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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2009-2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Author: Rickard Green
*/
#define ETHR_INLINE_FUNC_NAME_(X) X ## __
#define ETHR_EVENT_IMPL__
#include "ethread.h"
/* --- Windows implementation of thread events ------------------------------ */
int
ethr_event_init(ethr_event *e)
{
ethr_atomic32_init(&e->state, ETHR_EVENT_OFF__);
e->handle = CreateEvent(NULL, FALSE, FALSE, NULL);
if (e->handle == INVALID_HANDLE_VALUE)
return ethr_win_get_errno__();
return 0;
}
int
ethr_event_destroy(ethr_event *e)
{
BOOL res = CloseHandle(e->handle);
return res == 0 ? ethr_win_get_errno__() : 0;
}
void
ethr_event_set(ethr_event *e)
{
ethr_event_set__(e);
}
void
ethr_event_reset(ethr_event *e)
{
ethr_event_reset__(e);
}
static ETHR_INLINE int
wait(ethr_event *e, int spincount)
{
DWORD code;
int sc, res, until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
if (spincount < 0)
ETHR_FATAL_ERROR__(EINVAL);
sc = spincount;
while (1) {
ethr_sint32_t state;
while (1) {
state = ethr_atomic32_read(&e->state);
if (state == ETHR_EVENT_ON__)
return 0;
if (sc == 0)
break;
sc--;
ETHR_SPIN_BODY;
if (--until_yield == 0) {
until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
res = ETHR_YIELD();
if (res != 0)
ETHR_FATAL_ERROR__(res);
}
}
if (state != ETHR_EVENT_OFF_WAITER__) {
state = ethr_atomic32_cmpxchg(&e->state,
ETHR_EVENT_OFF_WAITER__,
ETHR_EVENT_OFF__);
if (state == ETHR_EVENT_ON__)
return 0;
ETHR_ASSERT(state == ETHR_EVENT_OFF__);
}
code = WaitForSingleObject(e->handle, INFINITE);
if (code != WAIT_OBJECT_0)
ETHR_FATAL_ERROR__(ethr_win_get_errno__());
}
}
int
ethr_event_wait(ethr_event *e)
{
return wait(e, 0);
}
int
ethr_event_swait(ethr_event *e, int spincount)
{
return wait(e, spincount);
}
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