mutex.ac

这是国外的resip协议栈

# $Id: mutex.ac,v 11.46 2004/07/09 16:23:19 bostic Exp $

# POSIX pthreads tests: inter-process safe and intra-process only.
AC_DEFUN(AM_PTHREADS_SHARED, [
AC_TRY_RUN([
#include <pthread.h>
main() {
	pthread_cond_t cond;
	pthread_mutex_t mutex;
	pthread_condattr_t condattr;
	pthread_mutexattr_t mutexattr;
	exit (
	pthread_condattr_init(&condattr) ||
	pthread_condattr_setpshared(&condattr, PTHREAD_PROCESS_SHARED) ||
	pthread_mutexattr_init(&mutexattr) ||
	pthread_mutexattr_setpshared(&mutexattr, PTHREAD_PROCESS_SHARED) ||
	pthread_cond_init(&cond, &condattr) ||
	pthread_mutex_init(&mutex, &mutexattr) ||
	pthread_mutex_lock(&mutex) ||
	pthread_mutex_unlock(&mutex) ||
	pthread_mutex_destroy(&mutex) ||
	pthread_cond_destroy(&cond) ||
	pthread_condattr_destroy(&condattr) ||
	pthread_mutexattr_destroy(&mutexattr));
}], [db_cv_mutex="$1"],,
AC_TRY_LINK([
#include <pthread.h>],[
	pthread_cond_t cond;
	pthread_mutex_t mutex;
	pthread_condattr_t condattr;
	pthread_mutexattr_t mutexattr;
	exit (
	pthread_condattr_init(&condattr) ||
	pthread_condattr_setpshared(&condattr, PTHREAD_PROCESS_SHARED) ||
	pthread_mutexattr_init(&mutexattr) ||
	pthread_mutexattr_setpshared(&mutexattr, PTHREAD_PROCESS_SHARED) ||
	pthread_cond_init(&cond, &condattr) ||
	pthread_mutex_init(&mutex, &mutexattr) ||
	pthread_mutex_lock(&mutex) ||
	pthread_mutex_unlock(&mutex) ||
	pthread_mutex_destroy(&mutex) ||
	pthread_cond_destroy(&cond) ||
	pthread_condattr_destroy(&condattr) ||
	pthread_mutexattr_destroy(&mutexattr));
], [db_cv_mutex="$1"]))])
AC_DEFUN(AM_PTHREADS_PRIVATE, [
AC_TRY_RUN([
#include <pthread.h>
main() {
	pthread_cond_t cond;
	pthread_mutex_t mutex;
	pthread_condattr_t condattr;
	pthread_mutexattr_t mutexattr;
	exit (
	pthread_condattr_init(&condattr) ||
	pthread_mutexattr_init(&mutexattr) ||
	pthread_cond_init(&cond, &condattr) ||
	pthread_mutex_init(&mutex, &mutexattr) ||
	pthread_mutex_lock(&mutex) ||
	pthread_mutex_unlock(&mutex) ||
	pthread_mutex_destroy(&mutex) ||
	pthread_cond_destroy(&cond) ||
	pthread_condattr_destroy(&condattr) ||
	pthread_mutexattr_destroy(&mutexattr));
}], [db_cv_mutex="$1"],,
AC_TRY_LINK([
#include <pthread.h>],[
	pthread_cond_t cond;
	pthread_mutex_t mutex;
	pthread_condattr_t condattr;
	pthread_mutexattr_t mutexattr;
	exit (
	pthread_condattr_init(&condattr) ||
	pthread_mutexattr_init(&mutexattr) ||
	pthread_cond_init(&cond, &condattr) ||
	pthread_mutex_init(&mutex, &mutexattr) ||
	pthread_mutex_lock(&mutex) ||
	pthread_mutex_unlock(&mutex) ||
	pthread_mutex_destroy(&mutex) ||
	pthread_cond_destroy(&cond) ||
	pthread_condattr_destroy(&condattr) ||
	pthread_mutexattr_destroy(&mutexattr));
], [db_cv_mutex="$1"]))])

# Figure out mutexes for this compiler/architecture.
AC_DEFUN(AM_DEFINE_MUTEXES, [

# Mutexes we don't test for, but want the #defines to exist for
# other ports.
AH_TEMPLATE(HAVE_MUTEX_VMS, [Define to 1 to use VMS mutexes.])
AH_TEMPLATE(HAVE_MUTEX_VXWORKS, [Define to 1 to use VxWorks mutexes.])

