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-rw-r--r--macros/texinfo/texinfo/gnulib/m4/threadlib.m4535
1 files changed, 399 insertions, 136 deletions
diff --git a/macros/texinfo/texinfo/gnulib/m4/threadlib.m4 b/macros/texinfo/texinfo/gnulib/m4/threadlib.m4
index 045d9dad29..8fc3dfd1fc 100644
--- a/macros/texinfo/texinfo/gnulib/m4/threadlib.m4
+++ b/macros/texinfo/texinfo/gnulib/m4/threadlib.m4
@@ -1,5 +1,5 @@
-# threadlib.m4 serial 20
-dnl Copyright (C) 2005-2019 Free Software Foundation, Inc.
+# threadlib.m4 serial 30
+dnl Copyright (C) 2005-2021 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.
@@ -8,6 +8,344 @@ dnl From Bruno Haible.
AC_PREREQ([2.60])
+dnl The general structure of the multithreading modules in gnulib is that we
+dnl have three set of modules:
+dnl
+dnl * POSIX API:
+dnl pthread, which combines
+dnl pthread-h
+dnl pthread-thread
+dnl pthread-once
+dnl pthread-mutex
+dnl pthread-rwlock
+dnl pthread-cond
+dnl pthread-tss
+dnl pthread-spin
+dnl sched_yield
+dnl
+dnl * ISO C API:
+dnl threads, which combines
+dnl threads-h
+dnl thrd
+dnl mtx
+dnl cnd
+dnl tss
+dnl
+dnl * Gnulib API, with an implementation that can be chosen at configure
+dnl time through the option --enable-threads=...
+dnl thread
+dnl lock
+dnl cond
+dnl tls
+dnl yield
+dnl
+dnl They are independent, except for the fact that
+dnl - the implementation of the ISO C API may use the POSIX (or some other
+dnl platform dependent) API,
+dnl - the implementation of the Gnulib API may use the POSIX or ISO C or
+dnl some other platform dependent API, depending on the --enable-threads
+dnl option.
+dnl
+dnl This file contains macros for all of these APIs!
+
+dnl ============================================================================
+dnl Macros for all thread APIs
+
+AC_DEFUN([gl_ANYTHREADLIB_EARLY],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ if test -z "$gl_anythreadlib_early_done"; then
+ case "$host_os" in
+ osf*)
+ # On OSF/1, the compiler needs the flag -D_REENTRANT so that it
+ # groks <pthread.h>. cc also understands the flag -pthread, but
+ # we don't use it because 1. gcc-2.95 doesn't understand -pthread,
+ # 2. putting a flag into CPPFLAGS that has an effect on the linker
+ # causes the AC_LINK_IFELSE test below to succeed unexpectedly,
+ # leading to wrong values of LIBTHREAD and LTLIBTHREAD.
+ CPPFLAGS="$CPPFLAGS -D_REENTRANT"
+ ;;
+ esac
+ # Some systems optimize for single-threaded programs by default, and
+ # need special flags to disable these optimizations. For example, the
+ # definition of 'errno' in <errno.h>.
+ case "$host_os" in
+ aix* | freebsd*) CPPFLAGS="$CPPFLAGS -D_THREAD_SAFE" ;;
+ solaris*) CPPFLAGS="$CPPFLAGS -D_REENTRANT" ;;
+ esac
+ gl_anythreadlib_early_done=done
+ fi
+])
+
+dnl Checks whether the compiler and linker support weak declarations of symbols.
+
+AC_DEFUN([gl_WEAK_SYMBOLS],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_CACHE_CHECK([whether imported symbols can be declared weak],
+ [gl_cv_have_weak],
+ [gl_cv_have_weak=no
+ dnl First, test whether the compiler accepts it syntactically.
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[extern void xyzzy ();
+#pragma weak xyzzy]],
+ [[xyzzy();]])],
+ [gl_cv_have_weak=maybe])
+ if test $gl_cv_have_weak = maybe; then
+ dnl Second, test whether it actually works. On Cygwin 1.7.2, with
+ dnl gcc 4.3, symbols declared weak always evaluate to the address 0.
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+#include <stdio.h>
+#pragma weak fputs
+int main ()
+{
+ return (fputs == NULL);
+}]])],
+ [gl_cv_have_weak=yes],
+ [gl_cv_have_weak=no],
+ [dnl When cross-compiling, assume that only ELF platforms support
+ dnl weak symbols.
