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/usr/include/choreonoid-1.1/cnoid/src/Util/Sleep.h is in libcnoid-dev 1.1.0+dfsg-6.1+b4.

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#ifndef CNOID_UTIL_TIME_MEASURE_H_INCLUDED
#define CNOID_UTIL_TIME_MEASURE_H_INCLUDED

#ifdef WIN32
#include <windows.h>

namespace cnoid {
    inline void msleep(int msec){
        ::Sleep(msec);
    }
    inline void usleep(int usec){
        ::Sleep(usec / 1000);
    }
}

#else

#include <unistd.h>

namespace cnoid {
    inline void msleep(int msec){
        ::usleep(msec * 1000);
    }
    inline void usleep(int usec){
        ::usleep(usec);
    }
}

#endif

#endif