Ingo Molnar wrote:
* Russell King <[email protected]> wrote:
One per PC card socket to avoid the sysfs locking crappyness that
would otherwise deadlock, and to convert from the old unreadable state
machine implementation to a much more readable linearly coded
implementation.
Could probably be eliminated if we had some mechanism to spawn a
helper thread to do some task as required which didn't block other
helper threads until it completes.
looks like the perfect usecase for threadlets. (threadlets only use up a
separate context if necessary and can be coded in the familiar
sequential/linear model)
Same response as to Andrew: AFAICS that just increases complexity.
The simple path for programmers is writing straightforward code that
does something like
blah
msleep()
blah
or in pccardd's case,
mutex_lock()
blah
mutex_unlock()
to permit sleeping without having to write more-complex code that deals
with context transitions.
For slow-path, infrequently executed code, it is best to keep it as
simple as possible.
Jeff
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