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qprocson() enables the put and service routines
of the driver or module whose read queue is pointed to by q.
Threads cannot enter the module instance through the put and service routines
while they are disabled.
qprocson() must be called by the open routine of
a driver or module before returning, and after any initialization necessary
for the proper functioning of the put and service routines.
qprocson() must be called before calling put(9F), putnext(9F), qbufcall(9F), qtimeout(9F), qwait(9F), or qwait_sig(9F),
qprocsoff() must be called by the close routine
of a driver or module before returning, and before deallocating any resources
necessary for the proper functioning of the put and service routines. It
also removes the queue's service routines from the service queue, and blocks
until any pending service processing completes.
The module or driver instance is guaranteed to be single-threaded
before qprocson() is called and after qprocsoff() is called, except for threads executing asynchronous events
such as interrupt handlers and callbacks, which must be handled separately.
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