#define RMRFL_MTCALL 0x02 // set up multi-threaded call support (rmr_init)
#define RMRFL_AUTO_ALLOC 0x03 // send auto allocates a zerocopy buffer
#define RMRFL_NAME_ONLY 0x04 // only the hostname:ip is provided as source information for rts() calls
+#define RMRFL_NOLOCK 0x08 // disable receive ring locking (user app ensures single thread or provides collision protection)
#define RMR_DEF_SIZE 0 // pass as size to have msg allocation use the default msg size