Bojan Smojver wrote:
On Fri, 2009-10-30 at 10:26 +0100, Stefan Ruppert wrote:
first of all the question is if the apr_file_t handle can be safely
used from different threads? e.g. is APR file wrapper thread safe? And
I don't think so!
It isn't safe. Not even with APR_FOPEN_XTHREAD.
This whole thing is related to this:
http://www.mail-archive.com/[email protected]/msg46051.html
I don't know the concept behind APR_FOPEN_XTHREAD, but after a quick
look into the trunk source code this seems to only protect the buffered
io but not the file structure itself.
From my point of view if an application needs to handle a file within
different threads it has to protect its multi-threaded usage with an own
lock!
However, if you want to be sure use valgrind/helgrind to detect any
threading race conditions. I have found a race condition with helgrind
in apr_pools.c! See my post from august. This tool is incredible!
Stefan
