Question

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <stdio.h>
#include <stdlib.h>
#include<signal.h>
#include<unistd.h>//getch();
#include <termios.h>//getch();
#include <pthread.h>
#include <unistd.h>
unsigned int sleep(unsigned int seconds);

volatile sig_atomic_t flag = 0;
int value = 0;
int count = 0;

char getch()
{
    int buf = 0;
    struct termios old = { 0 };
    fflush(stdout);
    if (tcgetattr(0, &old) < 0)
        perror("tcsetattr()");
    old.c_lflag &= ~ICANON;
    old.c_lflag &= ~ECHO;
    old.c_cc[VMIN] = 1;
    old.c_cc[VTIME] = 0;
    if (tcsetattr(0, TCSANOW, &old) < 0)
        perror("tcsetattr ICANON");
    if (read(0, &buf, 1) < 0)
        perror("read()");
    old.c_lflag |= ICANON;
    old.c_lflag |= ECHO;
    if (tcsetattr(0, TCSADRAIN, &old) < 0)
        perror("tcsetattr ~ICANON");

    return buf;
}
void *send_function(void *parg)
{
    printf("\n Send Thread ");
    count++;
    return parg;
}
void *receive_function(void *parg)
{
    printf("\n Receive Thread ");
    count++;
    return parg;
}
void my_function(int sig)
{
    flag = 1; // set flag
}

int main()
{
    char selection; //user input(s or r)
    pthread_t send;
    pthread_t receive;
    while (1)
    {
        signal(SIGINT, my_function);
        if (flag)
        {
            printf("\n Choose your terminal S or R \n");
            selection = getch();
            flag = 0;
        }
        if (selection == 's')
        {
            if (pthread_create(&send, NULL, send_function, NULL))
            {
                printf("Error creating thread=%d\n", count);
                return 1;
            }
        }
        else if (selection == 'r')
        {
            if (pthread_create(&receive, NULL, receive_function, NULL))
            {
                printf("Error creating thread=%d\n", count);
                return 1;
            }
        }

        printf("\n MAIN LOOP\n");
        //sleep(1);
    }
    return 0;
    //pthread_exit(NULL);
}

输出1：

MAIN LOOP

Receive Thread
MAIN LOOP

Receive Thread
MAIN LOOP

Receive Thread
MAIN LOOP

Receive Thread
Receive Thread
Receive Thread
Receive Thread Error creating thread=380
nivas@balakrishnan-HCL-Desktop:~/C_sample$

OUTPUT2：

MAIN LOOP

 MAIN LOOP

 MAIN LOOP

 Send Thread
 Send Thread
 Send Thread
 Send Thread
 Send Thread
 MAIN LOOP
 Error creating thread=379

在上面的代码中。当我按's'或'r'时，代码应该无限运行它应该相应地打印“发送线程”或“接收线程”无限次，而在此代码中大约380次只有while循环正在运行。我不会我知道它为什么会发生。我使用变量计数进行调试，有人可以帮忙吗？

Answer 1

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无限循环终止于pthread

1 个答案: