refcount.c
2.22 KB
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/* GNU mailutils - a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Library Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <mailutils/monitor.h>
#include <mailutils/error.h>
#include <mailutils/sys/refcount.h>
int
mu_refcount_create (mu_refcount_t *prefcount)
{
mu_refcount_t refcount;
if (prefcount == NULL)
return MU_ERROR_INVALID_PARAMETER;
refcount = calloc (1, sizeof *refcount);
if (refcount == NULL)
return MU_ERROR_NO_MEMORY;
refcount->ref = 1;
monitor_create (&(refcount->lock));
*prefcount = refcount;
return 0;
}
void
mu_refcount_destroy (mu_refcount_t *prefcount)
{
if (prefcount && *prefcount)
{
mu_refcount_t refcount = *prefcount;
monitor_destroy (&refcount->lock);
free (refcount);
*prefcount = NULL;
}
}
int
mu_refcount_lock (mu_refcount_t refcount)
{
if (refcount)
return monitor_lock (refcount->lock);
return 0;
}
int
mu_refcount_unlock (mu_refcount_t refcount)
{
if (refcount)
return monitor_unlock (refcount->lock);
return 0;
}
int
mu_refcount_inc (mu_refcount_t refcount)
{
int count = 0;
if (refcount)
{
monitor_lock (refcount->lock);
count = ++refcount->ref;
monitor_unlock (refcount->lock);
}
return count;
}
int
mu_refcount_dec (mu_refcount_t refcount)
{
int count = 0;
if (refcount)
{
monitor_lock (refcount->lock);
if (refcount->ref)
count = --refcount->ref;
monitor_unlock (refcount->lock);
}
return count;
}