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IN NO EVENT SHALL THE # X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN # AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC- # TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # # Except as contained in this notice, the name of the X Consortium shall not # be used in advertising or otherwise to promote the sale, use or other deal- # ings in this Software without prior written authorization from the X Consor- # tium. # # # FSF changes to this file are in the public domain. # # Calling this script install-sh is preferred over install.sh, to prevent # 'make' implicit rules from creating a file called install from it # when there is no Makefile. # # This script is compatible with the BSD install script, but was written # from scratch. tab=' ' nl=' ' IFS=" $tab$nl" # Set DOITPROG to "echo" to test this script. doit=${DOITPROG-} doit_exec=${doit:-exec} # Put in absolute file names if you don't have them in your path; # or use environment vars. chgrpprog=${CHGRPPROG-chgrp} chmodprog=${CHMODPROG-chmod} chownprog=${CHOWNPROG-chown} cmpprog=${CMPPROG-cmp} cpprog=${CPPROG-cp} mkdirprog=${MKDIRPROG-mkdir} mvprog=${MVPROG-mv} rmprog=${RMPROG-rm} stripprog=${STRIPPROG-strip} posix_mkdir= # Desired mode of installed file. mode=0755 # Create dirs (including intermediate dirs) using mode 755. # This is like GNU 'install' as of coreutils 8.32 (2020). mkdir_umask=22 backupsuffix= chgrpcmd= chmodcmd=$chmodprog chowncmd= mvcmd=$mvprog rmcmd="$rmprog -f" stripcmd= src= dst= dir_arg= dst_arg= copy_on_change=false is_target_a_directory=possibly usage="\ Usage: $0 [OPTION]... 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(umask $cp_umask && { test -z "$stripcmd" || { # Create $dsttmp read-write so that cp doesn't create it read-only, # which would cause strip to fail. if test -z "$doit"; then : >"$dsttmp" # No need to fork-exec 'touch'. else $doit touch "$dsttmp" fi } } && $doit_exec $cpprog "$src" "$dsttmp") && # and set any options; do chmod last to preserve setuid bits. # # If any of these fail, we abort the whole thing. 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Don't worry if it fails, # e.g., if mv doesn't support -f. if test -n "$backupsuffix" && test -f "$dst"; then $doit $mvcmd -f "$dst" "$dst$backupsuffix" 2>/dev/null fi # Rename the file to the real destination. $doit $mvcmd -f "$dsttmp" "$dst" 2>/dev/null || # The rename failed, perhaps because mv can't rename something else # to itself, or perhaps because mv is so ancient that it does not # support -f. { # Now remove or move aside any old file at destination location. # We try this two ways since rm can't unlink itself on some # systems and the destination file might be busy for other # reasons. In this case, the final cleanup might fail but the new # file should still install successfully. { test ! -f "$dst" || $doit $rmcmd "$dst" 2>/dev/null || { $doit $mvcmd -f "$dst" "$rmtmp" 2>/dev/null && { $doit $rmcmd "$rmtmp" 2>/dev/null; :; } } || { echo "$0: cannot unlink or rename $dst" >&2 (exit 1); exit 1 } } && # Now rename the file to the real destination. $doit $mvcmd "$dsttmp" "$dst" } fi || exit 1 trap '' 0 fi done # Local variables: # eval: (add-hook 'before-save-hook 'time-stamp) # time-stamp-start: "scriptversion=" # time-stamp-format: "%:y-%02m-%02d.%02H" # time-stamp-time-zone: "UTC0" # time-stamp-end: "; # UTC" # End: libpthread-stubs-0.5/pthread-stubs.pc.in0000644014310600000120000000034414455575576015311 00000000000000Name: pthread stubs Description: Meta package for pthread symbols - defaults to heavyweight ones if the C runtime does not provide lightweight ones. Version: @PACKAGE_VERSION@ Cflags: @PKG_CONFIG_CFLAGS@ Libs: @PKG_CONFIG_LIBS@ libpthread-stubs-0.5/configure.ac0000644014310600000120000000170214455575576014060 00000000000000AC_INIT([libpthread-stubs], 0.5, [xcb@lists.freedesktop.org]) AC_CONFIG_SRCDIR([pthread-stubs.pc.in]) AM_INIT_AUTOMAKE([foreign dist-xz]) dnl Check if the following functions have stubs. dnl See the README for specifics about the list. funclist="\ pthread_condattr_destroy \ pthread_condattr_init \ pthread_cond_broadcast \ pthread_cond_destroy \ pthread_cond_init \ pthread_cond_signal \ pthread_cond_timedwait \ pthread_cond_wait \ pthread_equal \ pthread_exit \ pthread_mutex_destroy \ pthread_mutex_init \ pthread_mutex_lock \ pthread_mutex_unlock \ pthread_self" AC_CHECK_FUNCS($funclist, [], [HAVE_STUBS=no]) if test "x$HAVE_STUBS" != xno; then PKG_CONFIG_CFLAGS= PKG_CONFIG_LIBS= else dnl See