Scheduler: switch to steady-clock
Obviously the better choice and a perfect fit for our requirements; while the system-clock may jump and even move backwards on time service adjustments, the steady clock just counts the ticks since last boot. In libStdC++ both are implemented as int64_t and use nanoseconds resolution
This commit is contained in:
parent
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4 changed files with 216 additions and 38 deletions
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@ -22,25 +22,26 @@
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/** @file real-clock.cpp
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** Implementation of simplified access to the current wall clock time.
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**
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** @todo just a rough draft as of 2012 / 2017
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** @todo the idea was that the vault has elaborate knowledge about
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** timings and time progression; upper layers should thus be able
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** to fulfil their timing needs by querying the vault layer
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** Implementation of simplified access to current system time.
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** Actually, a _steady clock_ is employed, with an unspecified base time,
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** typically starting anew at each system boot. The micro-tick value will
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** increase monotonously, without gaps at NTP corrections, but also without
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** any relation to an external world time.
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*/
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#include "vault/real-clock.hpp"
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#include <ctime>
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#include <chrono>
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using lib::time::FSecs;
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using std::chrono::steady_clock;
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using std::chrono::microseconds;
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using std::chrono::floor;
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namespace vault {
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#define MICRO_TICS_PER_NANOSECOND (1000*1000*1000 / TimeValue::SCALE)
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/** events during the last ms are considered "recent" for the purpose of testing */
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@ -50,17 +51,12 @@ namespace vault {
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TimeValue
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RealClock::_readSystemTime()
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{
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timespec now;
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clock_gettime(CLOCK_REALTIME, &now);
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////////////////////////////////////////////TODO shouldn't that be CLOCK_MONOTONIC ?
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////////////////////////////////////////////TODO (what happens on ntp adjustments?)
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////////////////////////////////////////////TICKET #886
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auto now = steady_clock::now();
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auto microTicks = floor<microseconds> (now.time_since_epoch())
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.count();
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gavl_time_t ticksSince1970 = now.tv_sec * TimeValue::SCALE
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+ now.tv_nsec / MICRO_TICS_PER_NANOSECOND;
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ENSURE (ticksSince1970 == _raw(TimeValue{ticksSince1970}));
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return TimeValue::buildRaw_(ticksSince1970); // bypassing the limit check
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ENSURE (microTicks == _raw(TimeValue{microTicks}));
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return TimeValue::buildRaw_(microTicks); // bypassing the limit check
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}
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@ -26,12 +26,9 @@
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** system clock with a sufficient level of precision. The result is
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** delivered in lumiera's [internal time format](\ref lib::time::Time)
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**
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** @todo As of 4/23, still just a draft, but considered an established feature
