USING IN (Critical section)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

This content has been translated automatically. Click here to view the French version.

Help / WLanguage / WLanguage syntax / Structured statements

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

USING IN (Critical section)

In french: UTILISER DANS

The instruction USE ... IN instruction automatically performs initialization and termination operations on critical sections.

This statement makes it possible to "forget" these operations (mainly ending operations) and to make the code more readable for highlighting the block to which the functionality relates.

Note: If the USE ... IN INSTRUCTION instruction via a RETURN instruction, the section is automatically ended.

Example

// Utilisation d'une variable de type Section Critique
Section is CriticalSection

// Utilisation pour un bloc de code
//---------------------------
USING Section IN
	// code protégé par la section critique
	// un seul thread pourra exécuter ce code à un moment donné
END

// Utilisation d'une section critique nommée
USING CriticalSection("MaSection") IN
	// Deux threads ne pourront pas exécuter ce code en même temps
	...
END

// Section critique sur une variable
t is array <critical section> of int

USING CriticalSection(t) IN
	// Manipulations sur le tableau par un seul thread en même temps
	...
END

Syntax

Defining a critical section using a CriticalSection variable Hide the details

USING <Critical Section> IN

...
END

<USING IN>:

Marks the beginning of the statement block.

<Critical Section>: CriticalSection variable

Name of the CriticalSection variable used to identify the critical section.

Defining a global section Hide the details

USING CriticalSection() IN
...
END

<USING IN>:

Marks the beginning of the statement block.

<CriticalSection>:

Enables the critical section. For more details, see CriticalSection.

Defining a named critical section Hide the details

USING CriticalSection(<Section name>) IN

...
END

<USING IN>:

Marks the beginning of the statement block.

<CriticalSection>:

Enables the critical section. For more details, see CriticalSection.

<Section name>: Character string

Identifies the critical section. This parameter is used to identify the protected code sections.

Defining a critical section on a variable with the extension attribute "Critical section" Hide the details

USING CriticalSection(<Variable>) IN

...
END

<USING IN>:

Marks the beginning of the statement block.

<CriticalSection>:

Enables the critical section. For more details, see CriticalSection.

<Variable>: Any type

Name of WLanguage variable that must be protected in a critical section. This variable must be defined with the extension attribute <critical section>.