C++11 thread error runtime

Question

Hello I have problem with threads in C++11. I have ubuntu 64bit 13.10(testing) with g++ 4.8.1. I tried to compile code:

#include <thread>

void func()
{
   // do some work
}

int main()
{
   std::thread t(func);
   t.join();
   return 0;
}

with options: -std=c++11 -pthread -lpthread. Compilation was successful, but when I tried to run it, I've received an error:

terminate called after throwing an instance of 'std::system_error'
what(): Enable multithreading to use std::thread: Operation not permitted

Could you try with -pthread -std=c++11 ? (without -lpthread) — sphair
– sphair, Commented Oct 14, 2013 at 11:23
Seems that other people have this issue bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1228201 — log0
– log0, Commented Oct 14, 2013 at 11:26

Daniel Frey · Accepted Answer · 2013-10-14 12:55:26Z

6

I think the other answers are a bit misleading. What is important is that you only need -pthread. The order of this flag is not important!

-pthread will automatically link with libpthread and it'll do so correctly. Note that you need to provide this option both when compiling and linking your code (except when you do everything at once, of course).

Only when you provide -lpthread explicitly, the order of where you put might be important, but as already mentioned, you shouldn't add it explicitly when using -pthread.

edited Oct 14, 2013 at 12:55

answered Oct 14, 2013 at 12:25

Daniel Frey

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1 Comment

BЈовић Over a year ago

Using -pthread is not going to help in this case. I have the same environment, and the only solution is this

log0 · Accepted Answer · 2013-10-14 11:37:46Z

5

You probably have the same problem as mentioned here:
https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1228201

Add this flag to your command line. It will force g++ to link with the given libraries.

-Wl,--no-as-needed

answered Oct 14, 2013 at 11:37

log0

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Comments

Community · Accepted Answer · 2017-05-23 12:16:00Z

2

It seems that order matters, or atleast, that's what is said in this thread: C++ Threads, std::system_error - operation not permitted?

edited May 23, 2017 at 12:16

CommunityBot

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answered Oct 14, 2013 at 11:23

Bolke

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2 Comments

stefan Over a year ago

Correct. And I never knew why exactly, but this one explains it: stackoverflow.com/questions/18827938/… Basically, if you use -lwhatever before the file that needs the library, the linker discards it since it didn't see any of the symbols used so far.

log0 Over a year ago

yes linked libraries must be on the right of the file that needs it. But is it really the problem of the OP ? Seems that other people have the same issue on Ubuntu 13.10.

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