源程序如下:
#include 
#include 
#include 
#include 
#include 
 
int currDir=0;
int currNo=0;
pthread_mutex_t mutex=PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t v=PTHREAD_COND_INITIALIZER;
int i,j,k, jj,ii,kk,x;
  pthread_t upthread;
  pthread_t downthread;
  pthread_t upfirst;
 
  void process()
{
  int y=0;
for(y=0;y0)
        pthread_cond_wait(&v,&mutex);
       
        if(currDir!=0)
        currDir=0;
        
        currNo++;
        pthread_mutex_unlock(&mutex);
        process();
        currNo--;
        pthread_cond_signal(&v);
        pthread_mutex_unlock(&mutex);
if(pthread_kill(pthread_self(),SIGKILL))
fprintf(stderr,"sldkfjsldfk");
 
  }
  
  void* down(void* b){
  j=*((int*)b); printf("a customer arrives floor %d",&j);
        pthread_mutex_lock(&mutex);
        while(currDir!=1&&currNo>0)
        pthread_cond_wait(&v,&mutex);
        if(currDir!=1)
        currDir=1;
        currNo++;
        pthread_mutex_unlock(&mutex);
        process();
  
        pthread_mutex_lock(&mutex);
        currNo--;
        pthread_cond_signal(&v);
        pthread_mutex_unlock(&mutex);
if(pthread_kill(pthread_self(),SIGKILL))
fprintf(stderr,"sldkfjsldfk");
       
  }
  
        void main() {               
int i,j,k,iRandom;
 
int iSeed=time(NULL);
srand(iSeed); 
  i=rand(1,100);
printf("pre i is:%dn",i); 
 i=i%5+1;
 printf("i is: %dn",i); 
 ii=pthread_create(&upfirst,NULL,up,(void*)&i);
 if(ii!=0){
 perror("create thread error");
 exit(1);}
 
 
for(x=0;x

    

 

小弟的程序遇到麻烦了，想和哪位谈谈java的线程（57226475）

不太明白线程控制中的yield()，请高手给小弟见解一下，最好带例子？