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** @todo this might be a good candidate also to provide some kind of
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** translation service, i.e. a grid to anchor a logical time value
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** with actual running wall clock time.
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** @todo not clear if this becomes some kind of central service (singleton)
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** or just a bunch of library routines
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**
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** @see lib/time/timevalue.hpp
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*/
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@ -52,7 +49,7 @@ namespace vault {
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/**
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* Convenience frontend to access the current wall clock time
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* Convenience frontend to access the current raw system time
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*/
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class RealClock
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{
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@ -63,7 +60,7 @@ namespace vault {
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static Time
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now()
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{
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return Time(_readSystemTime());
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return Time{_readSystemTime()};
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}
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static bool
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@ -227,8 +227,8 @@ namespace test {
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pullWork();
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CHECK (wasInvoked(start)); // Result: the first invocation happened immediately
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CHECK (slip_us < 300);
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CHECK (delay_us > 900); // yet this thread was afterwards kept in sleep to await the next one
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CHECK (activity::PASS == res); // instruction to re-invoke immediately
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CHECK (delay_us > 900); // yet this thread was afterwards kept in sleep to await the next task;
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CHECK (activity::PASS == res); // returns instruction to re-invoke immediately
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CHECK (not scheduler.empty()); // since there is still work in the queue
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start += t1ms; // (just re-adjust the reference point to calculate slip_us)
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@ -82232,9 +82232,11 @@ Date:   Thu Apr 20 18:53:17 2023 +0200<br/>
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<node COLOR="#338800" CREATED="1698286228019" ID="ID_1492651640" MODIFIED="1698453144418" TEXT="acquire ist korrekt (nochmal überprüft)">
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</node>
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<node COLOR="#338800" CREATED="1698286180725" ID="ID_1291141353" MODIFIED="1698453149250" TEXT="sicherstellen daß es am Ende gedropped wurde">
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<node COLOR="#338800" CREATED="1698286180725" ID="ID_1291141353" MODIFIED="1698519398914" TEXT="sicherstellen daß es am Ende gedropped wurde">
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<icon BUILTIN="button_ok"/>
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<icon BUILTIN="button_ok"/>
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</node>
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<node COLOR="#435e98" CREATED="1698453154962" ID="ID_1484610310" MODIFIED="1698454206723" TEXT="Abkürzung: weiter halten wenn PASS">
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@ -82312,13 +82314,35 @@ Date:   Thu Apr 20 18:53:17 2023 +0200<br/>
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<icon BUILTIN="bell"/>
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</node>
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</node>
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1698372042164" ID="ID_1272410719" MODIFIED="1698372168803" TEXT="Clock-Implementierung">
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<icon BUILTIN="flag-yellow"/>
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1698372415522" ID="ID_932191846" MODIFIED="1698372446765" TEXT="steady_clock verwenden">
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<node COLOR="#338800" CREATED="1698372042164" ID="ID_1272410719" MODIFIED="1698518605438" TEXT="Clock-Implementierung">
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<icon BUILTIN="button_ok"/>
