Mercurial > gnulib
view m4/pthread_sigmask.m4 @ 40177:dcd889592b62
dtoastr,ftoastr,ldtoastr: port to c-strtod changes
Decouple these modules from c-strtod. Nowadays it’s reasonable to
assume the C99 signatures for strtod and strtold. Programs that
require stricter adherence to C99 should also use the strtod and
strtold modules as needed, and we no longer need the
HAVE_C99_STRTOLD macro.
* NEWS: Mention this.
* lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold.
* m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD.
* modules/dtoastr, modules/ftoastr, modules/ldtoastr:
(Files): Remove m4/c-strtod.m4.
(configure.ac): Do not require gl_C99_STRTOLD, which no longer
exists.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 02 Feb 2019 13:01:55 -0800 |
parents | b06060465f09 |
children |
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# pthread_sigmask.m4 serial 16 dnl Copyright (C) 2011-2019 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_PTHREAD_SIGMASK], [ AC_REQUIRE([gl_SIGNAL_H_DEFAULTS]) AC_CHECK_FUNCS_ONCE([pthread_sigmask]) LIB_PTHREAD_SIGMASK= dnl Test whether the gnulib module 'threadlib' is in use. dnl Some packages like Emacs use --avoid=threadlib. dnl Write the symbol in such a way that it does not cause 'aclocal' to pick dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/. m4_ifdef([gl_][THREADLIB], [ AC_REQUIRE([gl_][THREADLIB]) if test "$gl_threads_api" = posix; then if test $ac_cv_func_pthread_sigmask = yes; then dnl pthread_sigmask is available without -lpthread. : else if test -n "$LIBMULTITHREAD"; then AC_CACHE_CHECK([for pthread_sigmask in $LIBMULTITHREAD], [gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD], [gl_save_LIBS="$LIBS" LIBS="$LIBS $LIBMULTITHREAD" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <pthread.h> #include <signal.h> ]], [[return pthread_sigmask (0, (sigset_t *) 0, (sigset_t *) 0);]]) ], [gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=yes], [gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=no]) LIBS="$gl_save_LIBS" ]) if test $gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD = yes; then AC_CACHE_CHECK([whether pthread_sigmask is only a macro], [gl_cv_func_pthread_sigmask_is_macro], [gl_save_LIBS="$LIBS" LIBS="$LIBS $LIBMULTITHREAD" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <pthread.h> #include <signal.h> #undef pthread_sigmask ]], [[return pthread_sigmask (0, (sigset_t *) 0, (sigset_t *) 0);]]) ], [gl_cv_func_pthread_sigmask_is_macro=no], [gl_cv_func_pthread_sigmask_is_macro=yes]) LIBS="$gl_save_LIBS" ]) if test $gl_cv_func_pthread_sigmask_is_macro = yes; then dnl On MinGW pthread_sigmask is just a macro which always returns 0. dnl It does not exist as a real function, which is required by POSIX. REPLACE_PTHREAD_SIGMASK=1 gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=no fi fi if test $gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD = yes; then dnl pthread_sigmask is available with -pthread or -lpthread. LIB_PTHREAD_SIGMASK="$LIBMULTITHREAD" else dnl pthread_sigmask is not available at all. HAVE_PTHREAD_SIGMASK=0 fi else dnl pthread_sigmask is not available at all. HAVE_PTHREAD_SIGMASK=0 fi fi else dnl pthread_sigmask may exist but does not interoperate with the chosen dnl multithreading facility. dnl If "$gl_threads_api" = pth, we could use the function pth_sigmask, dnl but it is equivalent to sigprocmask, so we choose to emulate dnl pthread_sigmask with sigprocmask also in this case. This yields fewer dnl link dependencies. if test $ac_cv_func_pthread_sigmask = yes; then REPLACE_PTHREAD_SIGMASK=1 else HAVE_PTHREAD_SIGMASK=0 fi fi ], [ dnl The module 'threadlib' is not in use, due to --avoid=threadlib being dnl specified. dnl The package either has prepared CPPFLAGS and LIBS for use of POSIX:2008 dnl threads, or wants to build single-threaded programs. if test $ac_cv_func_pthread_sigmask = yes; then dnl pthread_sigmask exists and does not require extra libraries. dnl Assume that it is declared. : else dnl pthread_sigmask either does not exist or needs extra libraries. HAVE_PTHREAD_SIGMASK=0 dnl Define the symbol rpl_pthread_sigmask, not pthread_sigmask, dnl so as to not accidentally override the system's pthread_sigmask dnl symbol from libpthread. This is necessary on IRIX 6.5. REPLACE_PTHREAD_SIGMASK=1 fi ]) AC_SUBST([LIB_PTHREAD_SIGMASK]) dnl We don't need a variable