mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
e5e4d7cc05
POSIX requires that dlclose() and exit() be thread safe, therefore you can have one thread in the middle of dlclose() and another thread executing exit() without causing any undefined behaviour on the part of the implementation. The existing implementation had a flaw that exit() exit handler processing did not consider a concurrent dlclose() and would not mark already run exit handlers using the ef_free flavour. The consequence of this is that a concurrent exit() with dlclose() will run all the exit handlers that dlclose() had not yet run, but then will block on the loader lock. The concurrent dlclose() will continue to run all the exit handlers again (twice) in violation of the Itanium C++ ABI requirements for __cxa_atexit(). This commit fixes this by having exit() mark all handlers with ef_free to ensure that concurrent dlclose() won't re-run registered exit handlers that have already run.
238 lines
8.6 KiB
Makefile
238 lines
8.6 KiB
Makefile
# Copyright (C) 1991-2017 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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#
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# Makefile for stdlib routines
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#
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subdir := stdlib
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include ../Makeconfig
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headers := stdlib.h bits/stdlib.h bits/stdlib-ldbl.h bits/stdlib-float.h \
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monetary.h bits/monetary-ldbl.h \
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inttypes.h stdint.h bits/wordsize.h \
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errno.h sys/errno.h bits/errno.h \
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ucontext.h sys/ucontext.h \
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alloca.h fmtmsg.h \
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bits/stdlib-bsearch.h sys/random.h bits/stdint-intn.h \
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bits/stdint-uintn.h
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routines := \
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atof atoi atol atoll \
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abort \
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bsearch qsort msort \
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getenv putenv setenv secure-getenv \
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exit on_exit atexit cxa_atexit cxa_finalize old_atexit \
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quick_exit at_quick_exit cxa_at_quick_exit cxa_thread_atexit_impl \
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abs labs llabs \
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div ldiv lldiv \
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mblen mbstowcs mbtowc wcstombs wctomb \
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random random_r rand rand_r \
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drand48 erand48 lrand48 nrand48 mrand48 jrand48 \
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srand48 seed48 lcong48 \
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drand48_r erand48_r lrand48_r nrand48_r mrand48_r jrand48_r \
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srand48_r seed48_r lcong48_r \
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drand48-iter getrandom getentropy \
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strfromf strfromd strfroml \
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strtol strtoul strtoll strtoull \
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strtol_l strtoul_l strtoll_l strtoull_l \
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strtof strtod strtold \
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strtof_l strtod_l strtold_l \
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strtof_nan strtod_nan strtold_nan \
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system canonicalize \
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a64l l64a \
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rpmatch strfmon strfmon_l getsubopt xpg_basename fmtmsg \
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strtoimax strtoumax wcstoimax wcstoumax \
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getcontext setcontext makecontext swapcontext
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aux = grouping groupingwc tens_in_limb
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# These routines will be omitted from the libc shared object.
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# Instead the static object files will be included in a special archive
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# linked against when the shared library will be used.
