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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
line source

# fprintf-posix.m4 serial 14
dnl Copyright (C) 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.

AC_DEFUN([gl_FUNC_FPRINTF_POSIX],
[
  AC_REQUIRE([gl_PRINTF_SIZES_C99])
  AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
  AC_REQUIRE([gl_PRINTF_INFINITE])
  AC_REQUIRE([gl_PRINTF_INFINITE_LONG_DOUBLE])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_A])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_F])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_N])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_LS])
  AC_REQUIRE([gl_PRINTF_POSITIONS])
  AC_REQUIRE([gl_PRINTF_FLAG_GROUPING])
  AC_REQUIRE([gl_PRINTF_FLAG_LEFTADJUST])
  AC_REQUIRE([gl_PRINTF_FLAG_ZERO])
  AC_REQUIRE([gl_PRINTF_PRECISION])
  AC_REQUIRE([gl_PRINTF_ENOMEM])
  gl_cv_func_fprintf_posix=no
  case "$gl_cv_func_printf_sizes_c99" in
    *yes)
      case "$gl_cv_func_printf_long_double" in
        *yes)
          case "$gl_cv_func_printf_infinite" in
            *yes)
              case "$gl_cv_func_printf_infinite_long_double" in
                *yes)
                  case "$gl_cv_func_printf_directive_a" in
                    *yes)
                      case "$gl_cv_func_printf_directive_f" in
                        *yes)
                          case "$gl_cv_func_printf_directive_n" in
                            *yes)
                              case "$gl_cv_func_printf_directive_ls" in
                                *yes)
                                  case "$gl_cv_func_printf_positions" in
                                    *yes)
                                      case "$gl_cv_func_printf_flag_grouping" in
                                        *yes)
                                          case "$gl_cv_func_printf_flag_leftadjust" in
                                            *yes)
                                              case "$gl_cv_func_printf_flag_zero" in
                                                *yes)
                                                  case "$gl_cv_func_printf_precision" in
                                                    *yes)
                                                      case "$gl_cv_func_printf_enomem" in
                                                        *yes)
                                                          # fprintf exists and is
                                                          # already POSIX compliant.
                                                          gl_cv_func_fprintf_posix=yes
                                                          ;;
                                                      esac
                                                      ;;
                                                  esac
                                                  ;;
                                              esac
                                              ;;
                                          esac
                                          ;;
                                      esac
                                      ;;
                                  esac
                                  ;;
                              esac
                              ;;
                          esac
                          ;;
                      esac
                      ;;
                  esac
                  ;;
              esac
              ;;
          esac
          ;;
      esac
      ;;
  esac
  if test $gl_cv_func_fprintf_posix = no; then
    gl_PREREQ_VASNPRINTF_LONG_DOUBLE
    gl_PREREQ_VASNPRINTF_INFINITE_DOUBLE
    gl_PREREQ_VASNPRINTF_INFINITE_LONG_DOUBLE
    gl_PREREQ_VASNPRINTF_DIRECTIVE_A
    gl_PREREQ_VASNPRINTF_DIRECTIVE_F
    gl_PREREQ_VASNPRINTF_DIRECTIVE_LS
    gl_PREREQ_VASNPRINTF_FLAG_GROUPING
    gl_PREREQ_VASNPRINTF_FLAG_LEFTADJUST
    gl_PREREQ_VASNPRINTF_FLAG_ZERO
    gl_PREREQ_VASNPRINTF_PRECISION
    gl_PREREQ_VASNPRINTF_ENOMEM
    gl_REPLACE_VASNPRINTF
    gl_REPLACE_FPRINTF
  fi
])

AC_DEFUN([gl_REPLACE_FPRINTF],
[
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  AC_LIBOBJ([fprintf])
  REPLACE_FPRINTF=1
  AC_DEFINE([REPLACE_FPRINTF_POSIX], [1],
    [Define if fprintf is overridden by a POSIX compliant gnulib implementation.])
  gl_PREREQ_FPRINTF
])

AC_DEFUN([gl_PREREQ_FPRINTF], [:])