Input/output completion port

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Input/output completion port (IOCP) is an API for performing multiple simultaneous asynchronous input/output operations in Windows NT versions 3.5 and later,[1] AIX[2] and on Solaris 10 and later.[3] An input/output completion port object is created and associated with a number of sockets or file handles. When I/O services are requested on the object, completion is indicated by a message queued to the I/O completion port. A process requesting I/O services is not notified of completion of the I/O services, but instead checks the I/O completion port's message queue to determine the status of its I/O requests. The I/O completion port manages multiple threads and their concurrency.

See also[edit]


  1. ^ Windows I/O Completion Ports
  2. ^ Configuring IOCP on AIX 5 and 6
  3. ^ "Solaris 10 I/O Completion Ports". Archived from the original on July 19, 2011. Retrieved 2008-07-20.{{cite web}}: CS1 maint: bot: original URL status unknown (link)

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