native_client_sdk/src/libraries/third_party/pthreads-win32/ptw32_relmillisecs.c

   1 /*
   2  * ptw32_relmillisecs.c
   3  *
   4  * Description:
   5  * This translation unit implements miscellaneous thread functions.
   6  *
   7  * --------------------------------------------------------------------------
   8  *
   9  *      Pthreads-win32 - POSIX Threads Library for Win32
  10  *      Copyright(C) 1998 John E. Bossom
  11  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
  12  *
  13  *      Contact Email: rpj@callisto.canberra.edu.au
  14  *
  15  *      The current list of contributors is contained
  16  *      in the file CONTRIBUTORS included with the source
  17  *      code distribution. The list can also be seen at the
  18  *      following World Wide Web location:
  19  *      http://sources.redhat.com/pthreads-win32/contributors.html
  20  *
  21  *      This library is free software; you can redistribute it and/or
  22  *      modify it under the terms of the GNU Lesser General Public
  23  *      License as published by the Free Software Foundation; either
  24  *      version 2 of the License, or (at your option) any later version.
  25  *
  26  *      This library is distributed in the hope that it will be useful,
  27  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29  *      Lesser General Public License for more details.
  30  *
  31  *      You should have received a copy of the GNU Lesser General Public
  32  *      License along with this library in the file COPYING.LIB;
  33  *      if not, write to the Free Software Foundation, Inc.,
  34  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  35  */
  36
  37 #include "pthread.h"
  38 #include "implement.h"
  39 #if !defined(NEED_FTIME)
  40 #include <sys/timeb.h>
  41 #endif
  42
  43
  44 #if defined(PTW32_BUILD_INLINED)
  45 INLINE
  46 #endif /* PTW32_BUILD_INLINED */
  47 DWORD
  48 ptw32_relmillisecs (const struct timespec * abstime)
  49 {
  50   const int64_t NANOSEC_PER_MILLISEC = 1000000;
  51   const int64_t MILLISEC_PER_SEC = 1000;
  52   DWORD milliseconds;
  53   int64_t tmpAbsMilliseconds;
  54   int64_t tmpCurrMilliseconds;
  55 #if defined(NEED_FTIME)
  56   struct timespec currSysTime;
  57   FILETIME ft;
  58   SYSTEMTIME st;
  59 #else /* ! NEED_FTIME */
  60 #if ( defined(_MSC_VER) && _MSC_VER >= 1300 ) || \
  61     ( (defined(__MINGW64__) || defined(__MINGW32__)) && __MSVCRT_VERSION__ >= 0x0601 )
  62   struct __timeb64 currSysTime;
  63 #else
  64   struct _timeb currSysTime;
  65 #endif
  66 #endif /* NEED_FTIME */
  67
  68
  69   /*
  70    * Calculate timeout as milliseconds from current system time.
  71    */
  72
  73   /*
  74    * subtract current system time from abstime in a way that checks
  75    * that abstime is never in the past, or is never equivalent to the
  76    * defined INFINITE value (0xFFFFFFFF).
  77    *
  78    * Assume all integers are unsigned, i.e. cannot test if less than 0.
  79    */
  80   tmpAbsMilliseconds =  (int64_t)abstime->tv_sec * MILLISEC_PER_SEC;
  81   tmpAbsMilliseconds += ((int64_t)abstime->tv_nsec + (NANOSEC_PER_MILLISEC/2)) / NANOSEC_PER_MILLISEC;
  82
  83   /* get current system time */
  84
  85 #if defined(NEED_FTIME)
  86
  87   GetSystemTime(&st);
  88   SystemTimeToFileTime(&st, &ft);
  89   /*
  90    * GetSystemTimeAsFileTime(&ft); would be faster,
  91    * but it does not exist on WinCE
  92    */
  93
  94   ptw32_filetime_to_timespec(&ft, &currSysTime);
  95
  96   tmpCurrMilliseconds = (int64_t)currSysTime.tv_sec * MILLISEC_PER_SEC;
  97   tmpCurrMilliseconds += ((int64_t)currSysTime.tv_nsec + (NANOSEC_PER_MILLISEC/2))
  98                            / NANOSEC_PER_MILLISEC;
  99
 100 #else /* ! NEED_FTIME */
 101
 102 #if defined(_MSC_VER) && _MSC_VER >= 1400
 103   _ftime64_s(&currSysTime);
 104 #elif ( defined(_MSC_VER) && _MSC_VER >= 1300 ) || \
 105       ( (defined(__MINGW64__) || defined(__MINGW32__)) && __MSVCRT_VERSION__ >= 0x0601 )
 106   _ftime64(&currSysTime);
 107 #else
 108   _ftime(&currSysTime);
 109 #endif
 110
 111   tmpCurrMilliseconds = (int64_t) currSysTime.time * MILLISEC_PER_SEC;
 112   tmpCurrMilliseconds += (int64_t) currSysTime.millitm;
 113
 114 #endif /* NEED_FTIME */
 115
 116   if (tmpAbsMilliseconds > tmpCurrMilliseconds)
 117     {
 118       milliseconds = (DWORD) (tmpAbsMilliseconds - tmpCurrMilliseconds);
 119       if (milliseconds == INFINITE)
 120         {
 121           /* Timeouts must be finite */
 122           milliseconds--;
 123         }
 124     }
 125   else
 126     {
 127       /* The abstime given is in the past */
 128       milliseconds = 0;
 129     }
 130
 131   return milliseconds;
 132 }