memory map mmap
Memory-mapped file objects behave like both strings and like file objects. Unlike normal string objects, however, these are mutable. You can use mmap objects in most places where strings are expected; for example, you can use the re module to search throu,Memory-mapped file objects behave like both bytearray and like file objects. You can use mmap objects in most places where bytearray are expected; for example, you can use the re module to search through a memory-mapped file. You can also change a single ,void *start. What exactly this is the start of? Is it the start of memory map for my device? It's the logical address within your program where you want the mapping to occur. If you give it NULL, it will assign one [recommmended]. This is a "hint, Here's an excerpt from The GNU C Library: Memory-mapped I/O. Since mmapped pages can be stored back to their file when physical memory is low, it is possible to mmap files orders of magnitude larger than both the physical memory and swap space. The o,A memory-mapped file is a segment of virtual memory 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,13.8 Memory-mapped I/O. On modern operating systems, it is possible to mmap (pronounced “em-map”) a file to a region of memory. When this is done, the file can be accessed just like an array in the program. This is more efficient than read or write , as o,跳到 Memory visibility - The main difference between System V shared memory (shmem) and memory mapped I/O (mmap) is that SystemV shared memory is persistent: unless explicitly removed by a process, it is kept in memory and remains available until the syste,The mmap() function establishes a mapping between a process' address space and a stream file. The address space of the process from the address returned to the caller, for a length of len, is mapped onto a stream file starting at offset off. The porti,If the memory region specified by addr and len overlaps pages of any existing mapping(s), then the overlapped part of the existing mapping(s) will be discarded. If the specified address cannot be used, mmap() will fail. Software that aspires to be portabl,小談mmap() 與VMA. jollen 發表於March 16, 2007 5:38 PM. 最近在program loader 專欄裡，整理並分享了kernel 的ELF loader 主題；接著下來就是dynamic linking 的議題了。在正式介紹dynamic linking 前，先來簡單提一下「memory mapping」的觀念；近期在進行Linux programming 的教育訓練，正好可以跟同學做個小討論。
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 memory map mmap 相關參考資料
16.7. mmap — Memory-mapped file support — Python 2.7.15 ...
Memory-mapped file objects behave like both strings and like file objects. Unlike normal string objects, however, these are mutable. You can use mmap objects in most places where strings are expected;... https://docs.python.org 18.9. mmap — Memory-mapped file support — Python 3.6.5 ...
Memory-mapped file objects behave like both bytearray and like file objects. You can use mmap objects in most places where bytearray are expected; for example, you can use the re module to search thro... https://docs.python.org c - mmap a device and access it device's memory map - Stack Overflow
void *start. What exactly this is the start of? Is it the start of memory map for my device? It's the logical address within your program where you want the mapping to occur. If you give it NULL, ... https://stackoverflow.com CC++ - Memory map file using mmap - Stack Overflow
Here's an excerpt from The GNU C Library: Memory-mapped I/O. Since mmapped pages can be stored back to their file when physical memory is low, it is possible to mmap files orders of magnitude lar... https://stackoverflow.com Memory-mapped file - Wikipedia
A memory-mapped file is a segment of virtual memory 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 ... https://en.wikipedia.org Memory-mapped IO (The GNU C Library) - GNU.org
13.8 Memory-mapped I/O. On modern operating systems, it is possible to mmap (pronounced “em-map”) a file to a region of memory. When this is done, the file can be accessed just like an array in the pr... http://www.gnu.org mmap - Wikipedia
跳到 Memory visibility - The main difference between System V shared memory (shmem) and memory mapped I/O (mmap) is that SystemV shared memory is persistent: unless explicitly removed by a process, it ... https://en.wikipedia.org mmap()--Memory Map a File - IBM
The mmap() function establishes a mapping between a process' address space and a stream file. The address space of the process from the address returned to the caller, for a length of len, is mapp... https://www.ibm.com mmap(2) - Linux manual page - man7.org
If the memory region specified by addr and len overlaps pages of any existing mapping(s), then the overlapped part of the existing mapping(s) will be discarded. If the specified address cannot be used... http://man7.org 小談mmap() 與VMA - jollen
小談mmap() 與VMA. jollen 發表於March 16, 2007 5:38 PM. 最近在program loader 專欄裡，整理並分享了kernel 的ELF loader 主題；接著下來就是dynamic linking 的議題了。在正式介紹dynamic linking 前，先來簡單提一下「memory mapping」的觀念；近期在進行Linux programming 的... http://www.jollen.org |