gpgme/gpgme/w32-sema.c

/* w32-sema.c 
 *	Copyright (C) 2001 Werner Koch (dd9jn)
 *      Copyright (C) 2001 g10 Code GmbH
 *
 * This file is part of GPGME.
 *
 * GPGME is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GPGME is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */


#include <config.h>
#ifdef HAVE_DOSISH_SYSTEM

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <windows.h>
#include "syshdr.h"

#include "util.h"
#include "sema.h"

static void
sema_fatal (const char *text)
{
    fprintf (stderr, "sema.c: %s\n", text);
    abort ();
}


static void
critsect_init (struct critsect_s *s)
{
    CRITICAL_SECTION *mp;
    static CRITICAL_SECTION init_lock;
    static int initialized;
    
    if (!initialized) {
        /* the very first time we call this function, we assume that only
         * one thread is running, so that we can bootstrap the semaphore code 
         */
        InitializeCriticalSection (&init_lock);
        initialized = 1;
    }
    if (!s)
        return; /* we just want to initialize ourself */

    /* first test whether it is really not initialized */
    EnterCriticalSection (&init_lock);
    if ( s->private ) {
        LeaveCriticalSection (&init_lock);
        return;
    }
    /* now init it */
    mp = xtrymalloc ( sizeof *mp );
    if (!mp) {
        LeaveCriticalSection (&init_lock);
        sema_fatal ("out of core while creating critical section lock");
    }
    InitializeCriticalSection (mp);
    s->private = mp;
    LeaveCriticalSection (&init_lock);
}

void
_gpgme_sema_subsystem_init ()
{
    /* fixme: we should check that there is only one thread running */
    critsect_init (NULL);
}


void
_gpgme_sema_cs_enter ( struct critsect_s *s )
{
    if (!s->private)
        critsect_init (s);
    EnterCriticalSection ( (CRITICAL_SECTION*)s->private );
}

void
_gpgme_sema_cs_leave (struct critsect_s *s)
{
    if (!s->private)
        critsect_init (s);
    LeaveCriticalSection ( (CRITICAL_SECTION*)s->private );
}

void
_gpgme_sema_cs_destroy ( struct critsect_s *s )
{
    if (s && s->private) {
        DeleteCriticalSection ((CRITICAL_SECTION*)s->private);
        xfree (s->private);
        s->private = NULL;
    }
}



#endif /*HAVE_DOSISH_SYSTEM*/