HP Advanced Communications Controllers (ACC) User's Guide Page 277

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ZCOM C I/F Library Routines
ZPORT (3X)
Chapter 4 277
Threads
Considerations
This routine may be called from multi-threaded application using the
POSIX (1003.1c) kernel threads API package. It has the following
characteristics when called by multi-threaded application:
cancellation point Thread cancellation can occur when a
thread calls this routine.
async-cancel unsafe The calling thread’s cancelability
type must be
PTHREAD_CANCEL_DEFERRED if
cancellation is enabled.
async-signal unsafe It cannot be called from a signal
handler
fork unsafe It cannot be called by a child process
after fork(2) but before exec(2).
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