forked from Qortal/Brooklyn
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
/*
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* eventflag.c - Eventflag
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*
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* Copyright (C) 2013, 2016, 2018 Flying Stone Technology
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* Author: NIIBE Yutaka <gniibe@fsij.org>
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*
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* This file is a part of Chopstx, a thread library for embedded.
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*
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* Chopstx is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Chopstx is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* As additional permission under GNU GPL version 3 section 7, you may
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* distribute non-source form of the Program without the copy of the
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* GNU GPL normally required by section 4, provided you inform the
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* receipents of GNU GPL by a written offer.
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <chopstx.h>
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#include <eventflag.h>
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void
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eventflag_init (struct eventflag *ev)
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{
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ev->flags = 0;
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ev->mask = ~0;
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chopstx_cond_init (&ev->cond);
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chopstx_mutex_init (&ev->mutex);
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}
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void
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eventflag_set_mask (struct eventflag *ev, eventmask_t m)
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{
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chopstx_mutex_lock (&ev->mutex);
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ev->mask = m;
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if ((ev->flags & ev->mask))
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chopstx_cond_signal (&ev->cond);
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chopstx_mutex_unlock (&ev->mutex);
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}
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static int
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eventflag_check (void *arg)
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{
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struct eventflag *ev = arg;
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return (ev->flags & ev->mask) != 0;
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}
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void
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eventflag_prepare_poll (struct eventflag *ev, chopstx_poll_cond_t *poll_desc)
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{
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poll_desc->type = CHOPSTX_POLL_COND;
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poll_desc->ready = 0;
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poll_desc->cond = &ev->cond;
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poll_desc->mutex = &ev->mutex;
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poll_desc->check = eventflag_check;
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poll_desc->arg = ev;
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}
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/* When multiple events are marked, event with lower bit has precedence.
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Because __builtin_ffs returns the least significant 1-bit. */
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eventmask_t
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eventflag_get (struct eventflag *ev)
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{
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int n;
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eventmask_t m;
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chopstx_mutex_lock (&ev->mutex);
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n = __builtin_ffs ((ev->flags & ev->mask));
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if (n)
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{
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m = (1 << (n - 1));
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ev->flags &= ~m;
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}
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else
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m = 0;
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chopstx_mutex_unlock (&ev->mutex);
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return m;
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}
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eventmask_t
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eventflag_wait (struct eventflag *ev)
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{
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int n;
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eventmask_t m;
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chopstx_mutex_lock (&ev->mutex);
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while (!(ev->flags & ev->mask))
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chopstx_cond_wait (&ev->cond, &ev->mutex);
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n = __builtin_ffs ((ev->flags & ev->mask));
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if (n) /* Always n > 0 when waked up, but make sure no bad things. */
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{
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m = (1 << (n - 1));
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ev->flags &= ~m;
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}
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else
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m = 0;
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chopstx_mutex_unlock (&ev->mutex);
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return m;
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}
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eventmask_t
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eventflag_wait_timeout (struct eventflag *ev, uint32_t usec)
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{
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chopstx_poll_cond_t poll_desc;
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struct chx_poll_head *pd_array[1] = { (struct chx_poll_head *)&poll_desc };
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eventflag_prepare_poll (ev, &poll_desc);
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chopstx_poll (&usec, 1, pd_array);
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return eventflag_get (ev);
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}
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void
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eventflag_signal (struct eventflag *ev, eventmask_t m)
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{
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chopstx_mutex_lock (&ev->mutex);
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ev->flags |= m;
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if ((ev->flags & ev->mask))
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chopstx_cond_signal (&ev->cond);
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chopstx_mutex_unlock (&ev->mutex);
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}
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