Date: Sat, 15 Jan 2000 22:45:58 -0500 From: "Mikhail Evstiounin" <evstiounin@adelphia.net> To: "Mikhail Evstiounin" <evstiounin@adelphia.net>, <freebsd-questions@FreeBSD.ORG> Subject: Re: Volatile variables Message-ID: <00cf01bf5fd4$34f2dc20$f8353018@evstiouninadelphia.net.pit.adelphia.net>
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>int allocated = 0;
>char *mem = NULL;
>
>
>void Sigusr1Handler( int siganl )
>{
> if ( allocateded )
> {
> sleep( 60 ); // just for fun
> mem[ 2 ] = 'F';
> ...
>
> }
>}
>
>void Sigusr2Handler( int siganl )
>{
> if ( allocated )
> {
> free( mem );
> mem = NULL;
> opened = 0;
> }
>}
>
>int main( int argc, char* argv[] )
>{
> mem = ( char* )malloc( 20 );
> opend = 1;
> ...
>
> return 0;
>}
Sorry, shoud be
int allocated = 0;
char *mem = NULL;
void Sigusr1Handler( int siganl )
{
if ( allocateded )
{
sleep( 60 ); // just for fun
mem[ 2 ] = 'F';
...
}
}
void Sigusr2Handler( int siganl )
{
if ( allocated )
{
free( mem );
mem = NULL;
allocated = 0;
}
}
int main( int argc, char* argv[] )
{
mem = ( char* )malloc( 20 );
opend = 1;
signal( SIGUSR1, Sigusr1Handler );
signal( SIGUSR2, Sigusr2Handler );
...
return 0;
}
compile, run and send 2 signals to a program -SIGUSR1 and SIGUSR2.
Actually, I am not sure if SIGUSR1 doesn't mask SIGUSR2, but you can
always choose two, when doesn't mask another. And see what is going
to happen if you use or do not use vilotile.
>
>
>
>
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