std::thread error (thread not member of std)

Question

I compiled & installed gcc4.4 using macports.

When I try to compile using -> g++ -g -Wall -ansi -pthread -std=c++0x main.cpp...:

 #include <thread>
 ...
  std::thread t(handle);
  t.join();
 ....

The compiler returns:

 cserver.cpp: In member function 'int CServer::run()':
 cserver.cpp:48: error: 'thread' is not a member of 'std'
 cserver.cpp:48: error: expected ';' before 't'
 cserver.cpp:49: error: 't' was not declared in this scope

But std::cout <<... compiles fine..

Can anyone help me?

If you look in the thread header, it appears that the class only exists #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1). I'm not sure though, what you'd have to do to have those defined. — UncleBens
– UncleBens, Commented Mar 25, 2010 at 22:46
@UncleBens: I believe those are directly defined by -pthread and -std=c++0x. Omitting -pthread causes a seg fault: gcc.gnu.org/ml/gcc-help/2009-04/msg00208.html — Artem Sokolov
– Artem Sokolov, Commented Mar 26, 2010 at 3:47
Just the latest update: MacPorts gcc 4.7.0 supports/compiles std::thread, while 4.6.3 does not. — P Marecki
– P Marecki, Commented Apr 26, 2012 at 9:45

Artem Sokolov · Accepted Answer · 2010-03-26 03:43:21Z

15

gcc does not fully support std::thread yet:

http://gcc.gnu.org/projects/cxx0x.html

http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html

Use boost::thread in the meantime.

Edit

Although the following compiled and ran fine for me with gcc 4.4.3:

#include <thread>
#include <iostream>

struct F
{
  void operator() () const
  {
    std::cout<<"Printing from another thread"<<std::endl;
  }
};

int main()
{
  F f;
  std::thread t(f);
  t.join();

  return 0;
}

Compiled with

g++ -Wall -g -std=c++0x -pthread main.cpp

Output of a.out:

Printing from another thread

Can you provide the full code? Maybe there's some obscure issue lurking in those ...s?

edited Mar 26, 2010 at 3:43

answered Mar 26, 2010 at 3:24

Artem Sokolov

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2 Comments

luis Over a year ago

I tried your code and I get the same error... Can this be OSX related? Or maybe something that isn't right with the GCC install by MacPorts?

Artem Sokolov Over a year ago

It may be that MacPorts doesn't fully support c++0x functionality? Do you have the output from your gcc configure script? Here's one Mac user for whom configure specified that std::thread is not supported: (mail-archive.com/[email protected]/msg00973.html)

Vlad Bezden · Accepted Answer · 2016-11-30 19:49:06Z

7

I had the same issue on windows using MinGW. I found wrapper classes for in on github mingw-std-threads Including mingw.mutex.h, mingw.thread.h files to global MinGW directory fixed this issue. All I had to do is to include header file and my code stayed the same

#include "mingw.thread.h"

...
std::thread t(handle);
...

answered Nov 30, 2016 at 19:49

Vlad Bezden

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2 Comments

CoreyRS Over a year ago

Cheers for this. Was driving me crazy. Your answer was slightly confusing where you referred to the global MinGW directory. I had to drop the files in the project folder where all the other .h files are to get it work... but it worked.

Gerasimos Ragavanis Over a year ago

Well what do you mean global directory, I am trying to find where to insert it tried globally same level with /bin /include doesn't work. thank you in advance

deft_code · Accepted Answer · 2010-03-26 14:23:15Z

6

Drop -ansi, it means -std=c++98, which you obviously don't want. It also causes macro __STRICT_ANSI__ to be defined and this may change the behavior of the headers, e.g. by disabling C++0x support.

edited Mar 26, 2010 at 14:23

deft_code

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answered Mar 25, 2010 at 21:50

Tronic

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3 Comments

Tronic Over a year ago

The macro name actually has two underscores at the end, but SO misinterprets it as formatting if I write it correctly.

luis Over a year ago

Well pointed out, I removed it, but it still gives me the same error.. I tried with gcc4.4 and gcc4.5 beta... This is frustrating.

deft_code Over a year ago

fixed the missing underscore problem.

Arpit Mathur · Accepted Answer · 2023-10-28 08:10:36Z

0

Update your MinGW compiler to the latest version by using MSYS2 for this error or try reinstalling MinGW by using MSYS2

cserver.cpp:48: error: 'thread' is not a member of 'std'

answered Oct 28, 2023 at 8:10

Arpit Mathur

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