Re: [FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
On Thu, 30 Nov 2017 15:44:19 +0100 Hendrik Leppkeswrote: > On Thu, Nov 30, 2017 at 3:29 PM, Hendrik Leppkes wrote: > > On Thu, Nov 30, 2017 at 3:17 PM, Michael Niedermayer > > wrote: > >> On Thu, Nov 30, 2017 at 11:55:03AM +, Rostislav Pehlivanov wrote: > >>> On 28 November 2017 at 01:26, Michael Niedermayer > >>> wrote: > >>> > >>> > On Mon, Nov 27, 2017 at 04:30:18AM +, Rostislav Pehlivanov wrote: > >>> > > Signed-off-by: Rostislav Pehlivanov > >>> > > --- > >>> > > libavcodec/parser.c | 14 -- > >>> > > 1 file changed, 8 insertions(+), 6 deletions(-) > >>> > > > >>> > > diff --git a/libavcodec/parser.c b/libavcodec/parser.c > >>> > > index 670680ea7c..baf1de4d88 100644 > >>> > > --- a/libavcodec/parser.c > >>> > > +++ b/libavcodec/parser.c > >>> > > @@ -23,30 +23,32 @@ > >>> > > #include > >>> > > #include > >>> > > #include > >>> > > +#include > >>> > > > >>> > > #include "libavutil/avassert.h" > >>> > > -#include "libavutil/atomic.h" > >>> > > #include "libavutil/internal.h" > >>> > > #include "libavutil/mem.h" > >>> > > > >>> > > #include "internal.h" > >>> > > #include "parser.h" > >>> > > > >>> > > -static AVCodecParser *av_first_parser = NULL; > >>> > > +static _Atomic(AVCodecParser *)av_first_parser = NULL; > >>> > > >>> > This doesnt build here > >>> > > >>> > libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ > >>> > [enabled > >>> > by default] > >>> > static _Atomic(AVCodecParser *)av_first_parser = NULL; > >>> > ^ > >>> > libavcodec/parser.c: In function ‘_Atomic’: > >>> > libavcodec/parser.c:35:32: error: expected declaration specifiers before > >>> > ‘av_first_parser’ > >>> > static _Atomic(AVCodecParser *)av_first_parser = NULL; > >>> > ^ > >>> > libavcodec/parser.c:38:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > >>> > ‘__attribute__’ before ‘{’ token > >>> > { > >>> > ^ > >>> > libavcodec/parser.c:46:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > >>> > ‘__attribute__’ before ‘{’ token > >>> > { > >>> > ^ > >>> > libavcodec/parser.c:55:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__a > >>> > > >>> > > >>> > [...] > >>> > -- > >>> > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > >>> > > >>> > Observe your enemies, for they first find out your faults. -- > >>> > Antisthenes > >>> > > >>> > ___ > >>> > ffmpeg-devel mailing list > >>> > ffmpeg-devel@ffmpeg.org > >>> > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >>> > > >>> > > >>> > >>> Does the attached patch work? > >> > >>> parser.c | 14 -- > >>> 1 file changed, 8 insertions(+), 6 deletions(-) > >>> 71f66a37fb46e29626f27da4658f34927e48033c > >>> v2-0001-lavc-parser-use-C11-atomics.patch > >>> From b9ed59e9aff4a0fcc40f444f307c87acad55e139 Mon Sep 17 00:00:00 2001 > >>> From: Rostislav Pehlivanov > >>> Date: Mon, 27 Nov 2017 01:56:41 + > >>> Subject: [PATCH v2 1/2] lavc/parser: use C11 atomics > >>> > >>> Signed-off-by: Rostislav Pehlivanov > >>> --- > >>> libavcodec/parser.c | 14 -- > >>> 1 file changed, 8 insertions(+), 6 deletions(-) > >>> > >>> diff --git a/libavcodec/parser.c b/libavcodec/parser.c > >>> index 670680ea7c..d6df62bf70 100644 > >>> --- a/libavcodec/parser.c > >>> +++ b/libavcodec/parser.c > >>> @@ -23,30 +23,32 @@ > >>> #include > >>> #include > >>> #include > >>> +#include > >>> > >>> #include "libavutil/avassert.h" > >>> -#include "libavutil/atomic.h" > >>> #include "libavutil/internal.h" > >>> #include "libavutil/mem.h" > >>> > >>> #include "internal.h" > >>> #include "parser.h" > >>> > >>> -static AVCodecParser *av_first_parser = NULL; > >>> +static _Atomic(AVCodecParser *) av_first_parser = NULL; > >> > >> no > >> > >> > >> libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled > >> by default] > >> static _Atomic(AVCodecParser *) av_first_parser = NULL; > >> ^ > >> libavcodec/parser.c: In function ‘_Atomic’: > >> libavcodec/parser.c:35:33: error: expected declaration specifiers before > >> ‘av_first_parser’ > >> static _Atomic(AVCodecParser *) av_first_parser = NULL; > >> > >> also see > >> compat/atomics/gcc/stdatomic.h > >> > >> i think what you do is not supportd in that > >> > >> > > > > _Atomic is a keywork like volatile, so its syntax should be the same. > > Perhaps those emulations should just define it to "volatile" if its > > missing - the win32 emulation certainly would expect it to be > > volatile, and I would expect this to be true for the others as well. > > > > On that note, it seems a bit odd that the emulations don't typedef the > atomic types to be volatile. We replace "volatile int" with > "atomic_int" for example, and with win32 or gcc emulation for > stdatomic.h, the
Re: [FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
On 11/30/2017 11:44 AM, Hendrik Leppkes wrote: > On Thu, Nov 30, 2017 at 3:29 PM, Hendrik Leppkeswrote: >> On Thu, Nov 30, 2017 at 3:17 PM, Michael Niedermayer >> wrote: >>> On Thu, Nov 30, 2017 at 11:55:03AM +, Rostislav Pehlivanov wrote: On 28 November 2017 at 01:26, Michael Niedermayer wrote: > On Mon, Nov 27, 2017 at 04:30:18AM +, Rostislav Pehlivanov wrote: >> Signed-off-by: Rostislav Pehlivanov >> --- >> libavcodec/parser.c | 14 -- >> 1 file changed, 8 insertions(+), 6 deletions(-) >> >> diff --git a/libavcodec/parser.c b/libavcodec/parser.c >> index 670680ea7c..baf1de4d88 100644 >> --- a/libavcodec/parser.c >> +++ b/libavcodec/parser.c >> @@ -23,30 +23,32 @@ >> #include >> #include >> #include >> +#include >> >> #include "libavutil/avassert.h" >> -#include "libavutil/atomic.h" >> #include "libavutil/internal.h" >> #include "libavutil/mem.h" >> >> #include "internal.h" >> #include "parser.h" >> >> -static AVCodecParser *av_first_parser = NULL; >> +static _Atomic(AVCodecParser *)av_first_parser = NULL; > > This doesnt build here > > libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled > by default] > static _Atomic(AVCodecParser *)av_first_parser = NULL; > ^ > libavcodec/parser.c: In function ‘_Atomic’: > libavcodec/parser.c:35:32: error: expected declaration specifiers before > ‘av_first_parser’ > static _Atomic(AVCodecParser *)av_first_parser = NULL; > ^ > libavcodec/parser.c:38:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > ‘__attribute__’ before ‘{’ token > { > ^ > libavcodec/parser.c:46:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > ‘__attribute__’ before ‘{’ token > { > ^ > libavcodec/parser.c:55:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__a > > > [...] > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > Observe your enemies, for they first find out your faults. -- Antisthenes > > ___ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > Does the attached patch work? >>> parser.c | 14 -- 1 file changed, 8 insertions(+), 6 deletions(-) 71f66a37fb46e29626f27da4658f34927e48033c v2-0001-lavc-parser-use-C11-atomics.patch From b9ed59e9aff4a0fcc40f444f307c87acad55e139 Mon Sep 17 00:00:00 2001 From: Rostislav Pehlivanov Date: Mon, 27 Nov 2017 01:56:41 + Subject: [PATCH v2 1/2] lavc/parser: use C11 atomics Signed-off-by: Rostislav Pehlivanov --- libavcodec/parser.c | 14 -- 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/libavcodec/parser.c b/libavcodec/parser.c index 670680ea7c..d6df62bf70 100644 --- a/libavcodec/parser.c +++ b/libavcodec/parser.c @@ -23,30 +23,32 @@ #include #include #include +#include #include "libavutil/avassert.h" -#include "libavutil/atomic.h" #include "libavutil/internal.h" #include "libavutil/mem.h" #include "internal.h" #include "parser.h" -static AVCodecParser *av_first_parser = NULL; +static _Atomic(AVCodecParser *) av_first_parser = NULL; >>> >>> no >>> >>> >>> libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled >>> by default] >>> static _Atomic(AVCodecParser *) av_first_parser = NULL; >>> ^ >>> libavcodec/parser.c: In function ‘_Atomic’: >>> libavcodec/parser.c:35:33: error: expected declaration specifiers before >>> ‘av_first_parser’ >>> static _Atomic(AVCodecParser *) av_first_parser = NULL; >>> >>> also see >>> compat/atomics/gcc/stdatomic.h >>> >>> i think what you do is not supportd in that >>> >>> >> >> _Atomic is a keywork like volatile, so its syntax should be the same. >> Perhaps those emulations should just define it to "volatile" if its >> missing - the win32 emulation certainly would expect it to be >> volatile, and I would expect this to be true for the others as well. >> > > On that note, it seems a bit odd that the emulations don't typedef the > atomic types to be volatile. We replace "volatile int" with > "atomic_int" for example, and with win32 or gcc emulation for > stdatomic.h, the volatile is basically just being dropped. > Sounds like that might be missing? > Probably. Guess nobody really noticed it because the emulation wrappers are rarely used (msvc, gcc < 4.9, suncc). Maybe someone with old gcc could try a thread sanitizer run or two and compare the results with
Re: [FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
On Thu, Nov 30, 2017 at 3:29 PM, Hendrik Leppkeswrote: > On Thu, Nov 30, 2017 at 3:17 PM, Michael Niedermayer > wrote: >> On Thu, Nov 30, 2017 at 11:55:03AM +, Rostislav Pehlivanov wrote: >>> On 28 November 2017 at 01:26, Michael Niedermayer >>> wrote: >>> >>> > On Mon, Nov 27, 2017 at 04:30:18AM +, Rostislav Pehlivanov wrote: >>> > > Signed-off-by: Rostislav Pehlivanov >>> > > --- >>> > > libavcodec/parser.c | 14 -- >>> > > 1 file changed, 8 insertions(+), 6 deletions(-) >>> > > >>> > > diff --git a/libavcodec/parser.c b/libavcodec/parser.c >>> > > index 670680ea7c..baf1de4d88 100644 >>> > > --- a/libavcodec/parser.c >>> > > +++ b/libavcodec/parser.c >>> > > @@ -23,30 +23,32 @@ >>> > > #include >>> > > #include >>> > > #include >>> > > +#include >>> > > >>> > > #include "libavutil/avassert.h" >>> > > -#include "libavutil/atomic.h" >>> > > #include "libavutil/internal.h" >>> > > #include "libavutil/mem.h" >>> > > >>> > > #include "internal.h" >>> > > #include "parser.h" >>> > > >>> > > -static AVCodecParser *av_first_parser = NULL; >>> > > +static _Atomic(AVCodecParser *)av_first_parser = NULL; >>> > >>> > This doesnt build here >>> > >>> > libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled >>> > by default] >>> > static _Atomic(AVCodecParser *)av_first_parser = NULL; >>> > ^ >>> > libavcodec/parser.c: In function ‘_Atomic’: >>> > libavcodec/parser.c:35:32: error: expected declaration specifiers before >>> > ‘av_first_parser’ >>> > static _Atomic(AVCodecParser *)av_first_parser = NULL; >>> > ^ >>> > libavcodec/parser.c:38:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or >>> > ‘__attribute__’ before ‘{’ token >>> > { >>> > ^ >>> > libavcodec/parser.c:46:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or >>> > ‘__attribute__’ before ‘{’ token >>> > { >>> > ^ >>> > libavcodec/parser.c:55:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__a >>> > >>> > >>> > [...] >>> > -- >>> > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB >>> > >>> > Observe your enemies, for they first find out your faults. -- Antisthenes >>> > >>> > ___ >>> > ffmpeg-devel mailing list >>> > ffmpeg-devel@ffmpeg.org >>> > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >>> > >>> > >>> >>> Does the attached patch work? >> >>> parser.c | 14 -- >>> 1 file changed, 8 insertions(+), 6 deletions(-) >>> 71f66a37fb46e29626f27da4658f34927e48033c >>> v2-0001-lavc-parser-use-C11-atomics.patch >>> From b9ed59e9aff4a0fcc40f444f307c87acad55e139 Mon Sep 17 00:00:00 2001 >>> From: Rostislav Pehlivanov >>> Date: Mon, 27 Nov 2017 01:56:41 + >>> Subject: [PATCH v2 1/2] lavc/parser: use C11 atomics >>> >>> Signed-off-by: Rostislav Pehlivanov >>> --- >>> libavcodec/parser.c | 14 -- >>> 1 file changed, 8 insertions(+), 6 deletions(-) >>> >>> diff --git a/libavcodec/parser.c b/libavcodec/parser.c >>> index 670680ea7c..d6df62bf70 100644 >>> --- a/libavcodec/parser.c >>> +++ b/libavcodec/parser.c >>> @@ -23,30 +23,32 @@ >>> #include >>> #include >>> #include >>> +#include >>> >>> #include "libavutil/avassert.h" >>> -#include "libavutil/atomic.h" >>> #include "libavutil/internal.h" >>> #include "libavutil/mem.h" >>> >>> #include "internal.h" >>> #include "parser.h" >>> >>> -static AVCodecParser *av_first_parser = NULL; >>> +static _Atomic(AVCodecParser *) av_first_parser = NULL; >> >> no >> >> >> libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled by >> default] >> static _Atomic(AVCodecParser *) av_first_parser = NULL; >> ^ >> libavcodec/parser.c: In function ‘_Atomic’: >> libavcodec/parser.c:35:33: error: expected declaration specifiers before >> ‘av_first_parser’ >> static _Atomic(AVCodecParser *) av_first_parser = NULL; >> >> also see >> compat/atomics/gcc/stdatomic.h >> >> i think what you do is not supportd in that >> >> > > _Atomic is a keywork like volatile, so its syntax should be the same. > Perhaps those emulations should just define it to "volatile" if its > missing - the win32 emulation certainly would expect it to be > volatile, and I would expect this to be true for the others as well. > On that note, it seems a bit odd that the emulations don't typedef the atomic types to be volatile. We replace "volatile int" with "atomic_int" for example, and with win32 or gcc emulation for stdatomic.h, the volatile is basically just being dropped. Sounds like that might be missing? - Hendrik ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
On Thu, Nov 30, 2017 at 3:17 PM, Michael Niedermayerwrote: > On Thu, Nov 30, 2017 at 11:55:03AM +, Rostislav Pehlivanov wrote: >> On 28 November 2017 at 01:26, Michael Niedermayer >> wrote: >> >> > On Mon, Nov 27, 2017 at 04:30:18AM +, Rostislav Pehlivanov wrote: >> > > Signed-off-by: Rostislav Pehlivanov >> > > --- >> > > libavcodec/parser.c | 14 -- >> > > 1 file changed, 8 insertions(+), 6 deletions(-) >> > > >> > > diff --git a/libavcodec/parser.c b/libavcodec/parser.c >> > > index 670680ea7c..baf1de4d88 100644 >> > > --- a/libavcodec/parser.c >> > > +++ b/libavcodec/parser.c >> > > @@ -23,30 +23,32 @@ >> > > #include >> > > #include >> > > #include >> > > +#include >> > > >> > > #include "libavutil/avassert.h" >> > > -#include "libavutil/atomic.h" >> > > #include "libavutil/internal.h" >> > > #include "libavutil/mem.h" >> > > >> > > #include "internal.h" >> > > #include "parser.h" >> > > >> > > -static AVCodecParser *av_first_parser = NULL; >> > > +static _Atomic(AVCodecParser *)av_first_parser = NULL; >> > >> > This doesnt build here >> > >> > libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled >> > by default] >> > static _Atomic(AVCodecParser *)av_first_parser = NULL; >> > ^ >> > libavcodec/parser.c: In function ‘_Atomic’: >> > libavcodec/parser.c:35:32: error: expected declaration specifiers before >> > ‘av_first_parser’ >> > static _Atomic(AVCodecParser *)av_first_parser = NULL; >> > ^ >> > libavcodec/parser.c:38:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or >> > ‘__attribute__’ before ‘{’ token >> > { >> > ^ >> > libavcodec/parser.c:46:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or >> > ‘__attribute__’ before ‘{’ token >> > { >> > ^ >> > libavcodec/parser.c:55:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__a >> > >> > >> > [...] >> > -- >> > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB >> > >> > Observe your enemies, for they first find out your faults. -- Antisthenes >> > >> > ___ >> > ffmpeg-devel mailing list >> > ffmpeg-devel@ffmpeg.org >> > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >> > >> > >> >> Does the attached patch work? > >> parser.c | 14 -- >> 1 file changed, 8 insertions(+), 6 deletions(-) >> 71f66a37fb46e29626f27da4658f34927e48033c >> v2-0001-lavc-parser-use-C11-atomics.patch >> From b9ed59e9aff4a0fcc40f444f307c87acad55e139 Mon Sep 17 00:00:00 2001 >> From: Rostislav Pehlivanov >> Date: Mon, 27 Nov 2017 01:56:41 + >> Subject: [PATCH v2 1/2] lavc/parser: use C11 atomics >> >> Signed-off-by: Rostislav Pehlivanov >> --- >> libavcodec/parser.c | 14 -- >> 1 file changed, 8 insertions(+), 6 deletions(-) >> >> diff --git a/libavcodec/parser.c b/libavcodec/parser.c >> index 670680ea7c..d6df62bf70 100644 >> --- a/libavcodec/parser.c >> +++ b/libavcodec/parser.c >> @@ -23,30 +23,32 @@ >> #include >> #include >> #include >> +#include >> >> #include "libavutil/avassert.h" >> -#include "libavutil/atomic.h" >> #include "libavutil/internal.h" >> #include "libavutil/mem.h" >> >> #include "internal.h" >> #include "parser.h" >> >> -static AVCodecParser *av_first_parser = NULL; >> +static _Atomic(AVCodecParser *) av_first_parser = NULL; > > no > > > libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled by > default] > static _Atomic(AVCodecParser *) av_first_parser = NULL; > ^ > libavcodec/parser.c: In function ‘_Atomic’: > libavcodec/parser.c:35:33: error: expected declaration specifiers before > ‘av_first_parser’ > static _Atomic(AVCodecParser *) av_first_parser = NULL; > > also see > compat/atomics/gcc/stdatomic.h > > i think what you do is not supportd in that > > _Atomic is a keywork like volatile, so its syntax should be the same. Perhaps those emulations should just define it to "volatile" if its missing - the win32 emulation certainly would expect it to be volatile, and I would expect this to be true for the others as well. - Hendrik ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
