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#ifndef MYGRATE_TEST_SEMAPHORE_H
#define MYGRATE_TEST_SEMAPHORE_H
#if __has_include(<semaphore>)
# include <semaphore>
#endif
#ifdef __cpp_lib_semaphore
using semaphore = std::binary_semaphore;
#else
# include <mutex>
class semaphore {
public:
explicit semaphore(unsigned int v_);
void release(unsigned int n = 1);
void acquire();
private:
bool try_dec();
unsigned int v;
std::mutex m;
};
#endif
#endif
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