pax_global_header00006660000000000000000000000064122453045100014506gustar00rootroot0000000000000052 comment=e8dd66fee206f93e1bee059bdadde064901ed745 libxshmfence-1.1/000075500000000000000000000000001224530451000140145ustar00rootroot00000000000000libxshmfence-1.1/.gitignore000064400000000000000000000021471224530451000160100ustar00rootroot00000000000000# # X.Org module default exclusion patterns # The next section if for module specific patterns # # Do not edit the following section # GNU Build System (Autotools) aclocal.m4 autom4te.cache/ autoscan.log ChangeLog compile config.guess config.h config.h.in config.log config-ml.in config.py config.status config.status.lineno config.sub configure configure.scan depcomp .deps/ INSTALL install-sh .libs/ libtool libtool.m4 ltmain.sh lt~obsolete.m4 ltoptions.m4 ltsugar.m4 ltversion.m4 Makefile Makefile.in mdate-sh missing mkinstalldirs *.pc py-compile stamp-h? symlink-tree texinfo.tex ylwrap # Do not edit the following section # Edit Compile Debug Document Distribute *~ *.[0-9] *.[0-9]x *.bak *.bin core *.dll *.exe *-ISO*.bdf *-JIS*.bdf *-KOI8*.bdf *.kld *.ko *.ko.cmd *.lai *.l[oa] *.[oa] *.obj *.patch *.so *.pcf.gz *.pdb *.tar.bz2 *.tar.gz # # Add & Override patterns for libxshmfence # # Edit the following section as needed # For example, !report.pc overrides *.pc. See 'man gitignore' # libxshmfence-*.announce test-driver test/test-suite.log test/xshmfence_test test/xshmfence_test.log test/xshmfence_test.trs libxshmfence-1.1/COPYING000064400000000000000000000021501224530451000150450ustar00rootroot00000000000000Copyright © 2013 Keith Packard Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of the copyright holders not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. The copyright holders make no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty. THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. libxshmfence-1.1/Makefile.am000064400000000000000000000026641224530451000160600ustar00rootroot00000000000000# # Copyright © 2013 Keith Packard # # Permission to use, copy, modify, distribute, and sell this software and its # documentation for any purpose is hereby granted without fee, provided that # the above copyright notice appear in all copies and that both that copyright # notice and this permission notice appear in supporting documentation, and # that the name of the copyright holders not be used in advertising or # publicity pertaining to distribution of the software without specific, # written prior permission. The copyright holders make no representations # about the suitability of this software for any purpose. It is provided "as # is" without express or implied warranty. # # THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, # INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO # EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR # CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, # DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER # TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE # OF THIS SOFTWARE. # SUBDIRS = src test pkgconfigdir = $(libdir)/pkgconfig pkgconfig_DATA = xshmfence.pc EXTRA_DIST = xshmfence.pc.in ChangeLog MAINTAINERCLEANFILES = ChangeLog .PHONY: ChangeLog ChangeLog: $(CHANGELOG_CMD) dist-hook: ChangeLog if LINT lint: (cd src && $(MAKE) $(MFLAGS) lint) endif LINT libxshmfence-1.1/README000064400000000000000000000020211224530451000146670ustar00rootroot00000000000000libxshmfence - Shared memory 'SyncFence' synchronization primitive This library offers a CPU-based synchronization primitive compatible with the X SyncFence objects that can be shared between processes using file descriptor passing. There are two underlying implementations: 1) On Linux, the library uses futexes 2) On other systems, the library uses posix mutexes and condition variables. All questions regarding this software should be directed at the Xorg mailing list: http://lists.freedesktop.org/mailman/listinfo/xorg Please submit bug reports to the Xorg bugzilla: https://bugs.freedesktop.org/enter_bug.cgi?product=xorg The master development code repository can be found at: git://anongit.freedesktop.org/git/xorg/lib/libxshmfence http://cgit.freedesktop.org/xorg/lib/libxshmfence For patch submission instructions, see: http://www.x.org/wiki/Development/Documentation/SubmittingPatches For more information on the git code manager, see: http://wiki.x.org/wiki/GitPage libxshmfence-1.1/autogen.sh000075500000000000000000000003031224530451000160110ustar00rootroot00000000000000#! /bin/sh srcdir=`dirname $0` test -z "$srcdir" && srcdir=. ORIGDIR=`pwd` cd $srcdir autoreconf -v --install || exit 1 cd $ORIGDIR || exit $? $srcdir/configure --enable-maintainer-mode "$@" libxshmfence-1.1/configure.ac000064400000000000000000000113351224530451000163050ustar00rootroot00000000000000dnl dnl Copyright © 2013 Keith Packard dnl dnl Permission to use, copy, modify, distribute, and sell this software and its dnl documentation for any purpose is hereby granted without fee, provided that dnl the above copyright notice appear in all copies and that both that copyright dnl notice and this permission notice appear in supporting documentation, and dnl that the name of the copyright holders not be used in advertising or dnl publicity pertaining to distribution of the software without specific, dnl written prior permission. The copyright holders make no representations dnl about the suitability of this software for any purpose. It is provided "as dnl is" without express or implied warranty. dnl dnl THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, dnl INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO dnl EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR dnl CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, dnl DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER dnl TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE dnl OF THIS SOFTWARE. dnl dnl dnl Process this file with autoconf to create configure. AC_PREREQ([2.60]) AC_INIT([libxshmfence], [1.1], [https://bugs.freedesktop.org/enter_bug.cgi?product=xorg], [libxshmfence]) AC_CONFIG_SRCDIR([Makefile.am]) AC_CONFIG_HEADERS([config.h]) # Initialize Automake AM_INIT_AUTOMAKE([foreign dist-bzip2]) AM_MAINTAINER_MODE # Initialize libtool AC_PROG_LIBTOOL # Require xorg-macros: XORG_DEFAULT_OPTIONS, XORG_WITH_LINT m4_ifndef([XORG_MACROS_VERSION], [m4_fatal([must install xorg-macros 1.3 or later before running autoconf/autogen])]) XORG_MACROS_VERSION(1.3) XORG_DEFAULT_OPTIONS dnl Allow checking code with lint, sparse, etc. XORG_WITH_LINT LINT_FLAGS="${LINT_FLAGS} ${FONTENC_CFLAGS}" dnl dnl Locate a suitable tmp file system for creating shared memeory files dnl AC_ARG_ENABLE(futex, AS_HELP_STRING([--enable-futex], [Enable futexes (default: auto)]), [FUTEX=$enableval], [FUTEX=auto]) if test "x$FUTEX" = "xauto"; then AC_CHECK_HEADER([linux/futex.h], [FUTEX=yes], [FUTEX=no]) fi