mutex.m4

linux 下的源代码分析阅读器 red hat公司新版

#endif
], [db_cv_mutex=ALPHA/gcc-assembly])
fi

# ARM/gcc: Linux
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if defined(__arm__) && defined(__GNUC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=ARM/gcc-assembly])
fi

# MIPS/gcc: Linux
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if (defined(__mips) || defined(__mips__)) && defined(__GNUC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=MIPS/gcc-assembly])
fi

# PaRisc/gcc: HP/UX
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if (defined(__hppa) || defined(__hppa__)) && defined(__GNUC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=HPPA/gcc-assembly])
fi

# PPC/gcc:
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if (defined(__powerpc__) || defined(__ppc__)) && defined(__GNUC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=PPC/gcc-assembly])
fi

# 68K/gcc: SunOS
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if (defined(mc68020) || defined(sun3)) && defined(__GNUC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=68K/gcc-assembly])
fi

# S390/cc: IBM OS/390 Unix
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if defined(__MVS__) && defined(__IBMC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=S390/cc-assembly])
fi

# S390/gcc: Linux
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if defined(__s390__) && defined(__GNUC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=S390/gcc-assembly])
fi

# ia64/gcc: Linux
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if defined(__ia64) && defined(__GNUC__)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=ia64/gcc-assembly])
fi

# uts/cc: UTS
if test "$db_cv_mutex" = no; then
AC_TRY_COMPILE(,[
#if defined(_UTS)
	exit(0);
#else
	FAIL TO COMPILE/LINK
#endif
], [db_cv_mutex=UTS/cc-assembly])
fi

# UNIX fcntl system call mutexes.
if test "$db_cv_mutex" = no; then
	db_cv_mutex=UNIX/fcntl
AC_TRY_LINK([
#include <fcntl.h>],[
	struct flock l;
	l.l_whence = SEEK_SET;
	l.l_start = 10;
	l.l_len = 1;
	l.l_type = F_WRLCK;
	fcntl(0, F_SETLK, &l);
], [db_cv_mutex=UNIX/fcntl])
fi
])

# Mutexes may not have been found, or may have been disabled.
case "$db_cv_mutex" in
disabled)		;;
no)
			AC_MSG_ERROR([Unable to find a mutex implementation]);;
*)			AC_DEFINE(HAVE_MUTEX_SUPPORT)
			AH_TEMPLATE(HAVE_MUTEX_SUPPORT,
			    [Define to 1 if the Berkeley DB library should support mutexes.])
esac

# Configure a pthreads-style mutex implementation.
hybrid=pthread
case "$db_cv_mutex" in
POSIX/pthreads*)	ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_PTHREADS)
			AH_TEMPLATE(HAVE_MUTEX_PTHREADS,
			    [Define to 1 to use POSIX 1003.1 pthread_XXX mutexes.]);;
POSIX/pthreads/private*)ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_PTHREADS)
			AC_DEFINE(HAVE_MUTEX_THREAD_ONLY)
			AH_TEMPLATE(HAVE_MUTEX_THREAD_ONLY,
			    [Define to 1 to configure mutexes intra-process only.]);;
POSIX/pthreads/library*)ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_PTHREADS);;
POSIX/pthreads/library/private*)
			ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_PTHREADS)
			AC_DEFINE(HAVE_MUTEX_THREAD_ONLY);;
Solaris/lwp*)		ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_SOLARIS_LWP)
			AH_TEMPLATE(HAVE_MUTEX_SOLARIS_LWP,
			    [Define to 1 to use the Solaris lwp threads mutexes.]);;
UI/threads*)		ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_UI_THREADS)
			AH_TEMPLATE(HAVE_MUTEX_UI_THREADS,
			    [Define to 1 to use the UNIX International mutexes.]);;
UI/threads/library*)	ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_UI_THREADS);;
*)			hybrid=no;;
esac

