reader and writer problem

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The writer's priority algorithm for reader-writer problem

Transfer from reader-writer problem is a classic process synchronization problem that is implemented with semaphores. In the system, a data set (such as a file or record) is shared by several concurrent processes, which are divided into two categories, one o

Linux Multithreading Practice (6)--posix read-write lock solves reader writer's problem

scheduling class that does not allow preemption.reader Writer's questionProblem description A data object can be shared by multiple concurrent processes. Some of these processes may only need to read the contents of the shared object, while other processes may want to update the contents of the shared object. Reader: Only interested in the process of reading; written by: Other processes (write only, or read and write); Rules allows multiple rea

Windows operating system intern reader-Writer Problem

Internship environment: Windows XP + VC 6.0 Internship objectives: Create a console process in Windows XP, which should contain n threads. Use the n threads to represent n readers or writers. Each thread performs read/write operations according to the requirements of the corresponding test data file (described later. The semaphore mechanism is used to implement reader-first and writer-first issues respectiv

Multi-Threaded reader Writer's problem--using QT to realize

: voidRead () {Printmutex.Lock(); cout"Reader read out:"Endl; Printmutex.unlock (); }protected: voidrun () {Queuemutex.Lock(); Rdcnmutex.Lock(); if(Readercount = =0) {Bmutex.Lock(); } Readercount++; Rdcnmutex.unlock (); Queuemutex.unlock (); Sleep (1); Read (); Rdcnmutex.Lock(); Readercount--; if(Readercount = =0) {bmutex.unlock (); } rdcnmutex.unlock (); }};intReader::readercount =0; Qmutex

-java realization of reader-writer problem

Reader-writer problem (Readers-writers problem) is also a classic concurrent programming problem, which is often a synchronization problem. Data (Files, records) in a computer system are often shared by multiple processes, but som

Analysis of P and V operation examples-reader-Writer Problem-sleep barber Problem

Question 1: readers Level 1: Only readers are allowed. A maximum of K readers are allowed to write programs using P and V Operations. int main(){ int rspace = k; cobegin read_1(); read_2(); …… read_n(); coend}read_i(){ p(rspace); …… v(rspace);} In this operation, you need to set the signal rspace to determine whether the number of people has reached K. When the number of people reaches K, rspace = 0. In this case, you need to suspend. Level 2: One

Second-kill multithreading the 14th reader-writer problem following read-write lock Srwlock (cont.)

blockE.printstacktrace (); }} mlatchdown.countdown (); } } Public classWriter extends Thread { PublicString name =NULL; Boolean flag=true; Private intindex =0; Private intCash =0; PublicWriter (String name,intAddcash) { This. Name =name; This. Cash =Addcash; } @Override Public voidrun () {System. out. println ("[Writer]"+ name +"Start"); while(flag) {Try{Mreadwritelock.writelock ().Lock(); System. out. println ("[

Reader writer problem of multi-thread synchronization

Problem definition:Existing piece of shared memory, multiple read processes, and multiple write processes. Multiple read processes can be read at the same time, but no other read or write processes are executed when there is a write process in progress.There are 3 variants of the problem. The first is called "Reader First" (readers-preference). In this case, as l

William Stallings "operating system kernel and design principles" in the book Linux C language to achieve the reader problem (writer first) code __linux

Code can run, but it is really not observed what the reader first, or write a priority. It is not known where this priority conflict is coming from, and it does not know what the book says. Especially in the writer of the following code, if Sem_wait (z) is introduced, the writer process blocks, causing the reader to bl

Simple implementation of reader Writer's problem with Java thread secure queue.

Common operating system textbooks use mutexes to synchronize the reader thread with the writer thread, but after JDK5 introduces the thread-safe queue, the problem becomes surprisingly simple. Java.util.concurrent.ConcurrentLinkedQueue is a thread-safe non-blocking queue, it is very easy to think that the non-blocking queue when the thread needs to wait, it will

Reader Writer Problem C thread implementation Linux platform

1. First, the reader's semaphore implementation Set three mutex semaphores: Rwmutex is used to access Shared data that is mutually exclusive to other readers/writers. Rmutex is used to access the reader counter readcount that is mutually exclusive to the reader. Wmutex is used by the writer to wait for the reader t

Very useful for reference! Reader Writer's question--the reader's priority and the writer's priority program analysis using the semaphore

(x); Readcount--;if (readcount = 0) semsignal (wsem); semsignal (x);}} void writer () {while (true) {semwait (z);//added, but this reduces the efficiency of the write operation, but satisfies the above 2 points. After the z signal is removed, only the 1th is satisfied, and Analysis Semwait (WSEM) can be analyzed. Writeunit ();//write Data semsignal (WSEM); semsignal (z);}} Semwait in the program refers to the signal volume P operation, semsignal

Stream reader and writer (filter reader and filter writer)

possible, although not all of the text is required immediately, so that later reading speed can be faster. When the program writes a bufferedwriter, the text is placed in the buffer. Text is moved to the underlying output stream or other targets only when the buffer is full or when the writer refreshes the output explicitly, which makes writing much faster. Bufferedreader and bufferedwriter also have common methods associated with the

Reader writer-[writer first]

1. Implementation Principle First, design two threads, one reader thread, one writer thread, and two threads. The reader writer's problem is that two types of operations (read and write) can be performed on resources ). Write operations are exclusive (excluding readers and other writers), and read operations are share

Second-kill multithreading 11th reader Writer's question

As with the producer consumer Problem of the second multi-threaded tenth producer consumer problem, reader writer is also a very famous synchronization problem. The reader writer's question description is very simple, there is a

Turn---seconds to kill multithreading 11th reader Writer's question

As with the producer consumer Problem of the second multi-threaded tenth producer Consumer problem , reader writer is also a very famous synchronization problem. The reader writer's question description is very simple, there is a

Producer Consumer & Reader writer

requirements to meet the time of production, which for critical resources access will produce a certain sequence, Will increase the read speed of resources within the system. consumers point to a location where there are valid data, the producer points to the location is not valid data, and the pipe ring buffer similar to the pipe of the ring buffer to take a look at understanding it. in this picture, you can think of write as a producer, in the production of data, read can be seen as a consume

Turn---seconds to kill multithreading 14th reader Writer's question following read/write lock Srwlock

We use events and a variable that records the number of readers to solve reader-writer problems in the second-to-last multi-threaded 11th article Reader-writer question. The problem has been solved, but the code is a bit complicated. This article will introduce a new method-

Multi-threaded Face Test series (14): Reader Writer's question secondary read-write lock Srwlock

In the 11th article we use events and a variable that records the number of readers to solve reader-writer problems. The problem has been solved, but the code is a bit complicated. This article will introduce a new method-read-write lock srwlock to solve this problem. Read-write locks also distinguish between the threa

Multithreaded Programming Example 4 (writer reader question)

++) {Handle[i]= (HANDLE) _beginthreadex (NULL,0, Readerthreadfun, NULL,0, NULL); } waitformultipleobjects (Readernum+1, handle, TRUE, INFINITE); for(i =0; I 1; i++) {CloseHandle (handle[i]); } //destroying events and semaphoresCloseHandle (G_heventwriter); CloseHandle (G_heventnoreader); DeleteCriticalSection (CS); DeleteCriticalSection (cs_readernum); //Detecting Memory leaks_CrtDumpMemoryLeaks (); return 0;}I was thinking about whether to use the semaphore, and later to see http://blog.

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