Can multiple threads access same file?

You can map several regions of one file to different buffers, each buffer can be filled separately by a separate thread. It is thread safe as it is yes.

Can two threads access same object C++?

The scenarios when an object is shared between threads in C++ can be divided into two categories – a “read-only” one where the object is never modified, and a “non-read-only” one. Sometimes those mutable members are “protected” (by a mutex or equivalent) making them “thread safe”.

Can two threads use the same function?

There is nothing wrong in calling same function from different threads. If you want to ensure that your variables are consistent it is advisable to provide thread synchronization mechanisms to prevent crashes, racearound conditions.

Can multiple threads write to the same file Java?

You can use multiple threads writing a to a file e.g. a log file. Either you need to synchronize file access and only write whole record/lines, or you need to have a strategy for allocating regions of the file to different threads e.g. re-building a file with known offsets and sizes.

Can multiple threads read the same file Java?

In order to read the file, only one thread is enough. You won’t gain anything by reading from several threads.

How do threads share data with one another?

Threads are sometimes called lightweight processes because they have their own stack but can access shared data. Because threads share the same address space as the process and other threads within the process, the operational cost of communication between the threads is low, which is an advantage.

How do I share data between two threads?

You should use volatile keyword to keep the variable updated among all threads. Using volatile is yet another way (like synchronized, atomic wrapper) of making class thread safe. Thread safe means that a method or class instance can be used by multiple threads at the same time without any problem.

What happens when two threads call the same function Java?

The synchronized keyword penalizes the performance of the application, so you must only use it on methods that modify shared data in a concurrent environment. If you have multiple threads calling a synchronized method, only one will execute them at a time while the others will remain waiting.

How do you make two threads run simultaneously in Python?

Use threading. Thread. start() to run multiple functions at the same time

1. def a():
2. print(“Function a is running at time: ” + str(int(time. time())) + ” seconds.”)
3. def b():
4. print(“Function b is running at time: ” + str(int(time. time())) + ” seconds.”)
5. threading. Thread(target=a). start()
6. threading. Thread(target=b).

What is a Blockingqueue?

A blocking queue is a queue that blocks when you try to dequeue from it and the queue is empty, or if you try to enqueue items to it and the queue is already full. A thread trying to dequeue from an empty queue is blocked until some other thread inserts an item into the queue.

What is Java FileWriter?

Java FileWriter class of java.io package is used to write data in character form to file. FileWriter is meant for writing streams of characters. For writing streams of raw bytes, consider using a FileOutputStream. FileWriter creates the output file if it is not present already.

How do I read multiple threads from a file?

Using more than one thread to read a file is usually a really bad idea….As per my understanding, we have below options:

1. Read each file line by line sequentially.
2. Read files in parallel in different threads line by line.
3. Read each file using buffers sequentially.
4. Read files in parallel using buffers in different threads.

Can two threads access the same synchronized method on the same object?

Two threads cannot access the same synchronized method on the same object instance. One will get the lock and the other will block until the first thread leaves the method. In your example, instance methods are synchronized on the object that contains them.

Why can’t two threads lock the same object?

It depends on what object instance the two threads are trying to lock on. Two threads cannot access the same synchronized method on the same object instance. One will get the lock and the other will block until the first thread leaves the method.

Can multiple threads call the same method at the same time?

And indeed, if needed each thread can (via recursion) call the same method on the same instance multiple timesif you really want. However, what mighttrip you up is if you are using statein that object (instance or static fields, etc, and anything related fromthat state).

How does thread2 work?

Thread 2 comes along and grabs that same pointer unaware that the object is already on the “operating table” being modified by Thread 1 and it tries to go about doing what it intended, only to find that what Thread 2 thought it really knew about the object was incorrect due to Thread 1’s modifications.