14 on the Symbian platform) program, the use of the LibpThread library |
14 on the Symbian platform) program, the use of the LibpThread library |
15 to demonstrate simple multi-threading and synchronisation. </p> |
15 to demonstrate simple multi-threading and synchronisation. </p> |
16 <p>The purpose is to create a basic multithreading example showing |
16 <p>The purpose is to create a basic multithreading example showing |
17 the usage of the LibpThread APIs. This example also shows how multi-threading |
17 the usage of the LibpThread APIs. This example also shows how multi-threading |
18 is used to achieve concurrency in tasks and sharing of resources. </p> |
18 is used to achieve concurrency in tasks and sharing of resources. </p> |
19 <section id="GUID-026FD8D6-6C4A-5958-B289-775D4AE1E756-GENID-1-10-1-11-1-1-5-1-3-1-11-1-7-1-2-3"><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> |
19 <section id="GUID-026FD8D6-6C4A-5958-B289-775D4AE1E756-GENID-1-10-1-13-1-1-5-1-3-1-11-1-7-1-2-3"><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> |
20 <section id="GUID-7E7C4564-B10E-41F9-8A9D-D8A6C5E9C51C-GENID-1-10-1-11-1-1-5-1-3-1-11-1-7-1-2-4"><title>Description</title> <p>The following sections provide more information about the steps |
20 <section id="GUID-7E7C4564-B10E-41F9-8A9D-D8A6C5E9C51C-GENID-1-10-1-13-1-1-5-1-3-1-11-1-7-1-2-4"><title>Description</title> <p>The following sections provide more information about the steps |
21 that the example performs. </p> <p><b> Thread Synchronisation</b> </p> <p>The example creates three threads named ThreadOne, |
21 that the example performs. </p> <p><b> Thread Synchronisation</b> </p> <p>The example creates three threads named ThreadOne, ThreadTwo |
22 ThreadTwo and ThreadThree. The threads write "One", "Two" and "Three" |
22 and ThreadThree. The threads write "One", "Two" and "Three" five times |
23 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 |
23 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 |
24 used to ensure that first ThreadOne writes in the file, then ThreadTwo |
24 used to ensure that first ThreadOne writes in the file, then ThreadTwo |
25 and then ThreadThree. If the mutex is not used all the threads can |
25 and then ThreadThree. If the mutex is not used all the threads can |
26 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> |
26 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> |
27 <section id="GUID-236CB272-E196-4A61-B627-ACFFC4B37AA1"><title>Related |
27 <section id="GUID-236CB272-E196-4A61-B627-ACFFC4B37AA1"><title>Related |
28 APIs</title><p><xref href="GUID-94FEEC14-384E-364F-929F-0339FE559FB0.dita"><apiname>pthread_mutex_lock(pthread_mutex_t *)</apiname></xref> </p><p><xref href="GUID-E0AABD52-5A8F-3F49-A46D-5CE5BE975765.dita"><apiname>pthread_mutex_unlock(pthread_mutex_t *)</apiname></xref> </p><p><xref href="GUID-23868643-4C61-3661-843B-2D67C54CF163.dita"><apiname>pthread_join(pthread_t,void **)</apiname></xref></p><p><xref href="GUID-889CB456-6980-3B92-9350-0C6C8C9AC435.dita"><apiname>pthread_mutex_t</apiname></xref></p></section> |
28 APIs</title><p><xref href="GUID-94FEEC14-384E-364F-929F-0339FE559FB0.dita"><apiname>pthread_mutex_lock(pthread_mutex_t *)</apiname></xref> </p><p><xref href="GUID-E0AABD52-5A8F-3F49-A46D-5CE5BE975765.dita"><apiname>pthread_mutex_unlock(pthread_mutex_t *)</apiname></xref> </p><p><xref href="GUID-23868643-4C61-3661-843B-2D67C54CF163.dita"><apiname>pthread_join(pthread_t,void **)</apiname></xref></p><p><xref href="GUID-889CB456-6980-3B92-9350-0C6C8C9AC435.dita"><apiname>pthread_mutex_t</apiname></xref></p></section> |
29 <section id="GUID-67A72761-1D92-46D1-B1C9-7455978BDE4E-GENID-1-10-1-11-1-1-5-1-3-1-11-1-7-1-2-6"><title>Build</title> <p>The <xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">Symbian |
29 <section id="GUID-67A72761-1D92-46D1-B1C9-7455978BDE4E-GENID-1-10-1-13-1-1-5-1-3-1-11-1-7-1-2-6"><title>Build</title> <p>The Symbian build process describes how to build this example |
30 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 |
30 application. </p> <p>The example builds an executable |
31 IDE. After launching the executable, depending on the emulator you |
31 called <filepath>LibpThreadExample.exe</filepath> in the standard |
32 are using, you may need to navigate away from the application launcher |
32 locations. </p> <p>To run the example, start <filepath>LibpThreadExample.exe</filepath> from the file system or from your IDE. After launching the executable, |
33 or shell screen to view the console. </p> </section> |
33 depending on the emulator you are using, you may need to navigate |
|
34 away from the application launcher or shell screen to view the console. </p> </section> |
34 </conbody></concept> |
35 </conbody></concept> |