2706197253qqcom • 2019-09-08 12:37:11

Operating system is a computer program that manages computer hardware and software resources, and is also the core and cornerstone of computer system.The main functions of operating system are to manage and configure memory, determine the priority of system resources supply and demand, control input and output devices, operate network and manage file system. The operating system also provides an interface for users to interact with the system.

Linux

Linux is a set of free-to-use and free-to-spread Unix-like operating system. It is a multi-user, multi-task, multi-threaded and multi-CPU operating system based on POSIX and UNIX. PostVer 0

zhangleilaogeqqcom • 2019-09-09 18:56:49

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<p class="ordinary-output target-output clearfix"><span class="high-light-bg">It is a computer program that manages computer hardware and software resources. It is also the core and cornerstone of computer system.</span></p>
<p class="ordinary-output target-output clearfix">Windows，Linux，DOS and so on.</p>
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1054089618qqcom • 2019-09-11 21:54:54

Operating system is a program to manage computer hardware and software resources.Operating system is the most basic system software that runs directly on the "bare machine". Any other software must be supported by the operating system before it can run.

Windows is the most common computer operating system. It is the operating software developed by Microsoft.The Windows operating system has the characteristics of good man-machine interaction, many supporting applications and strong hardware adaptability. PostVer 0

157128166qqcom • 2019-09-12 10:52:21

Operating system is a program to manage computer hardware and software resources.Operating system is the most basic system software that runs directly on the "bare machine". Any other software must be supported by the operating system before it can run. Windows is the most common computer operating system. It is the operating software developed by Microsoft.The Windows operating system has the characteristics of good man-machine interaction, many supporting applications and strong hardware adaptability. PostVer 0

775385095qqcom • 2019-09-19 10:22:44

An operating system (OS) is the program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface (API). In addition, users can interact directly with the operating system through a user interface such as a command line or a graphical user interface (GUI).

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3372353368qqcom • 2019-10-09 01:30:16

An operating system is a software controlling the operation of a computer system and its resources. Major functions of operating systems may include:

Managing memory and other system resources.Imposing security and access policies.Scheduling and multiplexing processes and threads.Launching and closing user programs, and providing basic system services for them.Providing a basic user interface and application programmer interface.Not all operating systems provide all of these functions. Single-tasking systems like MS-DOS would not schedule processes, while embedded systems like eCOS may not have a user interface.

The opearting system which I fimilar with such as macos、windows、Chrome OS, BlackBerry Tablet OS, and flavors of the open source operating system Linux. PostVer 0

1989812974qqcom • 2019-11-07 12:27:45

1. Process life cycle:

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+ Ready state: The process has acquired all other resources except the cpu, waiting for the CPU to schedule in the ready queue

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+ Execution status: the CPU has been obtained and all required resources are running

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+ Blocking state (waiting state): A process abandons the processor because it waits for the required resources, or the process does not own the processor and other resources are not satisfied.

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2. Necessity of PCB

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PCB is a part of process entity and t PostVer 0

1989812974qqcom • 2019-11-07 12:39:43

An operating system is a software controlling the operation of a computer system and its resources. Major functions of operating systems may include: Managing memory and other system resources.Imposing security and access policies.Scheduling and multiplexing processes and threads.Launching and closing user programs, and providing basic system services for them.Providing a basic user interface and application programmer interface.Not all operating systems provide all of these functions. Single-tasking systems like MS-DOS would not schedule processes, while embedded systems like eCOS may not have a user interface. The opearting system which I fimilar with such as macos、windows、Chrome OS, BlackBerry Tablet OS, and flavors of the open source operating system Linux. PostVer 0

1989812974qqcom • 2019-11-07 12:42:31

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930300924qqcom • 2019-12-13 11:36:51

An operating system is a software controlling the operation of a computer system and its resources. Major functions of operating systems may include: Managing memory and other system resources.Imposing security and access policies.Scheduling and multiplexing processes and threads.Launching and closing user programs, and providing basic system services for them.Providing a basic user interface and application programmer interface.Not all operating systems provide all of these functions. Single-tasking systems like MS-DOS would not schedule processes, while embedded systems like eCOS may not have a user interface. The opearting system which I fimilar with such as macos、windows、Chrome OS, BlackBerry Tablet OS, and flavors of the open source operating system Linux. PostVer 0

1933953631qqcom • 2019-12-18 14:40:21

Operating system is a computer program that manages computer hardware and software resources, and is also the core and cornerstone of computer system.The main functions of operating system are to manage and configure memory, determine the priority of system resources supply and demand, control input and output devices, operate network and manage file system. The operating system also provides an interface for users to interact with the system. LinuX

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