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Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 54 |
1 files changed, 54 insertions, 0 deletions
@@ -1,3 +1,57 @@ +2000-11-21 Andreas Kupries <a.kupries@westend.com> + + * All of the changes below are described in TIP #7 ~ Specification + and result from the application of the patch contained + therein. Creator of the patch is Kevin Kenny + <kennykb@crd.ge.com>. The patch used here is actually a bit + different. Two MS specific constant values (format FOOui64) were + replaced with a more portable formatting of the values and an + additional cast to LONGLONG. My cross-compiling gcc was unable to + process the original form. The SF Id of the patch is 102459. + + * tclWinTime.c: Add to the static data a set of variables that + manage the phase-locked techniques, including a + ''CRITICAL_SECTION'' to guard them so that multi-threaded code + is stable. + + * tclWinTime.c: Modify ''TclpGetSeconds'' to call ''TclpGetTime'' + and return the 'seconds' portion of the result. This change is + necessary to make sure that the two times are consistent near + the rollover from one second to another. + + * tclWinTime.c: Modify ''TclpGetClicks'' to use TclpGetTime to + determine the click count as a number of microseconds. + + * tclWinTime.c: Modify ''TclpGetTime'' to return the time as + M*Q+B, where Q is the result of ''QueryPerformanceCounter'', and + M and B are variables maintained by the phase-locked loop to + keep the result as close as possible to the system clock. The + ''TclpGetTime'' call will also launch the phase-lock management + in a separate thread the first time that it is invoked. If the + performance counter is unavailable, or if its frequency is not + one of the two common 8254-compatible rates, then + ''TclpGetTime'' will return the result of ''ftime'' as it does + in Tcl 8.3.2. + + * tclWinTime.c: Add the clock calibration procedure. The + calibration is somewhat complex; to save space, the reader is + referred to the reference implementation for the details of how + the time base and frequency are maintained. + + * tclWinNotify.c: Modify ''Tcl_Sleep'' to test that the process + has, in fact, slept for the requisite time by calling + ''TclpGetTime'' and comparing with the desired time. Otherwise, + roundoff errors may cause the process to awaken early. + + * tclWinTest.c: Add a ''testwinclock'' command. This command + returns a four element list comprising the seconds and + microseconds portions of the system clock and the seconds and + microseconds portions of the Tcl clock. + + * winTime.test: Add to the test suite a test that makes sure that + the Tcl clock stays within 1.1 ms of the system clock over the + duration of the test. + 2000-11-21 Donal K. Fellows <fellowsd@cs.man.ac.uk> * doc/global.n: |