SCSI(Small Computer System Interface),小型计算机系统接口,是一种计算机与外部设备之间的接口标准。SCSI的进化型是SAS(Serial Attached SCSI),串行SCSI。 SCSI(Small Computer System Interface),小型计算机系统接口,是一种计算机与外部设备之间的接口标准。SCSI的进化型是SAS(Serial Attached SCSI),串行SCSI。 2)这里所...
2.4.3 Simple I/O via system calls Having an application programmer be aware of the variety and complexity of each I/O device would be intolerable. Thus operating systems provide the programmer with the abstraction of the devices as a piece of memory (Fig. 2.14) that can be read and writte...
一、物理内存划分这里仅实现一个堆的申请和释放。参考os-dev代码。 malloc也就是在heap段中找到可以使用的内存,并返回地址。 /*===mem.h===*/ /* PHYSICAL MEMORY ADDRESS LAYOUT */…
Reinstalling your operating system can be a valuable solution in various situations where your computer's performance or functionality is compromised. Here are four common reasons why you might consider reinstalling your operating system: Performance Degradation: Over time, your computer can accumulate unn...
There are some simple things to check — lots of hard drive defragmentation, for example, will certainly add some unnecessary overhead to disk reads and writes — but what if the cause of your audible problems is something fundamental in the way your PC's operating system is set up? Ha...
Because disabling interrupts does not work on multiple processors, system designers started to invent hardware support for locking. The earliest multiprocessor systems, such as the Burroughts B5000 in the early 1960's, had such support; today all systems provide this type of support, even ...
To accept the simple password, click Done twice. Figure 3-96 Setting the root password 13. Click USER CREATION, create a new user account, set the password, and then click Done. If the password is too simple, the s...
Operating systems can be very simple for minisystems to very sophisticated or complex for large general-purpose systems. The size and complexity of the operating system depend on the type of functions the computer system is to perform. For example, in the operation of large mainframe computers, ...
There are a series of dialog boxes that Windows 2000 will use to collect configuration information for setting up the operating system. Most of the sample screen shots and dialog boxes presented in this subsection are based on a Windows 2000 Advanced Server installation. However, the setup ...
Setting ulimitsUlimits are most commonly modified through global, operating system specific configuration files, using the ulimit command in the shell that launches a process (or its parent process), or at runtime by the process itself (e.g. through setrlimit)....