Multi-thread | My C/C implementation of classic multi-thread models | Game Engine library

I am having trouble understanding how to get simple multi-threading to work in python. Here is a simple script I have written in python that should simultaneously write to two different files:

I am writing a small TCP sockets "library", and I ran into much trouble.

When something happens to the socket that causes it to be instantly closed and freed (regardless of background lingering, talking about user space here), which is only done within a locked mutex since the application I'm writing is multi-threaded, I need a way to tell all the other (potentially) waiting threads (on the same mutex) that want to do something with the socket: "I'm terribly sorry, but the socket has been destroyed and you cannot access it" so that they don't cause any segmentation fault or such.

The idea I had was: the mutex was part of the socket (socket = a structure that contains multiple things, including a mutex and a file descriptor) so I couldn't quite free the socket if other threads were waiting for it (undefined behavior), so the possible solution is to allocate the mutex, free the socket but not the mutex, set some flag (in the allocated memory) saying that the socket has been closed, and a counter so that the last thread waking up and getting notified that it cannot use the socket unlocks and destroys the mutex and frees the memory allocated. The mutex can still be accessed without segfault if we just store its pointer before acquiring the mutex (and the pointer won't ever change).

This solution has a fundamental problem though - what if between unlocking the mutex and freeing it by the last holder, the thread gets preempted and another one locks the mutex again (since you NEED to check socket-related stuff after you acquire the lock, so no way of knowing it got destroyed, unless you maybe use an atomic variable but then again, checking the atomic variable and locking the mutex as a whole are not an atomic operation). Or if you try to access the mutex on the already-freed socket. Undefined behavior emerges.

Any ideas how to solve this problem? I.e. how to destroy a socket so that other threads know about it to quit safely, and there are no race conditions? By quitting I mean aborting the socket function they were in, not cancelling or stopping the threads themselves.

I'm trying to use the python multiprocessing module to run a server in another Thread using the http.server.BaseHTTPRequestHandler module. I am stuck though and am running into a '_thread.lock' issue.

I don't want to use the threading module because I'd rather use true multi-threading with the multi-processing module.

If anyone knows what I am doing incorrectly or can point me to a good library to use that would be awesome.

when i run

Here are a few lines of code which I wrote to test hashmap's performance in a multi-threading environment. I know that hashmap may cause deadlock with java8, but I am using java 11. It does not throw any exception, and never stop. Can someone help me to understand why? Thank you.

Response is a very simple entity class.

dealock

Response.java

I'm using Django and I need to send many requests, there is any way to send it on multi-thread? This is my code.

I followed the official Rust documentation that shows you how to write a multi-threaded HTTP server. They walk you through constructing a thread pool that's backed by individual workers, where each worker has its own thread. The thread pool will execute Job instances and pass them along to workers through the MPSC implementation.

This is what the code looks like, per the docs, and the full guide is here.

I am new to multi-threading but learned this is very useful for my use case. I have an initial queue of tasks to run and the below program approach will help me.

Trying to make a simple multi-threaded programme where it prints Factorial series where each number is printed by different Thread and at the end I am giving a report of which number printed by which thread.I have got the desired output but somehow my program is not terminating.

Constraint: I am not allowed to use Concurrent Package