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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2008-2010 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28. /**
  29.  * @file
  30.  * OS independent time-manipulation functions.
  31.  *
  32.  * @author Jose Fonseca <jfonseca@vmware.com>
  33.  */
  34.  
  35. #ifndef _OS_TIME_H_
  36. #define _OS_TIME_H_
  37.  
  38.  
  39. #include "pipe/p_config.h"
  40.  
  41. #if defined(PIPE_OS_UNIX)
  42. #  include <unistd.h> /* usleep */
  43. #endif
  44.  
  45. #include "pipe/p_compiler.h"
  46.  
  47.  
  48. #ifdef  __cplusplus
  49. extern "C" {
  50. #endif
  51.  
  52.  
  53. /*
  54.  * Get the current time in nanoseconds from an unknown base.
  55.  */
  56. int64_t
  57. os_time_get_nano(void);
  58.  
  59.  
  60. /*
  61.  * Get the current time in microseconds from an unknown base.
  62.  */
  63. static INLINE int64_t
  64. os_time_get(void) {
  65.     return os_time_get_nano() / 1000;
  66. }
  67.  
  68.  
  69. /*
  70.  * Sleep.
  71.  */
  72. #if defined(PIPE_OS_UNIX)
  73. #define os_time_sleep(_usecs) usleep(_usecs)
  74. #else
  75. void
  76. os_time_sleep(int64_t usecs);
  77. #endif
  78.  
  79.  
  80. /*
  81.  * Helper function for detecting time outs, taking in account overflow.
  82.  *
  83.  * Returns true if the current time has elapsed beyond the specified interval.
  84.  */
  85. static INLINE boolean
  86. os_time_timeout(int64_t start,
  87.                 int64_t end,
  88.                 int64_t curr)
  89. {
  90.    if(start <= end)
  91.       return !(start <= curr && curr < end);
  92.    else
  93.       return !((start <= curr) || (curr < end));
  94. }
  95.  
  96.  
  97. #ifdef  __cplusplus
  98. }
  99. #endif
  100.  
  101. #endif /* _OS_TIME_H_ */
  102.