tas_spin_lock.cpp

#include "pls/internal/base/tas_spin_lock.h"
#include "pls/internal/base/backoff.h"

namespace pls {
namespace internal {
namespace base {

void tas_spin_lock::lock() {
  backoff backoff_strategy;

  while (true) {
    if (flag_.test_and_set(std::memory_order_acquire) == 0) {
      return;
    }
    backoff_strategy.do_backoff();
  }
}

bool tas_spin_lock::try_lock(unsigned int num_tries) {
  backoff backoff_strategy;

  while (true) {
    if (flag_.test_and_set(std::memory_order_acquire) == 0) {
      return true;
    }

    num_tries--;
    if (num_tries <= 0) {
      return false;
    }

    backoff_strategy.do_backoff();
  }
}

void tas_spin_lock::unlock() {
  flag_.clear(std::memory_order_release);
}

}
}
}