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cwTime.cpp : Slight efficiency improvement to advanceMs().

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This commit is contained in:
kevin 2022-12-12 12:11:30 -05:00
parent 83884b5424
commit b79e8e1948
1 changed files with 15 additions and 6 deletions
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21
cwTime.cpp
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@ -42,7 +42,12 @@ void cw::time::get( spec_t& t )
#ifdef OS_LINUX #ifdef OS_LINUX
void cw::time::get( spec_t& t ) void cw::time::get( spec_t& t )
{ clock_gettime(CLOCK_REALTIME,&t); } {
// NOTcw::mutex::lock(h,timeout) relies on using
// CLOCK_REALTIME. If the source of this clock changes
// then change cw::mutex::loc(h,timeout) as well
clock_gettime(CLOCK_REALTIME,&t);
}
#endif #endif
// this assumes that the seconds have been normalized to a recent start time // this assumes that the seconds have been normalized to a recent start time
@ -209,13 +214,17 @@ void cw::time::subtractMicros( spec_t& ts, unsigned micros )
void cw::time::advanceMs( spec_t& ts, unsigned ms ) void cw::time::advanceMs( spec_t& ts, unsigned ms )
{ {
// strip off whole seconds from ms if( ms > 1000 )
unsigned sec = ms / 1000; {
// strip off whole seconds from ms
unsigned sec = ms / 1000;
// find the remaining fractional second in milliseconds // find the remaining fractional second in milliseconds
ms = (ms - sec*1000); ms = (ms - sec*1000);
ts.tv_sec += sec;
}
ts.tv_sec += sec;
ts.tv_nsec += ms * 1000000; // convert millisconds to nanoseconds ts.tv_nsec += ms * 1000000; // convert millisconds to nanoseconds
// stip off whole seconds from tv_nsec // stip off whole seconds from tv_nsec