std::jthread::detach
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std::jthread
Member functions
Observers
Operations
jthread::detach
Stop token handling
Non-member functions
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
checks whether the thread is joinable, i.e. potentially running in parallel context
(public member function) [edit]
(public member function) [edit]
C documentation for thrd_detach