Starting with 2.4.7, libxml2 makes provisions to ensure that concurrent
threads can safely work in parallel parsing different documents. There is
however a couple of things to do to ensure it:
configure the library accordingly using the --with-threads options
call xmlInitParser() in the "main" thread before using any of the
libxml2 API (except possibly selecting a different memory allocator)
Note that the thread safety cannot be ensured for multiple threads sharing
the same document, the locking must be done at the application level, libxml
exports a basic mutex and reentrant mutexes API in <libxml/threads.h>.
The parts of the library checked for thread safety are:
concurrent loading
file access resolution
catalog access
catalog building
entities lookup/accesses
validation
global variables per-thread override
memory handling
XPath has been tested for threaded usage on non-modified document
for example when using libxslt, but make 100% sure the documents
are accessed read-only !
