ChronoStart (Function)

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ChronoStart (Function)

In french: ChronoDébut

Starts a stopwatch to measure the duration of a process (in milliseconds) and resets a running stopwatch. The timing is stopped:

with the ChronoEnd function.
with the ChronoPause function.

If timing is stopped, it can be restarted with ChronoResume.

The value of the stopwatch can be read at any time:

with the ChronoValue function.
via the Value property of the Chrono variable.

New in version 2025

Variables of type Chrono are now available in browser code. The syntax for handling Chrono variables also becomes available.

Example

// Démarrage du chronomètre 
ChronoStart()
MaFonction()
// Arrêt du chronomètre 
DuréeMaFonction is Duration = ChronoEnd()
Info("Le traitement MaFonction() a duré " + DuréeMaFonction)

// Démarrage du premier chronomètre 
ChronoStart(1)
// Démarrage du second chronomètre 
ChronoStart(2)
// Arrêt premier chronomètre
DuréeChronoDébut is Duration = ChronoEnd(1)
MaFonction()
// Arrêt du second chronomètre
DuréeMaFonction is Duration = ChronoEnd(2)
Info("Le traitement MaFontion() a duré " + DuréeMaFonction, ...
	"Le traitement complet a duré " + DuréeChronoDébut)

MonChrono1 is Chrono
MonChrono2 is Chrono
// Démarrage du premier chronomètre 
ChronoStart(MonChrono1)
// Démarrage du second chronomètre 
ChronoStart(MonChrono2)
// Arrêt premier chronomètre
DuréeChronoDébut is Duration = ChronoEnd(MonChrono1)
MaFonction()
// Arrêt du second chronomètre
DuréeMaFonction is Duration = ChronoEnd(MonChrono2)
Info("Le traitement MaFonction() a duré " + DuréeMaFonction, ...
	"Le traitement complet a duré " + DuréeChronoDébut)

Syntax

Timing with a stopwatch number Hide the details

ChronoStart([<Stopwatch number>])

<Stopwatch number>: Optional integer

Identifier of stopwatch used.
If this parameter is not specified, its default value is set to 1.
If this number corresponds to a running stopwatch, it is reset to zero.

This syntax is not available in PHP

Timing with a Chrono variable Hide the details

ChronoStart(<Stopwatch>)

<Stopwatch>: Chrono variable

Name of the Chrono variable that corresponds to the stopwatch to use.

Remarks

Error

A WLanguage error occurs ("The stopwatch is not started") if ChronoStart was not called before ChronoValue and ChronoEnd.

Threads and parallel tasks

Each thread (and each parallel task) includes its own stopwatches.

Two distinct threads (or two distinct parallel tasks) can perform separate timings by using the same stopwatch number.

The WLanguage error "The stopwatch is not started" will occur only if ChronoStart is not called in the same thread (or in the same parallel task) as ChronoValue and ChronoEnd.

Related Examples:

Unit examples (WINDEV): The Chrono functions

[ + ] Using the ChronoXXX functions.
These functions are used to calculate the time passed between the start (ChronoStart) and the end (ChronoEnd).

Unit examples (WINDEV): Calculations on durations

[ + ] Calculations on dates and times with the WLanguage functions:
- Calculate the duration between two moments (dates and times)
- Calculate a sum of durations
- Calculate an average of durations

Unit examples (WINDEV Mobile): The Chrono functions

[ + ] Using the WLanguage "Chrono" functions.
These functions are used to calculate the time passed between the start (ChronoStart) and the end (ChronoEnd).

Business / UI classification: Neutral code

Component: wd300vm.dll