| 词条 | Overlapped I/O |
| 释义 |
Overlapped I/O is a name used for asynchronous I/O in the Windows API. It was introduced as an extension to the API in Windows NT. Utilizing overlapped I/O requires passing an OVERLAPPED structure to API functions that normally block, including ReadFile(), WriteFile(), and Winsock's WSASend() and WSARecv(). The requested operation is initiated by a function call which returns immediately, and is completed by the OS in the background. The caller may optionally specify a Win32 event handle to be raised when the operation completes. Alternatively, a program may receive notification of an event via an I/O completion port, which is the preferred method of receiving notification when used in symmetric multiprocessing environments or when handling I/O on a large number of files or sockets. The so-called overlapped API presents some differences depending on the Windows version used.[1] Asynchronous I/O is particularly useful for sockets and pipes. Unix and Linux implement the POSIX asynchronous I/O API (AIO). References1. ^https://support.microsoft.com/en-gb/help/181611/socket-overlapped-i-o-versus-blocking-nonblocking-mode External links
5 : Concurrency control|Events (computing)|Input/output|Programming constructs|Microsoft application programming interfaces |
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