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Doc: Remove mentionings of overflows from QElapsedTimer

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The last 32 timer that could overflow was not used anymore since Qt 5.9,
see also commit aaa3184f8d. This appends commit aaa3184f8d.

Pick-to: 6.3 6.2 5.15
Change-Id: If033a5fa7a58427bcbc643cc19fc73a8dd36a169
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Kai Köhne 2022-03-17 16:52:24 +01:00
parent 68c0e932a5
commit 5428c06958
1 changed files with 8 additions and 19 deletions
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27
src/corelib/kernel/qelapsedtimer.cpp
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@ -111,18 +111,6 @@ QT_BEGIN_NAMESPACE
that the clock used is the same as QElapsedTimer (see
QElapsedTimer::clockType()).
\section2 32-bit overflows
Some of the clocks used by QElapsedTimer have a limited range and may
overflow after hitting the upper limit (usually 32-bit). QElapsedTimer
deals with this overflow issue and presents a consistent timing. However,
when extracting the time since reference from QElapsedTimer, two
different processes in the same machine may have different understanding
of how much time has actually elapsed.
The information on which clocks types may overflow and how to remedy that
issue is documented along with the clock types.
\sa QTime, QTimer, QDeadlineTimer
*/
@ -138,10 +126,13 @@ QT_BEGIN_NAMESPACE
used.
\value SystemTime The human-readable system time. This clock is not monotonic.
\value MonotonicClock The system's monotonic clock, usually found in Unix systems. This clock is monotonic and does not overflow.
\value MonotonicClock The system's monotonic clock, usually found in Unix systems.
This clock is monotonic.
\value TickCounter Not used anymore.
\value MachAbsoluteTime The Mach kernel's absolute time (\macos and iOS). This clock is monotonic and does not overflow.
\value PerformanceCounter The performance counter provided by Windows. This clock is monotonic and does not overflow.
\value MachAbsoluteTime The Mach kernel's absolute time (\macos and iOS).
This clock is monotonic.
\value PerformanceCounter The performance counter provided by Windows.
This clock is monotonic.
\section2 SystemTime
@ -159,8 +150,6 @@ QT_BEGIN_NAMESPACE
arbitrary point in the past. This clock type is used on Unix systems
which support POSIX monotonic clocks (\tt{_POSIX_MONOTONIC_CLOCK}).
This clock does not overflow.
\section2 MachAbsoluteTime
This clock type is based on the absolute time presented by Mach kernels,
@ -169,14 +158,14 @@ QT_BEGIN_NAMESPACE
a POSIX monotonic clock with values differing from the Mach absolute
time.
This clock is monotonic and does not overflow.
This clock is monotonic.
\section2 PerformanceCounter
This clock uses the Windows functions \tt{QueryPerformanceCounter} and
\tt{QueryPerformanceFrequency} to access the system's performance counter.
This clock is monotonic and does not overflow.
This clock is monotonic.
\sa clockType(), isMonotonic()
*/