glibc/support/Makefile

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# Makefile for support library, used only at build and test time
# Copyright (C) 2016-2021 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
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# <https://www.gnu.org/licenses/>.
subdir := support
include ../Makeconfig
extra-libs := libsupport
extra-libs-others = $(extra-libs)
extra-libs-noinstall := $(extra-libs)
libsupport-routines = \
blob_repeat \
check \
check_addrinfo \
check_dns_packet \
check_hostent \
check_netent \
delayed_exit \
ignore_stderr \
next_to_fault \
oom_error \
resolv_response_context_duplicate \
resolv_response_context_free \
resolv_test \
set_fortify_handler \
support-xfstat \
support-xstat \
support_become_root \
support_can_chroot \
support_capture_subprocess \
support_capture_subprocess_check \
support_chroot \
support_copy_file \
support_copy_file_range \
support_descriptor_supports_holes \
support_descriptors \
support_enter_mount_namespace \
support_enter_network_namespace \
support_format_address_family \
support_format_addrinfo \
support_format_dns_packet \
support_format_herrno \
support_format_hostent \
support_format_netent \
support_isolate_in_subprocess \
support_process_state \
support_ptrace \
[BZ 1190] Make EOF sticky in stdio. C99 specifies that the EOF condition on a file is "sticky": once EOF has been encountered, all subsequent reads should continue to return EOF until the file is closed or something clears the "end-of-file indicator" (e.g. fseek, clearerr). This is arguably a change from C89, where the wording was ambiguous; the BSDs always had sticky EOF, but the System V lineage would attempt to read from the underlying fd again. GNU libc has followed System V for as long as we've been using libio, but nowadays C99 conformance and BSD compatibility are more important than System V compatibility. You might wonder if changing the _underflow impls is sufficient to apply the C99 semantics to all of the many stdio functions that perform input. It should be enough to cover all paths to _IO_SYSREAD, and the only other functions that call _IO_SYSREAD are the _seekoff impls, which is OK because seeking clears EOF, and the _xsgetn impls, which, as far as I can tell, are unused within glibc. The test programs in this patch use a pseudoterminal to set up the necessary conditions. To facilitate this I added a new test-support function that sets up a pair of pty file descriptors for you; it's almost the same as BSD openpty, the only differences are that it allocates the optionally-returned tty pathname with malloc, and that it crashes if anything goes wrong. [BZ #1190] [BZ #19476] * libio/fileops.c (_IO_new_file_underflow): Return EOF immediately if the _IO_EOF_SEEN bit is already set; update commentary. * libio/oldfileops.c (_IO_old_file_underflow): Likewise. * libio/wfileops.c (_IO_wfile_underflow): Likewise. * support/support_openpty.c, support/tty.h: New files. * support/Makefile (libsupport-routines): Add support_openpty. * libio/tst-fgetc-after-eof.c, wcsmbs/test-fgetwc-after-eof.c: New test cases. * libio/Makefile (tests): Add tst-fgetc-after-eof. * wcsmbs/Makefile (tests): Add tst-fgetwc-after-eof.
