MESSAGE
| DATE | 2016-12-27 |
| FROM | Samir Iabbassen
|
| SUBJECT | Re: [Learn] thread concurancy
|
From learn-bounces-at-nylxs.com Tue Dec 27 17:02:25 2016
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From: Samir Iabbassen
To: Ruben Safir , "learn-at-nylxs.com"
Thread-Topic: [Learn] thread concurancy
Thread-Index: AQHSW8u5J02IBUvu5E2+QXalsHxCkqETQTMPgAB1PACACKuzKA==
Date: Tue, 27 Dec 2016 22:02:20 +0000
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References: <2a2adad8-9115-46f3-f74f-82ea0d132614-at-mrbrklyn.com>
<1482374939422.53063-at-liu.edu>, <5d40f92d-f67f-4723-3fbc-d715f3786a2f-at-panix.com>
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Subject: Re: [Learn] thread concurancy
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Got it.
Thank you.
________________________________________
From: Learn on behalf of Ruben Safir
Sent: Wednesday, December 21, 2016 11:37 PM
To: learn-at-nylxs.com
Subject: Re: [Learn] thread concurancy
Blackboard is crap
On 12/21/2016 09:49 PM, Samir Iabbassen wrote:
> Hi Ruben,
>
> if you didn't send the project report, please send it to me along with whatever source code you have so far. the semester is at its end and I need to finalize grading. I know you have spent a lots of time on the project and I will be based on it for your total grading.
> Send me your resume and I will forward it to the my friend for the dba position, meanwhile follow the instructions for formal application.
> I also got following this morning from another friend if you are interested.
> >>Hi guys
>
> >>Do you know any jr. App Dev looking for a gig in city?
>
> >>There is job at DOT although not in IT dept. Computer Associate 2
>
> >>Let me know. I will send job link when active.
>
> >>Regards,
>
> Happy Holidays and see you in spring...
> ________________________________________
> From: Ruben Safir
> Sent: Wednesday, December 21, 2016 3:49 PM
> To: learn-at-nylxs.com
> Subject: thread concurancy
>
> [This mail was also posted to comp.lang.c++.]
>
> :(
>
> I don't know. I'm very confused about the behavior of this test program
> I've been right.
> I'm trying to move date by worker threads from one blob of memory to
> another and the debugger is saying that the pointers beg and
> canvas_index is jumping 10 bytes between this two lines
>
> for(int i = 0; i < 10;i++)
> {
> t[i] = std::thread([this]{ readin(beg, canvas_index); });
>
> and I'm not sure why. I lost the concurrency somewhere, but can't seem
> to figure out what I did wrong
>
>
> #include
> #include
> #include
> std::mutex medco;
> std::mutex master;
>
> namespace testing{
> std::thread t[10];
> class PIC
> {
> public:
> PIC():beg{&source[0]} {
> canvas_index = canvas;
> std::cout << "Testing Source" << std::endl;
> for(int i = 0; i<100; i++)
> {
> std::cout << i << " " << source[i] << std::endl ;
> }
> for(int i = 0; i < 10;i++)
> {
> t[i] = std::thread([this]{ readin(beg, canvas_index); });
> std::cerr << i << ": Making a thread" << std::endl;
> sync_canvas_and_input();
> }
> };
>
> void sync_canvas_and_input()
> {
> std::cout << "**LOCKING**" << std::endl;
> std::lock_guard turn(medco);
> beg += 10;
> canvas_index += 10;
> }
>
> ~PIC()
> {
> std::cerr << "In the destructor" << std::endl;
> for(int i=0; i<10; i++)
> {
> t[i].join();
> std::cerr << i << ": Joining a thread" << std::endl; }
>
> };
> void readin(char * start, char * loc_canvas_index)
> {
> for( int i = 9; i>=0; i-- )
> {
> *loc_canvas_index = start[i];
> std::cerr << i << ": Copy " << start[i] << std::endl;
> std::cerr << i << ": Copied to loc_canvas_index " <<
> reinterpret_cast(*loc_canvas_index) << std::endl;
> loc_canvas_index++;
> }
>
>
> --
> So many immigrant groups have swept through our town
> that Brooklyn, like Atlantis, reaches mythological
> proportions in the mind of the world - RI Safir 1998
> http://www.mrbrklyn.com
>
> DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
> http://www.nylxs.com - Leadership Development in Free Software
> http://www2.mrbrklyn.com/resources - Unpublished Archive
> http://www.coinhangout.com - coins!
> http://www.brooklyn-living.com
>
> Being so tracked is for FARM ANIMALS and and extermination camps,
> but incompatible with living as a free human being. -RI Safir 2013
>
> _______________________________________________
> Learn mailing list
> Learn-at-nylxs.com
> http://lists.mrbrklyn.com/mailman/listinfo/learn
>
--
So many immigrant groups have swept through our town
that Brooklyn, like Atlantis, reaches mythological
proportions in the mind of the world - RI Safir 1998
http://www.mrbrklyn.com
DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
http://www2.mrbrklyn.com/resources - Unpublished Archive
http://www.coinhangout.com - coins!
http://www.brooklyn-living.com
Being so tracked is for FARM ANIMALS and and extermination camps,
but incompatible with living as a free human being. -RI Safir 2013
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Learn mailing list
Learn-at-nylxs.com
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