C- pthread

 #include "string.h"

#include "stdio.h"

#include "pthread.h"

#include "stdlib.h"

 

struct data{

 int num;

 char str[20];

 struct data *next;

};

struct data *all;

 

pthread_mutex_t lock=PTHREAD_MUTEX_INITIALIZER;

pthread_cond_t flag=PTHREAD_COND_INITIALIZER;

void do_work()

{

while(1)

{

 pthread_mutex_lock(&lock);

  if(all == NULL)

   {

   printf("thread is waiting...\n");

    pthread_cond_wait(&flag,&lock);

  printf("thread got data...\n");

   }

  struct data *tmp;

  tmp=all;

  all=all->next;

 pthread_mutex_unlock(&lock);

 printf("%d,%s\n",tmp->num,tmp->str);

 free(tmp);

}

}

 

void main(int argc,char *argv[])

{

    pthread_t go;

    pthread_create(&go,NULL,do_work,NULL);

    pthread_detach(go);

   while(1)

   {

    int num;

    char str[20];

    printf("plz input num and str\n");

    scanf("%d,%s",&num,str);

    pthread_mutex_lock(&lock);

    printf("main write data...\n");

    struct data *main1;

    main1=(struct data *)malloc(sizeof(struct data));

    main1->num=num;

    strcpy(main1->str,str);

    main1->next=NULL;

   if(all == NULL)

    all=main1;

   else{

        strcut data *tmp1;

        tmp1=all;

        while(tmp1->next !=NULL)

           tmp1=tmp1->next;

        tmp1->next=main1;

    }

    printf("main write over data...\n");

    pthread_cond_signal(&flag);

    pthread_mutex_unlock(&lock);

   }

}