dillon at apollo.backplane.com
Wed Sep 24 22:19:43 PDT 2008
:Thanks. Regarding MP Lock, i was actually going through lwkt_switch() function
:in lwkt_thread.c. there mpheld is used and MP_LOCK_HELD()assign value to that variable. The
:paragraph above it tries to explain it, but it confused me.
:So i was asking when MP Lock comes into play? when to check if mp lock is held or not and so on.
That's code you will only see in the lwkt_switch() code, and nowhere
else. The lwkt_switch code has to match up the actual state of the MP
lock against the state recorded in the thread it is switching into.
In all other code the actual state of the MP lock will match the state
recorded in the thread (as part of td_pri).
<dillon at backplane.com>
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