我对pthread和xlib编程非常新颖。我试图绘制和移动两组相反方向的矩形,但是当我运行我的代码时,我的问题只有一个线程被执行,另一个被忽略。Pthread Xlib编程
我已经尝试了几个选项,但无济于事。任何建议将不胜感激。
我已经包含了我的源代码。
谢谢。
编译:gcc的-o Demofinal Demofinal.c -lpthread -lX11
运行:./Demofinal
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#include <pthread.h>
//Compile gcc -o Demofinal Demofinal.c -lpthread -lX11
//Run ./Demofinal
Display *dis;
Window win;
XEvent report;
GC green_gc;
XColor green_col;
Colormap colormap;
pthread_mutex_t mutexsum;
char green[] = "#00FF00";
void *createMoveLogs(void *ptr);
typedef struct str_thdata
{
int xval;
int yval;
int dir;
} thdata;
int main() {
pthread_t mvleft, mvright;
thdata data1, data2;
/* initialize data to pass to thread 1 and 2*/
data1.xval = 600;
data1.yval = 115;
data1.dir = 0;
data2.xval = 5;
data2.yval = 250;
data2.dir = 1;
dis = XOpenDisplay(NULL);
win = XCreateSimpleWindow(dis, RootWindow(dis, 0), 1, 1, 550, 550, 0, WhitePixel (dis, 0), WhitePixel(dis, 0));
XMapWindow(dis, win);
colormap = DefaultColormap(dis, 0);
green_gc = XCreateGC(dis, win, 0, 0);
XParseColor(dis, colormap, green, &green_col);
XAllocColor(dis, colormap, &green_col);
XSetForeground(dis, green_gc, green_col.pixel);
pthread_create(&mvleft, NULL, createMoveLogs, (void*) &data1);//thread 1 move right to left
pthread_create(&mvright, NULL, createMoveLogs, (void*) &data2);//thread 2 move left to right
pthread_join(mvleft, NULL);
pthread_join(mvright, NULL);
return 0;
}
void *createMoveLogs(void *ptr)
{
thdata *data;
data = (thdata *) ptr;
int x= data->xval; int y = data->yval; int i;
int direction = data->dir;
//check if the direction to move == left
if(direction == 0){
pthread_mutex_lock(&mutexsum);
for(i=0; i<=600; i++){
XDrawRectangle(dis, win, green_gc, x, y, 145, 50);
XDrawRectangle(dis, win, green_gc, x+200, y, 145, 50);
XDrawRectangle(dis, win, green_gc, x+400, y, 145, 50);
x-=10;
if (x==-500){x=data->xval; i=0;}
usleep(100000);
XFlush(dis);
XClearWindow(dis, win);
}
pthread_mutex_unlock(&mutexsum);
}else if(direction == 1){
pthread_mutex_lock(&mutexsum);
for(i=0; i<=600; i++){
XDrawRectangle(dis, win, green_gc, x, y, 145, 50);
XDrawRectangle(dis, win, green_gc, x-200, y, 145, 50);
XDrawRectangle(dis, win, green_gc, x-400, y, 145, 50);
x+=10;
if (x==855){x=5; i=0;}
usleep(100000);
XFlush(dis);
XClearWindow(dis, win);
}
pthread_mutex_lock(&mutexsum);
}
}
一次只有一个线程可以做X11调用 – 2012-04-15 07:21:19
@BasileStarynkevitch所以你的意思是我想要做什么将是不可能的?或者你有什么建议? – fanbondi 2012-04-15 07:30:19
的确,我建议只有一个线程在执行Xlib调用。使用像GTK或QT这样的工具包,只有主线程才能执行GUI调用。如果你绝对想要有多个线程在执行X11(这对我来说是错误的),请使用互斥量进行序列化,并且不要忘记经常调用Xsync。 – 2012-04-15 07:33:21