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Showing content from https://cplusplus.com/reference/thread/thread/joinable/ below:

public member function

<thread>

bool joinable() const noexcept;

Check if joinable

A thread object is joinable if it represents a thread of execution.

A thread object is not joinable in any of these cases:

• if it was default-constructed.
• if it has been moved from (either constructing another thread object, or assigning to it).
• if either of its members join or detach has been called.

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// example for thread::joinable
#include <iostream>       // std::cout
#include <thread>         // std::thread
 
void mythread() 
{
  // do stuff...
}
 
int main() 
{
  std::thread foo;
  std::thread bar(mythread);

  std::cout << "Joinable after construction:\n" << std::boolalpha;
  std::cout << "foo: " << foo.joinable() << '\n';
  std::cout << "bar: " << bar.joinable() << '\n';

  if (foo.joinable()) foo.join();
  if (bar.joinable()) bar.join();

  std::cout << "Joinable after joining:\n" << std::boolalpha;
  std::cout << "foo: " << foo.joinable() << '\n';
  std::cout << "bar: " << bar.joinable() << '\n';

  return 0;
}

Joinable after construction:
foo: false
bar: true
Joinable after joining:
foo: false
bar: false

thread::join

Join thread (public member function)

thread::get_id

Get thread id (public member function)

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