123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/*
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* eventflag.c - Eventflag with/without timeout
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*
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* Copyright (C) 2013 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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enum {
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EVENTFLAG_ERR_WAIT = CHOPSTX_ERR_JOIN + 1,
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EVENTFLAG_ERR_TIMED_WAIT,
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};
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void
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eventflag_init (struct eventflag *ev, chopstx_t sleeper)
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{
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ev->sleeper = sleeper;
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if (sleeper)
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ev->u.wait_usec = 0;
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else
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chopstx_cond_init (&ev->u.cond);
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ev->flag = 0;
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chopstx_mutex_init (&ev->mutex);
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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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if (ev->sleeper)
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chx_fatal (EVENTFLAG_ERR_WAIT);
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chopstx_mutex_lock (&ev->mutex);
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if (!ev->flag)
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chopstx_cond_wait (&ev->u.cond, &ev->mutex);
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n = __builtin_ffs (ev->flag);
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ev->flag &= ~(1 << (n - 1));
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chopstx_mutex_unlock (&ev->mutex);
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return (1 << (n - 1));
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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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eventmask_t em = 0;
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int n;
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if (ev->sleeper == 0)
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chx_fatal (EVENTFLAG_ERR_TIMED_WAIT);
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chopstx_mutex_lock (&ev->mutex);
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if (!ev->flag)
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{
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ev->u.wait_usec = usec;
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chopstx_mutex_unlock (&ev->mutex);
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chopstx_usec_wait_var (&ev->u.wait_usec);
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chopstx_mutex_lock (&ev->mutex);
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ev->u.wait_usec = 0;
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}
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n = __builtin_ffs (ev->flag);
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if (n)
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{
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em = (1 << (n - 1));
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ev->flag &= ~em;
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}
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chopstx_mutex_unlock (&ev->mutex);
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return em;
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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->flag |= m;
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if (ev->sleeper)
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{
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if (ev->u.wait_usec)
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{
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ev->u.wait_usec = 0;
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chopstx_wakeup_usec_wait (ev->sleeper);
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}
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}
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else
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chopstx_cond_signal (&ev->u.cond);
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chopstx_mutex_unlock (&ev->mutex);
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}
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