AC_CACHE_CHECK([for mutexes], db_cv_mutex, [
db_cv_mutex=no

orig_libs=$LIBS

# User-specified POSIX or UI mutexes.
#
# There are two different reasons to specify mutexes: First, the application
# is already using one type of mutex and doesn't want to mix-and-match (for
# example, on Solaris, which has POSIX, UI and LWP mutexes).  Second, the
# applications POSIX pthreads mutexes don't support inter-process locking,
# but the application wants to use them anyway (for example, some Linux and
# *BSD systems).
#
# Test for LWP threads before testing for UI/POSIX threads, we prefer them
# on Solaris.  There's a bug in SunOS 5.7 where applications get pwrite, not
# pwrite64, if they load the C library before the appropriate threads library,
# e.g., tclsh using dlopen to load the DB library.  By using LWP threads we
# avoid answering lots of user questions, not to mention the bugs.
#
# Otherwise, test for POSIX threads before UI threads.  There are Linux systems
# that support a UI compatibility mode, and applications are more likely to be
# written for POSIX threads than UI threads.
#
# Try and link with a threads library if possible.  The problem is the Solaris
# C library has UI/POSIX interface stubs, but they're broken, configuring them
# for inter-process mutexes doesn't return an error, but it doesn't work either.
if test "$db_cv_posixmutexes" = yes; then
	db_cv_mutex="posix_only";
fi
if test "$db_cv_uimutexes" = yes; then
	db_cv_mutex="ui_only";
fi

# User-specified Win32 mutexes (MinGW build)
if test "$db_cv_mingw" = "yes"; then
	db_cv_mutex=win32/gcc
fi

# LWP threads: _lwp_XXX
if test "$db_cv_mutex" = no; then
AC_TRY_LINK([
#include <synch.h>],[
	static lwp_mutex_t mi = SHAREDMUTEX;
	static lwp_cond_t ci = SHAREDCV;
	lwp_mutex_t mutex = mi;
	lwp_cond_t cond = ci;
	exit (
	_lwp_mutex_lock(&mutex) ||
	_lwp_mutex_unlock(&mutex));
], [db_cv_mutex="Solaris/lwp"])
fi

# POSIX.1 pthreads: pthread_XXX
#
# If the user specified we use POSIX pthreads mutexes, and we fail to find the
# full interface, try and configure for just intra-process support.
if test "$db_cv_mutex" = no -o "$db_cv_mutex" = "posix_only"; then
	LIBS="$LIBS -lpthread"
	AM_PTHREADS_SHARED("POSIX/pthreads/library")
	LIBS="$orig_libs"
fi
if test "$db_cv_mutex" = no -o "$db_cv_mutex" = "posix_only"; then
	AM_PTHREADS_SHARED("POSIX/pthreads")
fi
if test "$db_cv_mutex" = "posix_only"; then
	AM_PTHREADS_PRIVATE("POSIX/pthreads/private")
fi
if test "$db_cv_mutex" = "posix_only"; then
	LIBS="$LIBS -lpthread"
	AM_PTHREADS_PRIVATE("POSIX/pthreads/library/private")
	LIBS="$orig_libs"
fi
if test "$db_cv_mutex" = "posix_only"; then
	AC_MSG_ERROR([unable to find POSIX 1003.1 mutex interfaces])
fi

