/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018, 2019, 2020
* Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include <errno.h>
bool
of_condition_new(of_condition_t *condition)
{
condition->count = 0;
if ((condition->event = CreateEvent(NULL, FALSE, 0, NULL)) == NULL) {
errno = EAGAIN;
return false;
}
return true;
}
bool
of_condition_signal(of_condition_t *condition)
{
if (!SetEvent(condition->event)) {
switch (GetLastError()) {
case ERROR_INVALID_HANDLE:
errno = EINVAL;
return false;
default:
OF_ENSURE(0);
}
}
return true;
}
bool
of_condition_broadcast(of_condition_t *condition)
{
int count = condition->count;
for (int i = 0; i < count; i++) {
if (!SetEvent(condition->event)) {
switch (GetLastError()) {
case ERROR_INVALID_HANDLE:
errno = EINVAL;
return false;
default:
OF_ENSURE(0);
}
}
}
return true;
}
bool
of_condition_wait(of_condition_t *condition, of_mutex_t *mutex)
{
DWORD status;
if (!of_mutex_unlock(mutex))
return false;
of_atomic_int_inc(&condition->count);
status = WaitForSingleObject(condition->event, INFINITE);
of_atomic_int_dec(&condition->count);
switch (status) {
case WAIT_OBJECT_0:
return of_mutex_lock(mutex);
case WAIT_FAILED:
switch (GetLastError()) {
case ERROR_INVALID_HANDLE:
errno = EINVAL;
return false;
default:
OF_ENSURE(0);
}
default:
OF_ENSURE(0);
}
}
bool
of_condition_timed_wait(of_condition_t *condition, of_mutex_t *mutex,
of_time_interval_t timeout)
{
DWORD status;
if (!of_mutex_unlock(mutex))
return false;
of_atomic_int_inc(&condition->count);
status = WaitForSingleObject(condition->event, timeout * 1000);
of_atomic_int_dec(&condition->count);
switch (status) {
case WAIT_OBJECT_0:
return of_mutex_lock(mutex);
case WAIT_TIMEOUT:
errno = ETIMEDOUT;
return false;
case WAIT_FAILED:
switch (GetLastError()) {
case ERROR_INVALID_HANDLE:
errno = EINVAL;
return false;
default:
OF_ENSURE(0);
}
default:
OF_ENSURE(0);
}
}
bool
of_condition_free(of_condition_t *condition)
{
if (condition->count != 0) {
errno = EBUSY;
return false;
}
return CloseHandle(condition->event);
}