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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. /** @addtogroup sync
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_SYNCH_H_
  36. #define KERN_SYNCH_H_
  37.  
  38. /** Request with no timeout. */
  39. #define SYNCH_NO_TIMEOUT    0
  40.  
  41. /** No flags specified. */
  42. #define SYNCH_FLAGS_NONE        0
  43. /** Non-blocking operation request. */
  44. #define SYNCH_FLAGS_NON_BLOCKING    (1 << 0)
  45. /** Interruptible operation. */
  46. #define SYNCH_FLAGS_INTERRUPTIBLE   (1 << 1)
  47.  
  48. /** Could not satisfy the request without going to sleep. */
  49. #define ESYNCH_WOULD_BLOCK  1
  50. /** Timeout occurred. */
  51. #define ESYNCH_TIMEOUT      2
  52. /** Sleep was interrupted. */
  53. #define ESYNCH_INTERRUPTED  4
  54. /** Operation succeeded without sleeping. */
  55. #define ESYNCH_OK_ATOMIC    8
  56. /** Operation succeeded and did sleep. */
  57. #define ESYNCH_OK_BLOCKED   16
  58.  
  59. #define SYNCH_FAILED(rc) \
  60.     ((rc) & (ESYNCH_WOULD_BLOCK | ESYNCH_TIMEOUT | ESYNCH_INTERRUPTED))
  61. #define SYNCH_OK(rc) \
  62.     ((rc) & (ESYNCH_OK_ATOMIC | ESYNCH_OK_BLOCKED))
  63.  
  64. #endif
  65.  
  66. /** @}
  67.  */
  68.