+ AC_EGREP_CPP([Extensible Linking Format],
+ [#ifdef __ELF__
+ Extensible Linking Format
+ #endif
+ ],
+ [gl_cv_have_weak="guessing yes"],
+ [gl_cv_have_weak="guessing no"])
+ ])
+ fi
+ dnl But when linking statically, weak symbols don't work.
+ case " $LDFLAGS " in
+ *" -static "*) gl_cv_have_weak=no ;;
+ esac
+ dnl Test for a bug in FreeBSD 11: A link error occurs when using a weak
+ dnl symbol and linking against a shared library that has a dependency on
+ dnl the shared library that defines the symbol.
+ case "$gl_cv_have_weak" in
+ *yes)
+ case "$host_os" in
+ freebsd* | dragonfly* | midnightbsd*)
+ : > conftest1.c
+ $CC $CPPFLAGS $CFLAGS $LDFLAGS -fPIC -shared -o libempty.so conftest1.c -lpthread >&AS_MESSAGE_LOG_FD 2>&1
+ cat <<EOF > conftest2.c
+#include <pthread.h>
+#pragma weak pthread_mutexattr_gettype
+int main ()
+{
+ return (pthread_mutexattr_gettype != NULL);
+}
+EOF
+ $CC $CPPFLAGS $CFLAGS $LDFLAGS -o conftest conftest2.c libempty.so >&AS_MESSAGE_LOG_FD 2>&1 \
+ || gl_cv_have_weak=no
+ rm -f conftest1.c libempty.so conftest2.c conftest
+ ;;
+ esac
+ ;;
+ esac
+ ])
+ case "$gl_cv_have_weak" in
+ *yes)
+ AC_DEFINE([HAVE_WEAK_SYMBOLS], [1],
+ [Define to 1 if the compiler and linker support weak declarations of symbols.])
+ ;;
+ esac
+])
+
+dnl ============================================================================
+dnl Macros for the POSIX API
+
+dnl gl_PTHREADLIB
+dnl -------------
+dnl Tests for the libraries needs for using the POSIX threads API.
+dnl Sets the variable LIBPTHREAD to the linker options for use in a Makefile.
+dnl Sets the variable LIBPMULTITHREAD, for programs that really need
+dnl multithread functionality. The difference between LIBPTHREAD and
+dnl LIBPMULTITHREAD is that on platforms supporting weak symbols, typically
+dnl LIBPTHREAD is empty whereas LIBPMULTITHREAD is not.
+dnl Sets the variable LIB_SCHED_YIELD to the linker options needed to use the
+dnl sched_yield() function.
+dnl Adds to CPPFLAGS the flag -D_REENTRANT or -D_THREAD_SAFE if needed for
+dnl multithread-safe programs.
+dnl Defines the C macro HAVE_PTHREAD_API if (at least parts of) the POSIX
+dnl threads API is available.
+
+dnl The guts of gl_PTHREADLIB. Needs to be expanded only once.
+
+AC_DEFUN([gl_PTHREADLIB_BODY],
+[
+ AC_REQUIRE([gl_ANYTHREADLIB_EARLY])
+ if test -z "$gl_pthreadlib_body_done"; then
+ gl_pthread_api=no
+ LIBPTHREAD=
+ LIBPMULTITHREAD=
+ # On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that
+ # it groks <pthread.h>. It's added above, in gl_ANYTHREADLIB_EARLY.
+ AC_CHECK_HEADER([pthread.h],
+ [gl_have_pthread_h=yes], [gl_have_pthread_h=no])
+ if test "$gl_have_pthread_h" = yes; then
+ # Other possible tests:
+ # -lpthreads (FSU threads, PCthreads)
+ # -lgthreads
+ # Test whether both pthread_mutex_lock and pthread_mutexattr_init exist
+ # in libc. IRIX 6.5 has the first one in both libc and libpthread, but
+ # the second one only in libpthread, and lock.c needs it.
+ #
+ # If -pthread works, prefer it to -lpthread, since Ubuntu 14.04
+ # needs -pthread for some reason. See:
+ # https://lists.gnu.org/r/bug-gnulib/2014-09/msg00023.html
+ save_LIBS=$LIBS
+ for gl_pthread in '' '-pthread'; do
+ LIBS="$LIBS $gl_pthread"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <pthread.h>
+ pthread_mutex_t m;
+ pthread_mutexattr_t ma;
+ ]],
+ [[pthread_mutex_lock (&m);
+ pthread_mutexattr_init (&ma);]])],
+ [gl_pthread_api=yes
+ LIBPTHREAD=$gl_pthread
+ LIBPMULTITHREAD=$gl_pthread])
+ LIBS=$save_LIBS
+ test $gl_pthread_api = yes && break
+ done
+
+ # Test for libpthread by looking for pthread_kill. (Not pthread_self,
+ # since it is defined as a macro on OSF/1.)
