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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2009-2011. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Author: Rickard Green
*/
#define ETHR_INLINE_FUNC_NAME_(X) X ## __
#define ETHR_EVENT_IMPL__
#include "ethread.h"
#include "ethr_internal.h"
/* --- Windows implementation of thread events ------------------------------ */
void
ethr_init_event__(void)
{
}
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_prepare_timed(ethr_event *e)
{
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, ethr_sint64_t timeout)
{
DWORD code, tmo;
int sc, res, until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
if (timeout < 0)
tmo = INFINITE;
else if (timeout == 0) {
ethr_sint32_t state = ethr_atomic32_read(&e->state);
if (state == ETHR_EVENT_ON__) {
ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore);
return 0;
}
return ETIMEDOUT;
}
else {
/*
* Timeout in nano-seconds, but we can only
* wait for milli-seconds...
*/
tmo = (DWORD) (timeout - 1) / (1000*1000) + 1;
}
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__) {
ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore);
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, tmo);
if (code == WAIT_TIMEOUT)
return ETIMEDOUT;
if (code != WAIT_OBJECT_0)
ETHR_FATAL_ERROR__(ethr_win_get_errno__());
}
}
int
ethr_event_wait(ethr_event *e)
{
return wait(e, 0, -1);
}
int
ethr_event_swait(ethr_event *e, int spincount)
{
return wait(e, spincount, -1);
}
int
ethr_event_twait(ethr_event *e, ethr_sint64_t timeout)
{
return wait(e, 0, timeout);
}
int
ethr_event_stwait(ethr_event *e, int spincount, ethr_sint64_t timeout)
{
return wait(e, spincount, timeout);
}
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