Re: [Firebird-devel] Coroutines

[Roman Simakov]

With callbacks you will smear code over two methods: caller, callback.
Also you will need to keep some state! AFAIU coroutins solve this
problem in more elegant manner using saving running context. Operator
A push a portion of data to pipe and *goto* operator B which pull the
portion process it and push the result to the next operator. In some
time operator A get CPU again and produce neew portion. Note: every
operator located in SINGLE place of code, but you keep pipeline
(streams) whithout huge buffers.

2016-10-26 17:51 GMT+03:00 Dimitry Sibiryakov :
> 26.10.2016 16:41, Adriano dos Santos Fernandes wrote:
>> We can't *callback* our caller.
>
>Why not? It is a matter of adding one method to your new API:
>
> class IEater
> {
> int pushData(IMessageMetadata* metadata, void* buffer);
> };
>
> IStatus* IAttachment::execute(const char* SQL, IMessageMetadata* 
> inputMetadata, void*
> inputData, IEater* outputCallback);
>
>
> --
>WBR, SD.
>
> --
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Re: [Firebird-devel] Coroutines

[Egor Pugin]

Why not callbacks?

On 26 October 2016 at 15:51, Roman Simakov  wrote:
> 2016-10-26 15:24 GMT+03:00 Dimitry Sibiryakov :
>>  It must be more than just nice to add gigabyte of boost sources or 30 
>> megabytes library
>> to Firebird
>
> I guess it's not about boost but about approach. I thought about the
> same approach in SciDB to provide nice way to implement new operators
> in one peace of well readable code but keep a pipeline processing of
> data.
>
> --
> Roman Simakov
>
> --
> The Command Line: Reinvented for Modern Developers
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Re: [Firebird-devel] Coroutines

[Roman Simakov]

2016-10-26 15:24 GMT+03:00 Dimitry Sibiryakov :
>  It must be more than just nice to add gigabyte of boost sources or 30 
> megabytes library
> to Firebird

I guess it's not about boost but about approach. I thought about the
same approach in SciDB to provide nice way to implement new operators
in one peace of well readable code but keep a pipeline processing of
data.

-- 
Roman Simakov

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[Firebird-devel] [FB-Tracker] Created: (CORE-5382) Incorrect processing (truncation) of SQL statement with length 10MB+1

[Kovalenko Dmitry (JIRA)]

Incorrect processing (truncation) of SQL statement with length 10MB+1
-

 Key: CORE-5382
 URL: http://tracker.firebirdsql.org/browse/CORE-5382
 Project: Firebird Core
  Issue Type: Bug
  Components: Engine
Affects Versions: 3.0.2
 Environment: Firebird 3.0.2.32619, IBProvider, direct INET-connection 
to FB3 (without fbclient.dll).
Reporter: Kovalenko Dmitry


SQL Statement (total length = 10*1024*1024+1):

 "select/*--  ---*/ID from DUAL "

---
Prepare error:

Dynamic SQL Error
SQL error code = -204
Table unknown
DUA

---

1. I think, the error message must be a little another.

2. Special for this case, I created the new table "DUA" and server prepared 
original query without any problem.


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Re: [Firebird-devel] Coroutines

[Dimitry Sibiryakov]

26.10.2016 13:33, Adriano dos Santos Fernandes wrote:
> This is so nice (and apparent fast in Linux) that I'm going to
> investigate further.

   It must be more than just nice to add gigabyte of boost sources or 30 
megabytes library 
to Firebird.


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[Firebird-devel] Coroutines

[Adriano dos Santos Fernandes]

Hi!

Learning node.js and its single-threaded model with asynchronous
execution, I looked for things that can improve Firebird as well.

It's obvious that things like boost asio may be a good thing when
dealing with sockets and filesystem, but is not subject of this thread.

Today I got up thinking in coroutines and then I thought how good it
would be in the context of Firebird statement execution.

Statement execution is very dirty code most because semantics of SUSPEND.

Here I paste very small hand-made statement execution with SUSPEND
semantics using boost coroutine (with v1, but there is a v2 library).

http://pastebin.com/VR7KcnTa

This is so nice (and apparent fast in Linux) that I'm going to
investigate further.

Architecture support is mentioned here:
http://www.boost.org/doc/libs/1_61_0/libs/context/doc/html/context/architectures.html.
I didn't even evaluated this table with attention now. I think some
disruptive ideas sometimes are good to bring new ideas.


Adriano


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Re: [Firebird-devel] error: '::lockf' has not been declared

[Alex Peshkoff]

On 10/26/16 12:29, marius adrian popa wrote:

Any ideas ?

