103 lines
4.5 KiB
Plaintext
103 lines
4.5 KiB
Plaintext
# checkpthread.m4 -*- Autoconf -*-
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#==============================================================================
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# Copyright (C)2003-2005 by Eric Sunshine <sunshine@sunshineco.com>
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#
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# This library is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Library General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This library is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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# License for more details.
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#
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# You should have received a copy of the GNU Library General Public License
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# along with this library; if not, write to the Free Software Foundation,
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# Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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#==============================================================================
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AC_PREREQ([2.56])
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#------------------------------------------------------------------------------
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# CS_CHECK_PTHREAD([REJECT-MASK])
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# Check for pthread. Also check if the pthread implementation supports
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# the recursive and timed mutex extensions. (Timed mutexes are needed for
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# the NPTL: New Posix Thread Library on GNU/Linux if the mutex is going
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# to be used with any of the timed condition-wait functions.) The shell
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# variable cs_cv_sys_pthread is set to "yes" if pthread is available,
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# else "no". If available, then the variables cs_cv_sys_pthread_cflags,
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# cs_cv_sys_pthread_lflags, and cs_cv_sys_pthread_libs are set. (As a
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# convenience, these variables can be emitted to an output file with
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# CS_EMIT_BUILD_RESULT() by passing "cs_cv_sys_pthread" as its CACHE-VAR
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# argument.) If the recursive mutex extension is supported, then
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# cs_cv_sys_pthread_mutex_recursive will be set with the literal name of
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# the constant which must be passed to pthread_mutexattr_settype() to
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# enable this feature. The constant name will be typically
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# PTHREAD_MUTEX_RECURSIVE or PTHREAD_MUTEX_RECURSIVE_NP. If the recursive
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# mutex extension is not available, then
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# cs_cv_sys_pthread_mutex_recursive will be set to "no". If the timed
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# mutex extension is supported, then cs_cv_sys_pthread_mutex_timed will
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# be set with the literal name of the constant which must be passed to
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# pthread_mutexattr_settype() to enable this feature. The constant name
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# will be typically PTHREAD_MUTEX_TIMED or PTHREAD_MUTEX_TIMED_NP. If the
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# timed mutex extension is not available, then
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# cs_cv_sys_pthread_mutex_timed will be set to "no". REJECT-MASK can be
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# used to limit the platforms on which the pthread test is performed. It
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# is compared against $host_os; matches are rejected. If omitted, then
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# the test is performed on all platforms. Examples: To avoid testing on
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# Cygwin, use "cygwin*"; to avoid testing on Cygwin and AIX, use
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# "cygwin*|aix*".
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#------------------------------------------------------------------------------
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AC_DEFUN([CS_CHECK_PTHREAD],
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[AC_REQUIRE([AC_CANONICAL_HOST])
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case $host_os in
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m4_ifval([$1],
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[$1)
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cs_cv_sys_pthread=no
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;;
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])
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*)
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CS_CHECK_BUILD([for pthread], [cs_cv_sys_pthread],
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[AC_LANG_PROGRAM(
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[[#include <pthread.h>
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#include <semaphore.h>
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void* worker(void* p) { (void)p; return p; }]],
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[pthread_t tid;
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sem_t sem;
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pthread_create(&tid, 0, worker, 0);
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sem_init(&sem, 0, 0);
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sem_destroy(&sem);])],
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[cs_pthread_flags])
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;;
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esac
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_CS_CHECK_MUTEX_FEATURE([PTHREAD_MUTEX_RECURSIVE],
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[cs_cv_sys_pthread_mutex_recursive], [for pthread recursive mutexes])])
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# _CS_CHECK_MUTEX_FEATURE(FEATURE, CACHE-VAR, MESSAGE)
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AC_DEFUN([_CS_CHECK_MUTEX_FEATURE],
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[AS_IF([test $cs_cv_sys_pthread = yes],
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[AC_CACHE_CHECK([$3], [$2],
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[CS_BUILD_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <pthread.h>]],
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[pthread_mutexattr_t attr;
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pthread_mutexattr_settype(&attr, CS_MUTEX_FEATURE);])],
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[CS_CREATE_TUPLE([-DCS_MUTEX_FEATURE=$1]) \
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CS_CREATE_TUPLE([-DCS_MUTEX_FEATURE=$1_NP])],
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[],
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[$2=`echo $cs_build_cflags | sed 's/.*\($1_*N*P*\).*/\1/'`],
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[$2=no],
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[$cs_cv_sys_pthread_cflags -D_GNU_SOURCE],
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[$cs_cv_sys_pthread_lflags],
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[$cs_cv_sys_pthread_libs])])],
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[$2=no])])
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m4_define([cs_pthread_flags],
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[CS_CREATE_TUPLE() \
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CS_CREATE_TUPLE([], [], [-lpthread]) \
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CS_CREATE_TUPLE([], [], [-lpthread -lrt]) \
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CS_CREATE_TUPLE([-pthread], [-pthread], []) \
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CS_CREATE_TUPLE([-pthread], [-pthread], [-lpthread]) \
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CS_CREATE_TUPLE([-pthread], [-pthread], [-lc_r])])
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