c - 多线程使用ncurses时，终端乱码

Question

这个问题已经有答案了:

Why has no one written a threadsafe branch of the ncurses library? (1 个回答)

已关闭 5 年前。

我用ncurses写图书馆管理系统时，多线程时终端乱码，我的布局是三个窗口。

1.我的代号为ncurses.c

#include <stdio.h>
#include <ncurses.h>
#include <pthread.h>
#include <time.h>
#include <unistd.h>


typedef struct _WIN_struct {
    int startx, starty;
    int height, width;
} WIN;

WIN winTitle;      /* title win */
WIN winMenu;   /* Main menu win */
WIN winNews;       /* win news */

WINDOW *create_newwin(int height, int width, int starty, int startx) {
    WINDOW *local_win;
    local_win = newwin(height, width, starty, startx);
    box(local_win, 0, 0);
    wrefresh(local_win);
    return local_win;
}

char *getTimeNow() {
    time_t rawtime;
    struct tm *timeinfo;
    time(&rawtime);
    timeinfo = localtime(&rawtime);
    return asctime(timeinfo);
}

void *threadfunc_title(void *p) {
    WINDOW *windowTitle;
    windowTitle = create_newwin(winTitle.height, winTitle.width, winTitle.starty, winTitle.startx);

    /* show title and time */
    for (;;) {
        mvwprintw(windowTitle, winTitle.height/2, winTitle.width/2 - 10, "%s", "Library Management System");
        mvwprintw(windowTitle, winTitle.height-2, winTitle.width-30, "%s", getTimeNow());
        wrefresh(windowTitle);
        sleep(1);
    }

}

void *threadfunc_menu(void *p) {
    WINDOW *windowMenu;
    windowMenu = create_newwin(winMenu.height, winMenu.width, winMenu.starty, winMenu.startx);

    for (;;) {
        /* now do nothing */
        sleep(1);
    }

}

void *threadfunc_news(void *p) {
    WINDOW *windowNews;
    windowNews = create_newwin(winNews.height, winNews.width, winNews.starty, winNews.startx);

    for (;;) {
        wprintw(windowNews, "%d. %s,%s", getTimeNow(), 1, "a borrow a book from c");
        wrefresh(windowNews);
        wclear(windowNews);
        sleep(5);
    }
}

void initWin(WIN *p_win, int height, int width, int starty, int startx) {
    p_win->height = height;
    p_win->width = width;
    p_win->starty = starty;
    p_win->startx = startx;
}


int main(int argc, char *argv[])
{
    pthread_t pidTitle;
    pthread_t pidMenu;
    pthread_t pidNews;

    initscr();
    start_color();
    cbreak();
    keypad(stdscr, TRUE);
    noecho();

    /* init location */
    initWin(&winTitle, LINES*0.2, COLS, 0 , 0);
    initWin(&winMenu, LINES*0.7, COLS*0.7, LINES*0.25, 0);
    initWin(&winNews, LINES*0.7, COLS*0.2, LINES*0.25, COLS*0.7);

    pthread_create(&pidTitle, NULL, threadfunc_title, NULL);
    pthread_create(&pidMenu, NULL, threadfunc_menu, NULL);
    pthread_create(&pidNews, NULL, threadfunc_news, NULL);

    pthread_join(pidTitle, NULL);
    pthread_join(pidMenu, NULL);
    pthread_join(pidNews, NULL);

    endwin();
    return 0;
}

2.三个窗口三个线程，thread_func_xxx()是pthread_create()的第三个参数。

3.编译运行

$ gcc ncurses.c -lncurses -lpthread -o ncurses
$ ./ncurses

然后，我得到终端乱码。

ps:
1.我变了-lncurses至-lncursesw ，但没有效果。
2.如果你没有安装ncurses，可以按照 this .

Answer 1

简短:该示例将不起作用，因为用于更新屏幕的较低级别函数共享未互斥的数据。如果使用 pthread 编译 ncurses选项，改进了 re-entrancy高级函数并添加一些互斥体，可以使用多个线程。