posix_time.h

#pragma once
#ifndef CATA_SRC_POSIX_TIME_H
#define CATA_SRC_POSIX_TIME_H

// Compatibility header.  On POSIX, just include <ctime>.  On Windows, provide
// our own nanosleep implementation.

#include <ctime> // IWYU pragma: keep

#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(WINPTHREAD_API)
/* Windows platforms.  */

/* Windows lacks the nanosleep() function. The following code was stuffed
   together from GNUlib (http://www.gnu.org/software/gnulib/), which is
   licensed under the GPLv3. */

enum { BILLION = 1000 * 1000 * 1000 };

#   if defined(__cplusplus)
extern "C" {
#   endif

// Apparently this is defined by pthread.h, if that header had been included.
// _INC_TIME is defined in time.h for MSVC
// __struct_timespec_defined is defined in time.h for MinGW on Windows
#if !defined(_TIMESPEC_DEFINED) && !defined(_INC_TIME) && !__struct_timespec_defined
#define _TIMESPEC_DEFINED
struct timespec {
    time_t tv_sec;
    long int tv_nsec;
};
#endif

#   if defined(__cplusplus)
}
#   endif

#include "platform_win.h"

/* The Win32 function Sleep() has a resolution of about 15 ms and takes
   at least 5 ms to execute.  We use this function for longer time periods.
   Additionally, we use busy-looping over short time periods, to get a
   resolution of about 0.01 ms.  In order to measure such short time spans,
   we use the QueryPerformanceCounter() function.  */

int
nanosleep( const struct timespec *requested_delay,
           struct timespec *remaining_delay );

#endif
#endif // CATA_SRC_POSIX_TIME_H