Lecture17
... structure. Each cache filled with objects – instantiations of the data structures. When cache created, filled with objects marked as free When structures stored, objects marked as used If slab is full next object allocated from empty slab if no empty slabs, new slab allocated ...
... structure. Each cache filled with objects – instantiations of the data structures. When cache created, filled with objects marked as free When structures stored, objects marked as used If slab is full next object allocated from empty slab if no empty slabs, new slab allocated ...
Slides - CSE
... – The set of labels are defined by trusted administrators – The set of labels are immutable – Protection state, labeling state, and transition state can only be modified by trusted administrators through trusted programs ...
... – The set of labels are defined by trusted administrators – The set of labels are immutable – Protection state, labeling state, and transition state can only be modified by trusted administrators through trusted programs ...
ppt - Dave Reed`s
... job corruption handled by modes (user vs. monitor), I/O limited to monitor mode monitor corruption handled using memory protection infinite loops handled by job execution timer ...
... job corruption handled by modes (user vs. monitor), I/O limited to monitor mode monitor corruption handled using memory protection infinite loops handled by job execution timer ...
CPU Scheduling Algorithms
... • What does the Superbowl have to do with scheduling?! – Also, want to watch Law & Order, Desperate House wives, etc – But, have to finish Project and Homework! – What criteria to use to schedule events? ...
... • What does the Superbowl have to do with scheduling?! – Also, want to watch Law & Order, Desperate House wives, etc – But, have to finish Project and Homework! – What criteria to use to schedule events? ...
ppt - Dave Reed
... job corruption handled by modes (user vs. monitor), I/O limited to monitor mode monitor corruption handled using memory protection infinite loops handled by job execution timer ...
... job corruption handled by modes (user vs. monitor), I/O limited to monitor mode monitor corruption handled using memory protection infinite loops handled by job execution timer ...
theGuard! ApplicationManager System Windows Data
... events according to pre-defined rules. They deliver every performance value and the current status of each application object in real time. They also provide insight into configuration attributes, such as the release status or the application's parameter settings. Data collectors model an applicatio ...
... events according to pre-defined rules. They deliver every performance value and the current status of each application object in real time. They also provide insight into configuration attributes, such as the release status or the application's parameter settings. Data collectors model an applicatio ...
Chapter 2
... Access to shared memory or shared variables must be controlled if the memory or variables are changed Can add complexity, bugs to program code E.g., need to be very careful to avoid race conditions, deadlocks and other problems ...
... Access to shared memory or shared variables must be controlled if the memory or variables are changed Can add complexity, bugs to program code E.g., need to be very careful to avoid race conditions, deadlocks and other problems ...
File
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
What is an Operating System?
... System call – request to the operating system to allow user to wait for I/O completion Device-status table contains entry for each I/O device indicating its type, address, and state Operating system indexes into I/O device table to determine device status and to modify table entry to include i ...
... System call – request to the operating system to allow user to wait for I/O completion Device-status table contains entry for each I/O device indicating its type, address, and state Operating system indexes into I/O device table to determine device status and to modify table entry to include i ...
The 27 Year Old Microkernel - foundry27
... Mostly used when manipulation of kernel structures is required Provide atomicity of kernel state modifications to ensure consistency > Occasionally used when processor privilege is required Ex: manipulate privileged CPU registers > Arguments are a function pointer and a data pointer Remember ...
... Mostly used when manipulation of kernel structures is required Provide atomicity of kernel state modifications to ensure consistency > Occasionally used when processor privilege is required Ex: manipulate privileged CPU registers > Arguments are a function pointer and a data pointer Remember ...
OSCE Chapter 1. - UCSB Computer Science
... Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file Privilege escalation allows user to change to effective ID with ...
... Group identifier (group ID) allows set of users to be defined and controls managed, then also associated with each process, file Privilege escalation allows user to change to effective ID with ...
15 - Portland State University
... Maintain time of day Must update the time-of-day every tick Prevent processes from running too long Account for CPU usage Separate timer for every process Charge each tick to the current process Handling the “Alarm” syscall User programs ask to be sent a signal at a given time Providing watc ...
