dep/ACE_wrappers/ace/gethrtime.cpp

   1 // $Id: gethrtime.cpp 80826 2008-03-04 14:51:23Z wotte $
   2 //
   3 // Build this file with g++.  It can be linked in to a ACE application
   4 // that was compiled with GreenHills.  It wouldn't be necessary if I
   5 // knew a way to correctly move values from registers to a 64-bit
   6 // variable in GHS asm code.  That's easy with g++ asm.
   7
   8 #include "ace/config-all.h"
   9
  10 ACE_RCSID(ace, gethrtime, "$Id: gethrtime.cpp 80826 2008-03-04 14:51:23Z wotte $")
  11
  12 #if defined (ghs) && (defined (i386) || defined(__i386__))
  13
  14 #include "ace/OS_NS_time.h"
  15
  16 extern "C"
  17 ACE_hrtime_t
  18 ACE_GETHRTIME_NAME (void)
  19 {
  20 #if defined (ACE_HAS_PENTIUM)
  21   // ACE_TRACE ("ACE_GETHRTIME_NAME");
  22
  23 #if defined (ACE_LACKS_LONGLONG_T)
  24   double now;
  25 #else  /* ! ACE_LACKS_LONGLONG_T */
  26   ACE_hrtime_t now;
  27 #endif /* ! ACE_LACKS_LONGLONG_T */
  28
  29   // Read the high-res tick counter directly into memory variable
  30   // "now".  The A constraint signifies a 64-bit int.
  31 #if defined (__GNUG__)
  32   asm volatile ("rdtsc" : "=A" (now) : : "memory");
  33 // #elif defined (ghs)
  34 // The following doesn't work.  For now, this file must be compile with g++.
  35 //  asm ("rdtsc");
  36 //  asm ("movl %edx,-16(%ebp)");
  37 //  asm ("movl %eax,-12(%ebp)");
  38 #else
  39 # error unsupported compiler
  40 #endif
  41
  42 #if defined (ACE_LACKS_LONGLONG_T)
  43   // ACE_U_LongLong doesn't have the same layout as now, so construct
  44   // it "properly".
  45   ACE_UINT32 least, most;
  46   ACE_OS::memcpy (&least, &now, sizeof (ACE_UINT32));
  47   ACE_OS::memcpy (&most, (unsigned char *) &now + sizeof (ACE_UINT32),
  48                   sizeof (ACE_UINT32));
  49
  50   const ACE_hrtime_t ret (least, most);
  51   return ret;
  52 #else  /* ! ACE_LACKS_LONGLONG_T */
  53   return now;
  54 #endif /* ! ACE_LACKS_LONGLONG_T */
  55
  56 #else  /* ! ACE_HAS_PENTIUM */
  57 # error This file can _only_ be compiled with ACE_HAS_PENTIUM.
  58 #endif /* ! ACE_HAS_PENTIUM */
  59 }
  60 #endif /* ghs */