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POcondition variable - why calling pthread_cond_signal() before calling pthread_cond_wait() is a logical error?
primarykey
Id
5536759
data
AcceptedAnswerId
5538447
AnswerCount
4
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-04-04T09:35:45.970
FavoriteCount
11
LastActivityDate
2018-06-09T10:36:33.597
LastEditDate
2015-08-27T07:26:00.167
LastEditorUserId
963864
OwnerUserId
419889
ParentId
0
PostTypeId
1
Score
23
ViewCount
19929
LastEditorDisplayName
text
Body
It's written in POSIX threads tutorial <a href="https://computing.llnl.gov/tutorials/pthreads/" rel="noreferrer">https://computing.llnl.gov/tutorials/pthreads/</a> that it is a logical error. my question is why it is a logical error? In my program i need to use these signals, however i cannot guarantee that there will be a thread that will be in _cond_wait state. I tried to test it and nothing happens. Is this can cause unexpected behavior or worse? thank you! 
Tags
<c++><c><pthreads><condition-variable>
Title
condition variable - why calling pthread_cond_signal() before calling pthread_cond_wait() is a logical error?
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1. PO
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 PTAnswer
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PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. UScuriousguy
UserOwnerUserId
1. USAsher Saban
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1. PO
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 POcondition variable - why calling pthread_cond_signal() before calling pthread_cond_wait() is a logical error?
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 POcondition variable - why calling pthread_cond_signal() before calling pthread_cond_wait() is a logical error?
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 POcondition variable - why calling pthread_cond_signal() before calling pthread_cond_wait() is a logical error?
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