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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
// $Id: gethrtime.cpp 91286 2010-08-05 09:04:31Z johnnyw $
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//
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// Build this file with g++. It can be linked in to a ACE application
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// that was compiled with GreenHills. It wouldn't be necessary if I
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// knew a way to correctly move values from registers to a 64-bit
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// variable in GHS asm code. That's easy with g++ asm.
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#include "ace/config-all.h"
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#if defined (ghs) && (defined (i386) || defined(__i386__))
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#include "ace/OS_NS_time.h"
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extern "C"
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ACE_hrtime_t
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ACE_GETHRTIME_NAME (void)
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{
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#if defined (ACE_HAS_PENTIUM)
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// ACE_TRACE ("ACE_GETHRTIME_NAME");
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#if defined (ACE_LACKS_LONGLONG_T)
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double now;
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#else /* ! ACE_LACKS_LONGLONG_T */
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ACE_hrtime_t now;
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#endif /* ! ACE_LACKS_LONGLONG_T */
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// Read the high-res tick counter directly into memory variable
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// "now". The A constraint signifies a 64-bit int.
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#if defined (__GNUG__)
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asm volatile ("rdtsc" : "=A" (now) : : "memory");
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// #elif defined (ghs)
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// The following doesn't work. For now, this file must be compile with g++.
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// asm ("rdtsc");
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// asm ("movl %edx,-16(%ebp)");
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// asm ("movl %eax,-12(%ebp)");
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#else
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# error unsupported compiler
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#endif
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#if defined (ACE_LACKS_LONGLONG_T)
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// ACE_U_LongLong doesn't have the same layout as now, so construct
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// it "properly".
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ACE_UINT32 least, most;
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ACE_OS::memcpy (&least, &now, sizeof (ACE_UINT32));
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ACE_OS::memcpy (&most, (unsigned char *) &now + sizeof (ACE_UINT32),
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sizeof (ACE_UINT32));
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const ACE_hrtime_t ret (least, most);
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return ret;
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#else /* ! ACE_LACKS_LONGLONG_T */
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return now;
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#endif /* ! ACE_LACKS_LONGLONG_T */
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#else /* ! ACE_HAS_PENTIUM */
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# error This file can _only_ be compiled with ACE_HAS_PENTIUM.
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#endif /* ! ACE_HAS_PENTIUM */
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}
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#endif /* ghs */
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