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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup debug
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <stdio.h>
  36. #include <stdlib.h>
  37. #include <fibril.h>
  38. #include <async.h>
  39. #include <futex.h>
  40.  
  41. #include "fib_synch.h"
  42.  
  43. void fcv_init(fcv_t *fcv)
  44. {
  45.     int i;
  46.  
  47.     for (i = 0; i < MAX_FIB; i++) {
  48.         fcv->waiting[i] = 0;
  49.     }
  50. }
  51.  
  52. void fcv_wait(fcv_t *fcv)
  53. {
  54.     fid_t fid;
  55.     int i;
  56.  
  57.     futex_down(&async_futex);
  58.  
  59.     fid = fibril_get_id();
  60.  
  61.     for (i = 0; i < MAX_FIB; i++) {
  62.         if (fcv->waiting[i] == 0) {    
  63.             fcv->waiting[i] = fid;
  64.  
  65.             fibril_switch(FIBRIL_TO_MANAGER);
  66.             futex_up(&async_futex);
  67.            
  68.             return;
  69.         }
  70.     }
  71.  
  72.     futex_up(&async_futex);
  73.     printf("fcv_failed: too many waiting fibrils\n");
  74.     exit(1);
  75. }
  76.  
  77. void fcv_broadcast(fcv_t *fcv)
  78. {
  79.     int i;
  80.  
  81.     futex_down(&async_futex);
  82.  
  83.     for (i = 0; i < MAX_FIB; i++) {
  84.         if (fcv->waiting[i] != 0) {
  85.             fibril_add_ready(fcv->waiting[i]);
  86.             fcv->waiting[i] = 0;
  87.         }
  88.     }
  89.  
  90.     futex_up(&async_futex);
  91. }
  92.  
  93. /** @}
  94.  */
  95.