Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
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Coding Standards
This is an older version of Boost and was released in 2014. The current version is 1.89.0.
Cancel all operations associated with the signal set.
boost::system::error_code cancel( boost::system::error_code & ec);
This function forces the completion of any pending asynchronous wait
operations against the signal set. The handler for each cancelled operation
will be invoked with the boost::asio::error::operation_aborted
error code.
Cancellation does not alter the set of registered signals.
Set to indicate what error occurred, if any.
If a registered signal occurred before cancel() is called, then the handlers for asynchronous
wait operations will:
These handlers can no longer be cancelled, and therefore are passed an error code that indicates the successful completion of the wait operation.