Linux--線程編程

1 #include 2 #include 3 #include 4 5 void *thrd_func(void *arg); 6 pthread_t tid; 7 8 int main(){ 9 // 創(chuàng)建線程tid，且線程函數(shù)由thrd_func指向，是thrd_func的入口點(diǎn)，即馬上執(zhí)行此線程函數(shù)10 if (pthread_create(&tid,NULL,thrd_func,NULL)!=0) {11 printf("Create thread error!\n");12 exit(1);13 }14 15 printf("TID in pthread_create function: %u.\n",tid);16 printf("Main process: PID: %d,TID: %u.\n",getpid(),pthread_self()); 17 18 sleep(1); //race19 20 return 0;21 }22 23 void *thrd_func(void *arg){24 // printf("I am new thread!\n");25 printf("New process: PID: %d,TID: %u.\n",getpid(),pthread_self()); //why pthread_self26 printf("New process: PID: %d,TID: %u.\n",getpid(),tid); //why pthread_self27 28 pthread_exit(NULL); //退出線程29 // return ((void *)0);30 }

1 #include 2 #include 3 #include 4 5 void *thrd_func1(void *arg); 6 void *thrd_func2(void *arg); 7 8 int main(){ 9 pthread_t tid1,tid2;10 void *tret;11 // 創(chuàng)建線程tid1，線程函數(shù)thrd_func112 if (pthread_create(&tid1,NULL,thrd_func1,NULL)!=0) {13 printf("Create thread 1 error!\n");14 exit(1);15 }16 // 創(chuàng)建線程tid2,線程函數(shù)thrd_func217 if (pthread_create(&tid2,NULL,thrd_func2,NULL)!=0) {18 printf("Create thread 2 error!\n");19 exit(1);20 }21 // 等待線程tid1結(jié)束，線程函數(shù)返回值放在tret中22 if (pthread_join(tid1,&tret)!=0){23 printf("Join thread 1 error!\n");24 exit(1);25 }26 27 printf("Thread 1 exit code: %d.\n",(int *)tret);28 // 等待tid2結(jié)束，線程函數(shù)返回值放在tret中29 if (pthread_join(tid2,&tret)!=0){30 printf("Join thread 2 error!\n");31 exit(1);32 }33 34 printf("Thread 2 exit code: %d.\n",(int *)tret);35 36 return 0;37 }38 39 void *thrd_func1(void *arg){40 printf("Thread 1 returning!\n");41 // sleep(3);42 return ((void *)1); // 自動(dòng)退出線程43 }44 45 void *thrd_func2(void *arg){46 printf("Thread 2 exiting!\n");47 pthread_exit((void *)2); // 線程主動(dòng)退出，返回(void *)248 }

1 #include 2 #include 3 #include 4 5 void *thrd_func1(void *arg); 6 void *thrd_func2(void *arg); 7 8 pthread_t tid1,tid2; 9 10 int main(){11 // 創(chuàng)建線程tid1，線程函數(shù)thrd_func112 if (pthread_create(&tid1,NULL,thrd_func1,NULL)!=0) {13 printf("Create thread 1 error!\n");14 exit(1);15 }16 // 創(chuàng)建線程tid2，線程函數(shù)thrd_func217 if (pthread_create(&tid2,NULL,thrd_func2,NULL)!=0) {18 printf("Create thread 2 error!\n");19 exit(1);20 }21 // 等待線程tid1退出22 if (pthread_join(tid1,NULL)!=0){23 printf("Join thread 1 error!\n");24 exit(1);25 }else26 printf("Thread 1 Joined!\n");27 // 等待線程tid2退出28 if (pthread_join(tid2,NULL)!=0){29 printf("Join thread 2 error!\n");30 exit(1);31 }else32 printf("Thread 2 Joined!\n");33 34 return 0;35 }36 37 void *thrd_func1(void *arg){38 // pthread_setcancelstate(PTHREAD_CANCEL_DISABLE,NULL);39 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,NULL); // 設(shè)置其他線程可以cancel掉此線程40 41 while(1) {42 printf("Thread 1 is running!\n");43 sleep(1);44 }45 pthread_exit((void *)0);46 }47 48 void *thrd_func2(void *arg){49 printf("Thread 2 is running!\n");50 sleep(5);51 if (pthread_cancel(tid1)==0) // 線程tid2向線程tid1發(fā)送cancel52 printf("Send Cancel cmd to Thread 1.\n");53 54 pthread_exit((void *)0);55 }

1 #include 2 #include 3 #include 4 5 #define THREAD_NUM 3 6 #define REPEAT_TIMES 5 7 #define DELAY 4 8 9 void *thrd_func(void *arg);10 11 int main(){12 pthread_t thread[THREAD_NUM];13 int no;14 void *tret;15 16 srand((int)time(0)); // 初始化隨機(jī)函數(shù)發(fā)生器 17 18 for(no=0;no19 if (pthread_create(&thread[no],NULL,thrd_func,(void*)no)!=0) { // 創(chuàng)建THREAD_NUM個(gè)線程，傳入(void*)no作為thrd_func的參數(shù)20 printf("Create thread %d error!\n",no);21 exit(1);22 } else23 printf("Create thread %d success!\n",no);24 }25 26 for(no=0;no27 if (pthread_join(thread[no],&tret)!=0){ // 等待thread[no]線程結(jié)束，線程函數(shù)返回值放在tret中28 printf("Join thread %d error!\n",no);29 exit(1);30 }else31 printf("Join thread %d success!\n",no);32 }33 34 return 0;35 }36 37 void *thrd_func(void *arg){38 int thrd_num=(void*)arg;39 int delay_time=0;40 int count=0;41 42 printf("Thread %d is starting.\n",thrd_num);43 for(count=0;count44 delay_time=(int)(DELAY*(rand()/(double)RAND_MAX))+1;45 sleep(delay_time);46 printf("\tThread %d:job %d delay =%d.\n",thrd_num,count,delay_time);47 }48 49 printf("Thread %d is exiting.\n",thrd_num);50 pthread_exit(NULL);51 }

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和上一版本的程序差異在于有沒有鎖，有鎖的情況下，必須等"thread x is exiting."之后其他線程才能繼續(xù)。

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