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Boost.Asio provides Windows-specific classes that permit asynchronous wait operations to be performed on HANDLEs to kernel objects of the following types:
For example, to perform asynchronous operations on an event, the following object may be created:
HANDLE handle = ::CreateEvent(...); windows::object_handle file(my_io_context, handle);
The wait()
and async_wait()
member functions may then be used to wait until the kernel object is signalled.
Windows object HANDLE
s
are only available at compile time when targeting Windows. Programs may
test for the macro BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE
to determine whether they are supported.