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SubjectAny lightweight way for one thread to force another thread to suspend execution?
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Is there any method for one thread to force another thread to suspend
execution, then later let it resume, that is lighter weight than using
signals? I don't need it to be portable to anything other than Linux.
The suspend needs to be synchronous, but resume doesn't.

What I've thought about so far (but haven't tested) for thread A
to suspend thread B is to use a signal and two pthread conditions:

Thread A Thread B
----------------------- -----------------------
send signal to B

wait on a cond 1

enter signal handler

signal cond 1

wait on cond 2

wake up
do stuff that needs
thread B suspended

signal cond 2

continue wake up


Thanks for any suggestions!
Eric Smith



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