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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
line wrap: on
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# snprintf.m4 serial 6
dnl Copyright (C) 2002-2004, 2007-2012 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.

dnl Libintl 0.17 will replace snprintf only if it does not support %1$s,
dnl but defers to any gnulib snprintf replacements.  Therefore, gnulib
dnl must guarantee that the decision for replacing snprintf is a superset
dnl of the reasons checked by libintl.
AC_DEFUN([gl_FUNC_SNPRINTF],
[
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  gl_cv_func_snprintf_usable=no
  AC_CHECK_FUNCS([snprintf])
  if test $ac_cv_func_snprintf = yes; then
    gl_SNPRINTF_SIZE1
    case "$gl_cv_func_snprintf_size1" in
      *yes)
        gl_SNPRINTF_RETVAL_C99
        case "$gl_cv_func_snprintf_retval_c99" in
          *yes)
            gl_PRINTF_POSITIONS
            case "$gl_cv_func_printf_positions" in
              *yes)
                gl_cv_func_snprintf_usable=yes
                ;;
            esac
            ;;
        esac
        ;;
    esac
  fi
  if test $gl_cv_func_snprintf_usable = no; then
    gl_REPLACE_SNPRINTF
  fi
  AC_CHECK_DECLS_ONCE([snprintf])
  if test $ac_cv_have_decl_snprintf = no; then
    HAVE_DECL_SNPRINTF=0
  fi
])

AC_DEFUN([gl_REPLACE_SNPRINTF],
[
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  AC_LIBOBJ([snprintf])
  if test $ac_cv_func_snprintf = yes; then
    REPLACE_SNPRINTF=1
  fi
  gl_PREREQ_SNPRINTF
])

# Prerequisites of lib/snprintf.c.
AC_DEFUN([gl_PREREQ_SNPRINTF], [:])