/* GNU Mailutils -- a suite of utilities for electronic mail Copyright (C) 1999, 2000, 2001, 2003, 2004, 2007 Free Software Foundation, Inc. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; 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 <stdlib.h> #include <errno.h> #include <mailutils/errno.h> #include <mailutils/monitor.h> #include <mailutils/refcount.h> struct _mu_refcount { unsigned int ref; mu_monitor_t lock; }; int mu_refcount_create (mu_refcount_t *prefcount) { int status = 0; mu_refcount_t refcount; if (prefcount == NULL) return MU_ERR_OUT_PTR_NULL; refcount = calloc (1, sizeof *refcount); if (refcount != NULL) { refcount->ref = 1; status = mu_monitor_create (&refcount->lock, 0, refcount); if (status == 0) { *prefcount = refcount; } else { free (refcount); } } else { status = ENOMEM; } return status; } unsigned mu_refcount_value (mu_refcount_t refcount) { return refcount ? refcount->ref : 0; } void mu_refcount_destroy (mu_refcount_t *prefcount) { if (prefcount && *prefcount) { mu_refcount_t refcount = *prefcount; mu_monitor_destroy (&refcount->lock, refcount); free (refcount); *prefcount = NULL; } } unsigned mu_refcount_inc (mu_refcount_t refcount) { int count = 0; if (refcount) { mu_monitor_wrlock (refcount->lock); count = ++refcount->ref; mu_monitor_unlock (refcount->lock); } return count; } unsigned mu_refcount_dec (mu_refcount_t refcount) { int count = 0; if (refcount) { mu_monitor_wrlock (refcount->lock); if (refcount->ref) count = --refcount->ref; mu_monitor_unlock (refcount->lock); } return count; }