gcc/libstdc++-v3/configure.ac
Mike Crowe ab40695a46 libstdc++: Add full steady_clock support to shared_timed_mutex
The pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock functions
were added to glibc in v2.30. They have also been added to Android
Bionic. If these functions are available in the C library then they can
be used to implement shared_timed_mutex::try_lock_until,
shared_timed_mutex::try_lock_for,
shared_timed_mutex::try_lock_shared_until and
shared_timed_mutex::try_lock_shared_for so that they are no longer
unaffected by the system clock being warped. (This is the shared_mutex
equivalent of PR libstdc++/78237 for mutex.)

If the new functions are available then steady_clock is deemed to be the
"best" clock available which means that it is used for the relative
try_lock_for calls and absolute try_lock_until calls using steady_clock
and user-defined clocks. It's not possible to have
_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK defined without
_GLIBCXX_USE_PTHREAD_RWLOCK_T, so the requirement that the clock be the
same as condition_variable is maintained. Calls explicitly using
system_clock (aka high_resolution_clock) continue to use CLOCK_REALTIME
via the old pthread_rwlock_timedrdlock and pthread_rwlock_timedwrlock
functions.

If the new functions are not available then system_clock is deemed to be
the "best" clock available which means that the previous suboptimal
behaviour remains.

Additionally, the user-defined clock used with
shared_timed_mutex::try_lock_for and shared_mutex::try_lock_shared_for
may have higher precision than __clock_t. We may need to round the
duration up to ensure that the timeout is long enough. (See
__timed_mutex_impl::_M_try_lock_for)

2019-12-02  Mike Crowe  <mac@mcrowe.com>

	Add full steady_clock support to shared_timed_mutex
	* acinclude.m4 (GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK): Define
	to check for the presence of both pthread_rwlock_clockrdlock and
	pthread_rwlock_clockwrlock.
	* config.h.in: Regenerate.
	* configure.ac: Call GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK.
	* configure: Regenerate.
	* include/std/shared_mutex (shared_timed_mutex): Define __clock_t as
	the best clock to use for relative waits.
	(shared_timed_mutex::try_lock_for) Round up wait duration if necessary.
	(shared_timed_mutex::try_lock_shared_for): Likewise.
	(shared_timed_mutex::try_lock_until): Use existing try_lock_until
	implementation for system_clock (which matches __clock_t when
	_GLIBCCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK is not defined). Add new
	overload for steady_clock that uses pthread_rwlock_clockwrlock if it
	is available. Simplify overload for non-standard clock to just call
	try_lock_for with a relative timeout.
	(shared_timed_mutex::try_lock_shared_until): Likewise.

