/*
* Copyright (c) 2008 Jiri Svoboda
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup debug
* @{
*/
/** @file
*/
#include <stdio.h>
#include <stdlib.h>
#include <fibril.h>
#include <async.h>
#include <futex.h>
#include "fib_synch.h"
void fcv_init(fcv_t *fcv)
{
int i;
for (i = 0; i < MAX_FIB; i++) {
fcv->waiting[i] = 0;
}
}
void fcv_wait(fcv_t *fcv)
{
fid_t fid;
int i;
futex_down(&async_futex);
fid = fibril_get_id();
for (i = 0; i < MAX_FIB; i++) {
if (fcv->waiting[i] == 0) {
fcv->waiting[i] = fid;
fibril_switch(FIBRIL_TO_MANAGER);
futex_up(&async_futex);
return;
}
}
futex_up(&async_futex);
printf("fcv_failed: too many waiting fibrils\n");
}
void fcv_broadcast(fcv_t *fcv)
{
int i;
futex_down(&async_futex);
for (i = 0; i < MAX_FIB; i++) {
if (fcv->waiting[i] != 0) {
fibril_add_ready(fcv->waiting[i]);
fcv->waiting[i] = 0;
}
}
futex_up(&async_futex);
}
/** @}
*/