monitor.c
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/* GNU mailutils - a suite of utilities for electronic mail
Copyright (C) 1999, 2000 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. */
#include <errno.h>
#include <stdlib.h>
#include <monitor0.h>
int
monitor_create (monitor_t *pmonitor, void *owner)
{
monitor_t monitor;
int status = 0;
if (pmonitor == NULL)
return EINVAL;
monitor = calloc (1, sizeof (*monitor));
if (monitor == NULL)
return ENOMEM;
monitor->owner = owner;
status = RWLOCK_INIT (&(monitor->lock), NULL);
if (status == 0)
{
free (monitor);
return status;
}
*pmonitor = monitor;
return status;
}
void *
monitor_get_owner (monitor_t monitor)
{
return (monitor == NULL) ? NULL : monitor->owner;
}
void
monitor_destroy (monitor_t *pmonitor, void *owner)
{
if (pmonitor && *pmonitor)
{
monitor_t monitor = *pmonitor;
if (monitor->owner == owner)
{
RWLOCK_DESTROY (&(monitor->lock));
}
free (monitor);
*pmonitor = NULL;
}
}
int
monitor_rdlock (monitor_t monitor)
{
if (monitor)
{
return RWLOCK_RDLOCK (&(monitor->lock));
}
return 0;
}
int
monitor_wrlock (monitor_t monitor)
{
if (monitor)
{
return RWLOCK_WRLOCK (&(monitor->lock));
}
return 0;
}
int
monitor_unlock (monitor_t monitor)
{
if (monitor)
{
return RWLOCK_UNLOCK (&(monitor->lock));
}
return 0;
}
int
monitor_wait (monitor_t monitor)
{
(void)monitor;
return ENOSYS;
}
int
monitor_notify (monitor_t monitor)
{
(void)monitor;
return ENOSYS;
}