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cas
CAS,当oldVal与expected相同时,将oldVal更新为newVal,原子操作ABA problem:when a location is read twice, has the same value for both reads, and "value is same“ is used...
分类:其他好文   时间:2014-05-26 16:06:53    阅读次数:217
Linux 设备驱动程序 proc
不能再简化了#include#include#includeint meng_read_proc(char*page,char**start,off_t offset,int count,int*eof,void*data){ char*s="Hello. This is meng p...
分类:系统相关   时间:2014-05-26 15:52:49    阅读次数:463
php 遍历文件及文件夹
\n"; while($file = $mydir->read()) { if((is_dir("$directory/$file")) AND ($file!=".") AND ($file!="..")) { echo "$fi...
分类:Web程序   时间:2014-05-26 14:22:05    阅读次数:239
HITAG 2 125kHz RFID IC Read-Write 256 bits
Features 256 bits EEPROM memory organized in 8 pages of 32 bits each 32 bits unique factory programmed serial number Typical operating frequency : ...
分类:其他好文   时间:2014-05-26 13:32:43    阅读次数:287
使用iozone测试磁盘性能
IOzone是一个文件系统测试基准工具。可以测试不同的操作系统中文件系统的读写性能。可以通过 write, re-write, read, re-read, random read, random write, random mix, backwards read, record rewirte, ...
分类:其他好文   时间:2014-05-26 13:15:14    阅读次数:298
Sequential Read Ahead For SQL Server
Balancing CPU and I/O throughput is essential to achieve good overall performance and to maximize hardware utilization. SQL Server includes two asynch...
分类:数据库   时间:2014-05-26 12:20:40    阅读次数:386
模拟 + 暴搜 --- Help Me with the Game
Help Me with the GameTime Limit: 1000MSMemory Limit: 65536KTotal Submissions: 3175Accepted: 2053DescriptionYour task is to read a picture of a chessbo...
分类:其他好文   时间:2014-05-26 10:28:59    阅读次数:618
TI C66x DSP硬件信号量 - 3(Direct Semaphore)
Direct request is the simplest method used to request a semaphore. The request behaves as an atomic read and set operation. The result of a request is either to grant the semaphore to the requesting...
分类:其他好文   时间:2014-05-22 17:21:38    阅读次数:517
SQL Server开启READ_COMMITTED_SNAPSHOT
--查询数据库状态select name,user_access,user_access_desc, snapshot_isolation_state,snapshot_isolation_state_desc, is_read_committed_snapshot_onfrom sys.dat.....
分类:数据库   时间:2014-05-22 16:48:03    阅读次数:340
shell的内部命令和外部命令
shell命令分成内置命令和外部命令。 内置命令(builtin command) 是shell解释程序内建的,有shell直接执行,不需要派生新的进程。有一些内部命令可以用来改变当前的shell环境。 常见的内部命令有:.(点命令)、bg、cd、continue、echo、exec、exit、export、fg、jobs、pwd、read、return、set、shift、t...
分类:其他好文   时间:2014-05-21 13:33:24    阅读次数:213
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