Re: The cost of pthread-mutexes or corresponding...

[Richard Levitte - VMS Whacker]

From: Dr S N Henson <[EMAIL PROTECTED]>

drh> I can see a couple of ways to handle this. One is to let the callbacks
drh> handle everything: add an extra argument that passes the address of the
drh> structure associated with the lock and let them use it as an opaque ID
drh> and handle a lock pool as it sees fit.

That will be a problem.  Consider realloc().

drh> Alternatively we could add a field to the relevant structures a bit like
drh> the current "references" which is an opaque pointer or contains an
drh> opaque pointer which the lock callback can use for whatever purpose it
drh> wants.

That's basically already possible today, with little extra code,
through the dynlock functions.

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