src/gallium/auxiliary/os/os_time.h

   1 /**************************************************************************
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   3  * Copyright 2008-2010 VMware, Inc.
   4  * All Rights Reserved.
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  16  * of the Software.
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  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_ */