[Boost-users] [Fwd: io_service::strand - order of execution guarantees]

Subject: [Boost-users] [Fwd: io_service::strand - order of execution guarantees]
From: Chris Hite (C.Hite_at_[hidden])
Date: 2009-04-27 11:13:32

Can someone give me a guarantee about the order in which operations 
dispatched./posted to a strand are executed?

Obviously if two different threads call post() or dispatch(), there is a 
race condition.  However if one thread calls dispatch() twice, can it be 
sure that the first handler executes before the second?

What happens if post() and dispatch() are mixed?  Looking at the library 
it appears that a posted handler causes any subsequent dispatches to act 
exactly as posts.  It appears as though a strong guarantee is being made:
All handlers posted or dispatched will execute in order.

If such a useful guarantee is required internally by asio, it should be 
made public and be documented.

Christopher Hite

 
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