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Crossdomain Interview Questions
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Explain Memory Partitioning, Paging, Segmentation?

3165

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Un-Answered Questions

I need help with the following lab. Can anyone explain it to me on how to approach this problem. Coding would be great too !!! No busy waiting allowed. Remember that Java monitors are 'signal and continue'. The input data is called the database (DB). In this problem, it consists of a single variable initialized in the main thread, to contain the current time of day in HH:MM:SS:mmm format (mmm is milliseconds) truncated to 3 digits. Threads follow these rules: 1. Readers may all attempt to read at the same time, but NOT if a writer is writing (i.e.; the writer is in the monitor. 2. Writing is exclusive (only 1 writer at a time, no readers while writing). 3. Options: (to be specified by instructor) a. Readers have absolute priority over writers. b. Writers have absolute priority over readers c. When a reader arrives and a writer is waiting, the reader is suspended behind the writer instead of being admitted immediately. Thus, a writer waits for readers that were running when it arrived, but does not to wait for new readers. You may program this in C++ or Java. There are 4 controlling input values: 1. r – number of readers 2. w – number of writers 3. R – delay for a reader to restart 4. W – delay for a writer to restart Create the following program consisting of 1 main process (your main program) with n threads: 1. The main thread: a. Creates the 'n' threads needed. Of these, r of them are readers and w of them are writers. Starts all readers and writers. b. Waits for all 'n' threads to complete. You may use any method to detect when they are all complete. c. Prints out the resulting outputs from the threads. 2. Threads: a. When a thread starts to run, it immediately tries to enter the monitor. b. A reader thread reads the DB, outputs the exact message below, then exits: >>> DB value read =: HH:MM:SS:mmm by reader number: rr where the underlined text is replaced with actual data. c. A writer thread updates the DB with a new value (from the system time), outputs the exact message below, then exits: *** DB value set to: HH:MM:SS:mmm by writer number: ww where the underlined text is replaced with actual data. d. Each thread accesses the data a total of 10 times, exiting, then re-entering the monitor after each access. Hints: 1. File access *might* not be thread-safe, so you should be prepared to handle this. Read the documentation for the language you are using. 2. Suggested values for delays are: a. If looping, R >=1,000,000 and W>=100,000 b. If using “sleep”, then R=100 ms, W=50 ms. Additional: • Thread output is to ONE file used by ALL threads (so you need to synchronize access to it). • Readers must provide sufficient delay that results are useful (delay by R before re-trying). R is another input value. • Writers must also delay. Delay by W, updating the DB each time. W is an input. • Test your program with AT LEAST TWO different sets of values for r and w (#s of readers and writers) plus this set: r = 4, w=2. Basic operation of a thread: attempt to enter the monitor. If unsuccessful, you get put on a queue. When you get in, read or write the data (depending on type of thread), exit the monitor, wait the required delay amount, then try again. Repeat 10 times.

632


How would you create properties in ActiveX Control?

756


what is the power in horse power of a 4 stroke diesel with the following make up? piston diameter = 250mm length = 70mm stroke = 300 1 bar (1013kpa) rpm = 5/second please show workings

1749


What do you like most about sales?

424


Expand---------PDCB

523






MOP: can MOP is use for Industrial Purpose ? If yes ? what are the uses ? and which industriesw use ? If not use what is the reason? Can it be exported ?

700


IF more than one Site is accessing the same Database server and I want to move the DB with Minimum down time? How will you do

581


what is the difference between ssl and sso

7164


How to convert three phase to single phase in ups

231


what is the difference between Blocked ALV and interactive ALV?

821


how to add a new table with variables and thier values into a imported file uisng proc import?

649


for Precast foundation howmany days required we can shift the foundation with american Standards i need reference with section any body can help

644


hey i have been a customer just for two mnths and i was on ur website i need to know about ur mobile offers?

826


being an electrical engineer why you wanna come into software i have an very good academics what answer i have to give

636


please somebody who have asked questions related to electronic and communication eng siemens 2010-2012 post here

692






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