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# lock.m4 serial 2 (gettext-0.15)
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dnl Copyright (C) 2005 Free Software Foundation, Inc.
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# lock.m4 serial 6 (gettext-0.16)
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dnl Copyright (C) 2005-2006 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl Adds to CPPFLAGS the flag -D_REENTRANT or -D_THREAD_SAFE if needed for
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dnl multithread-safe programs.
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AC_DEFUN([gl_LOCK_EARLY],
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AC_REQUIRE([gl_LOCK_BODY])
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AC_REQUIRE([gl_LOCK_EARLY_BODY])
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dnl The guts of gl_LOCK. Needs to be expanded only once.
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dnl The guts of gl_LOCK_EARLY. Needs to be expanded only once.
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AC_DEFUN([gl_LOCK_BODY],
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AC_DEFUN([gl_LOCK_EARLY_BODY],
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dnl Ordering constraints: This macro modifies CPPFLAGS in a way that
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dnl influences the result of the autoconf tests that test for *_unlocked
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AC_ARG_ENABLE(threads,
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AC_HELP_STRING([--enable-threads={posix|solaris|pth|win32}], [specify multithreading API])
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AC_HELP_STRING([--disable-threads], [build without multithread safety]),
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gl_use_threads=$enableval, gl_use_threads=yes)
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[gl_use_threads=$enableval],
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dnl Disable multithreading by default on OSF/1, because it interferes
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dnl with fork()/exec(): When msgexec is linked with -lpthread, its child
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dnl process gets an endless segmentation fault inside execvp().
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osf*) gl_use_threads=no ;;
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*) gl_use_threads=yes ;;
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if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
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# For using <pthread.h>:
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# On OSF/1, the compiler needs the flag -D_REENTRANT so that it
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# groks <pthread.h>. cc also understands the flag -pthread, but
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# we don't use it because 1. gcc-2.95 doesn't understand -pthread,
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# 2. putting a flag into CPPFLAGS that has an effect on the linker
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# causes the AC_TRY_LINK test below to succeed unexpectedly,
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# leading to wrong values of LIBTHREAD and LTLIBTHREAD.
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CPPFLAGS="$CPPFLAGS -D_REENTRANT"
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# Some systems optimize for single-threaded programs by default, and
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# need special flags to disable these optimizations. For example, the
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# definition of 'errno' in <errno.h>.
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aix* | freebsd*) CPPFLAGS="$CPPFLAGS -D_THREAD_SAFE" ;;
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solaris*) CPPFLAGS="$CPPFLAGS -D_REENTRANT" ;;
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dnl The guts of gl_LOCK. Needs to be expanded only once.
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AC_DEFUN([gl_LOCK_BODY],
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AC_REQUIRE([gl_LOCK_EARLY_BODY])
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gl_threads_api=none
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AC_MSG_RESULT([$gl_have_weak])
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if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
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# On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that
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# it groks <pthread.h>.
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gl_save_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS="$CPPFLAGS -D_REENTRANT"
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# it groks <pthread.h>. It's added above, in gl_LOCK_EARLY_BODY.
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AC_CHECK_HEADER(pthread.h, gl_have_pthread_h=yes, gl_have_pthread_h=no)
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CPPFLAGS="$gl_save_CPPFLAGS"
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if test "$gl_have_pthread_h" = yes; then
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# Other possible tests:
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# -lpthreads (FSU threads, PCthreads)
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# On OSF/1, the compiler needs the flag -D_REENTRANT so that it
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# groks <pthread.h>. cc also understands the flag -pthread, but
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# we don't use it because 1. gcc-2.95 doesn't understand -pthread,
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# 2. putting a flag into CPPFLAGS that has an effect on the linker
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# causes the AC_TRY_LINK test below to succeed unexpectedly,
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# leading to wrong values of LIBTHREAD and LTLIBTHREAD.
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CPPFLAGS="$CPPFLAGS -D_REENTRANT"
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# Test whether both pthread_mutex_lock and pthread_mutexattr_init exist
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# in libc. IRIX 6.5 has the first one in both libc and libpthread, but
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error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
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int x = (int)PTHREAD_MUTEX_RECURSIVE;
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[AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], 1,
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[Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
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# Some systems optimize for single-threaded programs by default, and
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# need special flags to disable these optimizations. For example, the
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# definition of 'errno' in <errno.h>.
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aix* | freebsd*) CPPFLAGS="$CPPFLAGS -D_THREAD_SAFE" ;;
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solaris*) CPPFLAGS="$CPPFLAGS -D_REENTRANT" ;;
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m4/lock.m4
