[Boost-bugs] [Boost C++ Libraries] #7838: Exposing hander sizes of each call as constants.

Subject: [Boost-bugs] [Boost C++ Libraries] #7838: Exposing hander sizes of each call as constants.
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-12-29 20:11:41

#7838: Exposing hander sizes of each call as constants.
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 Reporter:  rafael_gago_81@…            |       Owner:  chris_kohlhoff
     Type:  Feature Requests            |      Status:  new           
Milestone:  To Be Determined            |   Component:  asio          
  Version:  Boost 1.52.0                |    Severity:  Cosmetic      
 Keywords:                              |  
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 Hello!

 This feature request is related to the CustomHandler api.

 As the internal handler storage size is fixed for each async api call (I
 think...), would it be possible to add constants that inform about the
 maximum size requirements of each async call?

 That would ease the implementation of segregated storage pools storing
 custom handlers, making it more suitable for realtime use.

 For example of what I'm using on x86 linux, I found that an "async_wait"
 takes 40 bytes, an "async_receive_from" 72, and an "async_send_to" 92.

 What I'm doing now is "fake calls" in initialization time, retreiving the
 requested sizes through a CustomHandler that traces the sizes, and then
 initializing the segregated storage pools with the results.

 That could easily be avoided exposing the size constants in some way.

 The current custom handler API wouldn't need to change.

 I must say that it was very wise to add the block size to the deallocation
 call, it eased things a lot, it allowed me to write safety code to forward
 the allocation/deallocation calls to the heap in case that the size
 requested wasn't the one.

 Best regards!
 Rafa.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/7838>
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