LTLIB_PTHREAD_SIGMASK, because when dnl "$gl_threads_api" = posix, $LTLIBMULTITHREAD and $LIBMULTITHREAD are the dnl same. dnl Now test for some bugs in the system function. if test $HAVE_PTHREAD_SIGMASK = 1; then AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles dnl On FreeBSD 6.4, HP-UX 11.31, Solaris 9, in programs that are not linked dnl with -lpthread, the pthread_sigmask() function always returns 0 and has dnl no effect. if test -z "$LIB_PTHREAD_SIGMASK"; then case " $LIBS " in *' -pthread '*) ;; *' -lpthread '*) ;; *) AC_CACHE_CHECK([whether pthread_sigmask works without -lpthread], [gl_cv_func_pthread_sigmask_in_libc_works], [ AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <pthread.h> #include <signal.h> #include <stddef.h> int main () { sigset_t set; sigemptyset (&set); return pthread_sigmask (1729, &set, NULL) != 0; }]])], [gl_cv_func_pthread_sigmask_in_libc_works=no], [gl_cv_func_pthread_sigmask_in_libc_works=yes], [ changequote(,)dnl case "$host_os" in freebsd* | hpux* | solaris | solaris2.[2-9]*) gl_cv_func_pthread_sigmask_in_libc_works="guessing no";; *) gl_cv_func_pthread_sigmask_in_libc_works="guessing yes";; esac changequote([,])dnl ]) ]) case "$gl_cv_func_pthread_sigmask_in_libc_works" in *no) REPLACE_PTHREAD_SIGMASK=1 AC_DEFINE([PTHREAD_SIGMASK_INEFFECTIVE], [1], [Define to 1 if pthread_sigmask may return 0 and have no effect.]) ;; esac;; esac fi dnl On Cygwin 1.7.5, the pthread_sigmask() has a wrong return value dnl convention: Upon failure, it returns -1 and sets errno. AC_CACHE_CHECK([whether pthread_sigmask returns error numbers], [gl_cv_func_pthread_sigmask_return_works], [ gl_save_LIBS="$LIBS" LIBS="$LIBS $LIB_PTHREAD_SIGMASK" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <pthread.h> #include <signal.h> #include <stddef.h> int main () { sigset_t set; sigemptyset (&set); if (pthread_sigmask (1729, &set, NULL) == -1) return 1; return 0; }]])], [gl_cv_func_pthread_sigmask_return_works=yes], [gl_cv_func_pthread_sigmask_return_works=no], [case "$host_os" in cygwin*) gl_cv_func_pthread_sigmask_return_works="guessing no";; *) gl_cv_func_pthread_sigmask_return_works="guessing yes";; esac ]) LIBS="$gl_save_LIBS" ]) case "$gl_cv_func_pthread_sigmask_return_works" in *no) REPLACE_PTHREAD_SIGMASK=1 AC_DEFINE([PTHREAD_SIGMASK_FAILS_WITH_ERRNO], [1], [Define to 1 if pthread_sigmask(), when it fails, returns -1 and sets errno.]) ;; esac dnl On IRIX 6.5, in a single-threaded program, pending signals are not dnl immediately delivered when they are unblocked through pthread_sigmask, dnl only a little while later. AC_CACHE_CHECK([whether pthread_sigmask unblocks signals correctly], [gl_cv_func_pthread_sigmask_unblock_works], [ case "$host_os" in irix*) gl_cv_func_pthread_sigmask_unblock_works="guessing no";; *) gl_cv_func_pthread_sigmask_unblock_works="guessing yes";; esac m4_ifdef([gl_][THREADLIB], [dnl Link against $LIBMULTITHREAD, not only $LIB_PTHREAD_SIGMASK. dnl Otherwise we get a false positive on those platforms where dnl $gl_cv_func_pthread_sigmask_in_libc_works is "no". gl_save_LIBS=$LIBS LIBS="$LIBS $LIBMULTITHREAD"]) AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <pthread.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> static volatile int sigint_occurred; static void sigint_handler (int sig) { sigint_occurred++; } int main () { sigset_t set; int pid = getpid (); char command[80]; signal (SIGINT, sigint_handler); sigemptyset (&set); sigaddset (&set, SIGINT); if (!(pthread_sigmask (SIG_BLOCK, &set, NULL) == 0)) return 1; sprintf (command, "sh -c 'sleep 1; kill -%d %d' &", SIGINT, pid); if (!(system (command) == 0)) return 2; sleep (2); if (!(sigint_occurred == 0)) return 3; if (!(pthread_sigmask (SIG_UNBLOCK, &set, NULL) == 0)) return 4; if (!(sigint_occurred == 1)) /* This fails on IRIX. */ return 5; return 0; }]])], [:], [gl_cv_func_pthread_sigmask_unblock_works=no], [:]) m4_ifdef([gl_][THREADLIB], [LIBS=$gl_save_LIBS]) ]) case "$gl_cv_func_pthread_sigmask_unblock_works" in *no) REPLACE_PTHREAD_SIGMASK=1 AC_DEFINE([PTHREAD_SIGMASK_UNBLOCK_BUG], [1], [Define to 1 if pthread_sigmask() unblocks signals incorrectly.]) ;; esac fi ]) # Prerequisite of lib/pthread_sigmask.c. AC_DEFUN([gl_PREREQ_PTHREAD_SIGMASK], [ if test $HAVE_PTHREAD_SIGMASK = 1; then AC_DEFINE([HAVE_PTHREAD_SIGMASK], [1], [Define to 1 if the pthread_sigmask function can be used (despite bugs).]) fi ])