Am 21.10.2013 16:22, schrieb Jeff Trawick:
On Mon, Oct 21, 2013 at 8:57 AM, <email@example.com
Date: Mon Oct 21 12:57:05 2013
New Revision: 1534139
Merge r960671 from trunk:
Only deal with the mutex when XTHREAD is enabled. This increases the
performance of buffered reads/writes tremendously.
(apr_file_read, apr_file_write): only manipulate mutex when XTHREAD
Submitted by: Ivan Zhakov <ivan visualsvn.com <http://visualsvn.com>>
Trunk continues to allocate a mutex if buffered, even if the XTHREAD
flag is on (a minor detail I suppose). That presumably is a simple fix
after double checking all the references to mutex or buffered in the
code used on Windows. ISTR other concerns about the mutex or XTHREAD,
but I think this is an orthogonal issue.
Regarding exclusive access to a file under windows I filed a bug in 2010: https://issues.apache.org/bugzilla/show_bug.cgi?id=50058
Using the apr_file_lock()/apr_file_unlock() under Windows in append mode will deadlock the current thread! In the time of 2010 I just removed the apr_file_lock()/apr_file_unlock() code within the readwrite.c module. But a better solution is to support nesting within apr_file_lock()/apr_file_unlock() API calls!