MachOs-by-Doug-Hill-Liza-Hill-Josh-Mickley-Alex
... Concept of the Mach Kernel • Developed by Carnegie Mellon University from ...
... Concept of the Mach Kernel • Developed by Carnegie Mellon University from ...
Operating Systems
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
資工系網媒所NEWS實驗室Chapter 13
... separate module of the operating system, allowing it to be replaced with a different algorithm if necessary. Either SSTF or LOOK is a reasonable choice for the default algorithm. 資工系網媒所 NEWS實驗室 ...
... separate module of the operating system, allowing it to be replaced with a different algorithm if necessary. Either SSTF or LOOK is a reasonable choice for the default algorithm. 資工系網媒所 NEWS實驗室 ...
presentation source
... changes needed to port the system to a new processor is changed in the microkernel - not in the other services ...
... changes needed to port the system to a new processor is changed in the microkernel - not in the other services ...
2.01 - Computer Science at Rutgers
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
Message- passing and RPC Processes Processes vs. Threads
... single sequential execution stream within a process n ...
... single sequential execution stream within a process n ...
Process Concept and State 1 Introduction
... The above two-state model, to some extent, reflects the behaviors of processes; however the real situation is much more complex. We cannot simply deal with all the processes that are not running in the same way. For example, in a time sharing system, a process may lose control of the processor just ...
... The above two-state model, to some extent, reflects the behaviors of processes; however the real situation is much more complex. We cannot simply deal with all the processes that are not running in the same way. For example, in a time sharing system, a process may lose control of the processor just ...
Processes
... separate entity that operates in privileged mode Execution Within User Processes Operating system software within context of a user process Process executes in privileged mode when executing operating system code ...
... separate entity that operates in privileged mode Execution Within User Processes Operating system software within context of a user process Process executes in privileged mode when executing operating system code ...
COS 318: Operating Systems Implementing Threads
... OS doesn’t know the process has multiple threads Timer interrupt (signal facility) can introduce preemption When a user-level thread is blocked on an I/O event, the whole process is blocked Allows user-level code to build custom schedulers Kernel-level threads are scheduled by a kernel scheduler A c ...
... OS doesn’t know the process has multiple threads Timer interrupt (signal facility) can introduce preemption When a user-level thread is blocked on an I/O event, the whole process is blocked Allows user-level code to build custom schedulers Kernel-level threads are scheduled by a kernel scheduler A c ...
Multiprocessor Memory Allocation
... Can improve performance by overlapping activities or performing work in parallel Can enable simpler program design Simplifies distribution ...
... Can improve performance by overlapping activities or performing work in parallel Can enable simpler program design Simplifies distribution ...
Windows Academic Program
... introducing case studies from the Windows kernel into operating system courses ...
... introducing case studies from the Windows kernel into operating system courses ...
Handout13
... Transfers n bytes from the file referenced by filedes to buffer. Transfers n bytes to the file referenced by filedes from buffer. Both operations deliver the number of bytes actually transferred and advance the read-write pointer. ...
... Transfers n bytes from the file referenced by filedes to buffer. Transfers n bytes to the file referenced by filedes from buffer. Both operations deliver the number of bytes actually transferred and advance the read-write pointer. ...
Memory Protection: Kernel and User Address Spaces
... program must be statically linked with all libraries. Dynamic linking is conceptually similar to dynamic loading (except apply to linking) Postpone the linking until execution. How it works: Use a stub to replace the whole library routine Enough information to locate the library routine. ...
... program must be statically linked with all libraries. Dynamic linking is conceptually similar to dynamic loading (except apply to linking) Postpone the linking until execution. How it works: Use a stub to replace the whole library routine Enough information to locate the library routine. ...
1.5 In a multiprogramming and time
... 3.5 What is the purpose of the command interpreter? Why is it usually separate from the kernel? Answer: It reads commands from the user or from a file of commands and executes them, usually by turning them into one or more system calls. It is usually not part of the kernel since the command interpr ...
... 3.5 What is the purpose of the command interpreter? Why is it usually separate from the kernel? Answer: It reads commands from the user or from a file of commands and executes them, usually by turning them into one or more system calls. It is usually not part of the kernel since the command interpr ...
EET-225 Homework #1
... 10. Write a _spawn() family call that calls the program "superpad.exe" and passes it two command line arguments, "value1.txt" and "value2.cfg." Use the correct version of the call (refer to the MSDN documentation). In particular: * The current thread should block while "superpad.exe" is executing. * ...
... 10. Write a _spawn() family call that calls the program "superpad.exe" and passes it two command line arguments, "value1.txt" and "value2.cfg." Use the correct version of the call (refer to the MSDN documentation). In particular: * The current thread should block while "superpad.exe" is executing. * ...
slides
... Operating Systems Concepts with Java, by Silberschatz, Galvin, and Gagne (2003). Many, if not all, of the illustrations contained in this presentation come from this source. ...
... Operating Systems Concepts with Java, by Silberschatz, Galvin, and Gagne (2003). Many, if not all, of the illustrations contained in this presentation come from this source. ...
COS 318: Operating Systems Processes and Threads
... OS code must save state without changing any state E.g. how should OS run without touching any registers? • CISC machines have a special instruction to save and restore all registers on stack • RISC: reserve registers for kernel or have way to carefully save one and then continue ...
... OS code must save state without changing any state E.g. how should OS run without touching any registers? • CISC machines have a special instruction to save and restore all registers on stack • RISC: reserve registers for kernel or have way to carefully save one and then continue ...
Introduction to Object Technology
... needed by the OS to perform its scheduling function: Process state: (e.g., running, ready, waiting/blocked, halted). Priority: scheduling priority of the process. Scheduling-related information: that the scheduling algorithm may need (e.g. the amount of time spent in waiting, the amount of time used ...
... needed by the OS to perform its scheduling function: Process state: (e.g., running, ready, waiting/blocked, halted). Priority: scheduling priority of the process. Scheduling-related information: that the scheduling algorithm may need (e.g. the amount of time spent in waiting, the amount of time used ...
Windows_NT_4
... calls directly as well as calls to the Win32 server. Win32 provides a higher level interface to the Windows NT native API, but with often significant performance implications. The performance hit has supposedly been alleviated largely through the use of messages called Local Procedure Calls. Many ap ...
... calls directly as well as calls to the Win32 server. Win32 provides a higher level interface to the Windows NT native API, but with often significant performance implications. The performance hit has supposedly been alleviated largely through the use of messages called Local Procedure Calls. Many ap ...
Chapter 13 PPT Silberschatz slides (Our Text Book) on I/O systems
... Buffering - store data in memory while transferring between devices To cope with device speed mismatch - de-couples application from device action To cope with device transfer size mismatch To maintain “copy semantics” - guarantee that the version of data written to device from a buffer is i ...
... Buffering - store data in memory while transferring between devices To cope with device speed mismatch - de-couples application from device action To cope with device transfer size mismatch To maintain “copy semantics” - guarantee that the version of data written to device from a buffer is i ...
OS_Intro - SIUE Computer Science
... (3) OS is the government in your computer (the agent that allocate resources) OS provides “resource management” in your computer ...
... (3) OS is the government in your computer (the agent that allocate resources) OS provides “resource management” in your computer ...