Gives an overview about Process, PCB, Process States, Process Operations, Scheduling, Schedulers, Interprocess communication, shared memory and message passing systems
In this presentation, I am explaining about Threads, types of threads, its advantages and disadvantages, difference between Process and Threads, multithreading and its type.
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LinkedIn - https://in.linkedin.com/in/prakharmaurya
Gives an overview about Process, PCB, Process States, Process Operations, Scheduling, Schedulers, Interprocess communication, shared memory and message passing systems
In this presentation, I am explaining about Threads, types of threads, its advantages and disadvantages, difference between Process and Threads, multithreading and its type.
"Like the ppt if you liked the ppt"
LinkedIn - https://in.linkedin.com/in/prakharmaurya
Processes description and process control.Ahsan Rahim
My Fiverr Profile: https://www.fiverr.com/ahsanrahim786
Click to download more Books: http://appsdisaster.blogspot.com/
Process description and process control block in operating system. It includes Process Control Block, Two-states Process model & Five-state process models,
Operating system 24 mutex locks and semaphoresVaibhav Khanna
Mutual Exclusion - If process Pi is executing in its critical section, then no other processes can be executing in their critical sections
2. Progress - If no process is executing in its critical section and there exist some processes that wish to enter their critical section, then the selection of the processes that will enter the critical section next cannot be postponed indefinitely
3. Bounded Waiting - A bound must exist on the number of times that other processes are allowed to enter their critical sections after a process has made a request to enter its critical section and before that request is granted
Assume that each process executes at a nonzero speed
No assumption concerning relative speed of the n processes
Operating system - Process and its conceptsKaran Thakkar
This presentation gives an overview of Process concepts in Operating System. The presentation aims at alleviating most of the overheads while understanding the process concept in operating system. this tailor made presentation will help individuals to understand the overall meaning of process and its underlying concepts used in an operating system.
Swapping is the process of exchanging pages, segment of memory and values to another location and it also manipulates data files that are larger than the main memory. Copy the link given below and paste it in new browser window to get more information on Swapping:- http://www.transtutors.com/homework-help/computer-science/operating-system/memory-management/swapping/
Operating Systems Process Scheduling Algorithmssathish sak
CPU scheduling big area of research in early ‘70s
Many implicit assumptions for CPU scheduling:
One program per user
One thread per program
Programs are independent
These are unrealistic but simplify the problem
Does “fair” mean fairness among users or programs?
If I run one compilation job and you run five, do you get five times as much CPU?
Often times, yes!
Goal: dole out CPU time to optimize some desired parameters of the system.
Operating System
Topic Memory Management
for Btech/Bsc (C.S)/BCA...
Memory management is the functionality of an operating system which handles or manages primary memory. Memory management keeps track of each and every memory location either it is allocated to some process or it is free. It checks how much memory is to be allocated to processes. It decides which process will get memory at what time. It tracks whenever some memory gets freed or unallocated and correspondingly it updates the status.
Processes description and process control.Ahsan Rahim
My Fiverr Profile: https://www.fiverr.com/ahsanrahim786
Click to download more Books: http://appsdisaster.blogspot.com/
Process description and process control block in operating system. It includes Process Control Block, Two-states Process model & Five-state process models,
Operating system 24 mutex locks and semaphoresVaibhav Khanna
Mutual Exclusion - If process Pi is executing in its critical section, then no other processes can be executing in their critical sections
2. Progress - If no process is executing in its critical section and there exist some processes that wish to enter their critical section, then the selection of the processes that will enter the critical section next cannot be postponed indefinitely
3. Bounded Waiting - A bound must exist on the number of times that other processes are allowed to enter their critical sections after a process has made a request to enter its critical section and before that request is granted
Assume that each process executes at a nonzero speed
No assumption concerning relative speed of the n processes
Operating system - Process and its conceptsKaran Thakkar
This presentation gives an overview of Process concepts in Operating System. The presentation aims at alleviating most of the overheads while understanding the process concept in operating system. this tailor made presentation will help individuals to understand the overall meaning of process and its underlying concepts used in an operating system.
Swapping is the process of exchanging pages, segment of memory and values to another location and it also manipulates data files that are larger than the main memory. Copy the link given below and paste it in new browser window to get more information on Swapping:- http://www.transtutors.com/homework-help/computer-science/operating-system/memory-management/swapping/
Operating Systems Process Scheduling Algorithmssathish sak
CPU scheduling big area of research in early ‘70s
Many implicit assumptions for CPU scheduling:
One program per user
One thread per program
Programs are independent
These are unrealistic but simplify the problem
Does “fair” mean fairness among users or programs?
If I run one compilation job and you run five, do you get five times as much CPU?
Often times, yes!
Goal: dole out CPU time to optimize some desired parameters of the system.
Operating System
Topic Memory Management
for Btech/Bsc (C.S)/BCA...
Memory management is the functionality of an operating system which handles or manages primary memory. Memory management keeps track of each and every memory location either it is allocated to some process or it is free. It checks how much memory is to be allocated to processes. It decides which process will get memory at what time. It tracks whenever some memory gets freed or unallocated and correspondingly it updates the status.
