LibpThread +Example - Using P.I.P.S OECORE

This example application shows, using a P.I.P.S. (P.I.P.S. Is POSIX on +Symbian OS) program, the use of the LibpThread library to demonstrate simple +multi-threading and synchronisation.

The purpose is to create a basic multithreading example showing the usage +of the LibpThread APIs. This example also shows how multi-threading is used +to achieve concurrency in tasks and sharing of resources.

Download

Click +on the following link to download the example: LibpThreadExample.zip

Click: browse to view the example code.

Description

The following sections provide more +information about the steps that the example performs.

Thread +Synchronisation

The example creates three threads named ThreadOne, +ThreadTwo and ThreadThree. The threads write "One", "Two" and "Three" five +times in a text file. The text file, located in epoc32\winscw\c\newfile.txt, +is used as a shared resource for all three threads. A mutex is used to ensure +that first ThreadOne writes in the file, then ThreadTwo and then ThreadThree. +If the mutex is not used all the threads can simultaneously write in the file. +This can be seen by commenting out pthread_mutex_lock and pthread_mutex_unlock in +the code.

Related APIs

pthread_mutex_lock

pthread_mutex_unlock

pthread_join

pthread_mutex_t

Build

The Symbian +OS build process describes how to build this example application.

The +example builds an executable called LibpThreadExample.exe in +the standard locations.

To run the example, start LibpThreadExample.exe from +the file system or from your IDE. After launching the executable, depending +on the emulator you are using, you may need to navigate away from the application +launcher or shell screen to view the console.