multithreading

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Hi
I have written a program which receives mails from server using POP3.
it's downloading sequentially. now i want to use the multithreading
in this regard where i can create threads for each and every
mail...and download those mails simaltaneously.
if u have any idea please help me out.
Regards
request
 
On 16 Mar 2005 07:37:16 -0600,
Hi
I have written a program which receives mails from server using POP3.
it's downloading sequentially. now i want to use the multithreading
in this regard where i can create threads for each and every
mail...and download those mails simaltaneously.
if u have any idea please help me out.
Click to expand...

First, be careful to to share resources without synchronization: two
threads shouldn't write to the same file simultaneously, for example.
Mutexes, critical sections and semaphores can be useful for this,
depending on the circumstances.

I would look around on SourceForge, CodeProject, and CodeGuru for
projects that do similar things -- perhaps as servers -- and learn
about synchronization between threads.

Since your application is a client, it can start a thread for each
POP3 server. If the e-mails are being written to separate files, you
only need to coordinate file names between the threads; if appended to
a single mailbox thread, then the threads will have to wait for each
other to finish writing a message before beginning to write their own.

Another option would be for each receiver thread to write each message
to a temp file. An additional thread would be signaled when a file is
complete and append it to the inbox.

I hope this helps and gives you some ideas.
 
request said:
Hi
I have written a program which receives mails from server using POP3.
it's downloading sequentially. now i want to use the multithreading
in this regard where i can create threads for each and every
mail...and download those mails simaltaneously.
if u have any idea please help me out.
Click to expand...


Idea about what? At first, opening a connection for each email
separately doesn't sound good, first because it would increase the load
on server, and second because it may look like a password attack and I
do not know if all servers will allow many connections from the same
address (mine wouldn't). :-)
 
Idea about what? At first, opening a connection for each email
separately doesn't sound good, first because it would increase the load
on server, and second because it may look like a password attack and I
do not know if all servers will allow many connections from the same
address (mine wouldn't). :-)
Click to expand...

I assumed he meant different POP3 servers or at least accounts (I use
3 servers and 5 accounts). I don't think the POP3 protocol even allows
multiple connections to the same account.
 
On Wed, 16 Mar 2005 17:26:02 GMT, Severian

I have corrected several typos in my response below. Then I must go do
some real work until my brain starts working properly again!

(I am assuming you are downloading from multiple servers
simultaneously, and not trying to download a bunch of messages from a
single account; I don't believe POP3 even supports the latter)

First, be careful *not* to share resources without synchronization:
two threads shouldn't write to the same file simultaneously, for
example. Mutexes, critical sections and semaphores can be useful for
this, depending on the circumstances.

I would look around on SourceForge, CodeProject, and CodeGuru for
projects that do similar things -- perhaps as servers -- and learn
about synchronization between threads.

Since your application is a client, it can start a thread for each
POP3 server. If the e-mails are being written to separate files, you
only need to coordinate file names between the threads; if appended to
a single mailbox *file*, then the threads will have to wait for each
other to finish writing a message before beginning to write their own.

Another option would be for each receiver thread to write each message
to a temp file. An additional thread would be signaled when a file is
complete and append it to the inbox.

I hope this helps and gives you some ideas.
 
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