This happens only on Android build with master (3.0 branch builds ok)

make yvalve
make[4]: Entering directory '/home/mariuz/Work/firebird/firebird/gen'
/home/mariuz/android-ndk-r13/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/x86_64-linux-android-g++
-I/home/mariuz/Work/firebird/firebird/src/include/gen
-I/home/mariuz/Work/firebird/firebird/src/include  -ggdb
-DFB_SEND_FLAGS=MSG_NOSIGNAL -DLINUX -DANDROID -DAMD64 -pipe -MMD -fPIC
-fmessage-length=0 -I/home/mariuz/Work/firebird/firebird/extern/libtommath
--sysroot=/home/mariuz/android-ndk-r13/platforms/android-24/arch-x86_64
-I/home/mariuz/android-ndk-r13/platforms/android-24/arch-x86_64/usr/include
-I/home/mariuz/Work/firebird/firebird/gen/cross -fno-omit-frame-pointer
-pthread -fno-rtti -pthread -std=c++11  -c
/home/mariuz/Work/firebird/firebird/src/yvalve/gds.cpp -o
/home/mariuz/Work/firebird/firebird/temp/Release/yvalve/gds.o
In file included from
/home/mariuz/Work/firebird/firebird/src/yvalve/gds.cpp:52:0:
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h: In
function 'int os_utils::lockf(int, int, off_t)':
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h:185:9:
error: '::lockf' has not been declared
 rc = ::lockf(fd, cmd, len);
  ^
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h:185:9:
note: suggested alternative:
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h:176:13:
note:   'os_utils::lockf'
   inline int lockf(int fd, int cmd, off_t len)
  ^


This patch should help.


diff --git a/src/common/os/os_utils.h b/src/common/os/os_utils.h
index 00d4933..c4c7085 100644
--- a/src/common/os/os_utils.h
+++ b/src/common/os/os_utils.h
@@ -173,6 +173,8 @@ namespace os_utils
 	}
 
 #ifndef WIN_NT
+
+#ifndef HAVE_FLOCK
 	inline int lockf(int fd, int cmd, off_t len)
 	{
 		int rc;
@@ -188,6 +190,7 @@ namespace os_utils
 
 		return rc;
 	}
+#endif
 
 	inline int mkstemp(char* templ)
 	{
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[Firebird-devel] error: '::lockf' has not been declared

[marius adrian popa]

Any ideas ?

This happens only on Android build with master (3.0 branch builds ok)

make yvalve
make[4]: Entering directory '/home/mariuz/Work/firebird/firebird/gen'
/home/mariuz/android-ndk-r13/toolchains/x86_64-4.9/prebuilt/linux-x86_64/bin/x86_64-linux-android-g++
-I/home/mariuz/Work/firebird/firebird/src/include/gen
-I/home/mariuz/Work/firebird/firebird/src/include  -ggdb
-DFB_SEND_FLAGS=MSG_NOSIGNAL -DLINUX -DANDROID -DAMD64 -pipe -MMD -fPIC
-fmessage-length=0 -I/home/mariuz/Work/firebird/firebird/extern/libtommath
--sysroot=/home/mariuz/android-ndk-r13/platforms/android-24/arch-x86_64
-I/home/mariuz/android-ndk-r13/platforms/android-24/arch-x86_64/usr/include
-I/home/mariuz/Work/firebird/firebird/gen/cross -fno-omit-frame-pointer
-pthread -fno-rtti -pthread -std=c++11  -c
/home/mariuz/Work/firebird/firebird/src/yvalve/gds.cpp -o
/home/mariuz/Work/firebird/firebird/temp/Release/yvalve/gds.o
In file included from
/home/mariuz/Work/firebird/firebird/src/yvalve/gds.cpp:52:0:
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h: In
function 'int os_utils::lockf(int, int, off_t)':
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h:185:9:
error: '::lockf' has not been declared
rc = ::lockf(fd, cmd, len);
 ^
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h:185:9:
note: suggested alternative:
/home/mariuz/Work/firebird/firebird/src/yvalve/../common/os/os_utils.h:176:13:
note:   'os_utils::lockf'
  inline int lockf(int fd, int cmd, off_t len)
 ^
make.rules:106: recipe for target
'/home/mariuz/Work/firebird/firebird/temp/Release/yvalve/gds.o' failed
make[4]: ***
[/home/mariuz/Work/firebird/firebird/temp/Release/yvalve/gds.o] Error 1
make[4]: Leaving directory '/home/mariuz/Work/firebird/firebird/gen'
Makefile:240: recipe for target 'cross2' failed
make[3]: *** [cross2] Error 2
make[3]: Leaving directory '/home/mariuz/Work/firebird/firebird/gen'
Makefile:211: recipe for target 'cross_process' failed
make[2]: *** [cross_process] Error 2
make[2]: Leaving directory '/home/mariuz/Work/firebird/firebird/gen'
Makefile:74: recipe for target 'firebird' failed
make[1]: *** [firebird] Error 2
make[1]: Leaving directory '/home/mariuz/Work/firebird/firebird/gen'
Makefile:6: recipe for target 'firebird' failed
make: *** [firebird] Error 2
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