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  1. /*
  2.  * Copyright (C) 2006 Ondrej Palkovsky
  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. ipc_wait_t call_func(args)
  30. {
  31. }
  32.  
  33. ipc_wait_t fire_function(args)
  34. {
  35.     stack = malloc(stacksize);
  36.     setup(stack);
  37.     add_to_list_of_ready_funcs(stack);
  38.     if (threads_waiting_for_message)
  39.         send_message_to_self_to_one_up();
  40. }
  41.  
  42. void discard_result(ipc_wait_t funcid)
  43. {
  44. }
  45.  
  46. int wait_result(ipc_wait_t funcid);
  47. {
  48.     save_context(self);
  49. restart:
  50.     if result_available() {
  51.         if in_list_of_ready(self):
  52.             tear_off_list(self);
  53.         return retval;
  54.     }
  55.     add_to_waitlist_of(funcid);
  56.  
  57.     take_something_from_list_of_ready();
  58.     if something {
  59.        
  60.         restore_context(something);
  61.         } else { /* nothing */
  62.         wait_for_call();
  63.         if (answer) {
  64.             mark_result_ready();
  65.             put_waiting_thread_to_waitlist();
  66.  
  67.             goto restart;
  68.         }
  69.     }
  70.    
  71. }
  72.  
  73.  
  74. int ipc_call_sync(args)
  75. {
  76.     return ipc_wait(call_func(args));
  77. }
  78.