+ if test $gl_pthread_api = yes && test -z "$LIBPTHREAD"; then
+ # The program links fine without libpthread. But it may actually
+ # need to link with libpthread in order to create multiple threads.
+ AC_CHECK_LIB([pthread], [pthread_kill],
+ [LIBPMULTITHREAD=-lpthread
+ # On Solaris and HP-UX, most pthread functions exist also in libc.
+ # Therefore pthread_in_use() needs to actually try to create a
+ # thread: pthread_create from libc will fail, whereas
+ # pthread_create will actually create a thread.
+ # On Solaris 10 or newer, this test is no longer needed, because
+ # libc contains the fully functional pthread functions.
+ case "$host_os" in
+ solaris | solaris2.[1-9] | solaris2.[1-9].* | hpux*)
+ AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1],
+ [Define if the pthread_in_use() detection is hard.])
+ esac
+ ])
+ elif test $gl_pthread_api != yes; then
+ # Some library is needed. Try libpthread and libc_r.
+ AC_CHECK_LIB([pthread], [pthread_kill],
+ [gl_pthread_api=yes
+ LIBPTHREAD=-lpthread
+ LIBPMULTITHREAD=-lpthread])
+ if test $gl_pthread_api != yes; then
+ # For FreeBSD 4.
+ AC_CHECK_LIB([c_r], [pthread_kill],
+ [gl_pthread_api=yes
+ LIBPTHREAD=-lc_r
+ LIBPMULTITHREAD=-lc_r])
+ fi
+ fi
+ fi
+ AC_MSG_CHECKING([whether POSIX threads API is available])
+ AC_MSG_RESULT([$gl_pthread_api])
+ AC_SUBST([LIBPTHREAD])
+ AC_SUBST([LIBPMULTITHREAD])
+ if test $gl_pthread_api = yes; then
+ AC_DEFINE([HAVE_PTHREAD_API], [1],
+ [Define if you have the <pthread.h> header and the POSIX threads API.])
+ fi
+
+ dnl On some systems, sched_yield is in librt, rather than in libpthread.
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sched.h>]],
+ [[sched_yield ();]])],
+ [LIB_SCHED_YIELD=
+ ],
+ [dnl Solaris 7...10 has sched_yield in librt, not in libpthread or libc.
+ AC_CHECK_LIB([rt], [sched_yield], [LIB_SCHED_YIELD=-lrt],
+ [dnl Solaris 2.5.1, 2.6 has sched_yield in libposix4, not librt.
+ AC_CHECK_LIB([posix4], [sched_yield], [LIB_SCHED_YIELD=-lposix4])])
+ ])
+ AC_SUBST([LIB_SCHED_YIELD])
+
+ gl_pthreadlib_body_done=done
+ fi
+])
+
+AC_DEFUN([gl_PTHREADLIB],
+[
+ AC_REQUIRE([gl_ANYTHREADLIB_EARLY])
+ gl_PTHREADLIB_BODY
+])
+
+dnl ============================================================================
+dnl Macros for the ISO C API
+
+dnl gl_STDTHREADLIB
+dnl ---------------
+dnl Tests for the libraries needs for using the ISO C threads API.
+dnl Sets the variable LIBSTDTHREAD to the linker options for use in a Makefile.
+dnl Adds to CPPFLAGS the flag -D_REENTRANT or -D_THREAD_SAFE if needed for
+dnl multithread-safe programs.
+dnl Defines the C macro HAVE_THREADS_H if (at least parts of) the ISO C threads
+dnl API is available.
+
+dnl The guts of gl_STDTHREADLIB. Needs to be expanded only once.
+
+AC_DEFUN([gl_STDTHREADLIB_BODY],
+[
+ AC_REQUIRE([gl_ANYTHREADLIB_EARLY])
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ if test -z "$gl_stdthreadlib_body_done"; then
+ AC_CHECK_HEADERS_ONCE([threads.h])
+
+ case "$host_os" in
+ mingw*)
+ LIBSTDTHREAD=
+ ;;
+ *)
+ gl_PTHREADLIB_BODY
+ if test $ac_cv_header_threads_h = yes; then
+ dnl glibc >= 2.29 has thrd_create in libpthread.
