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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 USE_PTHREAD_API
#define ETHR_EVENT_OFF_WAITER__ -1L
#define ETHR_EVENT_OFF__ 1L
#define ETHR_EVENT_ON__ 0L
#ifdef USE_PTHREAD_API
typedef struct {
ethr_atomic32_t state;
pthread_mutex_t mtx;
pthread_cond_t cnd;
} ethr_event;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_EVENT_IMPL__)
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_set)(ethr_event *e)
{
ethr_sint32_t val;
val = ethr_atomic32_xchg_mb(&e->state, ETHR_EVENT_ON__);
if (val == ETHR_EVENT_OFF_WAITER__) {
int res = pthread_mutex_lock(&e->mtx);
if (res != 0)
ETHR_FATAL_ERROR__(res);
res = pthread_cond_signal(&e->cnd);
if (res != 0)
ETHR_FATAL_ERROR__(res);
res = pthread_mutex_unlock(&e->mtx);
if (res != 0)
ETHR_FATAL_ERROR__(res);
}
}
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_reset)(ethr_event *e)
{
ethr_atomic32_set(&e->state, ETHR_EVENT_OFF__);
ETHR_MEMORY_BARRIER;
}
#endif
#else
typedef struct {
ethr_atomic32_t state;
PROCESS proc;
} ethr_event;
#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_EVENT_IMPL__)
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_set)(ethr_event *e)
{
ethr_sint32_t val = ethr_atomic32_xchg_mb(&e->state, ETHR_EVENT_ON__);
if (val == ETHR_EVENT_OFF_WAITER__) {
#ifdef DEBUG
OSFSEMVAL fsem_val = get_fsem(e->proc);
/* There is a race in this assert.
This is because the state is set before the wait call in wait__.
We hope that a delay of 10 ms is enough */
if (fsem_val == 0)
delay(10);
ETHR_ASSERT(get_fsem(e->proc) == -1);
#endif
signal_fsem(e->proc);
}
}
static void ETHR_INLINE
ETHR_INLINE_FUNC_NAME_(ethr_event_reset)(ethr_event *e)
{
ethr_atomic32_set(&e->state, ETHR_EVENT_OFF__);
ETHR_MEMORY_BARRIER;
}
#endif
#endif
int ethr_event_init(ethr_event *e);
int ethr_event_destroy(ethr_event *e);
int ethr_event_wait(ethr_event *e);
int ethr_event_swait(ethr_event *e, int spincount);
#if !defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_EVENT_IMPL__)
void ethr_event_set(ethr_event *e);
void ethr_event_reset(ethr_event *e);
#endif
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