mirror of https://github.com/aria2/aria2
317 lines
12 KiB
Plaintext
317 lines
12 KiB
Plaintext
# lock.m4 serial 7 (gettext-0.17)
|
|
dnl Copyright (C) 2005-2007 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 From Bruno Haible.
|
|
|
|
dnl Tests for a multithreading library to be used.
|
|
dnl Defines at most one of the macros USE_POSIX_THREADS, USE_SOLARIS_THREADS,
|
|
dnl USE_PTH_THREADS, USE_WIN32_THREADS
|
|
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).
|
|
dnl Sets the variables LIBMULTITHREAD and LTLIBMULTITHREAD similarly, for
|
|
dnl programs that really need multithread functionality. The difference
|
|
dnl between LIBTHREAD and LIBMULTITHREAD is that on platforms supporting weak
|
|
dnl symbols, typically LIBTHREAD="" whereas LIBMULTITHREAD="-lpthread".
|
|
dnl Adds to CPPFLAGS the flag -D_REENTRANT or -D_THREAD_SAFE if needed for
|
|
dnl multithread-safe programs.
|
|
|
|
AC_DEFUN([gl_LOCK_EARLY],
|
|
[
|
|
AC_REQUIRE([gl_LOCK_EARLY_BODY])
|
|
])
|
|
|
|
dnl The guts of gl_LOCK_EARLY. Needs to be expanded only once.
|
|
|
|
AC_DEFUN([gl_LOCK_EARLY_BODY],
|
|
[
|
|
dnl Ordering constraints: This macro modifies CPPFLAGS in a way that
|
|
dnl influences the result of the autoconf tests that test for *_unlocked
|
|
dnl declarations, on AIX 5 at least. Therefore it must come early.
|
|
AC_BEFORE([$0], [gl_FUNC_GLIBC_UNLOCKED_IO])dnl
|
|
AC_BEFORE([$0], [gl_ARGP])dnl
|
|
|
|
AC_REQUIRE([AC_CANONICAL_HOST])
|
|
dnl _GNU_SOURCE is needed for pthread_rwlock_t on glibc systems.
|
|
dnl AC_USE_SYSTEM_EXTENSIONS was introduced in autoconf 2.60 and obsoletes
|
|
dnl AC_GNU_SOURCE.
|
|
m4_ifdef([AC_USE_SYSTEM_EXTENSIONS],
|
|
[AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])],
|
|
[AC_REQUIRE([AC_GNU_SOURCE])])
|
|
dnl Check for multithreading.
|
|
AC_ARG_ENABLE(threads,
|
|
AC_HELP_STRING([--enable-threads={posix|solaris|pth|win32}], [specify multithreading API])
|
|
AC_HELP_STRING([--disable-threads], [build without multithread safety]),
|
|
[gl_use_threads=$enableval],
|
|
[case "$host_os" in
|
|
dnl Disable multithreading by default on OSF/1, because it interferes
|
|
dnl with fork()/exec(): When msgexec is linked with -lpthread, its child
|
|
dnl process gets an endless segmentation fault inside execvp().
|
|
osf*) gl_use_threads=no ;;
|
|
*) gl_use_threads=yes ;;
|
|
esac
|
|
])
|
|
if test "$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_TRY_LINK 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
|
|
fi
|
|
])
|
|
|
|
dnl The guts of gl_LOCK. Needs to be expanded only once.
|
|
|
|
AC_DEFUN([gl_LOCK_BODY],
|
|
[
|
|
AC_REQUIRE([gl_LOCK_EARLY_BODY])
|
|
gl_threads_api=none
|
|
LIBTHREAD=
|
|
LTLIBTHREAD=
|
|
LIBMULTITHREAD=
|
|
LTLIBMULTITHREAD=
|
|
if test "$gl_use_threads" != no; then
|
|
dnl Check whether the compiler and linker support weak declarations.
|
|
AC_MSG_CHECKING([whether imported symbols can be declared weak])
|
|
gl_have_weak=no
|
|
AC_TRY_LINK([extern void xyzzy ();
|
|
#pragma weak xyzzy], [xyzzy();], [gl_have_weak=yes])
|
|
AC_MSG_RESULT([$gl_have_weak])
|
|
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_LOCK_EARLY_BODY.
