CENG334 Introduction to Operating Systems
... issued by the guest OS running in the virtual machine. If so, the hypervisor emulates what the real hardware would do when confronted with that “prvileged instruction” executed in user mode. ...
... issued by the guest OS running in the virtual machine. If so, the hypervisor emulates what the real hardware would do when confronted with that “prvileged instruction” executed in user mode. ...
SCADA Systems, RTOS
... It uses cross-development C/C++ environment Tornado. Provides 256 priority levels. Can work in multiprocessor systems. Uses priority preemptive scheduling. For synchronization uses semaphores, queues, signals. It is used in Spirit and Opportunity being on Mars now. They use radiation-hardened R6000 ...
... It uses cross-development C/C++ environment Tornado. Provides 256 priority levels. Can work in multiprocessor systems. Uses priority preemptive scheduling. For synchronization uses semaphores, queues, signals. It is used in Spirit and Opportunity being on Mars now. They use radiation-hardened R6000 ...
System software - Information Technology
... muliprogrammed computer must be the same as if the program was the only program running on the computer • Programs must not be able to aces other program’s data and must be confident that their data will not be modified by other programs. • Programs must not interfere with other program’s use of I/O ...
... muliprogrammed computer must be the same as if the program was the only program running on the computer • Programs must not be able to aces other program’s data and must be confident that their data will not be modified by other programs. • Programs must not interfere with other program’s use of I/O ...
Linux - Spider
... Bin -- contains the basic system binaries Dev -- all the device entries Etc -- can't think of any other place to put it Home -- where all the users live Lib -- system libraries Mnt -- place to mount filesystems Proc -- system information Root -- the root user's home Sbin -- system binaries Usr -- wh ...
... Bin -- contains the basic system binaries Dev -- all the device entries Etc -- can't think of any other place to put it Home -- where all the users live Lib -- system libraries Mnt -- place to mount filesystems Proc -- system information Root -- the root user's home Sbin -- system binaries Usr -- wh ...
L05_ProcessesAndThreads
... When needed, chooses ready processes to be saved to disk (suspend), or restored from disk (activate) ...
... When needed, chooses ready processes to be saved to disk (suspend), or restored from disk (activate) ...
slides 1
... • Integer ‘S’ that (besides init) can only be modified by: – P(S) or S.wait(): decrement or block if already 0 – V(S) or S.signal(): increment and wake up process if any ...
... • Integer ‘S’ that (besides init) can only be modified by: – P(S) or S.wait(): decrement or block if already 0 – V(S) or S.signal(): increment and wake up process if any ...
A user-mode port of the Linux kernel
... by the tracing thread. It needs to ptrace all new processes, and that is simpli ed if it's their parent. The new thread starts life in a trampoline which does some initialization. It sets up its signal handlers for SIGSEGV, SIGIO, and SIGVTALRM, initializes the timer, and sets itself to be ptraced b ...
... by the tracing thread. It needs to ptrace all new processes, and that is simpli ed if it's their parent. The new thread starts life in a trampoline which does some initialization. It sets up its signal handlers for SIGSEGV, SIGIO, and SIGVTALRM, initializes the timer, and sets itself to be ptraced b ...
FAT:
... operating systems. The FAT file system was created for managing disks in Microsoft Standalone Disk BASIC. In August 1980 Tim Paterson incorporated FAT into his 86DOS operating system for the S-100 8086 CPU boards;[6] the file system was the main difference between 86-DOS and its predecessor, CP/M. T ...
... operating systems. The FAT file system was created for managing disks in Microsoft Standalone Disk BASIC. In August 1980 Tim Paterson incorporated FAT into his 86DOS operating system for the S-100 8086 CPU boards;[6] the file system was the main difference between 86-DOS and its predecessor, CP/M. T ...
Commercial Real-Time Operating Systems
... fully preemptable. VRTXmc is optimized for power consumption and ROM and RAM sizes. It has therefore a very small foot print. The kernel typically requires only 4 to 8 Kbytes of ROM and 1KBytes of RAM. It does not support virtual memory. This version is targeted for cell phones and other small hand- ...
... fully preemptable. VRTXmc is optimized for power consumption and ROM and RAM sizes. It has therefore a very small foot print. The kernel typically requires only 4 to 8 Kbytes of ROM and 1KBytes of RAM. It does not support virtual memory. This version is targeted for cell phones and other small hand- ...
Linux
... • The Built-in System Utilities - are programs that allow a user to perform tasks which involve complex actions. Utilities provide user interface functions that are basic to an operating system, but which are too complex to be built into the shell. Examples of utilities are programs that let us see ...
... • The Built-in System Utilities - are programs that allow a user to perform tasks which involve complex actions. Utilities provide user interface functions that are basic to an operating system, but which are too complex to be built into the shell. Examples of utilities are programs that let us see ...
Dilma M. da Silva IBM TJ Watson Research Center - IC
... Enforcing untampered execution of code Pioneer: Verifying Code Integrity and Enforcing Untampered Code Execution on Legacy Systems (CMU, IBM Research) ...
... Enforcing untampered execution of code Pioneer: Verifying Code Integrity and Enforcing Untampered Code Execution on Legacy Systems (CMU, IBM Research) ...
WSO2006-overview-con..
... Enforcing untampered execution of code Pioneer: Verifying Code Integrity and Enforcing Untampered Code Execution on Legacy Systems (CMU, IBM Research) ...
