ardupilot/libraries/AP_HAL_Empty/Semaphores.h

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#ifndef __AP_HAL_EMPTY_SEMAPHORE_H__
#define __AP_HAL_EMPTY_SEMAPHORE_H__
#include <AP_HAL_Empty.h>
class Empty::EmptySemaphore : public AP_HAL::Semaphore {
public:
EmptySemaphore() : _taken(false) {}
bool give();
bool take(uint32_t timeout_ms);
bool take_nonblocking();
private:
bool _taken;
};
#endif // __AP_HAL_EMPTY_SEMAPHORE_H__