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| author | Kevin B Kenny <kennykb@acm.org> | 2004-06-05 17:25:39 (GMT) |
|---|---|---|
| committer | Kevin B Kenny <kennykb@acm.org> | 2004-06-05 17:25:39 (GMT) |
| commit | a1a9fa86902eae4d02cbe6b9415a3bc8e0609277 (patch) | |
| tree | 617dc620eece18a088428f04a8adc51bba840ae6 /win/tclWinTime.c | |
| parent | 82bd902b0af8b51295647f43a1610ca1f37ae613 (diff) | |
| download | tcl-a1a9fa86902eae4d02cbe6b9415a3bc8e0609277.zip tcl-a1a9fa86902eae4d02cbe6b9415a3bc8e0609277.tar.gz tcl-a1a9fa86902eae4d02cbe6b9415a3bc8e0609277.tar.bz2 | |
* generic/tcl.h: Corrected Tcl_WideInt declarations so that the mingw
build works again.
* generic/tclInt.decls: Changes to the tests for
* generic/tclIntPlatDecls.h: clock frequency in Tcl_WinTime
* generic/tclStubInit.c: so that any clock frequency
* tests/platform.test (platform-1.3): is accepted provided that
* win/tclWin32Dll.c (TclWinCPUID): all CPU's in the system share
* win/tclWinTest.c (TestwincpuidCmd): a common chip, and hence,
* win/tclWinTime.c (Tcl_GetTime): presumably, a common clock. This
change necessitated a small burst of assembly code to read CPU ID
information, which was added as TclWinCPUID in the internal Stubs. To
test this code in the common case of a single-processor machine, a
'testwincpuid' command was added to tclWinTest.c, and a test case in
platform.test. Thanks to Jeff Godfrey and Richard Suchenwirth for
reporting this bug. [Bug #976722]
Diffstat (limited to 'win/tclWinTime.c')
| -rw-r--r-- | win/tclWinTime.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/win/tclWinTime.c b/win/tclWinTime.c index faa7a3c..f428d52 100644 --- a/win/tclWinTime.c +++ b/win/tclWinTime.c @@ -9,7 +9,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclWinTime.c,v 1.14.2.4 2004/05/17 14:26:50 kennykb Exp $ + * RCS: @(#) $Id: tclWinTime.c,v 1.14.2.5 2004/06/05 17:25:40 kennykb Exp $ */ #include "tclWinInt.h" @@ -311,9 +311,39 @@ Tcl_GetTime(timePtr) * && timeInfo.nominalFreq.QuadPart != (Tcl_WideInt) 3579545 */ && timeInfo.nominalFreq.QuadPart > (Tcl_WideInt) 15000000 ) { + + /* + * As an exception, if every logical processor on the system + * is on the same chip, we use the performance counter anyway, + * presuming that everyone's TSC is locked to the same + * oscillator. + */ + + SYSTEM_INFO systemInfo; + unsigned int regs[4]; + GetSystemInfo( &systemInfo ); + if ( TclWinCPUID( 0, regs ) == TCL_OK + + && regs[1] == 0x756e6547 /* "Genu" */ + && regs[3] == 0x49656e69 /* "ineI" */ + && regs[2] == 0x6c65746e /* "ntel" */ + + && TclWinCPUID( 1, regs ) == TCL_OK + + && ( (regs[0] & 0x00000F00) == 0x00000F00 /* Pentium 4 */ + || ( (regs[0] & 0x00F00000) /* Extended family */ + && (regs[3] & 0x10000000) ) ) /* Hyperthread */ + && ( ( ( regs[1] & 0x00FF0000 ) >> 16 ) /* CPU count */ + == systemInfo.dwNumberOfProcessors ) + + ) { + timeInfo.perfCounterAvailable = TRUE; + } else { timeInfo.perfCounterAvailable = FALSE; } + } + /* * If the performance counter is available, start a thread to * calibrate it. |