... Enforcing untampered execution of code Pioneer: Verifying Code Integrity and Enforcing Untampered Code Execution on Legacy Systems (CMU, IBM Research) ...
ppt
... The creation of Pilot which was the first operating system developed for personal computers that would allow for multiple processes to run concurrently where each shared a time slice of CPU. Created using concurrent programming as opposed to event based programming. Add concurrent programming to Mes ...
... The creation of Pilot which was the first operating system developed for personal computers that would allow for multiple processes to run concurrently where each shared a time slice of CPU. Created using concurrent programming as opposed to event based programming. Add concurrent programming to Mes ...
Chapter 2.pdf
... Operating Systems are among the most complex pieces of software ever developed Major advances in development include: ...
... Operating Systems are among the most complex pieces of software ever developed Major advances in development include: ...
lec01
... Approached Bill Gates to see if he can build one Gates approached Seattle computer products, bought 86DOS and created MS-DOS Goal: finish quickly and run existing CP/M software OS becomes subroutine library and command executive ...
... Approached Bill Gates to see if he can build one Gates approached Seattle computer products, bought 86DOS and created MS-DOS Goal: finish quickly and run existing CP/M software OS becomes subroutine library and command executive ...
PPT - Surendar Chandra
... - Introduces a new kernel which outsources policy *and* some mechanisms to applications - Applications are made up of OS libraries (that interact with a non-portable exokernel). OS does not trust OS libraries. Hence, applications can trust the application libraries. ...
... - Introduces a new kernel which outsources policy *and* some mechanisms to applications - Applications are made up of OS libraries (that interact with a non-portable exokernel). OS does not trust OS libraries. Hence, applications can trust the application libraries. ...
Chapter 4 - people.vcu.edu
... • Takes less time to create a new thread than a process • Less time to terminate a thread than a process • Less time to switch between two threads within the same process • Since threads within the same process share memory and files, they can communicate with each other without invoking the kernel ...
... • Takes less time to create a new thread than a process • Less time to terminate a thread than a process • Less time to switch between two threads within the same process • Since threads within the same process share memory and files, they can communicate with each other without invoking the kernel ...
APT 2040: OPERATING SYSTEMS Pre
... provides an understanding of the characteristics and the operating principles of the main hardware components of a computer system. In addition, the course covers the concepts and fundamentals of the operating systems. These fundamentals include process management, memory management, and device mana ...
... provides an understanding of the characteristics and the operating principles of the main hardware components of a computer system. In addition, the course covers the concepts and fundamentals of the operating systems. These fundamentals include process management, memory management, and device mana ...
Linux Scheduling Algorithm
... It receives as input parameters prev (the descriptor pointer of the previously running process) and p (the descriptor pointer of the process to evaluate) The integer value c returned by goodness( ) measures the "goodness" of p and has the following meanings: ...
... It receives as input parameters prev (the descriptor pointer of the previously running process) and p (the descriptor pointer of the process to evaluate) The integer value c returned by goodness( ) measures the "goodness" of p and has the following meanings: ...
A: Process termination requires reclaim of any reusable resources
... programs, etc., to a previous state in the event of system malfunction or failure. The user may create a new restore point manually, roll back to an existing restore point, or change the System Restore configuration. Files and software that are affected by system restore System Restore will undo pro ...
... programs, etc., to a previous state in the event of system malfunction or failure. The user may create a new restore point manually, roll back to an existing restore point, or change the System Restore configuration. Files and software that are affected by system restore System Restore will undo pro ...
AutoPod: Unscheduled System Updates with Zero Data Loss
... isolated namespaces on commodity operating systems, we employ a virtualization architecture that operates between applications and the operating system, without requiring any changes to applications or the operating system kernel. This virtualization layer is used to translate between the AutoPod na ...
... isolated namespaces on commodity operating systems, we employ a virtualization architecture that operates between applications and the operating system, without requiring any changes to applications or the operating system kernel. This virtualization layer is used to translate between the AutoPod na ...
slides
... • A virtual-machine system is a perfect vehicle for operatingsystems research and development. System development is done on the virtual machine, instead of on a physical machine and so does not disrupt normal system operation. • The virtual machine concept is difficult to implement due to the effor ...
... • A virtual-machine system is a perfect vehicle for operatingsystems research and development. System development is done on the virtual machine, instead of on a physical machine and so does not disrupt normal system operation. • The virtual machine concept is difficult to implement due to the effor ...
OPERATING SYSTEMS QUESTIONS
... 10. What is the cause of thrashing? How does the system detect thrashing? Once it detects thrashing, what can the system do to eliminate this problem? - Thrashing is caused by under allocation of the minimum number of pages required by a process, forcing it to continuously page fault. The system can ...
... 10. What is the cause of thrashing? How does the system detect thrashing? Once it detects thrashing, what can the system do to eliminate this problem? - Thrashing is caused by under allocation of the minimum number of pages required by a process, forcing it to continuously page fault. The system can ...
1. Process Concept
... o Fair scheduling: solve the limitations of user threads o Increased Kernel utilization: While one kernel thread is waiting for an I/O completion, the kernel can accept another request. ...
... o Fair scheduling: solve the limitations of user threads o Increased Kernel utilization: While one kernel thread is waiting for an I/O completion, the kernel can accept another request. ...