# Configure a test-and-set mutex implementation.
case "$db_cv_mutex" in
68K/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_68K_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_68K_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and 68K assembly language mutexes.]);;
AIX/_check_lock)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_AIX_CHECK_LOCK)
			AH_TEMPLATE(HAVE_MUTEX_AIX_CHECK_LOCK,
			    [Define to 1 to use the AIX _check_lock mutexes.]);;
Darwin/_spin_lock_try)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_DARWIN_SPIN_LOCK_TRY)
			AH_TEMPLATE(HAVE_MUTEX_DARWIN_SPIN_LOCK_TRY,
			    [Define to 1 to use the Apple/Darwin _spin_lock_try mutexes.]);;
ALPHA/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_ALPHA_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_ALPHA_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and Alpha assembly language mutexes.]);;
ARM/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_ARM_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_ARM_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and ARM assembly language mutexes.]);;
HP/msem_init)		ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_HPPA_MSEM_INIT)
			AH_TEMPLATE(HAVE_MUTEX_HPPA_MSEM_INIT,
			    [Define to 1 to use the msem_XXX mutexes on HP-UX.]);;
HPPA/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_HPPA_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_HPPA_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and PaRisc assembly language mutexes.]);;
ia64/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_IA64_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_IA64_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and IA64 assembly language mutexes.]);;
MIPS/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_MIPS_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_MIPS_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and MIPS assembly language mutexes.]);;
PPC/gcc-assembly)
			ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_PPC_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_PPC_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and PowerPC assembly language mutexes.]);;
ReliantUNIX/initspin)	LIBSO_LIBS="$LIBSO_LIBS -lmproc"
			ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_RELIANTUNIX_INITSPIN)
			AH_TEMPLATE(HAVE_MUTEX_RELIANTUNIX_INITSPIN,
			    [Define to 1 to use Reliant UNIX initspin mutexes.]);;
S390/cc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_S390_CC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_S390_CC_ASSEMBLY,
			    [Define to 1 to use the IBM C compiler and S/390 assembly language mutexes.]);;
S390/gcc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_S390_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_S390_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and S/390 assembly language mutexes.]);;
SCO/x86/cc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_SCO_X86_CC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_SCO_X86_CC_ASSEMBLY,
			    [Define to 1 to use the SCO compiler and x86 assembly language mutexes.]);;
SGI/init_lock)		ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_SGI_INIT_LOCK)
			AH_TEMPLATE(HAVE_MUTEX_SGI_INIT_LOCK,
			    [Define to 1 to use the SGI XXX_lock mutexes.]);;
Solaris/_lock_try)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_SOLARIS_LOCK_TRY)
			AH_TEMPLATE(HAVE_MUTEX_SOLARIS_LOCK_TRY,
			    [Define to 1 to use the Solaris _lock_XXX mutexes.]);;
*Solaris/_lock_try/membar)
			hybrid="$hybrid/tas"
			ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_SOLARIS_LOCK_TRY)
			AH_TEMPLATE(HAVE_MUTEX_SOLARIS_LOCK_TRY,
			    [Define to 1 to use the Solaris _lock_XXX mutexes.]);;
*Sparc/gcc-assembly)	hybrid="$hybrid/tas"
			ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_SPARC_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_SPARC_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and Sparc assembly language mutexes.]);;
Tru64/cc-assembly)	ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_TRU64_CC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_TRU64_CC_ASSEMBLY,
			    [Define to 1 to use the CC compiler and Tru64 assembly language mutexes.]);;
UNIX/msem_init)		ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_MSEM_INIT)
			AH_TEMPLATE(HAVE_MUTEX_MSEM_INIT,
			    [Define to 1 to use the msem_XXX mutexes on systems other than HP-UX.]);;
UNIX/sema_init)		ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_SEMA_INIT)
			AH_TEMPLATE(HAVE_MUTEX_SEMA_INIT,
			    [Define to 1 to use the obsolete POSIX 1003.1 sema_XXX mutexes.]);;
UTS/cc-assembly)	ADDITIONAL_OBJS="uts4.cc${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_UTS_CC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_UTS_CC_ASSEMBLY,
			    [Define to 1 to use the UTS compiler and assembly language mutexes.]);;
*x86/gcc-assembly)	hybrid="$hybrid/tas"
			ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_X86_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_X86_GCC_ASSEMBLY,
			    [Define to 1 to use the GCC compiler and 32-bit x86 assembly language mutexes.]);;
*x86_64/gcc-assembly)	hybrid="$hybrid/tas"
			ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_X86_64_GCC_ASSEMBLY)
			AH_TEMPLATE(HAVE_MUTEX_X86_64_GCC_ASSEMBLY,
			[Define to 1 to use the GCC compiler and 64-bit x86 assembly language mutexes.]);;
esac

# Configure the remaining special cases.
case "$db_cv_mutex" in
UNIX/fcntl)		AC_MSG_WARN(
			    [NO FAST MUTEXES FOUND FOR THIS COMPILER/ARCHITECTURE.])
			ADDITIONAL_OBJS="mut_fcntl${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_FCNTL)
			AH_TEMPLATE(HAVE_MUTEX_FCNTL,
			    [Define to 1 to use the UNIX fcntl system call mutexes.]);;
win32)			ADDITIONAL_OBJS="mut_win32${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_WIN32)
			AH_TEMPLATE(HAVE_MUTEX_WIN32, [Define to 1 to use the MSVC compiler and Windows mutexes.]);;
win32/gcc)		ADDITIONAL_OBJS="mut_win32${o} $ADDITIONAL_OBJS"
			AC_DEFINE(HAVE_MUTEX_WIN32_GCC)
			AH_TEMPLATE(HAVE_MUTEX_WIN32_GCC, [Define to 1 to use the GCC compiler and Windows mutexes.]);;
esac

# We may have found both a pthreads-style mutex implementation as well as a
# test-and-set, in which case configure for the hybrid.
if test "$hybrid" = pthread/tas; then
	AC_DEFINE(HAVE_MUTEX_HYBRID)
	AH_TEMPLATE(HAVE_MUTEX_HYBRID,
	    [Define to 1 to use test-and-set mutexes with blocking mutexes.])
fi

# The mutex selection may require specific declarations -- we fill in most of
# them above, but here are the common ones.
#
# The mutex selection may tell us what kind of thread package we're using,
# which we use to figure out the thread type.
#
# If we're configured for the POSIX pthread API, then force the thread ID type
# and include function, regardless of the mutex selection.  Ditto for the
# (default) Solaris lwp mutexes, because they don't have a way to return the
# thread ID.
#
# 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.
# For that reason always add -lpthread if we're using pthread calls or mutexes
# and there's a pthread library.
#
# We can't depend on any specific call existing (pthread_create, for example),
# as it may be #defined in an include file -- OSF/1 (Tru64) has this problem.

