Trace uses impresice timer in POSIX
-----------------------------------
Key: CORE-3970
URL: http://tracker.firebirdsql.org/browse/CORE-3970
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.1, 2.5.0, 3.0 Initial
Environment: POSIX OS
Reporter: Dmitriy Starodubov
Priority: Minor
There is query_performance_counter/query_performance_frequency functions, used
by trace:
#if defined(WIN_NT)
...
#elif defined(HAVE_CLOCK_GETTIME)
// Use high-resolution clock
struct timespec tp;
if (clock_gettime(CLOCK_REALTIME, &tp) != 0)
return 0;
return static_cast<SINT64>(tp.tv_sec) * BILLION + tp.tv_nsec;
#else
// This is not safe because of possible wrapping and very imprecise
return clock();
#endif
But HAVE_CLOCK_GETTIME marco is not defined in POSIX (at least in CentOS 6.2,
Mandriva 2010.2, OpenSuSE 11.1).
So trace use imprecise timer although high-resolution clock is available in
librt.so.
I suppose to add in configure.in something like this:
AC_CHECK_LIB(rt, clock_gettime, XE_APPEND(-lrt, LIBS);
AC_DEFINE(HAVE_CLOCK_GETTIME, 1,
[Define this if clock_gettime works on the platform]))
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