Unit 'syncobjs'	Package
[Overview][Constants][Types][Classes][Index]	[#fcl]

TCriticalSection

[Properties (by Name)] [Methods (by Name)] [Events (by Name)]

Critical section.

Declaration

Source position: syncobjs.pp line 78

`type TCriticalSection = class(TSynchroObject)`
`public`
`procedure Acquire; override;`		Enter the critical section.
`procedure Release; override;`		Leave the critical section.
`procedure Enter;`		Alias for `Acquire`.
`function TryEnter;`		Try and obtain the critical section.
`procedure Leave;`		Alias for `Release`.
`constructor Create;`		Create a new critical section.
`destructor Destroy; override;`		Destroy the criticalsection instance.
`end;`

Inheritance

`TCriticalSection`		Critical section.
\|
`TSynchroObject`		Abstract synchronization object.
\|
`TObject`

Description

TCriticalSection is a class wrapper around the low-level TRTLCriticalSection routines. It simply calls the RTL routines in the system unit for critical section support.

A critical section is a resource which can be owned by only 1 caller: it can be used to make sure that in a multithreaded application only 1 thread enters pieces of code protected by the critical section.

Typical usage is to protect a piece of code with the following code (MySection is a TCriticalSection instance):

// Previous code
  MySection.Acquire;
  Try
    // Protected code
  Finally
    MySection.Release;
  end;
  // Other code.

The protected code can be executed by only 1 thread at a time. This is useful for instance for list operations in multithreaded environments.

Acquire		Enter the critical section.
Release		Leave the critical section.

TCriticalSection

Declaration

Inheritance

Description

See also