AC_SUBST(thread_h_decl)
AC_SUBST(db_threadid_t_decl)
db_threadid_t_decl=notset

case "$db_cv_mutex" in
POSIX/pthread*|Solaris/lwp*)
	thread_h_decl="#include <pthread.h>"
	db_threadid_t_decl="typedef pthread_t db_threadid_t;"
	AC_HAVE_LIBRARY(pthread, LIBSO_LIBS="$LIBSO_LIBS -lpthread");;
UI/threads*)
	thread_h_decl="#include <thread.h>"
	db_threadid_t_decl="typedef thread_t db_threadid_t;"
	AC_HAVE_LIBRARY(thread, LIBSO_LIBS="$LIBSO_LIBS -lthread");;
*)
	if test "$db_cv_pthread_api" = yes; then
		thread_h_decl="#include <pthread.h>"
		db_threadid_t_decl="typedef pthread_t db_threadid_t;"
		AC_HAVE_LIBRARY(pthread, LIBSO_LIBS="$LIBSO_LIBS -lpthread")
	fi;;
esac

# We need to know if the thread ID type will fit into an integral type and we
# can compare it for equality and generally treat it like an int, or if it's a
# non-integral type and we have to treat it like a structure or other untyped
# block of bytes.  For example, MVS typedef's pthread_t to a structure.
AH_TEMPLATE(HAVE_SIMPLE_THREAD_TYPE,
    [Define to 1 if thread identifier type db_threadid_t is integral.])
if test "$db_threadid_t_decl" = notset; then
	db_threadid_t_decl="typedef uintmax_t db_threadid_t;"
	AC_DEFINE(HAVE_SIMPLE_THREAD_TYPE)
else
	AC_TRY_COMPILE(
	#include <sys/types.h>
	$thread_h_decl, [
	$db_threadid_t_decl
	db_threadid_t a;
	a = 0;
	], AC_DEFINE(HAVE_SIMPLE_THREAD_TYPE))
fi

# If we're building replication and configured with POSIX pthreads or were
# told to build using the POSIX API, build the replication manager framework.
db_cv_build_replication_mgr=no
if test "$db_cv_build_replication" = yes; then
	AH_TEMPLATE(HAVE_REPLICATION_THREADS,
	    [Define to 1 if building the Berkeley DB replication framework.])
	case "$db_cv_mutex" in
	POSIX/pthread*|Solaris/lwp)
		db_cv_build_replication_mgr=yes;;
	esac
	if test "$db_cv_pthread_api" = yes; then
		db_cv_build_replication_mgr=yes
	fi

	if test "$db_cv_build_replication_mgr" = yes; then
		AC_DEFINE(HAVE_REPLICATION_THREADS)

		# Solaris requires the socket and nsl libraries to build the
		# replication manager.  Don't add nsl regardless of the OS,
		# it causes RPC to fail on AIX 4.3.3.
		case "$host_os" in
		solaris*)
			AC_HAVE_LIBRARY(nsl, LIBSO_LIBS="$LIBSO_LIBS -lnsl")
			AC_HAVE_LIBRARY(socket,
			    LIBSO_LIBS="$LIBSO_LIBS -lsocket");;
		esac
	fi
fi

# There are 3 classes of mutexes:
#
# 1: Mutexes requiring no cleanup, for example, test-and-set mutexes.
# 2: Mutexes that must be destroyed, but which don't hold permanent system
#    resources, for example, pthread mutexes on MVS aka OS/390 aka z/OS.
# 3: Mutexes that must be destroyed, even after the process is gone, for
#    example, pthread mutexes on QNX and binary semaphores on VxWorks.
#
# DB cannot currently distinguish between #2 and #3 because DB does not know
# if the application is running environment recovery as part of startup and
# does not need to do cleanup, or if the environment is being removed and/or
# recovered in a loop in the application, and so does need to clean up.  If
# we get it wrong, we're going to call the mutex destroy routine on a random
# piece of memory, which usually works, but just might drop core.  For now,
# we group #2 and #3 into the HAVE_MUTEX_SYSTEM_RESOURCES define, until we
# have a better solution or reason to solve this in a general way -- so far,
# the places we've needed to handle this are few.
AH_TEMPLATE(HAVE_MUTEX_SYSTEM_RESOURCES,
    [Define to 1 if mutexes hold system resources.])

case "$host_os$db_cv_mutex" in
*qnx*POSIX/pthread*|openedition*POSIX/pthread*)
	AC_DEFINE(HAVE_MUTEX_SYSTEM_RESOURCES);;
esac])