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poll/select: prevent busy-waiting 2012-05-21 Paolo Bonzini <bonzini@gnu.org> poll/select: prevent busy-waiting. SwitchToThread() only gives away the rest of the current time slice to another thread in the current process. So if the thread that feeds the file decscriptor we're polling is not in the current process, we get busy-waiting. * lib/poll.c: Use SleepEx(1, TRUE) instead of SwitchToThread(). Patch from Theodore Leblond. * lib/select.c: Split polling out of the loop that sets the output fd_sets. Check for zero result and loop if the wait timeout is infinite.
author Paolo Bonzini <bonzini@gnu.org>
date Mon, 21 May 2012 09:52:42 +0200
parents 8250f2777afc
children e542fd46ad6f
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# no-c++.m4 serial 1
dnl Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# Support for C source files that cannot be compiled by a C++ compiler.
# Set NO_CXX to the C++ compiler flags needed to request C mode instead of
# C++ mode.
# So far only g++ is supported.

AC_DEFUN([gt_NO_CXX],
[
  NO_CXX=
  AC_EGREP_CPP([Is g++], [
#if defined __GNUC__ && defined __cplusplus
  Is g++
#endif
    ],
    [NO_CXX="-x c"])
  AC_SUBST([NO_CXX])
])