Operating Systems
... • e.g. Windows NT was originally microkernel (3.5), but now (4.0 onwards) pushed lots back into kernel for performance. • Still not clear what the best OS structure is, or how much it really matters. . . ...
... • e.g. Windows NT was originally microkernel (3.5), but now (4.0 onwards) pushed lots back into kernel for performance. • Still not clear what the best OS structure is, or how much it really matters. . . ...
Module 7: Process Synchronization
... Algorithm for Process Pi do { flag[i] = TRUE; turn = j; while (flag[j] && turn == j); critical section flag[i] = FALSE; remainder section } while (TRUE); ...
... Algorithm for Process Pi do { flag[i] = TRUE; turn = j; while (flag[j] && turn == j); critical section flag[i] = FALSE; remainder section } while (TRUE); ...
ch1
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
What is an Operating System?
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
What is an Operating System?
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
... One or more CPUs, device controllers connect through common bus providing access to shared memory ...
M.C.A.(Sem - V) Distributed Computing
... 1. How does the system find an idle workstation? 2. How is a process transferred from one workstation to get it executed on another workstation? 3. What happens to a remote process if a user logs onto a workstation that was idle until now and was being used to execute a process of another workstatio ...
... 1. How does the system find an idle workstation? 2. How is a process transferred from one workstation to get it executed on another workstation? 3. What happens to a remote process if a user logs onto a workstation that was idle until now and was being used to execute a process of another workstatio ...
Slide 1
... 041500 Time Machine is synchronization software used for backup on Macs. 041600 To repopulate a new hard disk from an incremental backup, you have to first restore a full backup. 041700 A boot disk contains a complete copy of your computer’s hard disk as it existed when the computer was new. C ...
... 041500 Time Machine is synchronization software used for backup on Macs. 041600 To repopulate a new hard disk from an incremental backup, you have to first restore a full backup. 041700 A boot disk contains a complete copy of your computer’s hard disk as it existed when the computer was new. C ...
Chapter 13: I/O Systems
... OS can recover from disk read, device unavailable, transient write failures Most return an error number or code when I/O request fails System error logs hold problem reports ...
... OS can recover from disk read, device unavailable, transient write failures Most return an error number or code when I/O request fails System error logs hold problem reports ...
Chapter 13: I/O Systems
... User process may accidentally or purposefully attempt to disrupt normal ...
... User process may accidentally or purposefully attempt to disrupt normal ...
Chapter 2: System Structures
... File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
... File-system manipulation - The file system is of particular interest. Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management. ...
Lecture-4
... At Q1 the job receives 16 additional milliseconds. If it still does not complete, it is preempted and moved to queue Q2. ...
... At Q1 the job receives 16 additional milliseconds. If it still does not complete, it is preempted and moved to queue Q2. ...
I/O Systems
... “dirty” blocks Some use object-oriented methods and message passing to implement I/O ...
... “dirty” blocks Some use object-oriented methods and message passing to implement I/O ...
Computer Security - Florida State University
... directory list directory contents create or rename a file in a directory search the directory ...
... directory list directory contents create or rename a file in a directory search the directory ...
2.01 - Tamkang University
... 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. ...
Figure 5.01 - College of the Holy Cross
... that can be run with separate threads of control. A Word processor may have separate threads for: User input Spell check grammar check displaying graphics document layout A web server may spawn a thread for each client Can serve clients concurrently with multiple threads. It takes ...
... that can be run with separate threads of control. A Word processor may have separate threads for: User input Spell check grammar check displaying graphics document layout A web server may spawn a thread for each client Can serve clients concurrently with multiple threads. It takes ...
ch13
... - stream head interfaces with the user process - driver end interfaces with the device - zero or more stream modules between them ...
... - stream head interfaces with the user process - driver end interfaces with the device - zero or more stream modules between them ...
Processes - EECG Toronto
... • What happens if you run “exec csh” in your shell? • What happens if you run “exec ls” in your shell? Try it. • fork() can return an error. Why might this happen? • Cannot create child process (return to parent). ...
... • What happens if you run “exec csh” in your shell? • What happens if you run “exec ls” in your shell? Try it. • fork() can return an error. Why might this happen? • Cannot create child process (return to parent). ...
Lecture4
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
... Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ...
Course Introduction
... sharing: how are resources shared across users? naming: how are resources named (by users or programs)? security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happen ...
... sharing: how are resources shared across users? naming: how are resources named (by users or programs)? security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happen ...
Linus Torvalds - cs.helsinki.fi
... it’s even usable (though may not be depending on what you want), and I am willing to put out the sources for wider distribution. It is just version 0.02 (+1 (very small) patch already), but I’ve successfully run bash/GCC/gnumake/gnu-sed/compress etc under it. Sources for this pet project of mine can ...
... it’s even usable (though may not be depending on what you want), and I am willing to put out the sources for wider distribution. It is just version 0.02 (+1 (very small) patch already), but I’ve successfully run bash/GCC/gnumake/gnu-sed/compress etc under it. Sources for this pet project of mine can ...
Real-time Operating Systems - Institute of Computer Engineering
... Tasks are executed inside kernel memory space, which prevents threads to be swapped-out and also the number of TLB misses is reduced. Threads are executed in processor supervisor mode (i.e. ring level 0 in i386 arch), have full access to the underlying hardware. Since the RTOS and the applicat ...
... Tasks are executed inside kernel memory space, which prevents threads to be swapped-out and also the number of TLB misses is reduced. Threads are executed in processor supervisor mode (i.e. ring level 0 in i386 arch), have full access to the underlying hardware. Since the RTOS and the applicat ...
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[slides] I/O systems
... Explore the structure of an operating system’s I/O subsystem Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware and ...
... Explore the structure of an operating system’s I/O subsystem Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware and ...