Asynchronous operations

[Julian Hershel]

Reading about asynchronous programming
(ms-help://MS.NETFrameworkSDK/cpguidenf/html/cpconasynchronousdesignpatterno
verview.htm) I could not clarify some doubts. Hope you can help me.

1) Are asynchronous programming and multithreaded programming two different
pictures? As I read the help topic above it is not clear to me if the design
pattern opens a new thread or not to run the methods asynchronously.

2) One unique thread can run methods asynchronously?

Thank you.

Julian

[Jay B. Harlow [MVP - Outlook]]

Julian,

1) Are asynchronous programming and multithreaded programming two different pictures? As I read the help topic above it is not clear to me if the design pattern opens a new thread or not to run the methods asynchronously. Asynchronous programming uses a thread from the thread pool for each
request. The thread pool only uses about 25 threads (I understand the number
may be processor & OS specific), so no more then about 25 asynchronous
requests can be handled simultaneously. Any request over the 25th
asynchronous requests would wait for a free thread in the thread pool. I
also understand that IO asynchronous requests may have their own "thread
pool", however I do not have specifics on that...
2) One unique thread can run methods asynchronously? A single thread in the thread pool may handle multiple asynchronous requests
consecutively.

Hope this helps
Jay
"Julian Hershel" <jh**************@exds.com> wrote in message
news:eY*************@tk2msftngp13.phx.gbl... Reading about asynchronous programming
(ms-help://MS.NETFrameworkSDK/cpguidenf/html/cpconasynchronousdesignpatterno verview.htm) I could not clarify some doubts. Hope you can help me.

1) Are asynchronous programming and multithreaded programming two different pictures? As I read the help topic above it is not clear to me if the design pattern opens a new thread or not to run the methods asynchronously.

2) One unique thread can run methods asynchronously?

Thank you.

Julian