On Thu, Nov 30, 2017 at 11:55:03AM +, Rostislav Pehlivanov wrote: > On 28 November 2017 at 01:26, Michael Niedermayer> wrote: > > > On Mon, Nov 27, 2017 at 04:30:18AM +, Rostislav Pehlivanov wrote: > > > Signed-off-by: Rostislav Pehlivanov > > > --- > > > libavcodec/parser.c | 14 -- > > > 1 file changed, 8 insertions(+), 6 deletions(-) > > > > > > diff --git a/libavcodec/parser.c b/libavcodec/parser.c > > > index 670680ea7c..baf1de4d88 100644 > > > --- a/libavcodec/parser.c > > > +++ b/libavcodec/parser.c > > > @@ -23,30 +23,32 @@ > > > #include > > > #include > > > #include > > > +#include > > > > > > #include "libavutil/avassert.h" > > > -#include "libavutil/atomic.h" > > > #include "libavutil/internal.h" > > > #include "libavutil/mem.h" > > > > > > #include "internal.h" > > > #include "parser.h" > > > > > > -static AVCodecParser *av_first_parser = NULL; > > > +static _Atomic(AVCodecParser *)av_first_parser = NULL; > > > > This doesnt build here > > > > libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled > > by default] > > static _Atomic(AVCodecParser *)av_first_parser = NULL; > > ^ > > libavcodec/parser.c: In function ‘_Atomic’: > > libavcodec/parser.c:35:32: error: expected declaration specifiers before > > ‘av_first_parser’ > > static _Atomic(AVCodecParser *)av_first_parser = NULL; > > ^ > > libavcodec/parser.c:38:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > > ‘__attribute__’ before ‘{’ token > > { > > ^ > > libavcodec/parser.c:46:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > > ‘__attribute__’ before ‘{’ token > > { > > ^ > > libavcodec/parser.c:55:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__a > > > > > > [...] > > -- > > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > > > Observe your enemies, for they first find out your faults. -- Antisthenes > > > > ___ > > ffmpeg-devel mailing list > > ffmpeg-devel@ffmpeg.org > > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > > > > > Does the attached patch work? > parser.c | 14 -- > 1 file changed, 8 insertions(+), 6 deletions(-) > 71f66a37fb46e29626f27da4658f34927e48033c > v2-0001-lavc-parser-use-C11-atomics.patch > From b9ed59e9aff4a0fcc40f444f307c87acad55e139 Mon Sep 17 00:00:00 2001 > From: Rostislav Pehlivanov > Date: Mon, 27 Nov 2017 01:56:41 + > Subject: [PATCH v2 1/2] lavc/parser: use C11 atomics > > Signed-off-by: Rostislav Pehlivanov > --- > libavcodec/parser.c | 14 -- > 1 file changed, 8 insertions(+), 6 deletions(-) > > diff --git a/libavcodec/parser.c b/libavcodec/parser.c > index 670680ea7c..d6df62bf70 100644 > --- a/libavcodec/parser.c > +++ b/libavcodec/parser.c > @@ -23,30 +23,32 @@ > #include > #include > #include > +#include > > #include "libavutil/avassert.h" > -#include "libavutil/atomic.h" > #include "libavutil/internal.h" > #include "libavutil/mem.h" > > #include "internal.h" > #include "parser.h" > > -static AVCodecParser *av_first_parser = NULL; > +static _Atomic(AVCodecParser *) av_first_parser = NULL; no libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled by default] static _Atomic(AVCodecParser *) av_first_parser = NULL; ^ libavcodec/parser.c: In function ‘_Atomic’: libavcodec/parser.c:35:33: error: expected declaration specifiers before ‘av_first_parser’ static _Atomic(AVCodecParser *) av_first_parser = NULL; also see compat/atomics/gcc/stdatomic.h i think what you do is not supportd in that [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Breaking DRM is a little like attempting to break through a door even though the window is wide open and the only thing in the house is a bunch of things you dont want and which you would get tomorrow for free anyway signature.asc Description: Digital signature ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