Processes are the heartbeat of operating systems, orchestrating the intricate dance of resource allocation, multitasking, and communication that underpins modern computing. At their core, processes represent the execution of a program, encapsulating a virtualized environment in which code can be executed and data manipulated. As we embark on a journey through the labyrinthine landscape of processes within operating systems, we unravel the inner workings of these fundamental entities and explore the myriad roles they play in shaping the computing experience.
At the most fundamental level, a process embodies the execution context of a program, comprising a collection of resources, including memory, CPU time, and input/output (I/O) devices, that are allocated by the operating system to facilitate its execution. Each process is endowed with its own address space, a virtualized memory environment in which it can store code, data, and stack frames, shielded from the prying eyes of other processes through the mechanism of memory isolation. Through the judicious use of process scheduling algorithms, the operating system arbitrates access to CPU time, ensuring that each process receives its fair share of computational resources and preventing monopolization by any single entity.
In addition to managing resource allocation, processes serve as the building blocks of multitasking, enabling the concurrent execution of multiple programs on a single system. Through the mechanism of time-sharing, the operating system interleaves the execution of processes, rapidly switching between them to create the illusion of parallelism, thereby maximizing CPU utilization and enhancing overall system responsiveness. This seamless orchestration of competing demands lies at the heart of modern computing, empowering users to perform complex tasks with efficiency and grace.
Moreover, processes serve as the conduits through which communication occurs within the operating system and between disparate software components. Through mechanisms such as inter-process communication (IPC) and shared memory, processes can exchange data, synchronize their activities, and coordinate their efforts in pursuit of common goals. Whether it be the transmission of messages between cooperating processes or the coordination of input/output operations through device drivers, the ability of processes to collaborate lies at the heart of many advanced computing paradigms, from distributed systems to parallel computing clusters.
Furthermore, processes play a pivotal role in the realm of security, serving as the primary unit of protection and isolation within the operating system. Through the mechanism of process isolation, the operating system enforces strict boundaries between processes, preventing unauthorized access to sensitive data and mitigating the impact of software bugs and malicious code. By confining each process to its own address space and enforcing fine-grained access controls, the opera
Process Concept
Process Scheduling
Operations on Processes
Interprocess Communication
IPC in Shared-Memory Systems
IPC in Message-Passing Systems
Examples of IPC Systems
Communication in Client-Server Systems
Identify the separate components of a process and illustrate how they are represented and scheduled in an operating system.
Describe how processes are created and terminated in an operating system, including developing programs using the appropriate system calls that perform these operations.
Describe and contrast interprocess communication using shared memory and message passing.
Design programs that uses pipes and POSIX shared memory to perform interprocess communication.
Describe client-server communication using sockets and remote procedure calls.
Design kernel modules that interact with the Linux operating system.
UNIT II PROCESS MANAGEMENT
Processes – Process Concept, Process Scheduling, Operations on Processes, Inter-process Communication; CPU Scheduling – Scheduling criteria, Scheduling algorithms, Multiple-processor scheduling, Real time scheduling; Threads- Overview, Multithreading models, Threading issues; Process Synchronization – The critical-section problem, Synchronization hardware, Mutex locks, Semaphores, Classic problems of synchronization, Critical regions, Monitors; Deadlock – System model, Deadlock characterization, Methods for handling deadlocks, Deadlock prevention, Deadlock avoidance, Deadlock detection, Recovery from deadlock.
Senthilkanth,MCA..
The following ppt's full topic covers Operating System for BSc CS, BCA, MSc CS, MCA students..
1.Introduction
2.OS Structures
3.Process
4.Threads
5.CPU Scheduling
6.Process Synchronization
7.Dead Locks
8.Memory Management
9.Virtual Memory
10.File system Interface
11.File system implementation
12.Mass Storage System
13.IO Systems
14.Protection
15.Security
16.Distributed System Structure
17.Distributed File System
18.Distributed Co Ordination
19.Real Time System
20.Multimedia Systems
21.Linux
22.Windows
This presentation is demonstration about database migration example by consuming such services in the cloud, introducing cloudEndure, and success stories.
challenges and difficulties that you may think when you are trying to use cloud services which maybe used in many fields with also customers success stories in consuming such services.
The importance of security topic in the cloud and you should responsible of your data type in the cloud, covering AWS compilance and design, Detecting threats
The presentation is overview about the AWS digital transformation event, with various range of information about AWS services and customers success stories.
Getting to know unity, special thanks to JUST and my friend Ruba Al-Saa'di and Dr. Natheer.
