<p>Unlock the read lock and then lock as a write lock.</p>
<p><blockquote type="cite">On Aug 17, 2011 8:20 PM, "Seven Du" <<a href="mailto:dujinfang@gmail.com">dujinfang@gmail.com</a>> wrote:<br><br><div>
<div>
<span>Hi,<br>
</span></div><div><span><br></span></div><div><span><br></span></div><div><span>Just wondering how to upgrade a read lock to a write lock, say I do a find_or_create_item_in_queue()</span></div><div><span><br>
</span></div><div><span><div><span style="white-space:pre-wrap"> </span>switch_thread_rwlock_rdlock(lock);</div><div><br></div><div><span style="white-space:pre-wrap"> </span>find an item from queue, if not found, create one</div>
<div><br></div><div><div><span style="white-space:pre-wrap"> </span>switch_thread_rwlock_upgrade_to_wrlock(lock);</div></div><div><br></div></span></div><div>
<span><span style="white-space:pre-wrap"> </span></span><span>write</span></div><div><span><span style="white-space:pre-wrap"> </span></span></div><div><span style="white-space:pre-wrap"> </span>switch_thread_rwlock_unlock(lock);</div>
<div><br></div><div><span>Thanks<br><font color="#888888">-- <br>Seven Du<br><div>About: <a href="http://about.me/dujinfang" target="_blank">http://about.me/dujinfang</a></div><div>Blog: <a href="http://www.dujinfang.com" target="_blank">http://www.dujinfang.com</a></div>
<div>Proj: <a href="http://www.freeswitch.org.cn" target="_blank">http://www.freeswitch.org.cn</a></div>Sent with <a href="http://www.sparrowmailapp.com" target="_blank">Sparrow</a><br></font></span></div><div></div><div>
<br></div><div>
</div>
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