Hi at all guys my name is Michele Rossini and i am java developer: now i'm starting to develop in C in windows enviroment with microsoft visual studio.
I have to modify an application for windows in a way that it becomes thread-safe.
Can you post me some simple examples for pleasure?
Whic are the .h to manage the thread in c for window ?
I must to do the same actitivity but in Linux,AS400 and other platform...:-(
Thank a lo in advance..
michele rossini
Is this a multi-threaded application?Originally Posted by michele.rossin
If you will be using windows thread interface, it's in windows.h.
Hi thank for the response.
No, the application that i must modify is not multithread.
I know that must use Windows.h to manage the thread ,but what are the rules to make an application multithreading in C ?
Any suggestion ?
Thank in advance
If the application is not multithreaded, then you don't need any special handling. If you want to make a multithreaded application, you need to choose if you want to use the standard template class <thread> or windows based thread.
In C, you get problems when two threads want to access the same global variable at once.
So you need to write the code to minimise use of globals, especially for writing. This includes "static" local variables. If you need any globals, protect them with
mutexs.
You might say, why not just declare a structure MYGLOBALS, populate it with the global variables, and pass it to every function? That won't solve the problem, if two threads get hold of the same pointer, you have exactly the same problem.
However most programs can be written so that most of the functionality doesn't have any threading issues. You will get problems with a few things which are inherently shared resources.
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Visual Studio is usually not recommended for C programming, because its support for anything resembling a modern C language standard was pretty lousy last time I checked. C++ is a different story though. Their C++ support is pretty good. Look at MinGW if you really want to program C on windows.
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From what I understand, VS C is based on the C89 standard (versus C99 or later). For example, local variables have to be declared at the start of a function as opposed to being able to be declared later on in a function (which C++ does allow, including Visual Studio's C++).
As for a multi-threading example using Windows threading interface (versus STL <thread>), here's a link to a zip of a Windows console program written in C that copies a file using two threads, the original thread for reading, and a created thread for writing. The code includes linked list based messaging functions used to communicate and synchronize the threads, and the messaging functions use Windows mutexes and semaphores, which requires a bit more code to setup in main(), but the rest of the code in each function is simple and small.
http://rcgldr.net/misc/mtcopy.zip
Last edited by rcgldr; 04-11-2014 at 03:56 PM.