# UI threads: thr_XXX
if test "$db_cv_mutex" = no -o "$db_cv_mutex" = "ui_only"; then
LIBS="$LIBS -lthread"
AC_TRY_LINK([
#include <thread.h>
#include <synch.h>],[
	mutex_t mutex;
	cond_t cond;
	int type = USYNC_PROCESS;
	exit (
	mutex_init(&mutex, type, NULL) ||
	cond_init(&cond, type, NULL) ||
	mutex_lock(&mutex) ||
	mutex_unlock(&mutex));
], [db_cv_mutex="UI/threads/library"])
LIBS="$orig_libs"
fi
if test "$db_cv_mutex" = no -o "$db_cv_mutex" = "ui_only"; then
AC_TRY_LINK([
#include <thread.h>
#include <synch.h>],[
	mutex_t mutex;
	cond_t cond;
	int type = USYNC_PROCESS;
	exit (
	mutex_init(&mutex, type, NULL) ||
	cond_init(&cond, type, NULL) ||
	mutex_lock(&mutex) ||
	mutex_unlock(&mutex));
], [db_cv_mutex="UI/threads"])
fi
if test "$db_cv_mutex" = "ui_only"; then
	AC_MSG_ERROR([unable to find UI mutex interfaces])
fi

# msemaphore: HPPA only
# Try HPPA before general msem test, it needs special alignment.
if test "$db_cv_mutex" = no; then
AC_TRY_LINK([
#include <sys/mman.h>],[
#if defined(__hppa)
	typedef msemaphore tsl_t;
	msemaphore x;
	msem_init(&x, 0);
	msem_lock(&x, 0);
	msem_unlock(&x, 0);
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex="HP/msem_init"])
fi

# msemaphore: AIX, OSF/1
if test "$db_cv_mutex" = no; then
AC_TRY_LINK([
#include <sys/types.h>
#include <sys/mman.h>],[
	typedef msemaphore tsl_t;
	msemaphore x;
	msem_init(&x, 0);
	msem_lock(&x, 0);
	msem_unlock(&x, 0);
	exit(0);
], [db_cv_mutex="UNIX/msem_init"])
fi

# ReliantUNIX
if test "$db_cv_mutex" = no; then
LIBS="$LIBS -lmproc"
AC_TRY_LINK([
#include <ulocks.h>],[
	typedef spinlock_t tsl_t;
	spinlock_t x;
	initspin(&x, 1);
	cspinlock(&x);
	spinunlock(&x);
], [db_cv_mutex="ReliantUNIX/initspin"])
LIBS="$orig_libs"
fi

# SCO: UnixWare has threads in libthread, but OpenServer doesn't.
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if defined(__USLC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex="SCO/x86/cc-assembly"])
fi

# abilock_t: SGI
if test "$db_cv_mutex" = no; then
AC_TRY_LINK([
#include <abi_mutex.h>],[
	typedef abilock_t tsl_t;
	abilock_t x;
	init_lock(&x);
	acquire_lock(&x);
	release_lock(&x);
], [db_cv_mutex="SGI/init_lock"])
fi

# sema_t: Solaris
# The sema_XXX calls do not work on Solaris 5.5.  I see no reason to ever
# turn this test on, unless we find some other platform that uses the old
# POSIX.1 interfaces.  (I plan to move directly to pthreads on Solaris.)
if test "$db_cv_mutex" = DOESNT_WORK; then
AC_TRY_LINK([
#include <synch.h>],[
	typedef sema_t tsl_t;
	sema_t x;
	sema_init(&x, 1, USYNC_PROCESS, NULL);
	sema_wait(&x);
	sema_post(&x);
], [db_cv_mutex="UNIX/sema_init"])
fi

# _lock_try/_lock_clear: Solaris
# On Solaris systems without Pthread or UI mutex interfaces, DB uses the
# undocumented _lock_try _lock_clear function calls instead of either the
# sema_trywait(3T) or sema_wait(3T) function calls.  This is because of
# problems in those interfaces in some releases of the Solaris C library.
if test "$db_cv_mutex" = no; then
AC_TRY_LINK([
#include <sys/machlock.h>],[
	typedef lock_t tsl_t;
	lock_t x;
	_lock_try(&x);
	_lock_clear(&x);
], [db_cv_mutex="Solaris/_lock_try"])
fi

# _check_lock/_clear_lock: AIX
if test "$db_cv_mutex" = no; then
AC_TRY_LINK([
#include <sys/atomic_op.h>],[
	int x;
	_check_lock(&x,0,1);
	_clear_lock(&x,0);
], [db_cv_mutex="AIX/_check_lock"])
fi

# _spin_lock_try/_spin_unlock: Apple/Darwin
if test "$db_cv_mutex" = no; then
AC_TRY_LINK(,[
	int x;
	_spin_lock_try(&x);