I've a problem in the use of threads, they don't work as i want them
to.
Here's the code, the problem is that if i uncomment the
//pthread_join(th read_ID, NULL);, the main program stops until the
spawned thread is finished, but that's not the intended way, because i
need that the opc variable change only when the user pushes a key, i
think it has something to do with the pthread_attr_se t(atribute)
options, but i didn't get with the answer in the man(3).
The way i need it works is that main continues looping inside the while
even if the thread hasn't finished.
By the way i did't do the mygetch function, but it's not the problem
with the thread.
//------------------------------------------------------------
// This example tries to show the use of pthreadss,
// it only runs on Linux, because of the pthread.h
// header file.
//
// It has many bugs, you can only run it in a terminal
// started in a X-session, otherwise it will crash, the main
// problem is that i commented out the pthread_join line, and
// i made that because that line waits for the thread to
// end, and in this example it wouldn't work, i'm almost
// sure that changing the attr attributes can make this
// run better, any way, i didn't find the solution, another
// problem is that the thread runs too fast, so it's
// difficult to apreciate well the moves of the character.
// So, if you think you can resolve those problems, please
// send me a mail, or just modify the code, but please, let
// know, 'cause i really want to learn the solution.
//
// Author: Juan Francisco Benavides Nanni.
// mail: el*****@gmail.c om
// URL: http://mmabj.tk
// date: 29/12/2005
//------------------------------------------------------------
#include <stdio.h>
#include <pthread.h>
#include <termios.h>
#include <unistd.h>
#define MAXWIDX 78
#define MAXWIDY 19
#define MIN 0
#define CENTER 10
#define gotoxy(x,y) printf("\x1B[%i;%iH",(y),(x) )
#define clrscr() printf("\x1B[2J")
#define UP 115
#define DOWN 120
#define LEFT 122
#define RIG 99
#define SALE 27
void mover(int *opc);
int mygetch();
int main(){
pthread_t thread_ID;
pthread_attr_t attr;
int opc, last, x, y;
pthread_attr_in it(&attr);
pthread_attr_se tscope(&attr, PTHREAD_SCOPE_P ROCESS);
pthread_setconc urrency(2);
char car = '^';
opc = UP;
y = CENTER;
x = y * 4;
while(1){
if(opc == SALE) break;
clrscr();
switch(opc){
case UP:
if(y > MIN) y -= 1;
else y = MAXWIDY;
car = '^';
break;
case DOWN:
if(y < MAXWIDY) y += 1;
else y = MIN;
car = 'v';
break;
case LEFT:
if(x > MIN) x -= 1;
else x = MAXWIDX;
car = '<';
break;
case RIG:
if(x < MAXWIDX) x += 1;
else x = MIN;
car = '>';
break;
case SALE:
break;
default:
opc = last;
}
gotoxy(x, y);
printf("%c", car);
last = opc;
pthread_create( &thread_ID, &attr, (void *) mover, &opc);
//pthread_join(th read_ID, NULL);
}
}
void mover(int *opc){
*opc = mygetch();
}
int mygetch(){
struct termios oldt, newt;
int ch;
tcgetattr( STDIN_FILENO, &oldt );
newt = oldt;
newt.c_lflag &= ~( ICANON | ECHO );
tcsetattr( STDIN_FILENO, TCSANOW, &newt );
ch = getchar();
tcsetattr( STDIN_FILENO, TCSANOW, &oldt );
return ch;
}
