питон либ луна питонлиб солнце progerlib цветок

Change theme

Login Register
Avatar ·

std::unique_lock vs std::lock_guard: what to choose for a mutex in C++?

Hello! I started learning multithreading in C++11 and got confused about choosing between std::unique_lock and std::lock_guard. Both classes are used for locking a mutex, but I don't understand in which cases to use which.\n\nFor example, I'm writing a simple thread-safe counter:\n\n```cpp\n#include \n#include \n#include \n\nstd::mutex mtx;\nint counter = 0;\n\nvoid increment() {\n for (int i = 0; i < 100000; ++i) {\n // What is better here?\n std::lock_guard lock(mtx);\n // or\n std::unique_lock lock(mtx);\n ++counter;\n }\n}\n```\n\nBoth options compile and work. But I heard that unique_lock is "heavier". When should it be used? Are there situations where lock_guard is not suitable? And why in
0 responses

Similar questions

Android Room: how to fix "Cannot access database on the main thread" error with a simple SELECT query? How to import a module from another file in the same Rust project? How to get all the combinations of numbers in Python correctly How to get type T from an instance of a generic class or method in C#? How to insert an element into an array at a specified index in JavaScript?