o2usleep.h

// o2usleep.h -- cross-platform definition of usleep()
//
// Roger B. Dannenberg
// Oct 2020
//
// This file should be included first because if someone includes <unistd.h>
// before this file sets _POSIX_C_SOURCE, then usleep() will not be defined.
// link with o2usleep.c so that usleep() will be implemented for Windows
 
#ifdef WIN32
#  include <windows.h>
#  define usleep(usec) Sleep((usec) / 1000)
#else
#if defined(__linux__) && defined(__GNUC__)
// #    define _XOPEN_SOURCE 500
// #    define _POSIX_C_SOURCE 200112L
#  include <sys/time.h>
#endif
#include <unistd.h>
#endif