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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  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. #ifndef __SYNCH_H__
  30. #define __SYNCH_H__
  31.  
  32. #define SYNCH_NO_TIMEOUT    0   /**< Request with no timeout. */
  33. #define SYNCH_BLOCKING      0   /**< Blocking operation request. */
  34. #define SYNCH_NON_BLOCKING  1   /**< Non-blocking operation request. */
  35.  
  36. #define ESYNCH_WOULD_BLOCK  1   /**< Could not satisfy the request without going to sleep. */
  37. #define ESYNCH_TIMEOUT      2   /**< Timeout occurred. */
  38. #define ESYNCH_OK_ATOMIC    4   /**< Operation succeeded without sleeping. */
  39. #define ESYNCH_OK_BLOCKED   8   /**< Operation succeeded and did sleep. */
  40.  
  41. #define SYNCH_FAILED(rc)    ((rc) & (ESYNCH_WOULD_BLOCK | ESYNCH_TIMEOUT))
  42. #define SYNCH_OK(rc)        ((rc) & (ESYNCH_OK_ATOMIC | ESYNCH_OK_BLOCKED))
  43.  
  44. #endif
  45.