From owner-freebsd-questions  Sat Jan 15 19:43:22 2000
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From: "Mikhail Evstiounin" <evstiounin@adelphia.net>
To: "Mikhail Evstiounin" <evstiounin@adelphia.net>,
	<freebsd-questions@FreeBSD.ORG>
Subject: Re: Volatile variables
Date: Sat, 15 Jan 2000 22:45:58 -0500
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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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