Jeff Goldszer wrote: > This is not an LIS issue. It is just some questions pertaining to Solaris MP > Safe streams programming. I was hoping someone can point me to documentation > that has answers to these questions. > > 1) Are locks (or mutexes) allowed to be used in queue put functions? - > I assume the answer is YES.
We use them in our drivers with no problems. Watch out, though, they don't nest. > 2) In the case of a streams multiplexer driver, is an upper write put > queue function allowed to be executed on the same thread that the lower read > queue service function executing? I assume the answer is no if both > functions are allowed to protect a critical region with the same lock. They wouldn't be executed on the same thread, since a single thread can only execute in one place at a time. But Solaris STREAMS is very aggressive w.r.t. multi-threading. So I would assume that two threads could simultaneously execute ANY put or service procedures in Solaris. I have never seen the rules stated explicitly but experience seems to be that they will execute anything at any time unless you prevent it with mutexes. The only thing that I count on is that two threads won't execute the SAME put (service) procedure at the same time. -- Dave _______________________________________________ Linux-streams mailing list [EMAIL PROTECTED] http://gsyc.escet.urjc.es/mailman/listinfo/linux-streams