|
|
AC_CHECK_HEADER(pthread.h, gl_have_pthread_h=yes, gl_have_pthread_h=no)
|
|
if test "$gl_have_pthread_h" = yes; then
|
|
# Other possible tests:
|
|
# -lpthreads (FSU threads, PCthreads)
|
|
# -lgthreads
|
|
gl_have_pthread=
|
|
# Test whether both pthread_mutex_lock and pthread_mutexattr_init exist
|
|
# in libc. IRIX 6.5 has the first one in both libc and libpthread, but
|
|
# the second one only in libpthread, and lock.c needs it.
|
|
AC_TRY_LINK([#include <pthread.h>],
|
|
[pthread_mutex_lock((pthread_mutex_t*)0);
|
|
pthread_mutexattr_init((pthread_mutexattr_t*)0);],
|
|
[gl_have_pthread=yes])
|
|
# Test for libpthread by looking for pthread_kill. (Not pthread_self,
|
|
# since it is defined as a macro on OSF/1.)
|
|
if test -n "$gl_have_pthread"; 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.
|
|
case "$host_os" in
|
|
solaris* | hpux*)
|
|
AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], 1,
|
|
[Define if the pthread_in_use() detection is hard.])
|
|
esac
|
|
])
|
|
else
|
|
# Some library is needed. Try libpthread and libc_r.
|
|
AC_CHECK_LIB(pthread, pthread_kill,
|
|
[gl_have_pthread=yes
|
|
LIBTHREAD=-lpthread LTLIBTHREAD=-lpthread
|
|
LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread])
|
|
if test -z "$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 "$gl_have_pthread"; then
|
|
gl_threads_api=posix
|
|
AC_DEFINE([USE_POSIX_THREADS], 1,
|
|
[Define if the POSIX multithreading library can be used.])
|
|
if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
|
|
if test $gl_have_weak = yes; then
|
|
AC_DEFINE([USE_POSIX_THREADS_WEAK], 1,
|
|
[Define if references to the POSIX multithreading library should be made weak.])
|
|
LIBTHREAD=
|
|
LTLIBTHREAD=
|
|
fi
|
|
fi
|
|
# OSF/1 4.0 and MacOS X 10.1 lack the pthread_rwlock_t type and the
|
|
# pthread_rwlock_* functions.
|
|
AC_CHECK_TYPE([pthread_rwlock_t],
|
|
[AC_DEFINE([HAVE_PTHREAD_RWLOCK], 1,
|
|
[Define if the POSIX multithreading library has read/write locks.])],
|
|
[],
|
|
[#include <pthread.h>])
|
|
# glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.
|
|
AC_TRY_COMPILE([#include <pthread.h>],
|
|
[#if __FreeBSD__ == 4
|
|
error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
|
|
#else
|
|
int x = (int)PTHREAD_MUTEX_RECURSIVE;
|
|
return !x;
|
|
#endif],
|
|
[AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], 1,
|
|
[Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
|
|
fi
|
|
fi
|
|
fi
|
|
if test -z "$gl_have_pthread"; then
|
|
if test "$gl_use_threads" = yes || test "$gl_use_threads" = solaris; then
|
|
gl_have_solaristhread=
|
|
gl_save_LIBS="$LIBS"
|
|
LIBS="$LIBS -lthread"
|
|
AC_TRY_LINK([#include <thread.h>
|
|
#include <synch.h>],
|
|
[thr_self();],
|
|
[gl_have_solaristhread=yes])
|
|
LIBS="$gl_save_LIBS"
|
|
if test -n "$gl_have_solaristhread"; then
|
|
gl_threads_api=solaris
|
|
LIBTHREAD=-lthread
|
|
LTLIBTHREAD=-lthread
|
|
LIBMULTITHREAD="$LIBTHREAD"
|
|
LTLIBMULTITHREAD="$LTLIBTHREAD"
|
|
AC_DEFINE([USE_SOLARIS_THREADS], 1,
|
|
[Define if the old Solaris multithreading library can be used.])
|
|
if test $gl_have_weak = yes; then
|
|
AC_DEFINE([USE_SOLARIS_THREADS_WEAK], 1,
|
|
[Define if references to the old Solaris multithreading library should be made weak.])
|
|
LIBTHREAD=
|
|
LTLIBTHREAD=
|
|
fi
|
|
fi
|
|
fi
|
|
fi
|
|
if test "$gl_use_threads" = pth; then
|
|
gl_save_CPPFLAGS="$CPPFLAGS"
|
|
AC_LIB_LINKFLAGS(pth)
|
|
gl_have_pth=
|
|
gl_save_LIBS="$LIBS"
|
|
LIBS="$LIBS -lpth"
|
|
AC_TRY_LINK([#include <pth.h>], [pth_self();], gl_have_pth=yes)
|
|
LIBS="$gl_save_LIBS"
|
|
if test -n "$gl_have_pth"; then
|
|
gl_threads_api=pth
|
|
LIBTHREAD="$LIBPTH"
|
|
LTLIBTHREAD="$LTLIBPTH"
|
|
LIBMULTITHREAD="$LIBTHREAD"
|
|
LTLIBMULTITHREAD="$LTLIBTHREAD"
|
|
AC_DEFINE([USE_PTH_THREADS], 1,
|
|
[Define if the GNU Pth multithreading library can be used.])
