Question

Parallel code execution in C?

Asked by: seemasharma22

Hi,

Is there any way in C programming we can execute some function parallely for multiple users? To be precise, I want to run multiple users simultaneously to execute same behavior. This is more like running a load test without using a load testing tool. If possible, can someone provide me with a sample code? I am not sure if this is something to do with multi threading? Also, I am not sure if C supports multithreading?

As an example, the function can be "adding a product to the shopping cart for a web based application". So this function need to execute multiple times parallely to test the load for different users.

Any help will be really appreciated. Thanks in advance!

-Seema

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Asked On
2006-09-23 at 18:17:24ID22000433
Tags

c

,

parallely

,

programming

Topic

C Programming Language

Participating Experts
3
Points
125
Comments
4

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Answers

 

by: jaime_olivaresPosted on 2006-09-23 at 18:38:55ID: 17585244

That will depend on specific OS,
For windows you have the _beginthread() or _beginthreadex() function.
For linux you have the pthread.h library

 

by: jaime_olivaresPosted on 2006-09-23 at 18:41:36ID: 17585249

For cross-platform compatibility, have a look to:
http://sources.redhat.com/pthreads-win32/

 

by: sunnycoderPosted on 2006-09-23 at 19:22:34ID: 17585335

Hi Seema,

>can execute some function parallely for multiple users?
Note that a process can only be running in context of a single user ...

Typically the kind of application that you wish to build has a client server architecture ... The server will have multiple worker threads (or processes as the need may be) which will sequentially pickup and service client requests.

i.e.
Client 1 comes up - connects to server - posts a requests - waits for response
Same for client 2, 3 ... n

Server may have a pool of free threads (as Apache web server does) or it may spawn threads/processes as requests pour in (ideal for low traffic situations since spawning is overhead and spawning too frequently would be a performance bottleneck) ...

Main server thread queues the client requests ... Workers (Threads/proccesses) pickup tasks from queue and service them until all tasks are completed.

As jamie pointed out, if you decide to go with threads, pthreads is very portable.

Cheers!
sunnycoder

 

by: alkisgPosted on 2006-09-25 at 11:55:14ID: 17595103

Which OS? Which compiler? Do you care about portability?
Be a little more specific.

You can use threads (win32, pthreads), fork, openmp, multiple program instances etc.

20120131-EE-VQP-002

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