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in Codesys v.2 help there is a warning that string functions are not thread safe and the same function shouldn't be used in different tasks because there is a danger of overwriting.
My question is, does this apply to all string functions - including LEN and FIND, which return INT - or only to the rest (LEFT, CONCAT etc.) that return STRING ? Can I safely use LEN and FIND from different tasks or they may return a wrong number?
Thanks.
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BTW is it possible a task switching to occur while a function executes, if there are no tasks triggered by events?
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dont worry to much.
it indeed has to do with interupts etc. However just dont change a string in a interupt.
when doing a for next loop it can be interupted. but if you have no interupts running it is no problem, as a function is completed (or a rung is done, however multilines are not obvious)
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi,
in Codesys v.2 help there is a warning that string functions are not thread safe and the same function shouldn't be used in different tasks because there is a danger of overwriting.
My question is, does this apply to all string functions - including LEN and FIND, which return INT - or only to the rest (LEFT, CONCAT etc.) that return STRING ? Can I safely use LEN and FIND from different tasks or they may return a wrong number?
Thanks.
--
BTW is it possible a task switching to occur while a function executes, if there are no tasks triggered by events?
dont worry to much.
it indeed has to do with interupts etc. However just dont change a string in a interupt.
when doing a for next loop it can be interupted. but if you have no interupts running it is no problem, as a function is completed (or a rung is done, however multilines are not obvious)