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Showing content from https://cplusplus.com/reference/mutex/unique_lock/owns_lock/ below:

public member function

<mutex>

bool owns_lock() const noexcept;

Owns lock

This is true if the managed mutex object was locked (or adopted) by the unique_lock object, and hasn't been unlocked or released since.

In all other cases, it is false.

This is an alias of unique_lock::operator bool.

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// unique_lock::operator= example
#include <iostream>       // std::cout
#include <vector>         // std::vector
#include <thread>         // std::thread
#include <mutex>          // std::mutex, std::unique_lock, std::try_to_lock

std::mutex mtx;           // mutex for critical section

void print_star () {
  std::unique_lock<std::mutex> lck(mtx,std::try_to_lock);
  // print '*' if successfully locked, 'x' otherwise: 
  if (lck.owns_lock())
    std::cout << '*';
  else                    
    std::cout << 'x';
}

int main ()
{
  std::vector<std::thread> threads;
  for (int i=0; i<500; ++i)
    threads.emplace_back(print_star);

  for (auto& x: threads) x.join();

  return 0;
}

*************************x*****************************x************************
******************************x*x***********************************************
********************************************************************************
**x**x*x**x**********************************************x**********************
************************************x*******************************************
********************************************************************************
***x****************

unique_lock::mutex

Get mutex (public member function)

unique_lock::unlock

Unlock mutex (public member function)

unique_lock::~unique_lock

Destroy unique_lock (public member function)

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