... Maintain time of day Must update the time-of-day every tick Prevent processes from running too long Account for CPU usage Separate timer for every process Charge each tick to the current process Handling the “Alarm” syscall User programs ask to be sent a signal at a given time Providing watc ...
Signals, Semaphores and Deadlock
... 2. No preemption – once a resource has been allocated to a process, that resource cannot be preempted by another process. Processes hold on to the resources they have been allocated until they release them voluntarily. 3. Processes can request additional resources at any time request additional reso ...
... 2. No preemption – once a resource has been allocated to a process, that resource cannot be preempted by another process. Processes hold on to the resources they have been allocated until they release them voluntarily. 3. Processes can request additional resources at any time request additional reso ...
Operating Systems 2230 Lecture 8: Complexity of I/O Devices
... We could consider the random arrival order as the worst-case access pattern, giving the worst possible performance. The simplest disk scheduling strategy is the obvious first-in-first-out (FIFO), in which all requests are serviced in order. It is a fair strategy as all requests are eventually satisf ...
... We could consider the random arrival order as the worst-case access pattern, giving the worst possible performance. The simplest disk scheduling strategy is the obvious first-in-first-out (FIFO), in which all requests are serviced in order. It is a fair strategy as all requests are eventually satisf ...
SC PE
... combinative efforts from those three. • We will see three major functions/activities of a computer system – Program execution ...
... combinative efforts from those three. • We will see three major functions/activities of a computer system – Program execution ...
Basics of Operating Systems
... on successful completion of the course student is supposed to: define the basic structure of the operating system, describe the basic functions and features of operating systems, identify one-purpose and multi-tasking systems, as well as single-threaded and multithreaded, will be able to define conc ...
... on successful completion of the course student is supposed to: define the basic structure of the operating system, describe the basic functions and features of operating systems, identify one-purpose and multi-tasking systems, as well as single-threaded and multithreaded, will be able to define conc ...
Operating Systems
... A multiprocessing OS supports two or more processors running programs at the same time. ...
... A multiprocessing OS supports two or more processors running programs at the same time. ...
Operating Systems
... A multiprocessing OS supports two or more processors running programs at the same time. ...
... A multiprocessing OS supports two or more processors running programs at the same time. ...
Operating Systems
... the course home page. Material can be downloaded from course website! • Continued and regular use of e-mail is expected • Students must keep copies of all assignments and projects sent by e-mail. ...
... the course home page. Material can be downloaded from course website! • Continued and regular use of e-mail is expected • Students must keep copies of all assignments and projects sent by e-mail. ...
Computing Systems Division
... computer (everything done via submission of jobs to operator who actually used the computer) Reduce setup time by loading jobs together that have similar requirements e.g. all jobs that need compiler ...
... computer (everything done via submission of jobs to operator who actually used the computer) Reduce setup time by loading jobs together that have similar requirements e.g. all jobs that need compiler ...
PDF
... • Early version of the ethernet interface was presented as a kind of block device (seek disabled) • But many devices used IOCTL operations heavily ...
... • Early version of the ethernet interface was presented as a kind of block device (seek disabled) • But many devices used IOCTL operations heavily ...
slides.01.pdf
... construct a representant for that program during its execution ⇒ process. A process is an invention by an operating system: it is used as a placeholder for executing programs so that we can keep a precise account of how program execution is affecting the use of hardware and software resources. ...
... construct a representant for that program during its execution ⇒ process. A process is an invention by an operating system: it is used as a placeholder for executing programs so that we can keep a precise account of how program execution is affecting the use of hardware and software resources. ...
introduction - Eastern Mediterranean University
... Computer System Organization Computer-system operation One or more CPUs, device controllers connect through common bus providing access to shared memory Concurrent execution of CPUs and devices competing for memory cycles ...
... Computer System Organization Computer-system operation One or more CPUs, device controllers connect through common bus providing access to shared memory Concurrent execution of CPUs and devices competing for memory cycles ...