4.4 Multi Threading

The libassuan library is designed so that it can be used in a threaded application, if some rules are followed.

• Run the initialization functions before you actually start to use threads. Specifically, the functions assuan_set_gpg_err_source, assuan_set_malloc_hooks and assuan_set_log_cb should not be called concurrently with assuan_new. Use assuan_new_ext instead or ensure proper serialization.
• Only one thread at a time may access an libassuan context.
• If you use the default log handler, use assuan_set_assuan_log_stream to setup a default log stream.
• If you have callback functions shared by multiple functions, the callback function must be reentrant for that purpose. libassuan does not serialize invocation of callback functions across contexts.