[libpng16] Fixed race conditions in parallel make builds. With higher degrees
of parallelism during 'make' the use of the same temporary file names such as 'dfn*' can result in a race where a temporary file from one arm of the build is deleted or overwritten in another arm. This changes the temporary files for suffix rules to always use $* and ensures that the non-suffix rules use unique file names.
This commit is contained in:
John Bowler
Glenn Randers-Pehrson
parent
90a87c8853
commit
eb26ee6602
10
ANNOUNCE
10
ANNOUNCE
@ -1,5 +1,5 @@
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Libpng 1.6.0alpha01 - December 5, 2011
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Libpng 1.6.0alpha01 - December 8, 2011
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This is not intended to be a public release. It will be replaced
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within a few weeks by a public version or by another test version.
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@ -107,7 +107,7 @@ Version 1.5.7beta05 [(PENDING RELEASE)]
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Added MINGW support to CMakeLists.txt
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Reject invalid compression flag or method when reading the iTXt chunk.
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Version 1.6.0alpha01 [December 5, 2011]
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Version 1.6.0alpha01 [December 8, 2011]
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Removed machine-generated configure files from the GIT repository (they will
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continue to appear in the tarball distributions).
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Restored the new 'simplified' API, which was deleted from libpng-1.5.7.
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@ -135,6 +135,12 @@ Version 1.6.0alpha01 [December 5, 2011]
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as in libpng-1.5.4.
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Put CRLF line endings in the owatcom project files.
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Fixed minor memset/sizeof errors in pngvalid.c.
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Fixed race conditions in parallel make builds. With higher degress of
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parallelism during 'make' the use of the same temporary file names such
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as 'dfn*' can result in a race where a temporary file from one arm of the
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build is deleted or overwritten in another arm. This changes the
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temporary files for suffix rules to always use $* and ensures that the
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non-suffix rules use unique file names.
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
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(subscription required; visit
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8
CHANGES
8
CHANGES
@ -3752,7 +3752,7 @@ Version 1.5.7beta05 [(PENDING RELEASE)]
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Added MINGW support to CMakeLists.txt
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Reject invalid compression flag or method when reading the iTXt chunk.
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Version 1.6.0alpha01 [December 5, 2011]
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Version 1.6.0alpha01 [December 8, 2011]
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Removed machine-generated configure files from the GIT repository (they will
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continue to appear in the tarball distributions).
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Restored the new 'simplified' API, which was deleted from libpng-1.5.7.
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@ -3780,6 +3780,12 @@ Version 1.6.0alpha01 [December 5, 2011]
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as in libpng-1.5.4.
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Put CRLF line endings in the owatcom project files.
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Fixed minor memset/sizeof errors in pngvalid.c.
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Fixed race conditions in parallel make builds. With higher degress of
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parallelism during 'make' the use of the same temporary file names such
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as 'dfn*' can result in a race where a temporary file from one arm of the
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build is deleted or overwritten in another arm. This changes the
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temporary files for suffix rules to always use $* and ensures that the
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non-suffix rules use unique file names.
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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(subscription required; visit
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46
Makefile.am
46
Makefile.am
@ -88,7 +88,7 @@ EXTRA_DIST= \
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SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk scripts/pnglibconf.dfn
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CLEANFILES= dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
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CLEANFILES= *.tf? pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
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libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
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check.new pnglibconf.* symbols.new pngtest-log.txt \
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$(SCRIPT_CLEANFILES)
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@ -143,47 +143,49 @@ SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
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-DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE
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.dfn.out:
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rm -f $@ dfn.c dfn?.out
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rm -f $@ $*.c $*.tf[123]
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test -d scripts || mkdir scripts
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echo '#include "$<"' >dfn.c
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echo '#include "$<"' >$*.c
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$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
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$(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
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$(CPPFLAGS) $(SYMBOL_CFLAGS) $*.c > $*.tf1
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$(SED) -n -e 's|^.*PNG_DEFN_MAGIC *-\(.*\)- *PNG_DEFN_END.*$$|\1|p'\
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dfn1.out >dfn2.out
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$(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' dfn2.out >dfn3.out
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rm -f dfn.c dfn[12].out
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mv dfn3.out $@
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$*.tf1 >$*.tf2
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$(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' $*.tf2 >$*.tf3
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rm -f $*.c $*.tf[12]
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mv $*.tf3 $@
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# The .dfn file for pnglibconf.h is machine generated
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pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
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rm -f $@ dfn?.out
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$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out version=search\
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rm -f $@ $*.tf[45]
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$(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf4 version=search\
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${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
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$(DFA_XTRA) 1>&2
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$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
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rm dfn1.out
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mv dfn2.out $@
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$(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf5 $*.tf4 1>&2
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rm $*.tf4
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mv $*.tf5 $@
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# Symbol checks (.def and .out files should match)
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scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out
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.out.chk:
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rm -f $@ symbols.new
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rm -f $@ $*.new
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$(AWK) -f ${srcdir}/scripts/checksym.awk ${srcdir}/scripts/${*F}.def\
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$< >&2
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mv symbols.new $@
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of="$*.new" $< >&2
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mv $*.new $@
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# used on demand to regenerate the standard header, CPPFLAGS should
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# be empty - no non-standard defines
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scripts/pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
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rm -f $@ dfn?.out
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rm -f $@ pnglibconf.tf[67]
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test -z "$(CPPFLAGS)"
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echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\
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$(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out logunsupported=1
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version=search ${srcdir}/pngconf.h -\
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$(AWK) -f ${srcdir}/scripts/options.awk out=pnglibconf.tf6\
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logunsupported=1 version=search ${srcdir}/pngconf.h -\
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${srcdir}/scripts/pnglibconf.dfa 1>&2
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$(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2
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rm dfn1.out
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mv dfn2.out $@
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$(AWK) -f ${srcdir}/scripts/options.awk out=pnglibconf.tf7\
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pnglibconf.tf6 1>&2
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rm pnglibconf.tf6
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mv pnglibconf.tf7 $@
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$(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
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pnglibconf.h pngpriv.h pngdebug.h pnginfo.h pngstruct.h
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@ -5,8 +5,9 @@
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# awk -f checksym.awk official-def list-to-check
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#
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# Output is a file in the current directory called 'symbols.new',
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# stdout holds error messages. Error code indicates success or
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# failure.
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# the value of the awk variable "of" (which can be changed on the
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# command line if required.) stdout holds error messages. Error
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# code indicates success or failure.
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#
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# NOTE: this is a pure, old fashioned, awk script. It will
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# work with any awk
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@ -21,6 +22,7 @@ BEGIN{
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mastero = 0 # highest ordinal in master file
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symbolo = 0 # highest ordinal in png.h
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missing = "error"# log an error on missing symbols
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of="symbols.new" # default to a fixed name
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}
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# Read existing definitions from the master file (the first
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@ -151,11 +153,11 @@ END{
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# Finally generate symbols.new
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if (symbol[o] != "")
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print " " symbol[o], "@" o > "symbols.new"
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print " " symbol[o], "@" o > of
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}
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if (err != 0) {
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print "*** A new list is in symbols.new ***"
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print "*** A new list is in", of, "***"
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exit 1
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}
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}
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