+ dnl FreeBSD >= 10 has thrd_create in libstdthreads; this library depends
+ dnl on libpthread (for the symbol 'pthread_mutexattr_gettype').
+ dnl AIX >= 7.1 and Solaris >= 11.4 have thrd_create in libc.
+ AC_CHECK_FUNCS([thrd_create])
+ if test $ac_cv_func_thrd_create = yes; then
+ LIBSTDTHREAD=
+ else
+ AC_CHECK_LIB([stdthreads], [thrd_create], [
+ LIBSTDTHREAD='-lstdthreads -lpthread'
+ ], [
+ dnl Guess that thrd_create is in libpthread.
+ LIBSTDTHREAD="$LIBPMULTITHREAD"
+ ])
+ fi
+ else
+ dnl Libraries needed by thrd.c, mtx.c, cnd.c, tss.c.
+ LIBSTDTHREAD="$LIBPMULTITHREAD $LIB_SCHED_YIELD"
+ fi
+ ;;
+ esac
+ AC_SUBST([LIBSTDTHREAD])
+
+ AC_MSG_CHECKING([whether ISO C threads API is available])
+ AC_MSG_RESULT([$ac_cv_header_threads_h])
+ gl_stdthreadlib_body_done=done
+ fi
+])
+
+AC_DEFUN([gl_STDTHREADLIB],
+[
+ AC_REQUIRE([gl_ANYTHREADLIB_EARLY])
+ gl_STDTHREADLIB_BODY
+])
+
+dnl ============================================================================
+dnl Macros for the Gnulib API
+
dnl gl_THREADLIB
dnl ------------
dnl Tests for a multithreading library to be used.
@@ -16,7 +354,13 @@ dnl (it must be placed before the invocation of gl_THREADLIB_EARLY!), then the
dnl default is 'no', otherwise it is system dependent. In both cases, the user
dnl can change the choice through the options --enable-threads=choice or
dnl --disable-threads.
-dnl Defines at most one of the macros USE_POSIX_THREADS, USE_WINDOWS_THREADS.
+dnl Defines at most one of the macros USE_ISOC_THREADS, USE_POSIX_THREADS,
+dnl USE_ISOC_AND_POSIX_THREADS, USE_WINDOWS_THREADS.
+dnl The choice --enable-threads=isoc+posix is available only on platforms that
+dnl have both the ISO C and the POSIX threads APIs. It has the effect of using
+dnl the ISO C API for most things and the POSIX API only for creating and
+dnl controlling threads (because there is no equivalent to pthread_atfork in
+dnl the ISO C API).
dnl Sets the variables LIBTHREAD and LTLIBTHREAD to the linker options for use
dnl in a Makefile (LIBTHREAD for use without libtool, LTLIBTHREAD for use with
dnl libtool).
@@ -54,8 +398,8 @@ AC_DEFUN([gl_THREADLIB_EARLY_BODY],
[m4_divert_text([DEFAULTS], [gl_use_threads_default=])])
m4_divert_text([DEFAULTS], [gl_use_winpthreads_default=])
AC_ARG_ENABLE([threads],
-AC_HELP_STRING([--enable-threads={posix|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [
-AC_HELP_STRING([--disable-threads], [build without multithread safety])]),
+AS_HELP_STRING([--enable-threads={isoc|posix|isoc+posix|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [
+AS_HELP_STRING([--disable-threads], [build without multithread safety])]),
[gl_use_threads=$enableval],
[if test -n "$gl_use_threads_default"; then
gl_use_threads="$gl_use_threads_default"
@@ -88,26 +432,12 @@ changequote(,)dnl
changequote([,])dnl
fi
])
- if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
- # For using <pthread.h>:
- case "$host_os" in
- osf*)
- # On OSF/1, the compiler needs the flag -D_REENTRANT so that it
- # groks <pthread.h>. cc also understands the flag -pthread, but
- # we don't use it because 1. gcc-2.95 doesn't understand -pthread,
- # 2. putting a flag into CPPFLAGS that has an effect on the linker
- # causes the AC_LINK_IFELSE test below to succeed unexpectedly,
- # leading to wrong values of LIBTHREAD and LTLIBTHREAD.
- CPPFLAGS="$CPPFLAGS -D_REENTRANT"
- ;;
- esac
- # Some systems optimize for single-threaded programs by default, and
- # need special flags to disable these optimizations. For example, the
- # definition of 'errno' in <errno.h>.
