Exemplos de lockabyte em C++ (Cpp)

Exemplo n.º 1

Arquivo: 14-4.c Projeto: dolphinsboy/code_for_c

int main(void)
{
    int fd;
    pid_t pid;

    if ((fd = creat("templock", FILE_MODE)) < 0)
        err_sys("creat error");

    if (write(fd, "ab", 2) != 2)
        err_sys("write error");

    TELL_WAIT();

    if ((pid = fork()) < 0){
        err_sys("fork error");
    }else if(pid == 0){/*child*/
        lockabyte("child", fd, 0);

        TELL_PARENT(getppid());
        WAIT_PARENT();

        lockabyte("child", fd, 1);
    }else{
        lockabyte("parent", fd, 1);
        TELL_CHILD(pid);
        WAIT_CHILD();
        lockabyte("parent", fd, 0);
    }

    exit(0);
}

Exemplo n.º 2

Arquivo: lock.c Projeto: jack-lijing/unix

int main(int argc, char *argv[])
{
	int		fd;
	pid_t	pid;

	/*Create a file and write two bytes to it*/
	fd = Open("templock", O_RDWR | O_CREAT | O_TRUNC, FILE_MODE) ;

	if(write(fd, "ab", 2) != 2)
		err_sys("write error");

	TELL_WAIT();
	pid = Fork();

	if(pid == 0)
	{
		lockabyte("child", fd, 0);
		TELL_PARENT(getppid());
		WAIT_PARENT();
		lockabyte("child", fd, 1);
	}else 
	{
		lockabyte("parent", fd, 1);
		TELL_CHILD(pid);
		WAIT_CHILD();
		lockabyte("parent", fd, 0);
	}
	return 0;
}

Exemplo n.º 3

Arquivo: figure-14.7.c Projeto: YuanFanBin/learn

/* gcc apue.h apue_err.c figure-14.5.c figure-10.24.c figure-14.7.c */
int
main(void)
{
    int     fd;
    pid_t   pid;

    /*
     * Create a file and write two bytes to it.
     */
    if ((fd = creat("templock", FILE_MODE)) < 0)
        err_sys("creat error");
    if (write(fd, "ab", 2) != 2)
        err_sys("write error");

    TELL_WAIT();        /* figure-10.24.c */
    if ((pid = fork()) < 0) {
        err_sys("fork error");
    } else if (pid == 0) {  /* child */
        lockabyte("child", fd, 0);
        TELL_PARENT(getppid());
        WAIT_PARENT();
        lockabyte("child", fd, 1);
    } else {                /* parent */ 
        lockabyte("parent", fd, 1);
        TELL_CHILD(pid);
        WAIT_CHILD();
        lockabyte("parent", fd, 0);
    }
    exit(0);
}

Exemplo n.º 4

Arquivo: recordlock.c Projeto: gongweijun86/codes

int main(int argc, char* argv[])
{
	int fd;
	pid_t pid;

	if((fd = creat("templock", FILEMODE)) < 0)
		printf("creat error");
	if(write(fd, "ab", 2) != 2)
		printf("write error");

	TELL_WAIT();
	if((pid = fork()) < 0)
		printf("fork error");
	else if(pid == 0)
	{
		lockabyte("child:", fd, 0);
		TELL_PARENT(getpid());
		WAIT_PARENT();
		lockabyte("child:", fd, 1);
	}
	else
	{
		lockabyte("parent:", fd, 1);
		TELL_CHILD(pid);
		WAIT_CHILD();
		lockabyte("parent:", fd, 0);
	}
	exit(0);
}

Exemplo n.º 5

int main(void)
{
   int fd;
   pid_t pid;
   /* 建立檔案並寫兩個位元組*/
   if ((fd = creat("templock", 0666)) < 0)
       err_exit("creat error");
   write(fd, "ab", 2) ;
   if((pid = fork())==0) {              /* 子執行緒 */
       lockabyte("child", fd, 1);
       sleep(2);                /* 留出時間以便父執行緒鎖住位元組2 */
       lockabyte("child", fd, 2);
   } else {                      /* 父執行緒 */
       lockabyte("parent", fd, 2);
       sleep(2);                /* 留出時間以便子執行緒鎖住位元組1 */
       lockabyte("parent", fd, 1);
   }
   exit(EXIT_SUCCESS);
}