예제 #1
0
void
sync_array_wait_event(
/*==================*/
	sync_array_t*	arr,	/* in: wait array */
	ulint		index)	/* in: index of the reserved cell */
{
	sync_cell_t*	cell;
	os_event_t	event;

	ut_a(arr);

	sync_array_enter(arr);

	cell = sync_array_get_nth_cell(arr, index);

	ut_a(cell->wait_object);
	ut_a(!cell->waiting);
	ut_ad(os_thread_get_curr_id() == cell->thread);

	if (cell->request_type == SYNC_MUTEX) {
		event = ((mutex_t*) cell->wait_object)->event;
#ifdef __WIN__
	/* On windows if the thread about to wait is the one which
	has set the state of the rw_lock to RW_LOCK_WAIT_EX, then
	it waits on a special event i.e.: wait_ex_event. */
	} else if (cell->request_type == RW_LOCK_WAIT_EX) {
		event = ((rw_lock_t*) cell->wait_object)->wait_ex_event;
#endif
	} else {
		event = ((rw_lock_t*) cell->wait_object)->event;
	}

		cell->waiting = TRUE;

#ifdef UNIV_SYNC_DEBUG

	/* We use simple enter to the mutex below, because if
	we cannot acquire it at once, mutex_enter would call
	recursively sync_array routines, leading to trouble.
	rw_lock_debug_mutex freezes the debug lists. */

	rw_lock_debug_mutex_enter();

	if (TRUE == sync_array_detect_deadlock(arr, cell, cell, 0)) {

		fputs("########################################\n", stderr);
		ut_error;
	}

	rw_lock_debug_mutex_exit();
#endif
	sync_array_exit(arr);

	os_event_wait_low(event, cell->signal_count);

	sync_array_free_cell(arr, index);
}
예제 #2
0
파일: sync0arr.c 프로젝트: 0x00xw/mysql-2
/******************************************************************//**
This function should be called when a thread starts to wait on
a wait array cell. In the debug version this function checks
if the wait for a semaphore will result in a deadlock, in which
case prints info and asserts. */
UNIV_INTERN
void
sync_array_wait_event(
/*==================*/
	sync_array_t*	arr,	/*!< in: wait array */
	ulint		index)	/*!< in: index of the reserved cell */
{
	sync_cell_t*	cell;
	os_event_t	event;

	ut_a(arr);

	sync_array_enter(arr);

	cell = sync_array_get_nth_cell(arr, index);

	ut_a(cell->wait_object);
	ut_a(!cell->waiting);
	ut_ad(os_thread_get_curr_id() == cell->thread);

	event = sync_cell_get_event(cell);
		cell->waiting = TRUE;

#ifdef UNIV_SYNC_DEBUG

	/* We use simple enter to the mutex below, because if
	we cannot acquire it at once, mutex_enter would call
	recursively sync_array routines, leading to trouble.
	rw_lock_debug_mutex freezes the debug lists. */

	rw_lock_debug_mutex_enter();

	if (TRUE == sync_array_detect_deadlock(arr, cell, cell, 0)) {

		fputs("########################################\n", stderr);
		ut_error;
	}

	rw_lock_debug_mutex_exit();
#endif
	sync_array_exit(arr);

	os_event_wait_low(event, cell->signal_count);

	sync_array_free_cell(arr, index);
}
예제 #3
0
void
sync_array_validate(
/*================*/
	sync_array_t*	arr)	/* in: sync wait array */
{
	ulint		i;
	sync_cell_t*	cell;
	ulint		count		= 0;

	sync_array_enter(arr);

	for (i = 0; i < arr->n_cells; i++) {
		cell = sync_array_get_nth_cell(arr, i);
		if (cell->wait_object != NULL) {
			count++;
		}
	}

	ut_a(count == arr->n_reserved);

	sync_array_exit(arr);
}
예제 #4
0
파일: sync0arr.c 프로젝트: 0x00xw/mysql-2
/******************************************************************//**
Reserves a wait array cell for waiting for an object.
The event of the cell is reset to nonsignalled state. */
UNIV_INTERN
void
sync_array_reserve_cell(
/*====================*/
	sync_array_t*	arr,	/*!< in: wait array */
	void*		object, /*!< in: pointer to the object to wait for */
	ulint		type,	/*!< in: lock request type */
	const char*	file,	/*!< in: file where requested */
	ulint		line,	/*!< in: line where requested */
	ulint*		index)	/*!< out: index of the reserved cell */
{
	sync_cell_t*	cell;
	os_event_t      event;
	ulint		i;

	ut_a(object);
	ut_a(index);

	sync_array_enter(arr);

	arr->res_count++;

	/* Reserve a new cell. */
	for (i = 0; i < arr->n_cells; i++) {
		cell = sync_array_get_nth_cell(arr, i);

		if (cell->wait_object == NULL) {

			cell->waiting = FALSE;
			cell->wait_object = object;

			if (type == SYNC_MUTEX) {
				cell->old_wait_mutex = object;
			} else {
				cell->old_wait_rw_lock = object;
			}

			cell->request_type = type;

			cell->file = file;
			cell->line = line;

			arr->n_reserved++;

			*index = i;

			sync_array_exit(arr);

			/* Make sure the event is reset and also store
			the value of signal_count at which the event
			was reset. */
                        event = sync_cell_get_event(cell);
			cell->signal_count = os_event_reset(event);

			cell->reservation_time = time(NULL);

			cell->thread = os_thread_get_curr_id();

			return;
		}
	}

	ut_error; /* No free cell found */

	return;
}