Search results
Results From The WOW.Com Content Network
A free list (or freelist) is a data structure used in a scheme for dynamic memory allocation. It operates by connecting unallocated regions of memory together in a linked list, using the first word of each unallocated region as a pointer to the next. It is most suitable for allocating from a memory pool, where all objects have the same size.
When the operating system requested memory to load a program, or a program requested more memory to hold data from a file for instance, it would call the memory handling library. This examined the mappings to look for an area in main memory large enough to hold the request. If such a block was found, a new entry was entered into the table.
Memory management (also dynamic memory management, dynamic storage allocation, or dynamic memory allocation) 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.
The Multics operating system is probably the best known system implementing segmented memory. Multics segments are subdivisions of the computer's physical memory of up to 256 pages, each page being 1K 36-bit words in size, resulting in a maximum segment size of 1MiB (with 9-bit bytes, as used in Multics). A process could have up to 4046 segments.
These patterns have implications for locality of reference, parallelism, and the distribution of workload in shared memory systems. memory address The address of a location in a memory or other address space. memory architecture A memory architecture in a computer system, e.g. NUMA, uniform memory access, COMA, etc. memory card
In computer operating systems, memory paging is a memory management scheme that eliminates the need for contiguous memory allocation, [1]. It is often combined with the related technique of allocating and freeing page frames and storing pages on and retrieving them from secondary storage [a] in order to allow the aggregate size of the address spaces to exceed the physical memory of the system. [2]
An allocated memory block is represented with a handle. Get an access pointer to the allocated memory. Free the formerly allocated memory block. The handle can for example be implemented with an unsigned int. The module can interpret the handle internally by dividing it into pool index, memory block index and a version.
The brk and sbrk calls dynamically change the amount of space allocated for the heap segment of the calling process. The change is made by resetting the program break of the process, which determines the maximum space that can be allocated. The program break is the address of the first location beyond the current end of the data region.