NAME
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find_call_out - find a call out in the queue
SYNTAX
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int find_call_out(function f);
DESCRIPTION
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This function searches the call out queue, and returns the time left
to this call out will be done in seconds. If no call is found,
zero_type(find_call_out(f)) will return 1.
SEE ALSO
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call_out, remove_call_out and call_out_info