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Memory-mapped file. 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 ...
mmap. 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. The actual reads from disk are performed after a specific location is ...
Memory map. In computer science, a memory map is a structure of data (which usually resides in memory itself) that indicates how memory is laid out. The term "memory map" has different meanings in different contexts. It is the fastest and most flexible cache organization that uses an associative memory. The associative memory stores both the ...
Memory-mapped I/O is preferred in x86-32 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.
Platform. Intel 80386. Type. Expanded memory manager, Command. EMM386 is the expanded memory manager of Microsoft 's MS-DOS, IBM 's PC DOS, Digital Research 's DR-DOS, and Datalight 's ROM-DOS [1] which is used to create expanded memory using extended memory on Intel 80386 CPUs. There also is an EMM386.EXE available in FreeDOS.
Memory management is a form of resource management applied to computer memory. The essential requirement of memory management is to provide ways to dynamically allocate portions of memory to programs at their request, and free it for reuse when no longer needed. This is critical to any advanced computer system where more than a single process ...
SP1 version (16.00.40219) is available as part of Visual Studio 2010 Service Pack 1 or through the Microsoft Visual C++ 2010 Service Pack 1 Compiler Update for the Windows SDK 7.1. [42] Visual C++ 2012 (also known as Visual C++ 11.0) was released on August 15, 2012. It features improved C++11 support, and support for Windows Runtime development ...
Shared memory. In computer science, shared memory is memory that may be simultaneously accessed by multiple programs with an intent to provide communication among them or avoid redundant copies. Shared memory is an efficient means of passing data between programs. Depending on context, programs may run on a single processor or on multiple ...