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