On 28 November 2017 at 01:26, Michael Niedermayerwrote: > On Mon, Nov 27, 2017 at 04:30:18AM +, Rostislav Pehlivanov wrote: > > Signed-off-by: Rostislav Pehlivanov > > --- > > libavcodec/parser.c | 14 -- > > 1 file changed, 8 insertions(+), 6 deletions(-) > > > > diff --git a/libavcodec/parser.c b/libavcodec/parser.c > > index 670680ea7c..baf1de4d88 100644 > > --- a/libavcodec/parser.c > > +++ b/libavcodec/parser.c > > @@ -23,30 +23,32 @@ > > #include > > #include > > #include > > +#include > > > > #include "libavutil/avassert.h" > > -#include "libavutil/atomic.h" > > #include "libavutil/internal.h" > > #include "libavutil/mem.h" > > > > #include "internal.h" > > #include "parser.h" > > > > -static AVCodecParser *av_first_parser = NULL; > > +static _Atomic(AVCodecParser *)av_first_parser = NULL; > > This doesnt build here > > libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled > by default] > static _Atomic(AVCodecParser *)av_first_parser = NULL; > ^ > libavcodec/parser.c: In function ‘_Atomic’: > libavcodec/parser.c:35:32: error: expected declaration specifiers before > ‘av_first_parser’ > static _Atomic(AVCodecParser *)av_first_parser = NULL; > ^ > libavcodec/parser.c:38:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > ‘__attribute__’ before ‘{’ token > { > ^ > libavcodec/parser.c:46:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or > ‘__attribute__’ before ‘{’ token > { > ^ > libavcodec/parser.c:55:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__a > > > [...] > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > Observe your enemies, for they first find out your faults. -- Antisthenes > > ___ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > Does the attached patch work? From b9ed59e9aff4a0fcc40f444f307c87acad55e139 Mon Sep 17 00:00:00 2001 From: Rostislav Pehlivanov Date: Mon, 27 Nov 2017 01:56:41 + Subject: [PATCH v2 1/2] lavc/parser: use C11 atomics Signed-off-by: Rostislav Pehlivanov --- libavcodec/parser.c | 14 -- 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/libavcodec/parser.c b/libavcodec/parser.c index 670680ea7c..d6df62bf70 100644 --- a/libavcodec/parser.c +++ b/libavcodec/parser.c @@ -23,30 +23,32 @@ #include #include #include +#include #include "libavutil/avassert.h" -#include "libavutil/atomic.h" #include "libavutil/internal.h" #include "libavutil/mem.h" #include "internal.h" #include "parser.h" -static AVCodecParser *av_first_parser = NULL; +static _Atomic(AVCodecParser *) av_first_parser = NULL; AVCodecParser *av_parser_next(const AVCodecParser *p) { if (p) return p->next; else -return av_first_parser; +return atomic_load(_first_parser); } void av_register_codec_parser(AVCodecParser *parser) { +AVCodecParser *old_parser; do { -parser->next = av_first_parser; -} while (parser->next != avpriv_atomic_ptr_cas((void * volatile *)_first_parser, parser->next, parser)); +parser->next = old_parser = atomic_load(_first_parser); +atomic_compare_exchange_strong(_first_parser, _parser, parser); +} while (parser->next != old_parser); } AVCodecParserContext *av_parser_init(int codec_id) @@ -58,7 +60,7 @@ AVCodecParserContext *av_parser_init(int codec_id) if (codec_id == AV_CODEC_ID_NONE) return NULL; -for (parser = av_first_parser; parser; parser = parser->next) { +for (parser = atomic_load(_first_parser); parser; parser = parser->next) { if (parser->codec_ids[0] == codec_id || parser->codec_ids[1] == codec_id || parser->codec_ids[2] == codec_id || -- 2.15.1.424.g9478a66081 ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Re: [FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