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static-only-routines = atexit at_quick_exit
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test-srcs := tst-fmtmsg
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tests := tst-strtol tst-strtod testmb testrand testsort testdiv \
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test-canon test-canon2 tst-strtoll tst-environ \
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tst-xpg-basename tst-random tst-random2 tst-bsearch \
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tst-limits tst-rand48 bug-strtod tst-setcontext \
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tst-setcontext2 test-a64l tst-qsort tst-system testmb2 \
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bug-strtod2 tst-atof1 tst-atof2 tst-strtod2 \
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tst-rand48-2 tst-makecontext tst-strtod5 \
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tst-qsort2 tst-makecontext2 tst-strtod6 tst-unsetenv1 \
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tst-makecontext3 bug-getcontext bug-fmtmsg1 \
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tst-secure-getenv tst-strtod-overflow tst-strtod-round \
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tst-tininess tst-strtod-underflow tst-setcontext3 \
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tst-strtol-locale tst-strtod-nan-locale tst-strfmon_l \
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tst-quick_exit tst-thread-quick_exit tst-width \
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tst-width-stdint tst-strfrom tst-strfrom-locale \
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tst-getrandom tst-atexit tst-at_quick_exit \
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tst-cxa_atexit tst-on_exit test-atexit-race \
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test-at_quick_exit-race test-cxa_atexit-race \
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test-on_exit-race test-dlclose-exit-race
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tests-internal := tst-strtod1i tst-strtod3 tst-strtod4 tst-strtod5i \
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tst-tls-atexit tst-tls-atexit-nodelete
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tests-static := tst-secure-getenv
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ifeq ($(build-hardcoded-path-in-tests),yes)
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tests += tst-empty-env
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endif
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LDLIBS-test-atexit-race = $(shared-thread-library)
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LDLIBS-test-at_quick_exit-race = $(shared-thread-library)
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LDLIBS-test-cxa_atexit-race = $(shared-thread-library)
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LDLIBS-test-on_exit-race = $(shared-thread-library)
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LDLIBS-test-dlclose-exit-race = $(shared-thread-library) $(libdl)
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LDFLAGS-test-dlclose-exit-race = $(LDFLAGS-rdynamic)
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LDLIBS-test-dlclose-exit-race-helper.so = $(libsupport) $(shared-thread-library)
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ifeq ($(have-cxx-thread_local),yes)
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CFLAGS-tst-quick_exit.o = -std=c++11
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LDLIBS-tst-quick_exit = -lstdc++
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CFLAGS-tst-thread-quick_exit.o = -std=c++11
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LDLIBS-tst-thread-quick_exit = -lstdc++
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$(objpfx)tst-thread-quick_exit: $(shared-thread-library)
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else
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tests-unsupported += tst-quick_exit tst-thread-quick_exit
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endif
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modules-names = tst-tls-atexit-lib test-dlclose-exit-race-helper
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extra-test-objs += $(addsuffix .os, $(modules-names))
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ifeq ($(build-shared),yes)
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tests += tst-putenv
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endif
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# Several mpn functions from GNU MP are used by the strtod function.
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mpn-routines := inlines add_n addmul_1 cmp divmod_1 divrem udiv_qrnnd \
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lshift rshift mod_1 mul mul_1 mul_n sub_n submul_1
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mpn-headers = longlong.h gmp.h gmp-impl.h gmp-mparam.h asm-syntax.h
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routines := $(strip $(routines) $(mpn-routines)) \
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dbl2mpn ldbl2mpn \
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mpn2flt mpn2dbl mpn2ldbl
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aux += fpioconst mp_clz_tab
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tests-extras += tst-putenvmod
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extra-test-objs += tst-putenvmod.os
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generated += isomac isomac.out tst-putenvmod.so
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CFLAGS-bsearch.c = $(uses-callbacks)
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CFLAGS-msort.c = $(uses-callbacks)
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CFLAGS-qsort.c = $(uses-callbacks)
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CFLAGS-system.c = -fexceptions
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CFLAGS-system.os = -fomit-frame-pointer
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CFLAGS-fmtmsg.c = -fexceptions
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CFLAGS-strfmon.c = $(libio-mtsafe)
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CFLAGS-strfmon_l.c = $(libio-mtsafe)
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# The strfrom class of functions call __printf_fp in order to convert the
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# floating-point value to characters. This requires the value of IO_MTSAFE_IO.
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CFLAGS-strfromd.c = $(libio-mtsafe)
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CFLAGS-strfromf.c = $(libio-mtsafe)
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CFLAGS-strfroml.c = $(libio-mtsafe)
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CFLAGS-tst-bsearch.c = $(stack-align-test-flags)
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CFLAGS-tst-qsort.c = $(stack-align-test-flags)
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CFLAGS-tst-makecontext.c += -funwind-tables
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CFLAGS-tst-makecontext2.c = $(stack-align-test-flags)
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# Run a test on the header files we use.
