MESSAGE
| DATE | 2016-12-21 |
| FROM | Samir Iabbassen
|
| SUBJECT | Re: [Learn] thread concurancy
|
From learn-bounces-at-nylxs.com Wed Dec 21 21:49:07 2016
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From: Samir Iabbassen
To: Ruben Safir , "learn-at-nylxs.com"
Thread-Topic: thread concurancy
Thread-Index: AQHSW8u5J02IBUvu5E2+QXalsHxCkqETQTMP
Date: Thu, 22 Dec 2016 02:49:03 +0000
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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++;
}
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