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support_openpty \
support_paths \
support_quote_blob \
support_quote_string \
support_record_failure \
support_run_diff \
support_set_small_thread_stack_size \
support_shared_allocate \
support_small_stack_thread_attribute \
support_subprocess \
support_test_compare_blob \
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support_test_compare_failure \
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support_test_compare_string \
support_write_file_string \
support_test_main \
support_test_verify_impl \
temp_file \
timespec \
timespec-add \
timespec-sub \
write_message \
xaccept \
xaccept4 \
xasprintf \
xbind \
xcalloc \
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xchdir \
xchroot \
xclock_gettime \
xclose \
xchmod \
xconnect \
xcopy_file_range \
xdlfcn \
xdlmopen \
xdup2 \
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xfchmod \
xfclose \
xfopen \
xfork \
xftruncate \
xgetline \
xgetsockname \
xlisten \
xlseek \
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xlstat \
xmalloc \
xmemstream \
xmkdir \
xmkdirp \
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xmmap \
xmprotect \
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xmunmap \
xnewlocale \
xopen \
xpipe \
xpoll \
xposix_memalign \
xpthread_attr_destroy \
xpthread_attr_init \
xpthread_attr_setdetachstate \
nptl: Invert the mmap/mprotect logic on allocated stacks (BZ#18988) Current allocate_stack logic for create stacks is to first mmap all the required memory with the desirable memory and then mprotect the guard area with PROT_NONE if required. Although it works as expected, it pessimizes the allocation because it requires the kernel to actually increase commit charge (it counts against the available physical/swap memory available for the system). The only issue is to actually check this change since side-effects are really Linux specific and to actually account them it would require a kernel specific tests to parse the system wide information. On the kernel I checked /proc/self/statm does not show any meaningful difference for vmm and/or rss before and after thread creation. I could only see really meaningful information checking on system wide /proc/meminfo between thread creation: MemFree, MemAvailable, and Committed_AS shows large difference without the patch. I think trying to use these kind of information on a testcase is fragile. The BZ#18988 reports shows that the commit pages are easily seen with mlockall (MCL_FUTURE) (with lock all pages that become mapped in the process) however a more straighfoward testcase shows that pthread_create could be faster using this patch: -- static const int inner_count = 256; static const int outer_count = 128; static void *thread1(void *arg) { return NULL; } static void *sleeper(void *arg) { pthread_t ts[inner_count]; for (int i = 0; i < inner_count; i++) pthread_create (&ts[i], &a, thread1, NULL); for (int i = 0; i < inner_count; i++) pthread_join (ts[i], NULL); return NULL; } int main(void) { pthread_attr_init(&a); pthread_attr_setguardsize(&a, 1<<20); pthread_attr_setstacksize(&a, 1134592); pthread_t ts[outer_count]; for (int i = 0; i < outer_count; i++) pthread_create(&ts[i], &a, sleeper, NULL); for (int i = 0; i < outer_count; i++) pthread_join(ts[i], NULL); assert(r == 0); } return 0; } -- On x86_64 (4.4.0-45-generic, gcc 5.4.0) running the small benchtests I see: $ time ./test real 0m3.647s user 0m0.080s sys 0m11.836s While with the patch I see: $ time ./test real 0m0.696s user 0m0.040s sys 0m1.152s So I added a pthread_create benchtest (thread_create) which check the thread creation latency. As for the simple benchtests, I saw improvements in thread creation on all architectures I tested the change. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. [BZ #18988] * benchtests/thread_create-inputs: New file. * benchtests/thread_create-source.c: Likewise. * support/xpthread_attr_setguardsize.c: Likewise. * support/Makefile (libsupport-routines): Add xpthread_attr_setguardsize object. * support/xthread.h: Add xpthread_attr_setguardsize prototype. * benchtests/Makefile (bench-pthread): Add thread_create. * nptl/allocatestack.c (allocate_stack): Call mmap with PROT_NONE and then mprotect the required area.
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xpthread_attr_setguardsize \
xpthread_attr_setstack \
xpthread_attr_setstacksize \
xpthread_barrier_destroy \
xpthread_barrier_init \
xpthread_barrier_wait \
xpthread_barrierattr_destroy \
xpthread_barrierattr_init \
xpthread_barrierattr_setpshared \
xpthread_cancel \
xpthread_check_return \
xpthread_cond_wait \
xpthread_create \
xpthread_detach \
xpthread_join \
xpthread_key_create \
xpthread_key_delete \
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xpthread_mutex_consistent \
xpthread_mutex_destroy \
xpthread_mutex_init \
xpthread_mutex_lock \
xpthread_mutex_unlock \
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xpthread_mutexattr_destroy \
xpthread_mutexattr_init \
xpthread_mutexattr_setprotocol \
xpthread_mutexattr_setpshared \
xpthread_mutexattr_setrobust \
xpthread_mutexattr_settype \
xpthread_once \
xpthread_rwlock_init \
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xpthread_rwlock_destroy \
xpthread_rwlock_rdlock \
xpthread_rwlock_unlock \
xpthread_rwlock_wrlock \
xpthread_rwlockattr_init \
xpthread_rwlockattr_setkind_np \
xpthread_sigmask \
xpthread_spin_lock \
xpthread_spin_unlock \
xraise \
xreadlink \
xrealloc \
xrecvfrom \
xsendto \
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xsetlocale \
xsetsockopt \
xsigaction \
xsignal \
xsigstack \
xsocket \
xposix_spawn \
xposix_spawn_file_actions_addclose \
xposix_spawn_file_actions_adddup2 \
xstrdup \
xstrndup \
xsymlink \
xsysconf \
xunlink \
xuselocale \
xwaitpid \
xwrite \
libsupport-static-only-routines := $(libsupport-routines)