if test "x$FUTEX" = "xyes"; then PTHREAD=no AC_DEFINE(HAVE_FUTEX,1,[Use futexes]) else PTHREAD=yes AC_DEFINE(HAVE_PTHREAD,1,[Use pthread primitives]) fi PTHREAD_LIBS= if test "x$PTHREAD" = "xyes"; then AC_CHECK_LIB(pthread,pthread_create,[PTHREAD_LIBS=-lpthread],[PTHREAD_LIBS=]) fi AC_SUBST([PTHREAD_LIBS]) AM_CONDITIONAL([FUTEX], [test x"$FUTEX" = xyes]) AM_CONDITIONAL([PTHREAD], [test x"$PTHREAD" = xyes]) PKG_CHECK_MODULES(XPROTO, xproto) AC_SUBST([XPROTO_CFLAGS]) CFLAGS="$CFLAGS $XPROTO_CFLAGS" AC_ARG_ENABLE(visibility, AC_HELP_STRING([--enable-visibility], [Enable symbol visibility (default: auto)]), [SYMBOL_VISIBILITY=$enableval], [SYMBOL_VISIBILITY=auto]) dnl ================================================================== dnl symbol visibility symbol_visibility= have_visibility=disabled if test x$SYMBOL_VISIBILITY != xno; then AC_MSG_CHECKING(for symbol visibility support) if test x$GCC = xyes; then VISIBILITY_CFLAGS="-fvisibility=hidden" else if test x$SUNCC = xyes; then VISIBILITY_CFLAGS="-xldscope=hidden" else have_visibility=no fi fi if test x$have_visibility != xno; then AC_TRY_COMPILE( [#include extern _X_HIDDEN int hidden_int; extern _X_EXPORT int public_int; extern _X_HIDDEN int hidden_int_func(void); extern _X_EXPORT int public_int_func(void);], [], have_visibility=yes, have_visibility=no) fi AC_MSG_RESULT([$have_visibility]) if test x$have_visibility != xno; then symbol_visibility=$VISIBILITY_CFLAGS CFLAGS="$CFLAGS $VISIBILITY_CFLAGS" fi fi AC_ARG_WITH(shared-memory-dir, AS_HELP_STRING([--with-shared-memory-dir=PATH], [Path to directory in a world-writable temporary directory for anonymous shared memory (default: auto)]), [], [with_shared_memory_dir=yes]) shmdirs="/run/shm /var/tmp /tmp" case x"$with_shared_memory_dir" in xyes) for dir in $shmdirs; do case x"$with_shared_memory_dir" in xyes) echo Checking temp dir "$dir" if test -d "$dir"; then with_shared_memory_dir="$dir" fi ;; esac done ;; x/*) ;; xno) ;; *) AC_MSG_ERROR([Invalid directory specified for --with-shared-memory-dir: $with_shared_memory_dir]) ;; esac case x"$with_shared_memory_dir" in xyes) AC_MSG_ERROR([No directory found for shared memory temp files.]) ;; xno) ;; *) AC_DEFINE_UNQUOTED(SHMDIR, ["$with_shared_memory_dir"], [Directory for shared memory temp files]) ;; esac AC_CONFIG_FILES([Makefile src/Makefile test/Makefile xshmfence.pc]) AC_OUTPUT libxshmfence-1.1/src/000075500000000000000000000000001224530451000146035ustar00rootroot00000000000000libxshmfence-1.1/src/Makefile.am000064400000000000000000000012571224530451000166440ustar00rootroot00000000000000lib_LTLIBRARIES = libxshmfence.la if PTHREAD PTHREAD_SOURCES=xshmfence_pthread.c xshmfence_pthread.h endif if FUTEX FUTEX_SOURCES=xshmfence_futex.c xshmfence_futex.h endif libxshmfence_la_SOURCES = \ xshmfenceint.h \ xshmfence_alloc.c \ $(PTHREAD_SOURCES) \ $(FUTEX_SOURCES) AM_CFLAGS = $(CWARNFLAGS) libxshmfence_la_LDFLAGS = -version-number 1:0:0 -no-undefined libxshmfence_la_LIBADD = @PTHREAD_LIBS@ libxshmfenceincludedir = $(includedir)/X11 libxshmfenceinclude_HEADERS = xshmfence.h if LINT ALL_LINT_FLAGS=$(LINT_FLAGS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \ $(AM_CPPFLAGS) $(CPPFLAGS) lint: $(LINT) $(ALL_LINT_FLAGS) $(libxshmfence_la_SOURCES) $(LIBS) endif LINT libxshmfence-1.1/src/xshmfence.h000064400000000000000000000032671224530451000167440ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #ifndef _XSHMFENCE_H_ #define _XSHMFENCE_H_ #include #define HAVE_STRUCT_XSHMFENCE 1 struct xshmfence; _X_EXPORT int xshmfence_trigger(struct xshmfence *f); _X_EXPORT int xshmfence_await(struct xshmfence *f); _X_EXPORT int xshmfence_query(struct xshmfence *f); _X_EXPORT void xshmfence_reset(struct xshmfence *f); _X_EXPORT int xshmfence_alloc_shm(void); _X_EXPORT struct xshmfence * xshmfence_map_shm(int fd); _X_EXPORT void xshmfence_unmap_shm(struct xshmfence *f); #endif /* _XSHMFENCE_H_ */ libxshmfence-1.1/src/xshmfence_alloc.c000064400000000000000000000046451224530451000201120ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #if HAVE_CONFIG_H #include "config.h" #endif #include "xshmfenceint.h" /** * xshmfence_alloc_shm: * * Allocates a shared memory object large enough to hold a single * fence. * * Return value: the file descriptor of the object, or -1 on failure * (in which case, errno will be set as appropriate). **/ int xshmfence_alloc_shm(void) { char template[] = SHMDIR "/shmfd-XXXXXX"; int fd; #ifdef O_TMPFILE fd = open(SHMDIR, O_TMPFILE|O_RDWR|O_CLOEXEC|O_EXCL, 0666); if (fd < 0) #endif { fd = mkstemp(template); if (fd < 0) return fd; unlink(template); } ftruncate(fd, sizeof (struct xshmfence)); xshmfence_init(fd); return fd; } /** * xshmfence_map_shm: * * Map a shared memory fence referenced by @fd. * * Return value: the fence or NULL (in which case, errno will be set * as appropriate). **/ struct xshmfence * xshmfence_map_shm(int fd) { struct xshmfence *addr; addr = mmap (NULL, sizeof (struct xshmfence) , PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); if (addr == MAP_FAILED) { close (fd); return 0; } return addr; } /** * xshmfence_unmap_shm: * * Unap a shared memory fence @f. **/ void xshmfence_unmap_shm(struct xshmfence *f) { munmap(f, sizeof (struct xshmfence)); } libxshmfence-1.1/src/xshmfence_futex.c000064400000000000000000000047201224530451000201450ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #if HAVE_CONFIG_H #include "config.h" #endif #include "xshmfenceint.h" /** * xshmfence_trigger: * @f: An X fence * * Set @f to triggered, waking all waiters. * * Return value: 0 on success and -1 on error (in which case, errno * will be set as appropriate). **/ int xshmfence_trigger(struct xshmfence *f) { if (__sync_val_compare_and_swap(&f->v, 0, 1) == -1) { atomic_store(&f->v, 1); if (futex_wake(&f->v) < 0) return -1; } return 0; } /** * xshmfence_await: * @f: An X fence * * Wait for @f to be triggered. If @f is already triggered, this * function returns immediately. * * Return value: 0 on success and -1 on error (in which case, errno * will be set as appropriate). **/ int xshmfence_await(struct xshmfence *f) { while (__sync_val_compare_and_swap(&f->v, 0, -1) != 1) { if (futex_wait(&f->v, -1)) { if (errno != EWOULDBLOCK) return -1; } } return 0; } /** * xshmfence_query: * @f: An X fence * * Return value: 1 if @f is triggered, else returns 0. **/ int xshmfence_query(struct xshmfence *f) { return atomic_fetch(&f->v) == 1; } /** * xshmfence_reset: * @f: An X fence * * Reset @f to untriggered. If @f is already untriggered, * this function has no effect. **/ void xshmfence_reset(struct xshmfence *f) { __sync_bool_compare_and_swap(&f->v, 1, 0); } libxshmfence-1.1/src/xshmfence_futex.h000064400000000000000000000041531224530451000201520ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #ifndef _XSHMFENCE_FUTEX_H_ #define _XSHMFENCE_FUTEX_H_ #include #include #include #include #include #include static inline long