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<node COLOR="#435e98" CREATED="1698372415522" ID="ID_932191846" MODIFIED="1698518065927" TEXT="steady_clock verwenden">
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<icon BUILTIN="yes"/>
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<icon BUILTIN="info"/>
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</node>
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1698372425329" ID="ID_291517829" MODIFIED="1698372449644" TEXT="könnte man auch in vault::RealClock einbauen">
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<node CREATED="1698518008302" ID="ID_1141108351" MODIFIED="1698518018620" TEXT="beide int64_t"/>
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<node CREATED="1698518031779" ID="ID_1418941928" MODIFIED="1698518054504" TEXT="high_resolution_clock ≡ Alias für system_clock"/>
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</node>
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</node>
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<node COLOR="#435e98" CREATED="1698372425329" ID="ID_291517829" MODIFIED="1698518580882" TEXT="auch gleich in vault::RealClock eingebaut">
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<node BACKGROUND_COLOR="#c8c0b6" COLOR="#1d5374" CREATED="1698518498042" ID="ID_1139060053" MODIFIED="1698518599573" TEXT="viel sauberer geworden dadurch">
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<icon BUILTIN="ksmiletris"/>
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</node>
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<node CREATED="1698518510795" ID="ID_1522430325" MODIFIED="1698518576742" TEXT="und ist wohl technisch ein drop-in">
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<richcontent TYPE="NOTE"><html>
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<head/>
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<body>
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<p>
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weil beide letztlich auf den unterliegenden Systemcall gehen; die Linux-Systemclock liefert bereits Nanosekunden-Auflösung
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</p>
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</body>
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</html></richcontent>
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</node>
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</node>
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</node>
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1698004014170" ID="ID_359097355" MODIFIED="1698203266998" TEXT="Test">
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@ -82333,8 +82357,9 @@ Date:   Thu Apr 20 18:53:17 2023 +0200<br/>
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</node>
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1697808056565" ID="ID_10043675" MODIFIED="1697808062704" TEXT="Fehlerbehandlung bedenken">
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||||
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<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1697808069219" ID="ID_1793076416" MODIFIED="1697808179770" TEXT="Grooming-Token garantiert freigeben">
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<node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1697808069219" ID="ID_1793076416" MODIFIED="1698518471734" TEXT="Grooming-Token garantiert freigeben">
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<node BACKGROUND_COLOR="#d2beaf" COLOR="#6920c0" CREATED="1697808219247" ID="ID_1041283707" MODIFIED="1697808253529" TEXT="ungeklärt: HALT an einzelne Worker?">
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@ -86261,10 +86286,30 @@ Date:   Thu Apr 20 18:53:17 2023 +0200<br/>
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<node CREATED="1694016226184" ID="ID_1179993551" MODIFIED="1694016293267" TEXT="muß absolut zuverlässeig laufen als Letztes vor Terminieren des Thread">
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<icon BUILTIN="yes"/>
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||||
</node>
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||||
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1694016294919" ID="ID_240227471" MODIFIED="1694016354350" TEXT="konkrete Impl muß Grooming-Token freigeben (sonst Deadlock möglich)">
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<node COLOR="#5b280f" CREATED="1694016294919" ID="ID_240227471" MODIFIED="1698518232337" TEXT="konkrete Impl muß Grooming-Token freigeben (sonst Deadlock möglich)">
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||||
<richcontent TYPE="NOTE"><html>
|
||||
<head/>
|
||||
<body>
|
||||
<ul>
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||||
<li>
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das Grooming-Token wird stets on-demand im Scheduler-Code erlangt
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</li>
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<li>
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Worker rufen diesen Code über die work-Function auf
