Availability:C-language interface function
IOSTREAM * PL_acquire_stream(IOSTREAM
*s)Obtain ownership of s and return s. The
application must call PL_release_stream()
when done. Only one thread can own a stream and this call blocks if some
other thread owns the stream. Note that
PL_get_stream()
acquires ownership. This function may be called multiple times by the
same thread (recursive lock).