Returns the mutex for the specified IO operation.
INKMutex INKVIOMutexGet (INKVIO
viop
)
Gets the mutex for the IO operation described by
. The mutex for the
IO operation protects the buffer, continuation, and other VIO
members from simultaneous access. The vconnection implementor
must obtain the mutex for a VIO before accessing any of its
members. Since the VIO mutex is the same as the continuation’s
mutex, the vconnection user already holds the mutex whenever he
is running and doesn't need to worry about grabbing it. To learn more about why vconnection transformations do not need to grab the VIO mutex before accessing their write
VIO, see Transformations.viop
The mutex for the specified IO operation.
INK_ERROR_PTR
if an error occurs.