std::jthread::detach
From cppreference.com
| void detach(); |
(since C++20) | |
Separates the thread of execution from the jthread object, allowing execution to continue independently. Any allocated resources will be freed once the thread exits.
After calling detach *this no longer owns any thread.
Contents |
[edit] Parameters
(none)
[edit] Return value
(none)
[edit] Postconditions
joinable is false.
[edit] Exceptions
std::system_error if joinable() == false or an error occurs.
[edit] Example
Run this code
#include <chrono> #include <iostream> #include <thread> void independentThread() { std::cout << "Starting concurrent thread.\n"; std::this_thread::sleep_for(std::chrono::seconds(2)); std::cout << "Exiting concurrent thread.\n"; } void threadCaller() { std::cout << "Starting thread caller.\n"; std::jthread t(independentThread); t.detach(); std::this_thread::sleep_for(std::chrono::seconds(1)); std::cout << "Exiting thread caller.\n"; } int main() { threadCaller(); std::this_thread::sleep_for(std::chrono::seconds(5)); }
Possible output:
Starting thread caller. Starting concurrent thread. Exiting thread caller. Exiting concurrent thread.
[edit] References
- C++23 standard (ISO/IEC 14882:2024):
- 33.4.4.3 Members [thread.jthread.mem]
- C++20 standard (ISO/IEC 14882:2020):
- 32.4.3.2 Members [thread.jthread.mem]
[edit] See also
| waits for the thread to finish its execution (public member function) | |
| checks whether the thread is joinable, i.e. potentially running in parallel context (public member function) | |
| C documentation for thrd_detach
| |
