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annotate m4/strerror.m4 @ 16869:38e6d30d7e4d

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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 d9b4f726faa7
children e542fd46ad6f
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1 # strerror.m4 serial 17
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2 dnl Copyright (C) 2002, 2007-2012 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
7c1a6b73f48e An autoconf macro for its associated module.
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7 AC_DEFUN([gl_FUNC_STRERROR],
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8 [
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9 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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10 AC_REQUIRE([gl_HEADER_ERRNO_H])
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11 AC_REQUIRE([gl_FUNC_STRERROR_0])
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12 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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13 m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
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14 AC_REQUIRE([gl_FUNC_STRERROR_R_WORKS])
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15 ])
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16 if test "$ERRNO_H:$REPLACE_STRERROR_0" = :0; then
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17 AC_CACHE_CHECK([for working strerror function],
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18 [gl_cv_func_working_strerror],
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19 [AC_RUN_IFELSE(
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20 [AC_LANG_PROGRAM(
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21 [[#include <string.h>
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22 ]],
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23 [[if (!*strerror (-2)) return 1;]])],
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24 [gl_cv_func_working_strerror=yes],
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25 [gl_cv_func_working_strerror=no],
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26 [case "$host_os" in
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27 # Guess yes on glibc systems.
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28 *-gnu*) gl_cv_func_working_strerror="guessing yes" ;;
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29 # If we don't know, assume the worst.
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30 *) gl_cv_func_working_strerror="guessing no" ;;
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31 esac
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32 ])
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33 ])
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34 case "$gl_cv_func_working_strerror" in
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35 *yes) ;;
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36 *)
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37 dnl The system's strerror() fails to return a string for out-of-range
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38 dnl integers. Replace it.
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39 REPLACE_STRERROR=1
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40 ;;
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41 esac
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42 m4_ifdef([gl_FUNC_STRERROR_R_WORKS], [
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43 dnl If the system's strerror_r or __xpg_strerror_r clobbers strerror's
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44 dnl buffer, we must replace strerror.
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45 case "$gl_cv_func_strerror_r_works" in
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46 *no) REPLACE_STRERROR=1 ;;
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47 esac
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48 ])
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49 else
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50 dnl The system's strerror() cannot know about the new errno values we add
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51 dnl to <errno.h>, or any fix for strerror(0). Replace it.
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52 REPLACE_STRERROR=1
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53 fi
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54 ])
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55
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56 dnl Detect if strerror(0) passes (that is, does not set errno, and does not
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57 dnl return a string that matches strerror(-1)).
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58 AC_DEFUN([gl_FUNC_STRERROR_0],
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59 [
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60 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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61 REPLACE_STRERROR_0=0
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62 AC_CACHE_CHECK([whether strerror(0) succeeds],
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63 [gl_cv_func_strerror_0_works],
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64 [AC_RUN_IFELSE(
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65 [AC_LANG_PROGRAM(
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66 [[#include <string.h>
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67 #include <errno.h>
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68 ]],
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69 [[int result = 0;
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70 char *str;
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71 errno = 0;
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72 str = strerror (0);
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73 if (!*str) result |= 1;
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74 if (errno) result |= 2;
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75 if (strstr (str, "nknown") || strstr (str, "ndefined"))
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76 result |= 4;
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77 return result;]])],
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78 [gl_cv_func_strerror_0_works=yes],
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79 [gl_cv_func_strerror_0_works=no],
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80 [case "$host_os" in
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81 # Guess yes on glibc systems.
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82 *-gnu*) gl_cv_func_strerror_0_works="guessing yes" ;;
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83 # If we don't know, assume the worst.
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84 *) gl_cv_func_strerror_0_works="guessing no" ;;
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85 esac
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86 ])
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87 ])
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88 case "$gl_cv_func_strerror_0_works" in
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89 *yes) ;;
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90 *)
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91 REPLACE_STRERROR_0=1
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92 AC_DEFINE([REPLACE_STRERROR_0], [1], [Define to 1 if strerror(0)
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93 does not return a message implying success.])
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94 ;;
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95 esac
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96 ])