// Returns nonzero if a keystroke is waiting to be read; otherwise returns zero.
extern "C" int __cdecl _kbhit()
{
__acrt_lock(__acrt_conio_lock);
int result = 0;
__try
{
result = _kbhit_nolock();
}
__finally
{
__acrt_unlock(__acrt_conio_lock);
}
return result;
}
int __cdecl _kbhit (
void
)
{
int retval;
_mlock(_CONIO_LOCK); /* secure the console lock */
__TRY
retval = _kbhit_nolock(); /* determine if a key is waiting */
__FINALLY
_munlock(_CONIO_LOCK); /* release the console lock */
__END_TRY_FINALLY
return retval;
}