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#include <condition_variable>
#include <mutex>
#include <thread>
std::mutex mutex;
std::condition_variable cond;
void *
thread3(void *input)
{
std::unique_lock<std::mutex> lock(mutex);
cond.notify_all(); // Set break point at this line.
return NULL;
}
void *
thread2(void *input)
{
std::unique_lock<std::mutex> lock(mutex);
cond.notify_all();
cond.wait(lock);
return NULL;
}
void *
thread1(void *input)
{
std::thread thread_2(thread2, nullptr);
thread_2.join();
return NULL;
}
int main()
{
std::unique_lock<std::mutex> lock(mutex);
std::thread thread_1(thread1, nullptr);
cond.wait(lock);
std::thread thread_3(thread3, nullptr);
cond.wait(lock);
lock.unlock();
thread_1.join();
thread_3.join();
return 0;
}
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