Difference between revisions of "MC-Basic:SEMAPHORESTATE"
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|SEE ALSO= | |SEE ALSO= | ||
* [[Axystems:MC-Basic:SEMAPHORETAKE|SEMAPHORETAKE]] | * [[Axystems:MC-Basic:SEMAPHORETAKE|SEMAPHORETAKE]] | ||
| − | * [[ | + | * [[MC-Basic:SEMAPHOREGIVE|SEMAPHOREGIVE]] |
[[Category:Axystems:MC-Basic:Semaphore Handling|SEMAPHORESTATE]] | [[Category:Axystems:MC-Basic:Semaphore Handling|SEMAPHORESTATE]] | ||
}} | }} | ||
Revision as of 08:40, 22 May 2014
SEMSTATE returns the semaphore status : 1 , if the semaphore is taken before (busy) or 0 , if the semaphore is released .
Works for Global user-semaphores , Structure-element semaphores , the semaphores passed by-reference (within a function \ sub block).
Short form
semstate
Syntax
?semstate(<semaphore name>)
Availability
Since Version 3.7.x
Range
0 , 1
Scope
Task, Terminal
Limitations
A semaphore passed by-reference (within a function \ sub block).
Examples
-->common shared sem1 as semaphore
-->?SemState(sem1)
-->0
-->?SemTake(sem1)
-->1
-->?semstate(sem1)
-->1
-->?SemState(sem1)
-->1
-->SemGive(sem1)
-->?SemState(sem1)
-->0