4D v19

CLEAR SEMAPHORE

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4D Language Reference
- Process (Communications)
- - Semaphores and signals
  - About workers
  - signal.description
  - signal.signaled
  - signal.trigger( )
  - signal.wait( )
  - CALL WORKER
  - CLEAR SEMAPHORE
  - GET PROCESS VARIABLE
  - KILL WORKER
  - New signal
  - Semaphore
  - SET PROCESS VARIABLE
  - Test semaphore
  - VARIABLE TO VARIABLE

Home

4D v19

4D Language Reference

Process (Communications)

CLEAR SEMAPHORE


CLEAR SEMAPHORE ( semaphore )

Parameter	Type	Description
semaphore	String	Semaphore to clear

Description

CLEAR SEMAPHORE erases semaphore previously set by the Semaphore function.

As a rule, all semaphores that have been created should be cleared. If semaphores are not cleared, they remain in memory until the process that creates them ends. A process can only clear semaphores that it has created. If you try to clear a semaphore from within a process that did not create it, nothing happens.

Example

See the example for Semaphore.