Re: [libvirt] [PATCH] rpc: ensure thread safe initialization of SASL library

Neither the sasl_client_init or sasl_server_init methods are even remotely threadsafe. They do a bunch of one-time initialization and merely use a simple integer counter to avoid repeated work, not even using atomic increment/reads on the counter. This can easily race in a threaded program. Protect the calls using a virOnce initializer function which is guaranteed threadsafe at least from libvirt's POV. If the application using libvirt also uses another library that makes use of SASL then the race still exists. It is impossible to fix that fully except in SASL code itself. Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/rpc/virnetsaslcontext.c | 50 ++++++++++++++++++++++++------------- 1 file changed, 33 insertions(+), 17 deletions(-)