We are waiting for Patented a small request caused a technology revolution.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
Toxic effects of heavy metals : Lead and Arsenicsanjana502982
Heavy metals are naturally occuring metallic chemical elements that have relatively high density, and are toxic at even low concentrations. All toxic metals are termed as heavy metals irrespective of their atomic mass and density, eg. arsenic, lead, mercury, cadmium, thallium, chromium, etc.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
1. 3.1 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Process
An operating system executes a variety of programs:
Batch system – jobs
Time-shared systems – user programs or tasks
Process – a program in execution; process execution must
progress in sequential fashion
A process includes:
program counter
stack
data section
Topics:
Operations in Process
Scheduling
Interprocess Communication
3. 3.3 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Process State
As a process executes, it changes state
new: The process is being created
running: Instructions are being executed
waiting: The process is waiting for some
event to occur
ready: The process is waiting to be assigned
to a processor
terminated: The process has finished
execution
4. 3.4 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Process States and Transition
5. 3.5 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Process Control Block (PCB)
6. 3.6 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Context Switch
When CPU switches to another process, the system must save the
state of the old process and load the saved state for the new
process via a context switch.
Context of a process represented in the PCB
Context-switch time is overhead; the system does no useful work
while switching
Time dependent on hardware support
7. 3.7 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
CPU Switch From Process to Process
8. 3.8 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Process Creation
Parent process create children processes, which, in turn create
other processes, forming a tree of processes
Generally, process identified and managed via a process identifier
(pid)
Options in Resource sharing
Parent and children share all resources
Children share subset of parent’s resources
Parent and child share no resources
Options Execution
Parent and children execute concurrently
Parent waits until children terminate
9. 3.9 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Process Creation (Cont.)
Options n Address space
Child duplicate of parent
Child has a program loaded into it
UNIX examples
fork system call creates new process
exec system call used after a fork to replace the process’ memory
space with a new program
10. 3.10 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Unix Fork/Exec/Exit/Wait Example
int pid = fork();
Create a new process that is a
clone of its parent.
exec*(“program” [, argvp, envp]);
Overlay the calling process
virtual memory with a new
program, and transfer control
to it.
exit(status);
Exit with status, destroying the
process.
int pid = wait*(&status);
Wait for exit (or other status
change) of a child.
fork parent fork child
wait exit
exec
initialize
child
context
11. 3.11 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Example: Process Creation in Unix
int pid;
int status = 0;
if (pid = fork()) {
/* parent */
…..
pid = wait(&status);
} else {
/* child */
…..
exit(status);
}
Parent uses wait to sleep
until the child exits; wait
returns child pid and
status.
Wait variants allow wait
on a specific child, or
notification of stops and
other signals.
The fork syscall
returns twice: it
returns a zero to the
child and the child
process ID (pid) to the
parent.
12. 3.12 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
C Program Forking Separate Process
int main()
{
int pid;
/* fork another process */
pid = fork();
if (pid < 0) { /* error occurred */
fprintf(stderr, "Fork Failed");
exit(-1);
}
else if (pid == 0) { /* child process */
execlp("/bin/ls", "ls", NULL);
}
else { /* parent process */
/* parent will wait for the child to
complete */
wait (NULL);
printf ("Child Complete");
exit(0);
}
}
13. 3.14 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Process Termination
Process executes last statement and asks the operating system to
delete it (exit)
Output data from child to parent (via wait)
Process’ resources are deallocated by operating system
Parent may terminate execution of children processes (abort)
Child has exceeded allocated resources
Task assigned to child is no longer required
If parent is exiting
Some operating system do not allow child to continue if its
parent terminates
– All children terminated - cascading termination
14. 3.15 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Communications Models: Shared
memory or Message Passing
15. 3.16 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Synchronization
Message passing may be either blocking or non-blocking
Blocking is considered synchronous
Blocking send has the sender block until the message is
received
Blocking receive has the receiver block until a message is
available
Non-blocking is considered asynchronous
Non-blocking send has the sender send the message and
continue
Non-blocking receive has the receiver receive a valid
message or null
16. 3.17 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Motivation for multi-threaded servers
17. 3.18 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Single and Multithreaded Processes
18. 3.19 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Benefits
Responsiveness
Resource Sharing
Economy
Scalability
19. 3.20 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Kernel Threads
Recognized and supported by the OS Kernel
OS explicitly performs scheduling and context switching of kernel threads
Examples
Windows XP/2000
Solaris
Linux
Tru64 UNIX
Mac OS X
20. 3.21 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
User Threads
Thread management done by user-level threads library
OS kernel does not know/recognize there are multiple threads running
in a user program.
The user program (library) is responsible for scheduling and context
switching of its threads.
Three primary thread libraries:
POSIX Pthreads
Win32 threads
Java threads
21. 3.22 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
User- vs. Kernel-level Threads
From W. Stallings, Operating Systems, 6th
Edition
22. 3.23 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Pthreads
May be provided either as user-level or kernel-level
A POSIX standard (IEEE 1003.1c) API for thread creation and
synchronization
API specifies behavior of the thread library, implementation is up to
development of the library
Common in UNIX operating systems (Solaris, Linux, Mac OS X)
23. 3.24 Silberschatz, Galvin and GagneOperating System Concepts – 8th
Edition
Java Threads
Java threads are managed by the JVM
Typically implemented using the threads model provided by
underlying OS
Java threads may be created by:
Extending Thread class
Implementing the Runnable interface