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</li>
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||||
<li>
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diese hat einen maximal generischen <font face="Monospaced" color="#6a2323">catch(...)</font>- Handler
|
||||
</li>
|
||||
</ul>
|
||||
</body>
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</html></richcontent>
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1694016398145" ID="ID_1137833465" MODIFIED="1694016416375" TEXT="darüber können auch fatale Fehler kommuniziert werden">
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||||
<icon BUILTIN="idea"/>
|
||||
|
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@ -96734,8 +96779,148 @@ Date:   Thu Apr 20 18:53:17 2023 +0200<br/>
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|||
</node>
|
||||
</node>
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<node CREATED="1698509785071" ID="ID_367023996" MODIFIED="1698509794436" TEXT="ist stets eine Template-Instanz">
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|
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<body>
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<div http-equiv="content-type" content="text/html; charset=utf-8">
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<font face="Monospaced" size="2">template<<br face="Monospaced" size="2" /></font>
|
||||
|
||||
<p>
|
||||
<font face="Monospaced" size="2">    class Rep,<br face="Monospaced" size="2" />    class Period =  <a href="http://en.cppreference.com/w/cpp/numeric/ratio/ratio">std::ratio</a><1><br face="Monospaced" size="2" /></font>
|
||||
</p>
|
||||
<font face="Monospaced" size="2">> </font><font face="Monospaced" size="2" color="#391163">class <b>duration</b></font><font face="Monospaced" size="2">; </font>
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||||
</div>
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||||
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||||
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||||
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||||
<node CREATED="1698509931010" ID="ID_1755589004" MODIFIED="1698509941486" TEXT="ist ein Integer oder floating-point typ"/>
|
||||
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|
||||
</node>
|
||||
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|
||||
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||||
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|
||||
</node>
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
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||||
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||||
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||||
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|
||||
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|
||||
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||||
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</node>
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||||
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|
||||
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||||
<icon BUILTIN="clock"/>
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||||
<node CREATED="1698509490470" ID="ID_1166354595" MODIFIED="1698509492294" TEXT="API">
|
||||
<node CREATED="1698509493269" ID="ID_277517516" MODIFIED="1698509496777" TEXT="statisch: now()"/>
|
||||
<node CREATED="1698511651646" ID="ID_729262634" MODIFIED="1698512331821" TEXT="constexpr static: is_steady"/>
|
||||
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|
||||
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|
||||
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|
||||
<node CREATED="1698509560812" ID="ID_590462425" MODIFIED="1698512427154" TEXT="Period als compile-Time std::ratio of 1"/>
|
||||
<node CREATED="1698509614721" ID="ID_891145455" MODIFIED="1698509618696" TEXT="time_point">
|
||||
<node CREATED="1698509619509" ID="ID_216113768" MODIFIED="1698509628660" TEXT="per Template-Arg an die Clock gebunden"/>
|
||||
<node CREATED="1698509643003" ID="ID_555660236" MODIFIED="1698509747546">
|
||||
<richcontent TYPE="NODE"><html>
|
||||
<head/>
|
||||
<body>
|
||||
<p style="text-align: right">
|
||||
<u>Beispiel steady_clock</u>
|
||||
</p>
|
||||
<p>
|
||||
<font color="#382a6e" face="Monospaced" size="2">using time_point = chrono::time_point<steady_clock, steady_clock::duration></font>
|
||||
</p>
|
||||
</body>
|
||||
</html></richcontent>
|
||||
<icon BUILTIN="idea"/>
|
||||
</node>
|
||||
</node>
|
||||
</node>
|
||||
</node>
|
||||
<node CREATED="1698509191197" ID="ID_1356397278" MODIFIED="1698509201128" TEXT="System-Clock">
|
||||
<node CREATED="1698509319928" ID="ID_44478916" MODIFIED="1698509324928" TEXT="hat zusätzliche Funktionen">
|
||||
<node CREATED="1698509341937" ID="ID_1046747441" MODIFIED="1698509351084" TEXT="Zeit Formatieren / IO"/>
|
||||
<node CREATED="1698509353439" ID="ID_1183159748" MODIFIED="1698509365770" TEXT="Konv. zu time_t (für C APIs)"/>
|
||||
</node>
|
||||
