munmap

Function Description: MMAP maps a file or other objects to the memory. The file is mapped to multiple pages. If the file size is not the sum of the sizes of all pages, the unused space of the last page will be cleared. Munmap performs the opposite

This article describes the POSIX environment uses file mapping IO method of operation, file mapping IO also known as storage mapping IO , for ordinary files, many times it is efficient, it actually reduces the duplication of data, and it can also be

IPC Three communication mechanism refers to: semaphore, shared memory, message queue, signal Volume: Through the operating system of the PV operation to achieve;Shared Memory: Request a piece of memory, process A to write in shared memory, other

Munmap Munmap (remove memory ing) Related Function MMAP Header file # include # Include Defines the int munmap (void * Start, size_t length) function ); Function Description: munmap () is used to cancel the ing memory start address

Mmap,mmap64,munmap---Map or unmap files or devices into memoryvoid *mmap (void* addr,size_t length, int prot, int flags, int fd, off_t offset);void *mmap64 (void* addr,size_t length, int prot, int flags, int fd, off_t offset);int Munmap (void *addr,

There are a lot of ways to allocate and manage memory commonly used in C + +, such as smart pointers, STL containers, New/delete, Malloc/free, BRK, SBRK, and so on, and recently studied a kind of memory management method of Unix's lower level

MMAP () and munmap ()-Unix system functions are closer to the underlying void* mmap(void* addr,size_t size,int prot,int flags, int fd, off_t offset) The ADDR parameter can specify the first address of the ing. Generally, the

Forwarded by: Http://blog.chinaunix.net/uid-26669729-id-3077015.htmlMmap detailed description of Linux memory managementOne. Mmap system call1. Mmap system callMmap maps a file or other object into memory. Files are mapped to multiple pages, and if

Shared memory is the most useful communication method between processes and the fastest IPC format. The shared memory of two different processes A and B means that the same physical memory is mapped to the process address space of process a and

Note: The android underlying malloc is swapped for mmap to get memory, the acquired memory can be added to the tag, so that the meminfo for analysis, you can view the memory of the tag separately for analysis.One. Mmap system call1. Mmap system

Reprinted from Http://blog.chinaunix.net/uid-26669729-id-3077015.htmlOne. Mmap system call1. Mmap system callMmap maps a file or other object into memory. Files are mapped to multiple pages, and if the size of the file is not the sum of the size of

Shared memory can be said to be the most useful way to communicate between processes and the fastest form of IPC. Two different processes A, B shared memory means that the same physical memory is mapped to process A, B's respective process address

Inter-process communication in Linux (5): Shared Memory (on) One obvious advantage of using shared memory communication is high efficiency, because the process can directly read and write the memory without any data copying. For communication

One. Mmap system call1. Mmap system callMmap maps a file or other object into memory. Files are mapped to multiple pages, and if the size of the file is not the sum of the size of all pages, the space that is not used by the last page will be zeroed

Linux Virtual memory management has several key concepts : How is the Linux virtual address space distributed? How is malloc and free allocating and freeing memory? How can I see the fragmentation of memory inside a heap? Since the heap internal

 Shared Memory-memory ing MMAP Shared memory is the most useful method for inter-process communication and the fastest IPC format. The shared memory of two different processes A and B means that the same physical memory is mapped to the process

Shared Memory Based mapping file#include #include #include #include typedef struct {Char name[4];int age;} people;int main (int argc, char **argv){int FD, I;People *p_map;char temp;FD = open (argv[1], o_creat | O_rdwr | O_trunc, 00777);Lseek (FD,

There are two ways I know about working with Gpio under Linux:1. Writing the driver, of course, familiar with the Linux driver writing methods and techniques, in the driver can use the IOREMAP function to obtain the GPIO physical base address

Cainiao nginx Source Code Analysis Data Structure Article (11) shared memory ngx_shm_t, nginxngx_shm_t Cainiao nginx Source Code Analysis Data Structure Article (11) shared memory ngx_shm_t   Author: Echo Chen (Chen Bin) Email:

Memory Allocation in linux: mmap, munmp, brk, mmapbrk Linux virtual memory management has several key concepts: 1. Each process has an independent virtual address space. The virtual address accessed by the process is not a real physical address; 2.