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<concept id="GUID-092C18D4-A525-5562-9BF6-41435E400290" xml:lang="en"><title>LibpThread
Example - Using P.I.P.S OECORE </title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>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. </p>
<p>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. </p>
<section id="GUID-026FD8D6-6C4A-5958-B289-775D4AE1E756"><title>Download</title> <p>Click
on the following link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-84e8baf2-57f1-4255-aeb8-a6ed0ed2145e.zip" scope="external"> LibpThreadExample.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-84e8baf2-57f1-4255-aeb8-a6ed0ed2145e.html" scope="peer">browse</xref> to view the example code. </p> </section>
<section><title>Description</title> <p>The following sections provide more
information about the steps that the example performs. </p> <p><b> Thread
Synchronisation</b> </p> <p>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 <filepath>epoc32\winscw\c\newfile.txt</filepath>,
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 <codeph>pthread_mutex_lock</codeph> and <codeph>pthread_mutex_unlock</codeph> in
the code. </p> </section>
<section><title>Related APIs</title><p><xref href="GUID-736D5209-CD86-324C-BAB0-7B15C3D1862D.dita"><apiname>pthread_mutex_lock</apiname></xref> </p><p><xref href="GUID-9D7CD10C-F958-3792-8888-B7F39B148302.dita"><apiname>pthread_mutex_unlock</apiname></xref> </p><p><xref href="GUID-3A89E849-DD7F-3381-9469-6CD89892E616.dita"><apiname>pthread_join</apiname></xref></p><p><xref href="GUID-889CB456-6980-3B92-9350-0C6C8C9AC435.dita"><apiname>pthread_mutex_t</apiname></xref></p></section>
<section><title>Build</title> <p>The <xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">Symbian
OS build process</xref> describes how to build this example application. </p> <p>The
example builds an executable called <filepath>LibpThreadExample.exe</filepath> in
the standard locations. </p> <p>To run the example, start <filepath>LibpThreadExample.exe</filepath> 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. </p> </section>
</conbody></concept>