What causes runtime error message: std::system_error - operation not permitted, including mult-threading? [duplicate]

Question

Update in 2022

C++ 17 & 20 now have built in support for multithreading in the standard library. I would suggest using these rather than using the Linux specific pthread library.

Original Question

I wrote a program to test threads on 64 bit kubuntu linux, version 13.04. Actually I robbed the code from someone else who was writing a test program.

#include <cstdlib>
#include <iostream>
#include <thread>

void task1(const std::string msg)
{
    std::cout << "task1 says: " << msg << std::endl;
}

int main(int argc, char **argv)
{
    std::thread t1(task1, "Hello");
    t1.join();

    return EXIT_SUCCESS;
}

I compiled using:

g++ -pthread -std=c++11 -c main.cpp
g++ main.o -o main.out

Then ran:

./main.out

As an aside, when I 'ls -l', main.out shows up in in green text like all executables, but also has an asterisk at the end of its name. Why is this?

Back to the problem in hand: When I ran main.out, an error appeared, which said:

terminate called after throwing an instance of 'std::system_error'
  what():  Operation not permitted
Aborted (core dumped)

Anyone any ideas on how to fix this?

This question should not be marked duplicated. There are other situation where you can get this error message. Not limited to threading linking issue. — Kemin Zhou
– Kemin Zhou, Commented Aug 31, 2022 at 18:39

billz · Accepted Answer · 2013-12-01 23:25:44Z

109

You are not linking pthread properly, try below command(note: order matters)

g++  main.cpp -o main.out -pthread -std=c++11

OR

Do it with two commands

g++ -c main.cpp -pthread -std=c++11         // generate target object file
g++ main.o -o main.out -pthread -std=c++11  // link to target binary

edited Dec 1, 2013 at 23:25

answered Jun 24, 2013 at 11:10

billz

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11 Comments

David Schwartz Over a year ago

You can do it with two commands. But you must specify -pthread both when you compile and when you link.

hetepeperfan Over a year ago

@billz Would you mind elaborate on why the order of -pthread matters?

billz Over a year ago

you need to compile it first before link it. put -pthread int the end of g++ command will allow g++ link it properly after compiled to .o file

hetepeperfan Over a year ago

thus also reading the comment of David Schwartz -pthread is mainly needed at the linking stage, not neccesary while compiling?

Jonathan Wakely Over a year ago

The GCC manual entry for -pthread specifically says "This option sets flags for both the preprocessor and linker." You should use it when compiling as well as linking.

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