Object HANDLEs

Object HANDLEs

Asio provides Windows-specific classes that permit asynchronous wait operations to be performed on HANDLEs to kernel objects of the following types:

Change notification
Console input
Event
Memory resource notification
Process
Semaphore
Thread
Waitable timer

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.

See Also

windows::object_handle.

Notes

Windows object HANDLEs are only available at compile time when targeting Windows. Programs may test for the macro ASIO_HAS_WINDOWS_OBJECT_HANDLE to determine whether they are supported.