sys_futex(void *addr1, int op, int val1, struct timespec *timeout, void *addr2, int val3) { return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3); } static inline int futex_wake(int32_t *addr) { return sys_futex(addr, FUTEX_WAKE, MAXINT, NULL, NULL, 0); } static inline int futex_wait(int32_t *addr, int32_t value) { return sys_futex(addr, FUTEX_WAIT, value, NULL, NULL, 0); } #define barrier() __asm__ __volatile__("": : :"memory") static inline void atomic_store(int32_t *f, int32_t v) { barrier(); *f = v; barrier(); } static inline int32_t atomic_fetch(int32_t *a) { int32_t v; barrier(); v = *a; barrier(); return v; } struct xshmfence { int32_t v; }; #define xshmfence_init(fd) #endif /* _XSHMFENCE_FUTEX_H_ */ libxshmfence-1.1/src/xshmfence_pthread.c000064400000000000000000000066151224530451000204460ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #if HAVE_CONFIG_H #include "config.h" #endif #include "xshmfenceint.h" /** * xshmfence_trigger: * @f: An X fence * * Set @f to triggered, waking all waiters. * * Return value: 0 on success and -1 on error (in which case, errno * will be set as appropriate). **/ int xshmfence_trigger(struct xshmfence *f) { pthread_mutex_lock(&f->lock); if (f->value == 0) { f->value = 1; if (f->waiting) { f->waiting = 0; pthread_cond_broadcast(&f->wakeup); } } pthread_mutex_unlock(&f->lock); return 0; } /** * xshmfence_await: * @f: An X fence * * Wait for @f to be triggered. If @f is already triggered, this * function returns immediately. * * Return value: 0 on success and -1 on error (in which case, errno * will be set as appropriate). **/ int xshmfence_await(struct xshmfence *f) { pthread_mutex_lock(&f->lock); while (f->value == 0) { f->waiting = 1; pthread_cond_wait(&f->wakeup, &f->lock); } pthread_mutex_unlock(&f->lock); return 0; } /** * xshmfence_query: * @f: An X fence * * Return value: 1 if @f is triggered, else returns 0. **/ int xshmfence_query(struct xshmfence *f) { int value; pthread_mutex_lock(&f->lock); value = f->value; pthread_mutex_unlock(&f->lock); return value; } /** * xshmfence_reset: * @f: An X fence * * Reset @f to untriggered. If @f is already untriggered, * this function has no effect. **/ void xshmfence_reset(struct xshmfence *f) { pthread_mutex_lock(&f->lock); f->value = 0; pthread_mutex_unlock(&f->lock); } /** * xshmfence_init: * @fd: An fd for an X fence * * Initialize the fence when first allocated **/ void xshmfence_init(int fd) { struct xshmfence *f = xshmfence_map_shm(fd); pthread_mutexattr_t mutex_attr; pthread_condattr_t cond_attr; if (!f) return; pthread_mutexattr_init(&mutex_attr); pthread_mutexattr_setpshared(&mutex_attr, PTHREAD_PROCESS_SHARED); pthread_mutex_init(&f->lock, &mutex_attr); pthread_condattr_init(&cond_attr); pthread_condattr_setpshared(&cond_attr, PTHREAD_PROCESS_SHARED); pthread_cond_init(&f->wakeup, &cond_attr); f->value = 0; f->waiting = 0; xshmfence_unmap_shm(f); } libxshmfence-1.1/src/xshmfence_pthread.h000064400000000000000000000027271224530451000204530ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #ifndef _XSHMFENCE_PTHREAD_H_ #define _XSHMFENCE_PTHREAD_H_ #include #include struct xshmfence { pthread_mutex_t lock; pthread_cond_t wakeup; int value; int waiting; }; void xshmfence_init(int fd); #endif /* _XSHMFENCE_PTHREAD_H_ */ libxshmfence-1.1/src/xshmfenceint.h000064400000000000000000000026721224530451000174560ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #ifndef _XSHMFENCEINT_H_ #define _XSHMFENCEINT_H_ #include #include #include #include "xshmfence.h" #if HAVE_FUTEX #include "xshmfence_futex.h" #endif #if HAVE_PTHREAD #include "xshmfence_pthread.h" #endif #endif /* _XSHMFENCEINT_H_ */ libxshmfence-1.1/test/000075500000000000000000000000001224530451000147735ustar00rootroot00000000000000libxshmfence-1.1/test/Makefile.am000064400000000000000000000003341224530451000170270ustar00rootroot00000000000000check_PROGRAMS = xshmfence_test TESTS=$(check_PROGRAMS) xshmfence_test_SOURCES = xshmfence_test.c xshmfence_test_CFLAGS = -I$(top_srcdir)/src xshmfence_test_LDADD = $(top_builddir)/src/libxshmfence.la @PTHREAD_LIBS@ libxshmfence-1.1/test/xshmfence_test.c000064400000000000000000000115021224530451000201550ustar00rootroot00000000000000/* * Copyright © 2013 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #define NCHILD 5 /* number of child processes to fork */ #define NCHECK 10 /* number of times to signal the fence */ /* Catch an alarm and bail */ static void sigalrm(int sig) { write(2, "caught alarm\n", 13); exit(1); } int main(int argc, char **argv) { int fd; struct xshmfence *x; int i; int c; int pid; int status; int failed = 0; /* Allocate a fence */ fd = xshmfence_alloc_shm(); if (fd < 0) { perror("xshmfence_alloc_shm"); exit(1); } /* fork NCHILD processes to wait for the fence */ for (c = 0; c < NCHILD; c++) { switch (fork()) { case -1: perror("fork"); exit(1); case 0: /* Set an alarm to limit how long * to wait */ signal(SIGALRM, sigalrm); alarm(10); /* Map the fence */ x = xshmfence_map_shm(fd); if (!x) { fprintf(stderr, "%6d: ", c); perror("xshmfence_map_shm"); exit(1); } for (i = 0; i < NCHECK; i++) { /* Verify that the fence is currently reset */ if (xshmfence_query(x) != 0) { fprintf(stderr, "%6d: query reset failed\n", c); exit(1); } /* Wait for the fence */ fprintf(stderr, "%6d: waiting\n", c); if (xshmfence_await(x) < 0) { fprintf(stderr, "%6d: ", c); perror("xshmfence_await"); exit(1); } fprintf(stderr, "%6d: awoken\n", c); /* Verify that the fence is currently triggered */ if (xshmfence_query(x) == 0) { fprintf(stderr, "%6d: query triggered failed\n", c); exit(1); } usleep(10 * 1000); /* Reset the fence */ if (c == 0) xshmfence_reset(x); usleep(10 * 1000); } fprintf(stderr, "%6d: done\n", c); exit(0); } } /* Map the fence into the parent process */ x = xshmfence_map_shm(fd); if (!x) { perror("xshmfence_map_shm"); exit(1); } for (i = 0; i < NCHECK; i++) { usleep(100 * 1000); fprintf(stderr, "trigger\n"); /* Verify that the fence is reset */ if (xshmfence_query(x) != 0) { fprintf(stderr, "query reset failed\n"); exit(1); } /* Trigger the fence */ if (xshmfence_trigger(x) < 0) { perror("xshmfence_trigger"); exit(1); } /* Verify that the fence is triggered */ if (xshmfence_query(x) == 0) { fprintf (stderr, "query triggered failed\n"); exit(1); } fprintf(stderr, "trigger done\n"); } /* Reap all of the child processes */ for (c = 0; c < NCHILD; c++) { pid = wait(&status); if (pid < 0) { perror("wait"); exit(1); } fprintf(stderr, "child %d done %d\n", pid, status); if (status) failed++; } exit(failed); } libxshmfence-1.1/xshmfence.pc.in000064400000000000000000000004201224530451000167210ustar00rootroot00000000000000prefix=@prefix@ exec_prefix=@exec_prefix@ libdir=@libdir@ includedir=@includedir@ Name: xshmfence Description: The X Shared Memory Fence Library Version: @PACKAGE_VERSION@ Cflags: -I${includedir} @XPROTO_CFLAGS@ Libs: -L${libdir} -lxshmfence Libs.private: @PTHREAD_LIBS@