From-SVN: r278903
2019-12-02 16:23:10 +00:00

596 lines
19 KiB
Plaintext

# Process this file with autoreconf to produce a configure script.
AC_INIT(package-unused, version-unused,, libstdc++)
AC_CONFIG_SRCDIR(src/shared/hashtable-aux.cc)
AC_CONFIG_HEADER(config.h)
# This works around the fact that libtool configuration may change LD
# for this particular configuration, but some shells, instead of
# keeping the changes in LD private, export them just because LD is
# exported. Only used at the end of this file.
### am handles this now? ORIGINAL_LD_FOR_MULTILIBS=$LD
# Find the rest of the source tree framework.
AM_ENABLE_MULTILIB(, ..)
# Gets build, host, target, *_vendor, *_cpu, *_os, etc.
#
# You will slowly go insane if you do not grok the following fact: when
# building v3 as part of the compiler, the top-level /target/ becomes the
# library's /host/. configure then causes --target to default to --host,
# exactly like any other package using autoconf. Therefore, 'target' and
# 'host' will always be the same. This makes sense both for native and
# cross compilers, just think about it for a little while. :-)
#
# Also, if v3 is being configured as part of a cross compiler, the top-level
# configure script will pass the "real" host as $with_cross_host.
#
# Do not delete or change the following two lines. For why, see
# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
AC_CANONICAL_SYSTEM
target_alias=${target_alias-$host_alias}
# Handy for debugging:
#AC_MSG_NOTICE($build / $host / $target / $host_alias / $target_alias); sleep 5
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# We are being configured with some form of cross compiler.
GLIBCXX_IS_NATIVE=false
case "$host","$target" in
# Darwin crosses can use the host system's libraries and headers,
# because of the fat library support. Of course, it must be the
# same version of Darwin on both sides. Allow the user to
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;;
*)
GCC_NO_EXECUTABLES
;;
esac
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AM_PROG_LIBTOOL
ACX_LT_HOST_FLAGS
AC_SUBST(enable_shared)
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if test "$enable_shared" = yes; then
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glibcxx_compiler_pic_flag="$lt_prog_compiler_pic_CXX"
glibcxx_compiler_shared_flag="-D_GLIBCXX_SHARED"
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AC_SUBST(glibcxx_compiler_shared_flag)
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# Possibly disable most of the library.
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GLIBCXX_ENABLE_VERBOSE
# Enable compiler support that doesn't require linking.
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GLIBCXX_ENABLE_THREADS
GLIBCXX_ENABLE_ATOMIC_BUILTINS
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GLIBCXX_ENABLE_DECIMAL_FLOAT
GLIBCXX_ENABLE_INT128_FLOAT128
if test "$enable_float128" = yes; then
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# Checks for compiler support that doesn't require linking.
GLIBCXX_CHECK_COMPILER_FEATURES
# Enable all the variable C++ runtime options that don't require linking.
GLIBCXX_ENABLE_CSTDIO
GLIBCXX_ENABLE_CLOCALE
GLIBCXX_ENABLE_ALLOCATOR
GLIBCXX_ENABLE_CHEADERS($c_model) dnl c_model from configure.host
GLIBCXX_ENABLE_LONG_LONG([yes])
GLIBCXX_ENABLE_WCHAR_T([yes])
GLIBCXX_ENABLE_C99([yes])
GLIBCXX_ENABLE_CONCEPT_CHECKS([no])
GLIBCXX_ENABLE_DEBUG_FLAGS(["-gdwarf-4 -g3 -O0 -D_GLIBCXX_ASSERTIONS"])
GLIBCXX_ENABLE_DEBUG([no])
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GLIBCXX_ENABLE_PYTHON
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# Checks for operating systems support that doesn't require linking.
GLIBCXX_CHECK_STDIO_PROTO
GLIBCXX_CHECK_MATH11_PROTO
GLIBCXX_CHECK_SYSTEM_ERROR
GLIBCXX_CHECK_UCHAR_H
# For the streamoff typedef.
GLIBCXX_CHECK_INT64_T
# For LFS support.
GLIBCXX_CHECK_LFS
# For showmanyc_helper().
AC_CHECK_HEADERS(sys/ioctl.h sys/filio.h)
GLIBCXX_CHECK_POLL
GLIBCXX_CHECK_S_ISREG_OR_S_IFREG
# For xsputn_2().
AC_CHECK_HEADERS(sys/uio.h)
GLIBCXX_CHECK_WRITEV
# Check for fenv.h and complex.h before GLIBCXX_CHECK_C99_TR1
# so that the check is done with the C compiler (not C++).
# Checking with C++ can break a canadian cross build if either
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AC_CHECK_HEADERS(fenv.h complex.h)
# For C99 support to TR1.
GLIBCXX_CHECK_C99_TR1
# For the EOF, SEEK_CUR, and SEEK_END integer constants.
GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS
# For gettimeofday support.
GLIBCXX_CHECK_GETTIMEOFDAY
# For clock_gettime, nanosleep and sched_yield support.
GLIBCXX_ENABLE_LIBSTDCXX_TIME
# Check for tmpnam which is obsolescent in POSIX.1-2008
GLIBCXX_CHECK_TMPNAM
# For pthread_cond_clockwait
GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT
# For pthread_mutex_clocklock
GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK
# For pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock
GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK
AC_LC_MESSAGES
# For hardware_concurrency
AC_CHECK_HEADERS(sys/sysinfo.h)
GLIBCXX_CHECK_GET_NPROCS
AC_CHECK_HEADERS(unistd.h)
GLIBCXX_CHECK_SC_NPROCESSORS_ONLN
GLIBCXX_CHECK_SC_NPROC_ONLN
GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP
GLIBCXX_CHECK_SYSCTL_HW_NCPU
GLIBCXX_CHECK_SDT_H
