This function carries out networked (blocked) activity for outstanding requests which have been prepared by the functions yaz_connect, yaz_search, yaz_present, yaz_scan and yaz_itemorder.
yaz_wait returns when all servers have either completed all requests or aborted (in case of errors).
An associative array of options:
Sets timeout in seconds. If a server has not responded within the timeout it is considered dead and yaz_wait returns. The default value for timeout is 15 seconds.
Returns true on success or false on failure. In event mode, returns resource or false on failure.