Re: Locking down a socket, milestone 1

On Wed, 24 Apr 2002 08:57:41 -0400,
  Bosko Milekic <[e-mail]> said:

bmilekic> I've literally just had time to glance at this so far, but can you, if
bmilekic> you don't mind, please just briefly explain what BSD/OS does with
bmilekic> sockbuf locking (do they use the same lock, or...?)

In BSD/OS, each of the sockbufs in a socket has a mutex.  It protects
the data in the sockbuf.  In addition, the mutex of the receive
sockbuf also protects the whole data of the socket as well.  BSD/OS
seems to have no global locks to protect the relation between sockets.

One thing I am not sure is the lock requirement upon waking up a
process tsleeping for socket operation.  In BSD/OS, some parts wake
up processes with a socket locked, while the other parts not.  I am
going to make all of the functions calling sowakeup() to lock a socket
first.

-- 
Seigo Tanimura <[e-mail]> <[e-mail]>

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