多线程累加程序

 

#include <stdio.h>
#include <pthread.h>
#include <sys/time.h>
#include <string.h>

#define MAX 30

pthread_t thrd1,thrd2,thrd3,thrd4,thrd5;
pthread_mutex_t mut;
int number =0,i;

void thread1(void)
...{
    printf("Thread1: this is thread1. ");
    for(i=0;i<MAX;i++)
    ...{
        printf("Thread1:number = %d ",number);
        pthread_mutex_lock(&mut);
        number++;
        pthread_mutex_unlock(&mut);
        sleep(2);
    }
    printf("Thread1:is main process waiting for me? ");
    pthread_exit(NULL);
}

void thread2(void)
...{
        printf("Thread2: this is thread2. ");
        for(i=0;i<MAX;i++)
        ...{
                printf("Thread2:number = %d ",number);
                pthread_mutex_lock(&mut);
                number++;
                pthread_mutex_unlock(&mut);
                sleep(3);
        }
        printf("Thread2:is main process waiting for me? ");
        pthread_exit(NULL);
}

void thread3(void)
...{
        printf("Thread3: this is thread3. ");
        for(i=0;i<MAX;i++)
        ...{
                printf("Thread3:number = %d ",number);
                pthread_mutex_lock(&mut);
                number++;
                pthread_mutex_unlock(&mut);
                sleep(2);
        }
        printf("Thread3:is main process waiting for me? ");
        pthread_exit(NULL);
}

void thread4(void)
...{
        printf("Thread4: this is thread4. ");
        for(i=0;i<MAX;i++)
        ...{
                printf("Thread4:number = %d ",number);
                pthread_mutex_lock(&mut);
                number++;
                pthread_mutex_unlock(&mut);
                sleep(3);
        }
        printf("Thread4:is main process waiting for me? ");
        pthread_exit(NULL);
}

void thread5(void)
...{
    printf("Thread5: I am the reporter~~~~ ");
     while(number<30)
    ...{
        printf("Reporter: The current number is %d ~~~~ ",number);
        sleep(4);
    }
}

void thread_create(void)
...{
    int temp;
    if((temp=pthread_create(&thrd1,NULL,(void *)thread1,NULL))!=0)
        printf("Fail to create thread1 ");
    else
        printf("Create thread1--- ");
    if((temp=pthread_create(&thrd2,NULL,(void *)thread2,NULL))!=0)
                printf("Fail to create thread2 ");
        else
                printf("Create thread2--- ");
    if((temp=pthread_create(&thrd3,NULL,(void *)thread3,NULL))!=0)
                printf("Fail to create thread3 ");
        else
                printf("Create thread3--- ");
  if((temp=pthread_create(&thrd4,NULL,(void *)thread4,NULL))!=0)
                printf("Fail to create thread4 ");
        else
                printf("Create thread4--- ");
  if((temp=pthread_create(&thrd5,NULL,(void *)thread5,NULL))!=0)
                printf("Fail to create thread5 ");
        else
                printf("Create thread5--- ");
    
}

void thread_wait(void)
...{
    if(thread1 !=0)
    ...{
        pthread_join(thrd1,NULL);
        printf("THread1 has terminated. ");
    }
    if(thread2 !=0)
    ...{
        pthread_join(thrd2,NULL);
        printf("Thread2 has terminated. ");
    }
    if(thread3 !=0)
        ...{
                pthread_join(thrd3,NULL);
                printf("Thread3 has terminated. ");
        }
  if(thread4 !=0)
        ...{
                pthread_join(thrd4,NULL);
                printf("Thread4 has terminated. ");
        }      
  if(thread5 !=0)
        ...{
                pthread_join(thrd5,NULL);
                printf("Thread5 has terminated. ");
        }   
}

int main(void)
...{
    struct timeval tpstart,tpend;
    float timeuse;
    gettimeofday(&tpstart,0);
    pthread_mutex_init(&mut,NULL);
    printf("Main process is creating thread...... ");
    thread_create();
    printf("Main process is waiting for thread's task...... ");
    thread_wait();
    gettimeofday(&tpend,0);
    timeuse = 1000000*(tpend.tv_sec-tpstart.tv_sec)+tpend.tv_usec-tpstart.tv_usec;
    timeuse/=1000000;
    printf("###############used time: %f  ",timeuse);
    return 0;
}