141,057 questions
0
votes
2
answers
70
views
Threading in Rust with mutable objects
I'm quite new to rust and want to do two function in parallel.
shoot(&fleet_a, &mut fleet_b)
shoot(&fleet_b, &mut fleet_a)
since they only take information from one and modify some ...
- 27
0
votes
0
answers
19
views
Actix-web + Tokio: Server hangs when using tokio::spawn with Arc<Mutex> loop
I am facing an issue where my Actix-web server starts correctly, but the moment I hit the /upload_chunk endpoint from my frontend, the request hangs forever.
After some debugging, I found that the ...
- 51
1
vote
0
answers
111
views
How is a non-parallelized for loop inside an OpenMP parallel section executed?
Consider the following code:
#pragma omp parallel
for (int run = 0; run < 10; run++)
{
std::vector<int> out;
#pragma omp for
for (int i = 0; i < 1'000'000; i++)
{
...
}
}
...
- 7,475
5
votes
2
answers
180
views
Is there a difference between the C# Volatile.ReadBarrier vs Volatile.Read?
In the released .NET 10 there is a new method added to the Volatile class with the name ReadBarrier().
And I don't know whether from the compilers perspective there is a difference if I do a read with ...
0
votes
1
answer
41
views
VSPackage fibers stack tracing
I am trying to display the stack traces of RTOS fibers running in a C++ solution in VS2022. Since upgrading to Windows 11 there seems to be a problem in the implementation. The existing approach, ...
1
vote
1
answer
127
views
Why does my multithreading/pointers code print random values?
My code should print the numbers given as command line arguments. Instead it prints random-looking values.
What is going on and how can I fix it?
#include <stdio.h>
#include <pthread.h>
#...
- 29
4
votes
1
answer
97
views
Java ExecutorService detect asap thread fail
I have to run x asynchronous threads , which can last several minutes each.
They ALL have to terminate properly without exceptions.
If one fails I have to stop them all immediately and not wait ...
- 51
1
vote
1
answer
193
views
How to benchmark atomic<int> vs atomic<size_t>?
I have a bounded queue with small size that definitely fit in int. So I want to use atomic<int> instead of atomic<size_t> for indexing/counter, since int is smaller it should be faster.
...
- 1,979
0
votes
0
answers
106
views
How efficient are pipes and threads in C compared to regular function calls or pure sequential code? [closed]
I’m currently studying Operating Systems at college, and my professor has started teaching us about threads and pipes in C.
His teaching style is very practical — he expects us not only to understand ...
0
votes
1
answer
315
views
Can external IO operations be considered as if seq_cst operations in the reasoning of multithreaded programs?
Consider this example:
// thread A:
start_transaction();
update_mysql();
commit_transaction(); // remove "key" from mysql tables
remove_redis_cache("key");
// thread B:
std::...
- 7,618
12
votes
1
answer
704
views
How can I set up Thread-Local Storage (TLS) callbacks on Windows without CRT?
I'm trying to register a Thread-Local Storage (TLS) callback in a Windows application without using the C runtime (CRT).
Compiler: MSVC 14.44.35207 (Visual Studio 2022)
Target: x64
OS: Windows 11
I ...
- 131
2
votes
1
answer
44
views
How to workaround slf4j reading disk on main thread in Android?
I do have the following line in my Android app:
private Logger logger = LoggerFactory.getLogger(getClass().getSimpleName());
When testing for threads access in strict mode i found the following issue ...
- 20.6k
0
votes
2
answers
59
views
Calculate byte positions to split ndjson files into chunks
Below is the code extracted from this repo:
import os.path, io
filename = ""
n_chunks = 12 # Number of processes to use -- will split the file up into this many pieces
def ...
- 2,808
-1
votes
0
answers
137
views
Java Multithread EventHandling
I'm trying to write an audio player in Java/JavaFX and want to make a playlist play songs automatically. I have a button that triggers a new thread, and everything works fine so far.. but when the ...
0
votes
1
answer
86
views
Python gets stuck in an infinite loop restarting multiprocessing pool workers on error in initilization routine
I am trying to setup a multiprocessing Python task on Windows 10, Python 3.13. I have "main.py" module, containing the main entry, "orchestration.py" module with worker ...
- 1,859
0
votes
1
answer
162
views
Does an implementation that reorders evaluation in a single thread violate [intro.execution] p8?
[intro.execution] p8 says:
Given any two evaluations A and B, if A is sequenced before B (or, equivalently, B is sequenced after A), then the execution of A shall precede the execution of B.
...
- 7,618
3
votes
2
answers
163
views
Why std::atomic::store can be moved ahead of its argument's initialization in runtime?
I'm reading this: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p3292r0.html
Here's code sample the question is about:
int dummy;
std::atomic<int *> ptr_to_int_1{&dummy};
std::...
- 34
0
votes
1
answer
64
views
Is data synchronization necessary on single-threaded systems?
This question stems from a technical interview where I was asking candidate about multithreading, and the differences between "true multithreading" via multiple hardware cores and/or ...
- 3,144
4
votes
1
answer
105
views
Understanding usage of withFileBlocking with named pipes
The following program
assumes that /path/to/mypipe is a named pipe, e.g. created via mkfifo /path/to/mypipe, with no readers/writers waiting yet,
runs two threads, of which
the main thread keeps ...
- 30.2k
0
votes
0
answers
153
views
Is I2C device interface thread-safe on Linux?
I have a single board computer with a I2C GPIO expander device, listed as /dev/i2c-0. In my multithreaded program I open() this character device and read/write to it on separate threads using ...
- 515
0
votes
0
answers
404
views
How to enable free-threading in Python 3.14 with Python install manager?
Python has officially introduce Python install manager and free-threading feature in 3.14, but I cannot find out how to enable free-threading feature with Python install manager. Is there a way to ...
- 21
0
votes
0
answers
127
views
Is this protection method multithread safe?
I've written a MQTT client for embedded system with RTOS (understand not POSIX, generally FreeRTOS). There's no pthread in the system. There's only 32 bits atomic instructions supported.
The client ...
- 3,682
2064
votes
35
answers
1.4m
views
What is the difference between a process and a thread?
What is the technical difference between a process and a thread?
I get the feeling a word like 'process' is overused and there are also hardware and software threads. How about light-weight processes ...
- 41.2k
7
votes
1
answer
106
views
Can a channel's Drop omit Acquire ordering, as in the Rust Atomics and Locks book?
In Rust Atomics and Locks chapter 5 (available online for free), this example implementation of a one-time channel is presented:
pub struct Channel<T> {
pub message: UnsafeCell<...
- 7,431
8
votes
1
answer
252
views
Valgrind (Helgrind) is showing data race with atomic
In the following program, I want to print the output as
0102030405... so on
The 0 should be printed from one thread, odd values should be printed from second thread and even values from third thread....
- 107