std::thread::joinable
From cppreference.com
bool joinable() const;
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(since C++11) | |
Checks if the thread object identifies an active thread of execution. Specifically, returns true if get_id() != std::thread::id(). So a default constructed thread is not joinable.
A thread that has finished executing code, but has not yet been joined is still considered an active thread of execution and is therefore joinable.
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[edit] Parameters
(none)
[edit] Return value
true if the thread object identifies an active thread of execution, false otherwise
[edit] Exceptions
noexcept specification:
noexcept
[edit] Example
Run this code
#include <iostream> #include <thread> #include <chrono> void foo() { std::this_thread::sleep_for(std::chrono::seconds(1)); } int main() { std::thread t; std::cout << "before starting, joinable: " << t.joinable() << '\n'; t = std::thread(foo); std::cout << "after starting, joinable: " << t.joinable() << '\n'; t.join(); }
Output:
before starting, joinable: 0 after starting, joinable: 1
[edit] See also
returns the id of the thread (public member function) |
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waits for a thread to finish its execution (public member function) |
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permits the thread to execute independently from the thread handle (public member function) |
[edit] References
- C++11 standard (ISO/IEC 14882:2011):
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- 30.3.1.5 thread members [thread.thread.member]