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Ghost process
- From: Mikael Åsberg <mikas493 at student dot liu dot se>
- To: <cygwin at cygwin dot com>
- Date: Wed, 19 Feb 2003 07:47:53 +0100
- Subject: Ghost process
Hello. I am trying to teach myself basic Open GL programming (using the C
language) and I've run into an annoying problem. Consider the following
simple Open GL-program.
/* simple1_1.c */
#include <GL/glut.h>
void display()
{
glClear( GL_COLOR_BUFFER_BIT );
glBegin( GL_POLYGON );
glVertex2f( -0.5, -0.5 );
glVertex2f( -0.5, 0.5 );
glVertex2f( 0.5, 0.5 );
glVertex2f( 0.5, -0.5 );
glEnd();
glFlush();
}
int main( int argc, char** argv )
{
glutInit( &argc, argv );
glutCreateWindow( "simple 1-1" );
glutDisplayFunc( display );
glutMainLoop();
return 0;
}
I compile this program using gcc:
gcc -g -Wall -o simple1_1 simple1_1.c -lopengl32 -lglu32 -lglut32
It compiles and links without errors, and when I run it it works as
intended. However, there is one annoying problem. If I close the program by
pressing the little x-button in the upper right corner, it's not terminated
properly. I noticed this when I ran the program, closed it and made some
changes to the code. When I tried to compile&link an executable couldn't be
created because simple1_1.exe was already in use. I fired up the task
manager and found simple1_1.exe in the list of processes and had to
terminate there. So, by just pressing the close-button doesn't terminate the
program properly, but leaves a ghost process.
My question is: Why does it leave a "ghost process" and how do make it not
do that?
// Mikael
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