# Only build one variant of the library.
libsupport-inhibit-o := .os
ifeq ($(build-shared),yes)
libsupport-inhibit-o += .o
endif
CFLAGS-support_paths.c = \
-DSRCDIR_PATH=\"`cd .. ; pwd`\" \
-DOBJDIR_PATH=\"`cd $(objpfx)/..; pwd`\" \
-DOBJDIR_ELF_LDSO_PATH=\"`cd $(objpfx)/..; pwd`/elf/$(rtld-installed-name)\" \
-DINSTDIR_PATH=\"$(prefix)\" \
-DLIBDIR_PATH=\"$(libdir)\" \
-DBINDIR_PATH=\"$(bindir)\" \
-DSBINDIR_PATH=\"$(sbindir)\" \
-DSLIBDIR_PATH=\"$(slibdir)\" \
-DROOTSBINDIR_PATH=\"$(rootsbindir)\" \
-DCOMPLOCALEDIR_PATH=\"$(complocaledir)\"
# In support_timespec_check_in_range we may be passed a very tight
# range for which we should produce a correct result for expected
# being withing the observed range. The code uses double internally
# in support_timespec_check_in_range and for that computation we use
# -fexcess-precision=standard.
CFLAGS-timespec.c += -fexcess-precision=standard
ifeq (,$(CXX))
LINKS_DSO_PROGRAM = links-dso-program-c
else
LINKS_DSO_PROGRAM = links-dso-program
LDLIBS-links-dso-program = -lstdc++ -lgcc -lgcc_s $(libunwind)
endif
ifeq (yes,$(have-selinux))
LDLIBS-$(LINKS_DSO_PROGRAM) += -lselinux
endif
LDLIBS-test-container = $(libsupport)
others += test-container
others-noinstall += test-container
others += shell-container echo-container true-container
others-noinstall += shell-container echo-container true-container
others += $(LINKS_DSO_PROGRAM)
others-noinstall += $(LINKS_DSO_PROGRAM)
$(objpfx)test-container : $(libsupport)
$(objpfx)shell-container : $(libsupport)
$(objpfx)echo-container : $(libsupport)
$(objpfx)true-container : $(libsupport)
tests = \
README-testing \
tst-support-namespace \
tst-support_blob_repeat \
tst-support_capture_subprocess \
tst-support_descriptors \
tst-support_format_dns_packet \
tst-support-process_state \
tst-support_quote_blob \
tst-support_quote_string \
tst-support_record_failure \
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tst-test_compare \
tst-test_compare_blob \
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tst-test_compare_string \
tst-timespec \
tst-xreadlink \
tst-xsigstack \
ifeq ($(run-built-tests),yes)
tests-special = \
$(objpfx)tst-support_record_failure-2.out
$(objpfx)tst-support_record_failure-2.out: tst-support_record_failure-2.sh \
$(objpfx)tst-support_record_failure
$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
'$(run-program-env)' '$(test-program-prefix-after-env)' \
> $@; \
$(evaluate-test)
endif
$(objpfx)tst-support_format_dns_packet: $(common-objpfx)resolv/libresolv.so
tst-support_capture_subprocess-ARGS = -- $(host-test-program-cmd)
include ../Rules