implementing multi-threaded access to std::vector in C++17 causing segmentation fault
I'm prototyping a solution and I've been working on this all day and I'm stuck trying to I'm attempting to set up I'm sure I'm missing something obvious here, but I am currently working with a question when trying to access `std::vector` from multiple threads using C++17..... The vector is being modified in one thread while being read in another, leading to a segmentation fault. Here's a simplified version of my code: ```cpp #include <iostream> #include <vector> #include <thread> #include <mutex> std::vector<int> myVector; std::mutex mtx; void writer() { for (int i = 0; i < 100; ++i) { std::lock_guard<std::mutex> lock(mtx); myVector.push_back(i); } } void reader() { for (int i = 0; i < 100; ++i) { std::lock_guard<std::mutex> lock(mtx); if (!myVector.empty()) { std::cout << "Read: " << myVector.back() << std::endl; } } } int main() { std::thread t1(writer); std::thread t2(reader); t1.join(); t2.join(); return 0; } ``` I've included a mutex around both the write and read access to the vector, but I’m still experiencing segmentation faults when I run this code. The scenario seems to manifest under high load, but I can’t reproduce it consistently. I've tried switching to `std::shared_mutex` to allow for concurrent reads, but that led to even more crashes. My understanding is that while one thread is writing, the other should be blocked from reading, so I thought using `std::lock_guard` in this way would suffice. Looking at the output, it appears that sometimes the `reader` thread tries to access `myVector` right after the `writer` has pushed a new element, but before the vector is fully updated in memory. How can I ensure safe access to the vector from multiple threads without running into these issues? Any insights or adjustments to my approach would be greatly appreciated! I'm working on a API that needs to handle this. I'd really appreciate any guidance on this. Any ideas what could be causing this? Any examples would be super helpful. My development environment is Ubuntu 20.04. For context: I'm using Cpp on Debian. Thanks, I really appreciate it!