the README why '-pthread' is deemed sufficient. PKG_CONFIG_CFLAGS="-pthread" PKG_CONFIG_LIBS="-pthread" fi AC_SUBST([PKG_CONFIG_CFLAGS]) AC_SUBST([PKG_CONFIG_LIBS]) AC_CONFIG_FILES([Makefile pthread-stubs.pc]) AC_OUTPUT libpthread-stubs-0.5/README0000644014310600000120000000660214455575576012456 00000000000000Project description ------------------- Currently the project provides only a pkg-config [.pc] file, pthread-stubs.pc. The latter contains the Cflags/Libs flags applicable to programs/libraries that use only lightweight pthread API. See the next sections for the reasoning and implementation details. Historically this project used to provide either: - a .pc file, when the C runtime was providing the pthread symbols or - a .pc file and a library which implements weak stubs for the pthread symbols, which are not available in the C runtime. Since then, the latter case was found to have a fundamental design issue. Design ------ On platforms where the lightweight pthread symbols are provided by the runtime, the .pc files provides empty Cflags/Libs flags. Currently the following platforms fit the above category: - GNU/Linux - GCC/Clang/GLibC/Musl - Solaris 10 and later - Cygwin - GNU/Hurd - GNU/kFreeBSD For others, each of Cflags/Libs expands to full blown pthread. For example: - FreeBSD and derivatives - OpenBSD - uses a heavily patched copy of pthread-stubs to workaround this - other BSD platforms ? Unchecked: - MSYS/MINGW - Darwin - GCC/Clang - should be the same as their Linux counter part Many platforms have their own eccentric way of managing pthread compilation and linkage. The ones realistically supported by pthread-stubs [and projects that depend on it] work with '-pthread'. GCC supports -pthread for: Aarch64, ARM, Darwin, IA-64, MIPS, PowerPC, SPARC, x86 Cygwin and x86 Windows may need a trivial patch for older GCC versions. See SVN rev 214161 and 171833/171834 respectively. Clang: Aarch64, ARM, x86 and likely others. SunCC/Oracle compiler: Requires -mt -lpthread. As of Solaris 10 (oldest currently supported version) all the pthread API lives in libc. Thus we'll _never_ get here. With previous design, one could get mismatched calls to the pthreads API. Consider the following scenario: - Program and/or its dependencies links only against libpthread-stubs, since it uses lightweight API. Say pthread_mutex_lock. - At a later stage the program and/or its dependencies dlopens a library which effectively [either directly or via any of its own dependencies] pulls a full blown pthread. Let's call that libB. - The libpthread-stubs weak symbols get overridden by the libB ones. - pthread_mutex_unlock is executed (which now originates from libB) and BOOM. Amount and severity of issues depend on a number of factors. In either case things go horribly wrong sooner on later. The symbols ----------- The following list of symbols is taken from the libc provided by GLibC. It is deemed sufficient and reasonably accurate of what the 'lightweight' pthread symbols are, since GLibC is one of the few (the only) implementations which has the distinct split. Most/all other C runtime implementations provide all the pthread API in a single library. Note that the following list is incomplete wrt libc-2.24.so and that further symbols may be added in the future to bring the two closer. Adding symbols which are not available in GLibC libc is NOT allowed. pthread_condattr_destroy pthread_condattr_init pthread_cond_broadcast pthread_cond_destroy pthread_cond_init pthread_cond_signal pthread_cond_timedwait pthread_cond_wait pthread_equal pthread_exit pthread_mutex_destroy pthread_mutex_init pthread_mutex_lock pthread_mutex_unlock pthread_self libpthread-stubs-0.5/configure0000755014310600000120000047567714455575602013521 00000000000000#! /bin/sh # Guess values for system-dependent variables and create Makefiles. # Generated by GNU Autoconf 2.71 for libpthread-stubs 0.5. # # Report bugs to . # # # Copyright (C) 1992-1996, 1998-2017, 2020-2021 Free Software Foundation, # Inc. # # # This configure script is free software; the Free Software Foundation # gives unlimited permission to copy, distribute and modify it. ## -------------------- ## ## M4sh Initialization. ## ## -------------------- ## # Be more Bourne compatible DUALCASE=1; export DUALCASE # for MKS sh as_nop=: if test ${ZSH_VERSION+y} && (emulate sh) >/dev/null 2>&1 then : emulate sh NULLCMD=: # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which # is contrary to our usage. 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