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我使用pthread_cond_wait()和函數來創建一個多線程程序。它工作正常，如果條件正確，但條件不正確，它不工作，它不會忽略功能printinput()，它留在這裏，不運行繼續。你能幫我檢查這個錯誤嗎？pthread不工作使用pthread_cond_signal（）和pthread_cond_wait（）
我的代碼：
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
pthread_mutex_t mutex;
pthread_cond_t cond;
//Read input value
void* readinput(void *arg)
{
pthread_mutex_lock(&mutex);
int a;
printf("Input:");
scanf("%d",&a);
printf("Value: %d\n",a);
/*
if condition correct then "printinput" function
else ignore that function
*/
if (a>=2 && a<=8)
{
pthread_cond_signal(&cond);
}
pthread_mutex_unlock(&mutex);
pthread_exit((void *)a);
}
//print input value if condition correctly
void* printinput(void *arg)
{
pthread_mutex_lock(&mutex);
//Block and wait for cond Singal
pthread_cond_wait(&cond,&mutex);
printf("Your value between 2 and 8 \n\n");
pthread_mutex_unlock(&mutex);
pthread_exit(NULL);
}
int main()
{
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&cond, NULL);
pthread_t th1;
pthread_t th2;
while (1)
{
//Create pthread
pthread_create(&th1,NULL,&printinput,NULL);
pthread_create(&th2,NULL,&readinput,NULL);
//Wait pthread done
pthread_join(th1,NULL);
pthread_join(th2,NULL);
Sleep(1000);
}
}
結果：
Input:5
Value: 5
Your value between 2 and 8
Input:10 Value: 10