# Check for available headers.
AC_CHECK_HEADERS([endian.h execinfo.h float.h fp.h ieeefp.h inttypes.h \
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if $GLIBCXX_IS_NATIVE; then
# We can do more elaborate tests that assume a working linker.
CANADIAN=no
GLIBCXX_CHECK_LINKER_FEATURES
GLIBCXX_CHECK_MATH_SUPPORT
GLIBCXX_CHECK_STDLIB_SUPPORT
# For /dev/random and /dev/urandom for std::random_device.
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# For TLS support.
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AC_CHECK_FUNCS(__cxa_thread_atexit_impl __cxa_thread_atexit)
AC_CHECK_FUNCS(aligned_alloc posix_memalign memalign _aligned_malloc)
AC_CHECK_FUNCS(_wfopen)
# C11 functions for C++17 library
AC_CHECK_FUNCS(timespec_get)
# For Networking TS.
AC_CHECK_FUNCS(sockatmark)
# For iconv support.
AM_ICONV
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# This lets us hard-code the functionality we know we'll have in the cross
# target environment. "Let" is a sugar-coated word placed on an especially
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# Here's why GLIBCXX_CHECK_MATH_SUPPORT, and other autoconf macros
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# "cannot open crt0.o"
# etc. All this is because there currently exists no unified, consistent
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# When all of that is done, all of this hokey, excessive AC_DEFINE junk for
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# If Canadian cross, then don't pick up tools from the build directory.
# Used only in GLIBCXX_EXPORT_INCLUDES.
if test -n "$with_cross_host" &&
test x"$build_alias" != x"$with_cross_host" &&
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CANADIAN=no
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# Construct crosses by hand, eliminating bits that need ld...
# GLIBCXX_CHECK_MATH_SUPPORT
# First, test for "known" system libraries. We may be using newlib even
# on a hosted environment.
if test "x${with_newlib}" = "xyes"; then
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AC_DEFINE(HAVE_HYPOT)
# GLIBCXX_CHECK_STDLIB_SUPPORT
AC_DEFINE(HAVE_STRTOF)
AC_DEFINE(HAVE_ACOSF)
AC_DEFINE(HAVE_ASINF)
AC_DEFINE(HAVE_ATAN2F)
AC_DEFINE(HAVE_ATANF)
AC_DEFINE(HAVE_CEILF)
AC_DEFINE(HAVE_COSF)
AC_DEFINE(HAVE_COSHF)
AC_DEFINE(HAVE_EXPF)
AC_DEFINE(HAVE_FABSF)
AC_DEFINE(HAVE_FLOORF)
AC_DEFINE(HAVE_FMODF)
AC_DEFINE(HAVE_FREXPF)
AC_DEFINE(HAVE_LDEXPF)
AC_DEFINE(HAVE_LOG10F)
AC_DEFINE(HAVE_LOGF)
AC_DEFINE(HAVE_MODFF)
AC_DEFINE(HAVE_POWF)
AC_DEFINE(HAVE_SINF)
AC_DEFINE(HAVE_SINHF)
AC_DEFINE(HAVE_SQRTF)
AC_DEFINE(HAVE_TANF)
AC_DEFINE(HAVE_TANHF)
AC_DEFINE(HAVE_ICONV)
AC_DEFINE(HAVE_MEMALIGN)
else
GLIBCXX_CROSSCONFIG
fi
# At some point, we should differentiate between architectures
# like x86, which have long double versions, and alpha/powerpc/etc.,
# which don't. For the time being, punt.
if test x"long_double_math_on_this_cpu" = x"yes"; then
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AC_DEFINE(HAVE_ATANL)
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AC_DEFINE(HAVE_SINCOSL)
AC_DEFINE(HAVE_SINL)
AC_DEFINE(HAVE_SINHL)
AC_DEFINE(HAVE_SQRTL)
AC_DEFINE(HAVE_TANL)
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# Check for _Unwind_GetIPInfo.
GCC_CHECK_UNWIND_GETIPINFO
GCC_LINUX_FUTEX([AC_DEFINE(HAVE_LINUX_FUTEX, 1, [Define if futex syscall is available.])])
GCC_HEADER_STDINT(include/gstdint.h)
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AC_SUBST(libtool_VERSION)
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ac_ldbl_compat=no
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sparc*-*-linux* | \
s390*-*-linux* | \
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AC_SUBST(LONG_DOUBLE_COMPAT_FLAGS)
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GCC_CHECK_ASSEMBLER_HWCAP
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# Check if assembler supports rdseed opcode.
GLIBCXX_CHECK_X86_RDSEED
# This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE.
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GLIBCXX_CHECK_SIZE_T_MANGLING
# Check which release added std::exception_ptr for the target
GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER
# Define documentation rules conditionally.
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ACX_CHECK_PROG_VER([MAKEINFO], [makeinfo], [--version],
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AC_CHECK_PROG([XSLTPROC], xsltproc, yes, no)
AC_CHECK_PROG([XMLLINT], xmllint, yes, no)
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AC_CACHE_SAVE
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# Export all the install information.
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GLIBCXX_EXPORT_FLAGS
# Determine what GCC version number to use in filesystem paths.
GCC_BASE_VER
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# Also, get rid of this simulated-VPATH thing that automake does.
AC_CONFIG_FILES(AC_FOREACH([DIR], glibcxx_SUBDIRS, [DIR/Makefile ]),
[cat > vpsed$$ << \_EOF
s!`test -f '$<' || echo '$(srcdir)/'`!!
_EOF
sed -f vpsed$$ $ac_file > tmp$$
mv tmp$$ $ac_file
rm vpsed$$
echo 'MULTISUBDIR =' >> $ac_file
ml_norecursion=yes
. ${multi_basedir}/config-ml.in
AS_UNSET([ml_norecursion])
])
AC_CONFIG_COMMANDS([generate-headers],
[(cd include && ${MAKE-make} pch_build= )])
dnl And this actually makes things happen:
AC_OUTPUT