All Questions
Tagged with c++ multithreading
18,229
questions
2
votes
0
answers
46
views
Synchronizing simulation output generation and reading using producer and consumer threads in C++
Beginner level synchronization question here.
There’s a lot of material on how to implement producer-consumer synchronization. I really did try all variations that I thought made sense, but none seems ...
- 23
-1
votes
0
answers
43
views
How to debug hanging notify_all() call in linux [closed]
I have an incidence where notify_all() does not seem to exit properly. Based on this answer notify_all() should return in any case.
I have producer code in the following form:
void producer() {
...
0
votes
0
answers
40
views
How would I take input and output data on multiple tmux terminal using a cpp program?
The code below creates two panes in tmux and counts down to 20.
#include <iostream>
#include <fstream>
#include <thread>
#include <vector>
#include <chrono>
#include <...
- 13
1
vote
3
answers
110
views
Is std::move_only_function thread safe?
Is it safe to call a std::move_only_function object in one thread and replace the function it points to in another thread?
My code:
#include <future>
#include <functional>
int main() {
...
- 5,679
0
votes
1
answer
35
views
PyTorch C++ extension: efficiently accumulate results from threads in tensor
I am implementing a PyTorch C++ extension that employs parallellism. The desired result is a N x D matrix, and each thread computes one row of this result. What is the recommended way to accumulate ...
0
votes
1
answer
46
views
Qt/QML - Getting *qml* stack trace from Non UI thread is always crashing
In a certain QML app there is a problem that sometimes QML scripts hang UI thread for very long times, like 20+ seconds of UI thread not processing any incoming events from any source. In rare cases ...
- 1,600
0
votes
0
answers
50
views
How can I add parallelism to nested loops here?
I am currently developing a c++ minecraft clone in sfml and am trying to implement parallelism for rendering and modifying the chunks using a thread pool. The main issue I am currently facing is how ...
- 7
1
vote
5
answers
154
views
Is statement in C++, i.e., instructions ends with semi-colon ';', executed as a whole in multi-thread context?
Say I have a std::atomic called num:
std::atomic<double> num{3.1415};
as C++ does not completely support arithmetic operations for atomics except for "integral types", I cannot do:
...
- 33
3
votes
1
answer
79
views
When constructing a new std::thread, is there a point to wrapping the callable in std::bind?
I'm pretty unfamiliar with modern C++, but I've been looking at the Boost.Beast sample files and trying to understand how they work.
Specifically, I've been looking at this http server sample.
Here's ...
- 31
0
votes
0
answers
35
views
Is VSTest's Logger::WriteMessage not thread-safe?
I am seeing unexplained test failures when using Visual Studio 2022's VSTest's Logger::WriteMessage from multiple threads. In normal runs, I see
Test Run Successful.
Total tests: 26
Passed: 26
...
- 5,407
-1
votes
4
answers
114
views
Lock based concurrent vector
I am starting with designing thread safe data structure and looking to implement a concurrent vector that hides multi-threading complexity for the user and that offers thread safe clear function (...
- 31
0
votes
0
answers
61
views
Right memory_order to react on atomic increment changes in other thread?
Consider such code:
#include <atomic>
#include <thread>
bool read_from_network() noexcept;
void write_to_network() noexcept;
int main() {
std::atomic<size_t> work_counter;
std:...
- 7,932
0
votes
1
answer
63
views
Guarding tests against exit/death
I'm using googletest to test multi-threading code with std::thread. In broken code, it often happens that a std::thread is destroyed before the thread has joined, causing a program termination. ...
- 567
0
votes
0
answers
55
views
C++ threads - async takes almost the same time to execute [duplicate]
As a novice in C++ threads, I am a little bit confused. The std::async, for 1024 function calls, has almost the same duration like the 1024 calls of the same function. My intention is to demostrate (...
1
vote
0
answers
74
views
Why am I getting cache miss while accessing a variable, only updated by the same thread?
I am trying to measure cache misses in a multi-threaded application using perf_event_open on Linux. The code involves two threads: Thread t1, that updates an aligned integer (x) and another thread t2 ...
- 51