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tests-special += $(objpfx)isomac.out
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ifeq ($(run-built-tests),yes)
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tests-special += $(objpfx)tst-fmtmsg.out
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endif
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include ../Rules
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ifeq ($(run-built-tests),yes)
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LOCALES := cs_CZ.UTF-8 de_DE.UTF-8 en_US.ISO-8859-1 tr_TR.UTF-8 \
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tr_TR.ISO-8859-9 tg_TJ.UTF-8 hr_HR.UTF-8 hi_IN.UTF-8 \
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el_GR.UTF-8
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include ../gen-locales.mk
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$(objpfx)bug-strtod2.out: $(gen-locales)
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$(objpfx)testmb2.out: $(gen-locales)
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$(objpfx)tst-strtod.out: $(gen-locales)
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$(objpfx)tst-strtod3.out: $(gen-locales)
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$(objpfx)tst-strtod4.out: $(gen-locales)
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$(objpfx)tst-strtod5.out: $(gen-locales)
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$(objpfx)tst-strtol-locale.out: $(gen-locales)
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$(objpfx)tst-strtod-nan-locale.out: $(gen-locales)
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$(objpfx)tst-strfmon_l.out: $(gen-locales)
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$(objpfx)tst-strfrom.out: $(gen-locales)
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$(objpfx)tst-strfrom-locale.out: $(gen-locales)
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$(objpfx)test-dlclose-exit-race.out: $(objpfx)test-dlclose-exit-race-helper.so
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endif
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# Testdir has to be named stdlib and needs to be writable
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test-canon-ARGS = --test-dir=${common-objpfx}stdlib
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bug-fmtmsg1-ENV = SEV_LEVEL=foo,11,newsev
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$(objpfx)isomac.out: $(objpfx)isomac
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$(dir $<)$(notdir $<) '$(CC)' \
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'-I../include $(+sysdep-includes) $(sysincludes) -I..' > $@; \
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$(evaluate-test)
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isomac-CFLAGS = -O
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$(objpfx)isomac: isomac.c
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$(native-compile)
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$(objpfx)tst-fmtmsg.out: tst-fmtmsg.sh $(objpfx)tst-fmtmsg
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$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
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'$(run-program-env)' '$(test-program-prefix-after-env)' \
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$(common-objpfx)stdlib/ > $@; \
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$(evaluate-test)
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$(objpfx)tst-putenv: $(objpfx)tst-putenvmod.so
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LDFLAGS-tst-putenv = $(no-as-needed)
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$(objpfx)tst-putenvmod.so: $(objpfx)tst-putenvmod.os $(link-libc-deps)
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$(build-module)
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libof-tst-putenvmod = extramodules
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$(objpfx)bug-getcontext: $(libm)
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$(objpfx)bug-strtod2: $(libm)
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$(objpfx)tst-strtod-round: $(libm)
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$(objpfx)tst-tininess: $(libm)
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$(objpfx)tst-strtod-underflow: $(libm)
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$(objpfx)tst-strtod6: $(libm)
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$(objpfx)tst-strtod-nan-locale: $(libm)
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tst-tls-atexit-lib.so-no-z-defs = yes
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test-dlclose-exit-race-helper.so-no-z-defs = yes
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$(objpfx)tst-tls-atexit: $(shared-thread-library) $(libdl)
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$(objpfx)tst-tls-atexit.out: $(objpfx)tst-tls-atexit-lib.so
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$(objpfx)tst-tls-atexit-nodelete: $(shared-thread-library) $(libdl)
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$(objpfx)tst-tls-atexit-nodelete.out: $(objpfx)tst-tls-atexit-lib.so
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$(objpfx)tst-setcontext3.out: tst-setcontext3.sh $(objpfx)tst-setcontext3
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$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
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'$(run-program-env)' '$(test-program-prefix-after-env)' \
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$(common-objpfx)stdlib/ > $@; \
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$(evaluate-test)
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$(objpfx)tst-makecontext: $(libdl)
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