- case "$host_os" in
- aix* | freebsd*) CPPFLAGS="$CPPFLAGS -D_THREAD_SAFE" ;;
- solaris*) CPPFLAGS="$CPPFLAGS -D_REENTRANT" ;;
- esac
+ if test "$gl_use_threads" = yes \
+ || test "$gl_use_threads" = isoc \
+ || test "$gl_use_threads" = posix \
+ || test "$gl_use_threads" = isoc+posix; then
+ # For using <threads.h> or <pthread.h>:
+ gl_ANYTHREADLIB_EARLY
fi
])
@@ -123,45 +453,7 @@ AC_DEFUN([gl_THREADLIB_BODY],
LTLIBMULTITHREAD=
if test "$gl_use_threads" != no; then
dnl Check whether the compiler and linker support weak declarations.
- AC_CACHE_CHECK([whether imported symbols can be declared weak],
- [gl_cv_have_weak],
- [gl_cv_have_weak=no
- dnl First, test whether the compiler accepts it syntactically.
- AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
- [[extern void xyzzy ();
-#pragma weak xyzzy]],
- [[xyzzy();]])],
- [gl_cv_have_weak=maybe])
- if test $gl_cv_have_weak = maybe; then
- dnl Second, test whether it actually works. On Cygwin 1.7.2, with
- dnl gcc 4.3, symbols declared weak always evaluate to the address 0.
- AC_RUN_IFELSE(
- [AC_LANG_SOURCE([[
-#include <stdio.h>
-#pragma weak fputs
-int main ()
-{
- return (fputs == NULL);
-}]])],
- [gl_cv_have_weak=yes],
- [gl_cv_have_weak=no],
- [dnl When cross-compiling, assume that only ELF platforms support
- dnl weak symbols.
- AC_EGREP_CPP([Extensible Linking Format],
- [#ifdef __ELF__
- Extensible Linking Format
- #endif
- ],
- [gl_cv_have_weak="guessing yes"],
- [gl_cv_have_weak="guessing no"])
- ])
- fi
- dnl But when linking statically, weak symbols don't work.
- case " $LDFLAGS " in
- *" -static "*) gl_cv_have_weak=no ;;
- esac
- ])
+ gl_WEAK_SYMBOLS
if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then
dnl If we use weak symbols to implement pthread_in_use / pth_in_use /
dnl thread_in_use, we also need to test whether the ISO C 11 thrd_create
@@ -169,75 +461,23 @@ int main ()
AC_CHECK_HEADERS_ONCE([threads.h])
:
fi
- if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
- # On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that
- # it groks <pthread.h>. It's added above, in gl_THREADLIB_EARLY_BODY.
- AC_CHECK_HEADER([pthread.h],
- [gl_have_pthread_h=yes], [gl_have_pthread_h=no])
- if test "$gl_have_pthread_h" = yes; then
- # Other possible tests:
- # -lpthreads (FSU threads, PCthreads)
- # -lgthreads
- gl_have_pthread=
- # Test whether both pthread_mutex_lock and pthread_mutexattr_init exist
- # in libc. IRIX 6.5 has the first one in both libc and libpthread, but
- # the second one only in libpthread, and lock.c needs it.
- #
- # If -pthread works, prefer it to -lpthread, since Ubuntu 14.04
- # needs -pthread for some reason. See:
- # https://lists.gnu.org/r/bug-gnulib/2014-09/msg00023.html
- save_LIBS=$LIBS
- for gl_pthread in '' '-pthread'; do
- LIBS="$LIBS $gl_pthread"
- AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <pthread.h>
- pthread_mutex_t m;
- pthread_mutexattr_t ma;
- ]],
- [[pthread_mutex_lock (&m);
- pthread_mutexattr_init (&ma);]])],
- [gl_have_pthread=yes
- LIBTHREAD=$gl_pthread LTLIBTHREAD=$gl_pthread
- LIBMULTITHREAD=$gl_pthread LTLIBMULTITHREAD=$gl_pthread])
- LIBS=$save_LIBS
- test -n "$gl_have_pthread" && break
- done
-
- # Test for libpthread by looking for pthread_kill. (Not pthread_self,
- # since it is defined as a macro on OSF/1.)
- if test -n "$gl_have_pthread" && test -z "$LIBTHREAD"; then
- # The program links fine without libpthread. But it may actually
- # need to link with libpthread in order to create multiple threads.
