Difference between revisions of "MC-Basic:SEMAPHORESTATE"
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Latest revision as of 03:09, 28 April 2017
| Language: | English • 中文（简体） |
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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