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#include <mutex>
#include <thread>

const size_t max_threads = 10;

void do_work(size_t i, std::mutex *pm) {
  std::lock_guard<std::mutex> guardlk(*pm);

  // Access data protected by the lock.
}

void start_threads() {
  std::thread threads[max_threads];
  std::mutex m;

  for (size_t i = 0; i < max_threads; ++i) {
    threads[i] = std::thread(do_work, i, &m);
  }
}

#include <mutex>
#include <thread>

const size_t max_threads = 10;

void do_work(size_t i, std::mutex *pm) {
  std::lock_guard<std::mutex> guardlk(*pm);

  // Access data protected by the lock.
}

std::mutex m;

void start_threads() {
  std::thread threads[max_threads];

  for (size_t i = 0; i < max_threads; ++i) {
    threads[i] = std::thread(do_work, i, &m);
  }
}

#include <mutex>
#include <thread>

const size_t max_threads = 10;

void do_work(size_t i, std::mutex *pm) {
  std::lock_guard<std::mutex> guardlk(*pm);

  // Access data protected by the lock.
}
void run_threads() {
  std::thread threads[max_threads];
  std::mutex m;

  for (size_t i = 0; i < max_threads; ++i) {
    threads[i] = std::thread(do_work, i, &m);
  }

  for (size_t i = 0; i < max_threads; ++i) {
    threads[i].join();
  }
}