<node CREATED="1698509441280" ID="ID_217512931" MODIFIED="1698509451740" TEXT="kann Sprünge machen bei NTP-Adjustments"/>
|
||||
<node CREATED="1698509453299" ID="ID_550403574" MODIFIED="1698509474932" TEXT="typischerweise: Nanosec since »Unix-Epoch« (1.1.1970)"/>
|
||||
</node>
|
||||
<node CREATED="1698509202212" ID="ID_790803121" MODIFIED="1698509207431" TEXT="Steady-Clock">
|
||||
<node CREATED="1698509208331" ID="ID_591620752" MODIFIED="1698509217401" TEXT="ist garantiert monoton wachsend"/>
|
||||
<node CREATED="1698509218162" ID="ID_596220520" MODIFIED="1698509233539" TEXT="keinerlei Angaben zum Zeitnullpunkt"/>
|
||||
<node CREATED="1698509274790" ID="ID_429550366" MODIFIED="1698509311899" TEXT="kann z.B. Ticks seit letztem Boot sein"/>
|
||||
</node>
|
||||
<node CREATED="1698511615579" ID="ID_1031342236" MODIFIED="1698511622222" TEXT="High-Resolution-Clock">
|
||||
<node CREATED="1698511623066" ID="ID_943634419" MODIFIED="1698511631172" TEXT="ist etwas fragwürdig"/>
|
||||
<node CREATED="1698511631628" ID="ID_565001872" MODIFIED="1698511644794" TEXT="da keine Festlegung, ob monotonic"/>
|
||||
</node>
|
||||
<node CREATED="1698508991193" ID="ID_36572696" MODIFIED="1698511601168" TEXT="Stand(libstdc++ 8)">
|
||||
<icon BUILTIN="back"/>
|
||||
<node CREATED="1698509386500" ID="ID_543938648" MODIFIED="1698509396728" TEXT="alle Clocks haben Nano-Ticks"/>
|
||||
<node CREATED="1698509397570" ID="ID_697985650" MODIFIED="1698509405605" TEXT="rep = int64_t"/>
|
||||
<node CREATED="1698509409721" ID="ID_1625495674" MODIFIED="1698509436425" TEXT="high_resolution_clock ist alias ⟶ System-Clock"/>
|
||||
</node>
|
||||
</node>
|
||||
</node>
|
||||
<node COLOR="#435e98" CREATED="1698512950960" FOLDED="true" ID="ID_389621636" MODIFIED="1698517957017" TEXT="Umwandlungen">
|
||||
<icon BUILTIN="info"/>
|
||||
<node CREATED="1698513121905" ID="ID_1567041783" MODIFIED="1698513133305" TEXT="duration-Konstruktor">
|
||||
<node CREATED="1698513135055" ID="ID_540706165" MODIFIED="1698513150985" TEXT="möglich wenn Basis-Typen direkt kompatibel"/>
|
||||
<node CREATED="1698513151348" ID="ID_1794770890" MODIFIED="1698513179245" TEXT="und ganzzahliges Divisionsverhältnis"/>
|
||||
</node>
|
||||
<node CREATED="1698513112016" ID="ID_1108519346" MODIFIED="1698513120179" TEXT="duration_cast<ToDuration>">
|
||||
<node CREATED="1698516509446" ID="ID_1945968798" MODIFIED="1698516515393" TEXT="macht einen floor()"/>
|
||||
</node>
|
||||
<node CREATED="1698512955343" ID="ID_1223227649" MODIFIED="1698512969362" TEXT="timepoint_cast<ToDuration>"/>
|
||||
<node CREATED="1698513313391" ID="ID_252535572" MODIFIED="1698513346664" TEXT="Rundungs-Umwandlungen">
|
||||
<linktarget COLOR="#677d8a" DESTINATION="ID_252535572" ENDARROW="Default" ENDINCLINATION="-90;-144;" ID="Arrow_ID_1740457437" SOURCE="ID_1612837076" STARTARROW="None" STARTINCLINATION="-164;13;"/>
|
||||
<node CREATED="1698512656551" ID="ID_1370779068" MODIFIED="1698516529207" TEXT="floor()"/>
|
||||
<node CREATED="1698512665366" ID="ID_472310839" MODIFIED="1698516533023" TEXT="ceil()"/>
|
||||
<node CREATED="1698512673517" ID="ID_117446943" MODIFIED="1698516538022" TEXT="round()"/>
|
||||
<node CREATED="1698516539145" ID="ID_206449756" MODIFIED="1698516550270" TEXT="arbeitet auf duration und time_point">
|
||||
<node CREATED="1698512850622" ID="ID_510318894" MODIFIED="1698516618484" TEXT="liefert dann Duration oder Time-point mit einer anderen Period / Rep"/>
|
||||
</node>
|
||||
<node CREATED="1698512818089" ID="ID_1130528368" MODIFIED="1698512832972" TEXT="1. Template-Parameter mandatory: ToDuration"/>
|
||||
</node>
|
||||
</node>
|
||||
<node COLOR="#435e98" CREATED="1698511477688" FOLDED="true" HGAP="32" ID="ID_1964801588" MODIFIED="1698517960542" TEXT="vordefinierte Skalen und Konstanten">
|
||||
<icon BUILTIN="info"/>
|
||||
<node CREATED="1698511502393" ID="ID_636370937" MODIFIED="1698511512348" TEXT="vordefinierte Durations">
|
||||
<node CREATED="1698511513128" ID="ID_1453047706" MODIFIED="1698511515028" TEXT="seconds"/>
|
||||
<node CREATED="1698511515573" ID="ID_422667456" MODIFIED="1698511518723" TEXT="milliseconds"/>
|
||||
<node CREATED="1698511519215" ID="ID_1395948719" MODIFIED="1698511522880" TEXT="microseconds"/>
|
||||
<node CREATED="1698511523319" ID="ID_1025078381" MODIFIED="1698511524907" TEXT="...."/>
|
||||
</node>
|
||||
<node CREATED="1698511529358" ID="ID_1905315767" MODIFIED="1698511545616" TEXT="vordefinierte Literal-Operatoren">
|
||||
<node CREATED="1698511546844" ID="ID_810245100" MODIFIED="1698511551854" TEXT="std::chrono_literals"/>
|
||||
<node CREATED="1698511552452" ID="ID_980003726" MODIFIED="1698511559006" TEXT="Literal-Schreibweise">
|
||||
<node CREATED="1698511559795" ID="ID_208097384" MODIFIED="1698511561099" TEXT="10s"/>
|
||||
<node CREATED="1698511561634" ID="ID_595245063" MODIFIED="1698511566629" TEXT="120ms"/>
|
||||
<node CREATED="1698511567177" ID="ID_697515798" MODIFIED="1698511568124" TEXT="..."/>
|
||||
</node>
|
||||
</node>
|
||||
</node>
|
||||
<node CREATED="1482365448257" ID="ID_1648116305" MODIFIED="1557498707240">
|
||||
<richcontent TYPE="NODE"><html>
|
||||
|
|
|
|||
Loading…
Reference in a new issue