How to press a key using its virtual key with SendInput How to prevent Visual Studio from removing all trailing whitespaces? how to print type _TCHAR* How to printf time_t? how to programatically get IP address of local computer how to put int values to char array?? How to put the te...
这个沙盘就是虚拟地址空间(virtual address space),在32位模式下它总是一个4GB的内存地址块。这些虚拟地址通过页表(page table)映射到物理内存,页表由操作系统维护并被处理器引用。每一个进程拥有一套属于它自己的页表,但是还有一个隐情。只要虚拟地址被使能,那么它就会作用于这台机器上运行的所有软件,包括内核本身...
对应memory_order_seq_cst. SC作为默认的内存序,是因为它意味着将程序看做是一个简单的序列。如果对于一个原子变量的操作都是顺序一致的,那么多线程程序的行为就像是这些操作都以一种特定顺序被单线程程序执行。从同的角度来看,一个顺序一致的 store 操作 synchroniezd-with 一个顺序一致的需要读取相同的变量的 lo...
Virtual kernel memory layout: vector : 0xffff0000 - 0xffff1000 ( 4 kB) fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB) DMA : 0xffc00000 - 0xffe00000 ( 2 MB) vmalloc : 0xde800000 - 0xf8000000 ( 408 MB) lowmem : 0xc0000000 - 0xde400000 ( 484 MB) pkmap : 0xbfe00000 - 0xc...
从leveldb中学到了很多东西,但是我觉得最值得学习的还是lsm,虽然它是一种古老的数据结构,但是leveldb让它老树开出了新花,理解它、并且能够自己用代码实现它,可以让自己的编程能力提高一个level,这也契合了leveldb这个名字。 如何肆无忌惮地写文件并且最大限度地保证文件的完整性,leveldb中对于lsm-tree的实现就是最...
Please note that the above figure is just a logical representation of the memory layout. There is no guarantee that on a given system a memory layout of a process would look like this. Also besides these, several other segments for symbol table, debugging information etc exist. ...
munmap() — Unmap pages of memory __must_stay_clean() — Enable or query clean m_wtransform_layout() — Layout transformation for wide-character strings (bidi data) nan(), nanf(), nanl() — Return quiet NaN nand32(), nand64(), nand128() — Return quiet NaN nearbyint(),...
IBM Hiperspace expanded storage Large memory files can be placed in Hiperspace expanded storage to free up some of your home address space for other uses. Hiperspace expanded storage or high performance space is a range of up to 2 GB of contiguous virtual storage space. A program can use ...
If you use the -xalias_level=layout option, the compiler assumes that memory references that involve types with the same sequence of types in memory can alias each other. The compiler assumes that two references with types that do not look the same in memory do not alias each other. The ...
LLVM (Low Level Virtual Machine,底层虚拟机))提供了与编译器相关的支持,能够进行程序语言的编译期优化、链接优化、在线编译优化、代码生成。简而言之,可以作为多种编译器的后台来使用。 苹果公司一直使用 GCC 作为官方的编译器。GCC 作为一款开源的编译器,一直做得不错,但 Apple 对编译工具会提出更高的要求。原因...