How to end time-out querying

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Dear all,
here is my question:
Q1--- in this function (mysql_options() ),the desc of MYSQL_OPT_READ_TIMEOUT in the Reference Manual 5.0 is as follows:"The timeout in seconds for attempts to read from the server...".My question is how should I understand this word "read",does it means access the result-set or excute sql or something others?I mean,what on earth does it read?

Q2---About this function mysql_query().If the querying time is too long,how can I stop it to let the programm return normally,Is there any options can set or should i just Interrupt the work thread?If i choosed to terminate the thread ,which way is correct?Can you tell me ?

-----------Thank you for bearing my broken English.Waiting for your reply.
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