On Mon, Nov 27, 2017 at 04:30:18AM +, Rostislav Pehlivanov wrote: > Signed-off-by: Rostislav Pehlivanov> --- > libavcodec/parser.c | 14 -- > 1 file changed, 8 insertions(+), 6 deletions(-) > > diff --git a/libavcodec/parser.c b/libavcodec/parser.c > index 670680ea7c..baf1de4d88 100644 > --- a/libavcodec/parser.c > +++ b/libavcodec/parser.c > @@ -23,30 +23,32 @@ > #include > #include > #include > +#include > > #include "libavutil/avassert.h" > -#include "libavutil/atomic.h" > #include "libavutil/internal.h" > #include "libavutil/mem.h" > > #include "internal.h" > #include "parser.h" > > -static AVCodecParser *av_first_parser = NULL; > +static _Atomic(AVCodecParser *)av_first_parser = NULL; This doesnt build here libavcodec/parser.c:35:8: warning: return type defaults to ‘int’ [enabled by default] static _Atomic(AVCodecParser *)av_first_parser = NULL; ^ libavcodec/parser.c: In function ‘_Atomic’: libavcodec/parser.c:35:32: error: expected declaration specifiers before ‘av_first_parser’ static _Atomic(AVCodecParser *)av_first_parser = NULL; ^ libavcodec/parser.c:38:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token { ^ libavcodec/parser.c:46:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token { ^ libavcodec/parser.c:55:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__a [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Observe your enemies, for they first find out your faults. -- Antisthenes signature.asc Description: Digital signature ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
[FFmpeg-devel] [PATCH 1/4] lavc/parser: use C11 atomics
Signed-off-by: Rostislav Pehlivanov--- libavcodec/parser.c | 14 -- 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/libavcodec/parser.c b/libavcodec/parser.c index 670680ea7c..baf1de4d88 100644 --- a/libavcodec/parser.c +++ b/libavcodec/parser.c @@ -23,30 +23,32 @@ #include #include #include +#include #include "libavutil/avassert.h" -#include "libavutil/atomic.h" #include "libavutil/internal.h" #include "libavutil/mem.h" #include "internal.h" #include "parser.h" -static AVCodecParser *av_first_parser = NULL; +static _Atomic(AVCodecParser *)av_first_parser = NULL; AVCodecParser *av_parser_next(const AVCodecParser *p) { if (p) return p->next; else -return av_first_parser; +return atomic_load(_first_parser); } void av_register_codec_parser(AVCodecParser *parser) { +AVCodecParser *old_parser; do { -parser->next = av_first_parser; -} while (parser->next != avpriv_atomic_ptr_cas((void * volatile *)_first_parser, parser->next, parser)); +parser->next = old_parser = atomic_load(_first_parser); +atomic_compare_exchange_strong(_first_parser, _parser, parser); +} while (parser->next != old_parser); } AVCodecParserContext *av_parser_init(int codec_id) @@ -58,7 +60,7 @@ AVCodecParserContext *av_parser_init(int codec_id) if (codec_id == AV_CODEC_ID_NONE) return NULL; -for (parser = av_first_parser; parser; parser = parser->next) { +for (parser = atomic_load(_first_parser); parser; parser = parser->next) { if (parser->codec_ids[0] == codec_id || parser->codec_ids[1] == codec_id || parser->codec_ids[2] == codec_id || -- 2.15.0.417.g466bffb3ac ___ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel