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QTimerInfo/Unix: Fix roundToMillisecond when it's already rounded

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Don't add 1 ms when it's rounded to 1 ms.

Found when running unit tests on QNX, where the clock did not update
between two subsequent calls to clock_gettime().

All of this ought to be refactored to use std::chrono::nanoseconds.

Fixes: QTBUG-100438
Pick-to: 6.2 6.3
Change-Id: I47dc6426c33d3a66dec946ae3589694745ed1835
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
This commit is contained in:
Thiago Macieira 2022-02-10 20:06:07 -08:00
parent 407d076124
commit 47cf674477
2 changed files with 20 additions and 13 deletions
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22
src/corelib/kernel/qcore_unix_p.h
View File

@ -105,7 +105,7 @@ QT_BEGIN_NAMESPACE
Q_DECLARE_TYPEINFO(pollfd, Q_PRIMITIVE_TYPE);
// Internal operator functions for timespecs
inline timespec &normalizedTimespec(timespec &t)
constexpr inline timespec &normalizedTimespec(timespec &t)
{
while (t.tv_nsec >= 1000000000) {
++t.tv_sec;
@ -117,35 +117,35 @@ inline timespec &normalizedTimespec(timespec &t)
}
return t;
}
inline bool operator<(const timespec &t1, const timespec &t2)
constexpr inline bool operator<(const timespec &t1, const timespec &t2)
{ return t1.tv_sec < t2.tv_sec || (t1.tv_sec == t2.tv_sec && t1.tv_nsec < t2.tv_nsec); }
inline bool operator==(const timespec &t1, const timespec &t2)
constexpr inline bool operator==(const timespec &t1, const timespec &t2)
{ return t1.tv_sec == t2.tv_sec && t1.tv_nsec == t2.tv_nsec; }
inline bool operator!=(const timespec &t1, const timespec &t2)
constexpr inline bool operator!=(const timespec &t1, const timespec &t2)
{ return !(t1 == t2); }
inline timespec &operator+=(timespec &t1, const timespec &t2)
constexpr inline timespec &operator+=(timespec &t1, const timespec &t2)
{
t1.tv_sec += t2.tv_sec;
t1.tv_nsec += t2.tv_nsec;
return normalizedTimespec(t1);
}
inline timespec operator+(const timespec &t1, const timespec &t2)
constexpr inline timespec operator+(const timespec &t1, const timespec &t2)
{
timespec tmp;
timespec tmp = {};
tmp.tv_sec = t1.tv_sec + t2.tv_sec;
tmp.tv_nsec = t1.tv_nsec + t2.tv_nsec;
return normalizedTimespec(tmp);
}
inline timespec operator-(const timespec &t1, const timespec &t2)
constexpr inline timespec operator-(const timespec &t1, const timespec &t2)
{
timespec tmp;
timespec tmp = {};
tmp.tv_sec = t1.tv_sec - (t2.tv_sec - 1);
tmp.tv_nsec = t1.tv_nsec - (t2.tv_nsec + 1000000000);
return normalizedTimespec(tmp);
}
inline timespec operator*(const timespec &t1, int mul)
constexpr inline timespec operator*(const timespec &t1, int mul)
{
timespec tmp;
timespec tmp = {};
tmp.tv_sec = t1.tv_sec * mul;
tmp.tv_nsec = t1.tv_nsec * mul;
return normalizedTimespec(tmp);

11
src/corelib/kernel/qtimerinfo_unix.cpp
View File

@ -197,15 +197,22 @@ inline timespec operator+(const timespec &t1, int ms)
return t2 += ms;
}
static timespec roundToMillisecond(timespec val)
static constexpr timespec roundToMillisecond(timespec val)
{
// always round up
// worst case scenario is that the first trigger of a 1-ms timer is 0.999 ms late
int ns = val.tv_nsec % (1000 * 1000);
val.tv_nsec += 1000 * 1000 - ns;
if (ns)
val.tv_nsec += 1000 * 1000 - ns;
return normalizedTimespec(val);
}
static_assert(roundToMillisecond({0, 0}) == timespec{0, 0});
static_assert(roundToMillisecond({0, 1}) == timespec{0, 1'000'000});
static_assert(roundToMillisecond({0, 999'999}) == timespec{0, 1'000'000});
static_assert(roundToMillisecond({0, 1'000'000}) == timespec{0, 1'000'000});
static_assert(roundToMillisecond({0, 999'999'999}) == timespec{1, 0});
static_assert(roundToMillisecond({1, 0}) == timespec{1, 0});
#ifdef QTIMERINFO_DEBUG
QDebug operator<<(QDebug s, timeval tv)