- AC_CHECK_LIB([pthread], [pthread_kill],
- [LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread
- # On Solaris and HP-UX, most pthread functions exist also in libc.
- # Therefore pthread_in_use() needs to actually try to create a
- # thread: pthread_create from libc will fail, whereas
- # pthread_create will actually create a thread.
- # On Solaris 10 or newer, this test is no longer needed, because
- # libc contains the fully functional pthread functions.
- case "$host_os" in
- solaris | solaris2.[1-9] | solaris2.[1-9].* | hpux*)
- AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1],
- [Define if the pthread_in_use() detection is hard.])
- esac
- ])
- elif test -z "$gl_have_pthread"; then
- # Some library is needed. Try libpthread and libc_r.
- AC_CHECK_LIB([pthread], [pthread_kill],
- [gl_have_pthread=yes
- LIBTHREAD=-lpthread LTLIBTHREAD=-lpthread
- LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread])
- if test -z "$gl_have_pthread"; then
- # For FreeBSD 4.
- AC_CHECK_LIB([c_r], [pthread_kill],
- [gl_have_pthread=yes
- LIBTHREAD=-lc_r LTLIBTHREAD=-lc_r
- LIBMULTITHREAD=-lc_r LTLIBMULTITHREAD=-lc_r])
- fi
- fi
- if test -n "$gl_have_pthread"; then
+ if test "$gl_use_threads" = isoc || test "$gl_use_threads" = isoc+posix; then
+ AC_CHECK_HEADERS_ONCE([threads.h])
+ gl_have_isoc_threads="$ac_cv_header_threads_h"
+ fi
+ if test "$gl_use_threads" = yes \
+ || test "$gl_use_threads" = posix \
+ || test "$gl_use_threads" = isoc+posix; then
+ gl_PTHREADLIB_BODY
+ LIBTHREAD=$LIBPTHREAD LTLIBTHREAD=$LIBPTHREAD
+ LIBMULTITHREAD=$LIBPMULTITHREAD LTLIBMULTITHREAD=$LIBPMULTITHREAD
+ if test $gl_pthread_api = yes; then
+ if test "$gl_use_threads" = isoc+posix && test "$gl_have_isoc_threads" = yes; then
+ gl_threads_api='isoc+posix'
+ AC_DEFINE([USE_ISOC_AND_POSIX_THREADS], [1],
+ [Define if the combination of the ISO C and POSIX multithreading APIs can be used.])
+ LIBTHREAD= LTLIBTHREAD=
+ else
gl_threads_api=posix
AC_DEFINE([USE_POSIX_THREADS], [1],
[Define if the POSIX multithreading library can be used.])
@@ -245,14 +485,34 @@ int main ()
if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then
AC_DEFINE([USE_POSIX_THREADS_WEAK], [1],
[Define if references to the POSIX multithreading library should be made weak.])
- LIBTHREAD=
- LTLIBTHREAD=
+ LIBTHREAD= LTLIBTHREAD=
+ else
+ case "$host_os" in
+ freebsd* | dragonfly* | midnightbsd*)
+ if test "x$LIBTHREAD" != "x$LIBMULTITHREAD"; then
+ dnl If weak symbols can't tell whether pthread_create(), pthread_key_create()
+ dnl etc. will succeed, we need a runtime test.
+ AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1],
+ [Define if the pthread_in_use() detection is hard.])
+ fi
+ ;;
+ esac
fi
fi
fi
fi
fi
- if test -z "$gl_have_pthread"; then
+ if test $gl_threads_api = none; then
+ if test "$gl_use_threads" = isoc && test "$gl_have_isoc_threads" = yes; then
+ gl_STDTHREADLIB_BODY
+ LIBTHREAD=$LIBSTDTHREAD LTLIBTHREAD=$LIBSTDTHREAD
+ LIBMULTITHREAD=$LIBSTDTHREAD LTLIBMULTITHREAD=$LIBSTDTHREAD
+ gl_threads_api=isoc
+ AC_DEFINE([USE_ISOC_THREADS], [1],
+ [Define if the ISO C multithreading library can be used.])
+ fi
+ fi
+ if test $gl_threads_api = none; then
case "$gl_use_threads" in
yes | windows | win32) # The 'win32' is for backward compatibility.
if { case "$host_os" in
@@ -306,6 +566,9 @@ AC_DEFUN([gl_AVOID_WINPTHREAD], [
])
+dnl ============================================================================
+
+
dnl Survey of platforms:
dnl
dnl Platform Available Compiler Supports test-lock