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/* posix-sema.c
* Copyright (C) 2001 Werner Koch (dd9jn)
* Copyright (C) 2001, 2002 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include "util.h"
#include "sema.h"
#include "mutex.h"
static void
sema_fatal (const char *text)
{
fprintf (stderr, "sema.c: %s\n", text);
abort ();
}
static void
critsect_init (struct critsect_s *s)
{
static mutex_t init_lock;
static int initialized;
mutex_t *mp;
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. */
mutex_init (init_lock);
initialized = 1;
}
if (!s)
return; /* We just want to initialize ourself. */
/* First test whether it is really not initialized. */
mutex_lock (init_lock);
if (s->private)
{
mutex_unlock (init_lock);
return;
}
/* Now initialize it. */
mp = xtrymalloc (sizeof *mp);
if (!mp)
{
mutex_unlock (init_lock);
sema_fatal ("out of core while creating critical section lock");
}
mutex_init (*mp);
s->private = mp;
mutex_unlock (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);
mutex_lock (*((mutex_t *) s->private));
}
void
_gpgme_sema_cs_leave (struct critsect_s *s)
{
if (!s->private)
critsect_init (s);
mutex_unlock (*((mutex_t *) s->private));
}
void
_gpgme_sema_cs_destroy (struct critsect_s *s)
{
if (s && s->private)
{
mutex_destroy (*((mutex_t *) s->private));
xfree (s->private);
s->private = NULL;
}
}
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