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/*
* eventflag.c - Eventflag with/without timeout
*
* Copyright (C) 2013 Flying Stone Technology
* Author: NIIBE Yutaka <gniibe@fsij.org>
*
* This file is a part of Chopstx, a thread library for embedded.
*
* Chopstx is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Chopstx is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As additional permission under GNU GPL version 3 section 7, you may
* distribute non-source form of the Program without the copy of the
* GNU GPL normally required by section 4, provided you inform the
* receipents of GNU GPL by a written offer.
*
*/
#include <stdint.h>
#include <stdlib.h>
#include <chopstx.h>
#include <eventflag.h>
enum {
EVENTFLAG_ERR_WAIT = CHOPSTX_ERR_JOIN + 1,
EVENTFLAG_ERR_TIMED_WAIT,
};
void
eventflag_init (struct eventflag *ev, chopstx_t sleeper)
{
ev->sleeper = sleeper;
if (sleeper)
ev->u.wait_usec = 0;
else
chopstx_cond_init (&ev->u.cond);
ev->flag = 0;
chopstx_mutex_init (&ev->mutex);
}
eventmask_t
eventflag_wait (struct eventflag *ev)
{
int n;
if (ev->sleeper)
chx_fatal (EVENTFLAG_ERR_WAIT);
chopstx_mutex_lock (&ev->mutex);
if (!ev->flag)
chopstx_cond_wait (&ev->u.cond, &ev->mutex);
n = __builtin_ffs (ev->flag);
ev->flag &= ~(1 << (n - 1));
chopstx_mutex_unlock (&ev->mutex);
return (1 << (n - 1));
}
eventmask_t
eventflag_wait_timeout (struct eventflag *ev, uint32_t usec)
{
eventmask_t em = 0;
int n;
if (ev->sleeper == 0)
chx_fatal (EVENTFLAG_ERR_TIMED_WAIT);
chopstx_mutex_lock (&ev->mutex);
if (!ev->flag)
{
ev->u.wait_usec = usec;
chopstx_mutex_unlock (&ev->mutex);
chopstx_usec_wait_var (&ev->u.wait_usec);
chopstx_mutex_lock (&ev->mutex);
ev->u.wait_usec = 0;
}
n = __builtin_ffs (ev->flag);
if (n)
{
em = (1 << (n - 1));
ev->flag &= ~em;
}
chopstx_mutex_unlock (&ev->mutex);
return em;
}
void
eventflag_signal (struct eventflag *ev, eventmask_t m)
{
chopstx_mutex_lock (&ev->mutex);
ev->flag |= m;
if (ev->sleeper)
{
if (ev->u.wait_usec)
{
ev->u.wait_usec = 0;
chopstx_wakeup_usec_wait (ev->sleeper);
}
}
else
chopstx_cond_signal (&ev->u.cond);
chopstx_mutex_unlock (&ev->mutex);
}
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