|
|
if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
|
|
if test $gl_have_weak = yes; then
|
|
AC_DEFINE([USE_PTH_THREADS_WEAK], 1,
|
|
[Define if references to the GNU Pth multithreading library should be made weak.])
|
|
LIBTHREAD=
|
|
LTLIBTHREAD=
|
|
fi
|
|
fi
|
|
else
|
|
CPPFLAGS="$gl_save_CPPFLAGS"
|
|
fi
|
|
fi
|
|
if test -z "$gl_have_pthread"; then
|
|
if test "$gl_use_threads" = yes || test "$gl_use_threads" = win32; then
|
|
if { case "$host_os" in
|
|
mingw*) true;;
|
|
*) false;;
|
|
esac
|
|
}; then
|
|
gl_threads_api=win32
|
|
AC_DEFINE([USE_WIN32_THREADS], 1,
|
|
[Define if the Win32 multithreading API can be used.])
|
|
fi
|
|
fi
|
|
fi
|
|
fi
|
|
AC_MSG_CHECKING([for multithread API to use])
|
|
AC_MSG_RESULT([$gl_threads_api])
|
|
AC_SUBST(LIBTHREAD)
|
|
AC_SUBST(LTLIBTHREAD)
|
|
AC_SUBST(LIBMULTITHREAD)
|
|
AC_SUBST(LTLIBMULTITHREAD)
|
|
])
|
|
|
|
AC_DEFUN([gl_LOCK],
|
|
[
|
|
AC_REQUIRE([gl_LOCK_EARLY])
|
|
AC_REQUIRE([gl_LOCK_BODY])
|
|
gl_PREREQ_LOCK
|
|
])
|
|
|
|
# Prerequisites of lib/lock.c.
|
|
AC_DEFUN([gl_PREREQ_LOCK], [
|
|
AC_REQUIRE([AC_C_INLINE])
|
|
])
|
|
|
|
dnl Survey of platforms:
|
|
dnl
|
|
dnl Platform Available Compiler Supports test-lock
|
|
dnl flavours option weak result
|
|
dnl --------------- --------- --------- -------- ---------
|
|
dnl Linux 2.4/glibc posix -lpthread Y OK
|
|
dnl
|
|
dnl GNU Hurd/glibc posix
|
|
dnl
|
|
dnl FreeBSD 5.3 posix -lc_r Y
|
|
dnl posix -lkse ? Y
|
|
dnl posix -lpthread ? Y
|
|
dnl posix -lthr Y
|
|
dnl
|
|
dnl FreeBSD 5.2 posix -lc_r Y
|
|
dnl posix -lkse Y
|
|
dnl posix -lthr Y
|
|
dnl
|
|
dnl FreeBSD 4.0,4.10 posix -lc_r Y OK
|
|
dnl
|
|
dnl NetBSD 1.6 --
|
|
dnl
|
|
dnl OpenBSD 3.4 posix -lpthread Y OK
|
|
dnl
|
|
dnl MacOS X 10.[123] posix -lpthread Y OK
|
|
dnl
|
|
dnl Solaris 7,8,9 posix -lpthread Y Sol 7,8: 0.0; Sol 9: OK
|
|
dnl solaris -lthread Y Sol 7,8: 0.0; Sol 9: OK
|
|
dnl
|
|
dnl HP-UX 11 posix -lpthread N (cc) OK
|
|
dnl Y (gcc)
|
|
dnl
|
|
dnl IRIX 6.5 posix -lpthread Y 0.5
|
|
dnl
|
|
dnl AIX 4.3,5.1 posix -lpthread N AIX 4: 0.5; AIX 5: OK
|
|
dnl
|
|
dnl OSF/1 4.0,5.1 posix -pthread (cc) N OK
|
|
dnl -lpthread (gcc) Y
|
|
dnl
|
|
dnl Cygwin posix -lpthread Y OK
|
|
dnl
|
|
dnl Any of the above pth -lpth 0.0
|
|
dnl
|
|
dnl Mingw win32 N OK
|
|
dnl
|
|
dnl BeOS 5 --
|
|
dnl
|
|
dnl The test-lock result shows what happens if in test-lock.c EXPLICIT_YIELD is
|
|
dnl turned off:
|
|
dnl OK if all three tests terminate OK,
|
|
dnl 0.5 if the first test terminates OK but the second one loops endlessly,
|
|
dnl 0.0 if the first test already loops endlessly.
|