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Document timer accuracy behavior on UNIX.

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Change-Id: I5e8b383cc4d8ce0d249be164c5ef596328bdc50c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Bradley T. Hughes 2012-01-10 13:43:51 +01:00 committed by Qt by Nokia
parent 46b2e5f37d
commit 7776beacf7
1 changed files with 9 additions and 1 deletions
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10
src/corelib/global/qnamespace.qdoc
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@ -2876,9 +2876,17 @@
\value CoarseTimer Coarse timers try to keep accuracy within 5% of the desired interval \value CoarseTimer Coarse timers try to keep accuracy within 5% of the desired interval
\value VeryCoarseTimer Very coarse timers only keep full second accuracy \value VeryCoarseTimer Very coarse timers only keep full second accuracy
On UNIX (including Linux and Mac OS X), Qt will keep millisecond accuracy
for Qt::PreciseTimer. For Qt::CoarseTimer, the interval will be adjusted up
to 5% to align the timer with other timers that are expected to fire at or
around the same time. The objective is to make most timers wake up at the
same time, thereby reducing CPU wakeups and power consumption.
On Windows, Qt will use Windows's Multimedia timer facility (if available) On Windows, Qt will use Windows's Multimedia timer facility (if available)
for Qt::PreciseTimer and normal Windows timers for Qt::CoarseTimer and for Qt::PreciseTimer and normal Windows timers for Qt::CoarseTimer and
Qt::VeryCoarseTimer. The interval for Qt::VeryCoarseTimer is rounded to the Qt::VeryCoarseTimer.
On all platforms, the interval for Qt::VeryCoarseTimer is rounded to the
nearest full second (e.g. an interval of 23500ms will be rounded to nearest full second (e.g. an interval of 23500ms will be rounded to
24000ms, and 20300ms to 20000ms). 24000ms, and 20300ms to 20000ms).
*/ */