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A memory-mapped file is a segment of virtual memory [1] that has been assigned a direct byte-for-byte correlation with some portion of a file or file-like resource. This resource is typically a file that is physically present on disk, but can also be a device, shared memory object, or other resource that an operating system can reference through a file descriptor.
In computing, mmap(2) is a POSIX-compliant Unix system call that maps files or devices into memory. It is a method of memory-mapped file I/O. It implements demand paging because file contents are not immediately read from disk and initially use no physical RAM at all.
This subsystem implements only the POSIX.1 standard – also known as IEEE Std 1003.1-1990 or ISO/IEC 9945-1:1990 – primarily covering the kernel and C library programming interfaces which allowed a program written for other POSIX.1-compliant operating systems to be compiled and run under Windows NT. The Windows NT POSIX subsystem did not ...
Windows 8 is a major release of the Windows NT operating system developed by Microsoft.It was released to manufacturing on August 1, 2012, made available for download via MSDN and TechNet on August 15, 2012, [6] and generally released for retail on October 26, 2012.
Windows 8.1 is a release of the Windows NT operating system developed by Microsoft.It was released to manufacturing on August 27, 2013, and broadly released for retail sale on October 17, 2013, about a year after the retail release of its predecessor, and succeeded by Windows 10 on July 29, 2015.
Memory-mapped I/O is preferred in IA-32 and x86-64 based architectures because the instructions that perform port-based I/O are limited to one register: EAX, AX, and AL are the only registers that data can be moved into or out of, and either a byte-sized immediate value in the instruction or a value in register DX determines which port is the source or destination port of the transfer.
Jay-Z made rare comments about his wife Beyoncé and their three children after being accused in a civil lawsuit of raping a 13-year-old girl along with Sean "Diddy" Combs in 2000.. On Sunday, Dec ...
[7] [8] The app was updated with new features in Windows Phone 8.1 where the Maps app took on a Purple paper map-looking logo. [2] [3] Bing Maps at the time was powered by Nokia's data, which later became HERE Maps. [9] Windows Maps on Windows 10 Mobile then changed the layout of the Maps app, including the logo. Since coming out of preview ...