf("thread2 :the main function is waiting for me? \n");
- pthread_exit(NULL);
- }
- void thread_create(void)
- {
- int temp;
- memset(&thread, 0, sizeof(thread)); //comment1
- /*Create thread*/
- if((temp = pthread_create(&thread[0], NULL, thread1, NULL)) != 0) //comment2
- printf("Thread 1 fail to create!\n");
- else
- printf("Thread 1 created!\n");
- if((temp = pthread_create(&thread[1], NULL, thread2, NULL)) != 0) //comment3
- printf("Thread 2 fail to create!");
- else
- printf("Thread 2 created!\n");
- }
- void thread_wait(void)
- {
- /*Wait thread end*/
- if(thread[0] !=0) { //comment4
- pthread_join(thread[0],NULL);
- printf("Thread 1 completed\n");
- }
- if(thread[1] !=0) { //comment5
- pthread_join(thread[1],NULL);
- printf("Thread 2 completed.\n");
- }
- }
- int main()
- {
- /*init mutex*/
- pthread_mutex_init(&mut,NULL);
- printf("Main function,creating thread...\n");
- thread_create();
- printf("Main function,waiting for thread end....\n");
- thread_wait();
- return 0;
- }
我是主函數哦,我正在建立線程,呵呵
線程1被建立
線程2被建立
我是主函數哦,我正在等待線程完成任務阿,呵呵
thread1 : I'm thread 1
thread1 : number = 0
thread2 : I'm thread 2
thread2 : number = 1
thread1 : number = 2
thread2 : number = 3
thread1 : number = 4
thread2 : number = 5
thread1 : number = 6
thread1 : number = 7
thread2 : number = 8
thread1 : number = 9
thread2 : number = 10
thread1 :主函數在等我完成任務嗎?
線程1已經結束
thread2 :主函數在等我完成任務嗎?
線程2已經結束