On 25/06/10 16:06, Dimitry Golubovsky wrote:
Should an implementation of GHC.IO.Device expect the `ready' method to
be called from a thread different than one waiting for an I/O
operation on a handle to complete, while that operation is in
progress?
As a more general question, are GHC Handles (and underlying
implementations of GHC.IO.Device and GHC.IO.BufferedIO) expected to be
thread-safe?
I would be happy to store the id of the thread that calls mkFileHandle
somewhere in the underlying `dev' and simply reject all I/O requests
that come from other threads, but is this correct/permitted behavior?
The Handle layer implements its own mutual exclusion (a Handle is an
MVar), so you only need to worry about thread-safety for your device if
you expose it some other way, or make it accessible from multiple
Handles. FD for example does no additional locking.
Cheers,
Simon
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