112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
/*
|
|
* eventflag.c - Eventflag
|
|
*
|
|
* Copyright (C) 2013, 2016 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>
|
|
|
|
|
|
void
|
|
eventflag_init (struct eventflag *ev)
|
|
{
|
|
ev->flags = 0;
|
|
chopstx_cond_init (&ev->cond);
|
|
chopstx_mutex_init (&ev->mutex);
|
|
}
|
|
|
|
|
|
eventmask_t
|
|
eventflag_wait (struct eventflag *ev)
|
|
{
|
|
int n;
|
|
|
|
chopstx_mutex_lock (&ev->mutex);
|
|
if (!ev->flags)
|
|
chopstx_cond_wait (&ev->cond, &ev->mutex);
|
|
|
|
n = __builtin_ffs (ev->flags);
|
|
ev->flags &= ~(1 << (n - 1));
|
|
chopstx_mutex_unlock (&ev->mutex);
|
|
|
|
return (1 << (n - 1));
|
|
}
|
|
|
|
|
|
static int
|
|
eventflag_check (void *arg)
|
|
{
|
|
struct eventflag *ev = arg;
|
|
|
|
return ev->flags != 0;
|
|
}
|
|
|
|
void
|
|
eventflag_set_poll_desc (struct eventflag *ev, chopstx_poll_cond_t *poll_desc)
|
|
{
|
|
poll_desc->type = CHOPSTX_POLL_COND;
|
|
poll_desc->ready = 0;
|
|
poll_desc->cond = &ev->cond;
|
|
poll_desc->mutex = &ev->mutex;
|
|
poll_desc->check = eventflag_check;
|
|
poll_desc->arg = ev;
|
|
}
|
|
|
|
eventmask_t
|
|
eventflag_wait_timeout (struct eventflag *ev, uint32_t usec)
|
|
{
|
|
chopstx_poll_cond_t poll_desc;
|
|
int n;
|
|
eventmask_t em = 0;
|
|
|
|
eventflag_set_poll_desc (ev, &poll_desc);
|
|
|
|
chopstx_poll (&usec, 1, &poll_desc);
|
|
|
|
chopstx_mutex_lock (&ev->mutex);
|
|
n = __builtin_ffs (ev->flags);
|
|
if (n)
|
|
{
|
|
em = (1 << (n - 1));
|
|
ev->flags &= ~em;
|
|
}
|
|
chopstx_mutex_unlock (&ev->mutex);
|
|
|
|
return em;
|
|
}
|
|
|
|
|
|
void
|
|
eventflag_signal (struct eventflag *ev, eventmask_t m)
|
|
{
|
|
chopstx_mutex_lock (&ev->mutex);
|
|
ev->flags |= m;
|
|
chopstx_cond_signal (&ev->cond);
|
|
chopstx_mutex_unlock (&ev->mutex);
|
|
}
|