108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
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/*
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* Copyright (c) 2011 Aeroflex Gaisler
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*
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* BSD license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <asm-leon/queue.h>
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/*#include <sys/fsu_pthread_queue.h>*/
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#include <asm-leon/contextswitch.h>
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#include <asm-leon/leonbare_kernel.h>
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#include <asm-leon/leonbare_debug.h>
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#include <asm-leon/stack.h>
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#include <asm-leon/leonstack.h>
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#include <asm-leon/irq.h>
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leonbare_mutex_t
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leonbare_mutex_init (leonbare_mutex_t m)
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{
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m->mx_owner_cnt = 0;
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m->mx_owner = 0;
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LBTAILQ_INIT (&(m->mx_threads));
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LEONBARE_PROTECT_KERNEL_START ();
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{
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LBTAILQ_INSERT_TAIL (LEONBARE_KR_ALLM, m, mx_allm);
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}
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LEONBARE_PROTECT_KERNEL_END ();
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}
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int
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_self__leonbare_mutex_lock (leonbare_mutex_t m, int wait)
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{
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int ret = LEONBARE_MUTEX_LOCK_OK;
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leonbare_thread_t c;
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LEONBARE_PROTECT_MUTEXSTRUCT_START (m);
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while (1)
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{
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if (LEONBARE_MUTEX_OWNER_GET (m) == 0)
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{
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LEONBARE_MUTEX_OWNER_SET (m, LEONBARE_KR_CURRENT);
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LEONBARE_MUTEX_OWNER_CNT_SET (m, 0);
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LBTAILQ_INSERT_TAIL (&c->th_mutex_locked, m, mx_locked);
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ret = LEONBARE_MUTEX_LOCK_OK;
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break;
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}
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else if (m->mx_owner == LEONBARE_KR_CURRENT)
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{
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m->mx_owner_cnt++;
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ret = LEONBARE_MUTEX_LOCK_OK;
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break;
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}
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LBTAILQ_INSERT_TAIL (&m->mx_threads, c, th_mutex);
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current_suspend ();
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}
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LEONBARE_PROTECT_MUTEXSTRUCT_END (m);
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return ret;
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}
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int
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leonbare_mutex_unlock (leonbare_mutex_t m)
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{
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int ret = LEONBARE_MUTEX_UNLOCK_ERROR;
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leonbare_thread_t c, h;
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LEONBARE_PROTECT_MUTEXSTRUCT_START (m);
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{
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c = LEONBARE_KR_CURRENT;
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if (m->mx_owner != c)
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{
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ret = LEONBARE_MUTEX_UNLOCK_OK;
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}
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else if (m->mx_owner == c && m->mx_owner_cnt)
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{
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m->mx_owner_cnt--;
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ret = LEONBARE_MUTEX_UNLOCK_OK;
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}
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else if ((h = LBTAILQ_FIRST (&m->mx_threads)))
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{
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LBTAILQ_REMOVE (&m->mx_threads, h, th_mutex);
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leonbare_thread_resume (h);
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ret = LEONBARE_MUTEX_UNLOCK_OK;
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}
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}
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LEONBARE_PROTECT_MUTEXSTRUCT_END (m);
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return ret;
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}
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