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Improve QElapsedTimer resolution on QNX

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The standard POSIX clock functions are present on QNX, but only
return timing information with millisecond accuracy.  To get
accuracy beyond that, platform-specific functions must be used.

Change-Id: I54a0550f1865dbea3c60a86ecd8ad99df3fe42b4
Reviewed-by: Frank Osterfeld <frank.osterfeld@kdab.com>
Reviewed-by: Bernd Weimer <bweimer@blackberry.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
This commit is contained in:
Matt Fischer 2014-10-14 16:57:20 -05:00
parent 6451c4baeb
commit 82c2118cba
1 changed files with 17 additions and 2 deletions
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19
src/corelib/tools/qelapsedtimer_unix.cpp
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@ -35,8 +35,12 @@
#define _POSIX_C_SOURCE 200809L
#include "qelapsedtimer.h"
#ifdef Q_OS_VXWORKS
#if defined(Q_OS_VXWORKS)
#include "qfunctions_vxworks.h"
#elif defined(Q_OS_QNX)
#include <sys/neutrino.h>
#include <sys/syspage.h>
#include <inttypes.h>
#else
#include <sys/time.h>
#include <time.h>
@ -84,7 +88,18 @@ QT_BEGIN_NAMESPACE
* see http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getres.html
*/
#ifndef CLOCK_REALTIME
#if defined(Q_OS_QNX)
static inline void qt_clock_gettime(clockid_t clock, struct timespec *ts)
{
// The standard POSIX clock calls only have 1ms accuracy on QNX. To get
// higher accuracy, this platform-specific function must be used instead
quint64 cycles_per_sec = SYSPAGE_ENTRY(qtime)->cycles_per_sec;
quint64 cycles = ClockCycles();
ts->tv_sec = cycles / cycles_per_sec;
quint64 mod = cycles % cycles_per_sec;
ts->tv_nsec = mod * Q_INT64_C(1000000000) / cycles_per_sec;
}
#elif !defined(CLOCK_REALTIME)
# define CLOCK_REALTIME 0
static inline void qt_clock_gettime(int, struct timespec *ts)
{