I forgot to mention that you'd have to repeat the find operation once you get the write lock since there is a small window between the unlock and lock where another thread may have created the item. On Thu, Aug 18, 2011 at 6:42 AM, Christopher Rienzo <cmrienzo@gmail.com>wrote:
Unlock the read lock and then lock as a write lock.
On Aug 17, 2011 8:20 PM, "Seven Du" <dujinfang@gmail.com> wrote:
Hi,
Just wondering how to upgrade a read lock to a write lock, say I do a find_or_create_item_in_queue()
switch_thread_rwlock_rdlock(lock);
find an item from queue, if not found, create one
switch_thread_rwlock_upgrade_to_wrlock(lock);
write switch_thread_rwlock_unlock(lock);
Thanks -- Seven Du About: http://about.me/dujinfang Blog: http://www.dujinfang.com Proj: http://www.freeswitch.org.cn Sent with Sparrow <http://www.sparrowmailapp.com>
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