Error thread is not a member of std

Operating System: Windows XP SP3
Compiler: MinGW g++ 4.7.2
Code:

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#include <thread>

void g() {}

int main() {
   std::thread t(g);
   
   return 0;
}

Commands:

mingw32-g++.exe -Wall  -O2  -std=c++11    -c "C:ProgrammingThread Practicemain.cpp" -o objReleasemain.o

Errors:

C:ProgrammingThread Practicemain.cpp||In function 'int main()':|
C:ProgrammingThread Practicemain.cpp|6|error: 'thread' is not a member of 'std'|
C:ProgrammingThread Practicemain.cpp|6|error: expected ';' before 't'|
||=== Build finished: 2 errors, 0 warnings (0 minutes, 2 seconds) ===|

After doing some research, apparently MinGW still doesn’t have a port for the threads library for Windows. Has anyone gotten this to work yet?

Then you either use another compiler (maybe VS2012 supports c++ 11 threads — but if you run XP you cannot use it) or you do not use C++11 features at all.

MinGW for example does not even fully supports Unicode these days (just an example)

I can’t even install VS2012 on my computer due to hardware limitations (MS’s excuse, not mine).

I’ve been able to use every other C++11 feature that I’ve tried so far (I have numerous examples on this forum). I’m just saddened that MinGW hasn’t implemented threads for Windows yet.

I was not aware it didn’t fully support Unicode yet, but like what specifically? I don’t use Unicode nearly at all, but it would be nice to know what’s actually limited.

Maybe once I free up some more space, I’ll put boost back on my computer, or I’ll switch to my Linux partition and just practice threads there. I just like a one place stop to do everything I need. Are you aware if the Cygwin port uses threads?

Nothing is stopping you to use _beginthreadex() from process.h, it is available in MinGW too and is not a C++11 feature.

MinGW support Unicode if you use -municode switch (only recent versions) for wWinMain (GUI applications), but even then there is no support for console applications built for Unicode (wmain entry point). You will get a linker error if you try to do that.

I hate using C, but there is no alternative for Windows at the moment. I also hate the WinAPI. So far, it looks like process.h requires both. Is this true concurrency? Looking at some examples (takes me a while to completely understand what’s going on since I’m not familiar with C), I’m trying to follow how it works.

So far I’m understanding that beginthread returns a handle to said thread, and endthread needs to be written into the function that is going to be a thread. This is a little different than what I was thinking. I’m reading the information from here http://www.digitalmars.com/rtl/process.html but I’m kind of confused. What’s the difference between _beginthread and _spawn? spawn looks like it might be the better choice, but maybe I missed something when reviewing it. I also didn’t see _beginthreadex() anywhere on that page. Maybe it’s too old?

I’m also assuming that I’ll have to wrap any variables into their own thread safe class to prevent them from being accessed while being used. I’m just trying to get a grasp of this before I jump head first into coding since C isn’t a strong point for me at all.

Edit: Did some digging on SO, and found more information between _beginthread() and _beginthreadex(). I am most definitely using the later, however, I need to research the «security» parameter. Ugh.

tdm doesn’t seem to have std::thread support

C:UsersSeanDownloads>mingw32-g++ -v
Using built-in specs.
COLLECT_GCC=mingw32-g++
COLLECT_LTO_WRAPPER=c:/mingw32/bin/../libexec/gcc/mingw32/4.7.1/lto-wrapper.exe
Target: mingw32
Configured with: ../../src/gcc-4.7.1/configure --build=mingw32 --enable-language
s=c,c++,ada,fortran,objc,obj-c++ --enable-threads=win32 --enable-libgomp --enabl
e-lto --enable-fully-dynamic-string --enable-libstdcxx-debug --enable-version-sp
ecific-runtime-libs --with-gnu-ld --disable-nls --disable-win32-registry --disab
le-symvers --disable-build-poststage1-with-cxx --disable-werror --prefix=/mingw3
2tdm --with-local-prefix=/mingw32tdm --enable-cxx-flags='-fno-function-sections
-fno-data-sections' --with-pkgversion=tdm-1 --enable-sjlj-exceptions --with-bugu
rl=http://tdm-gcc.tdragon.net/bugs
Thread model: win32
gcc version 4.7.1 (tdm-1)

Same with nugen

C:MinGW>g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/i686-pc-mingw32/4.7.2/lto-wrappe
r.exe
Target: i686-pc-mingw32
Configured with: ../src/configure --prefix=/c/temp/gcc/dest --with-gmp=/c/temp/g
cc/gmp --with-mpfr=/c/temp/gcc/mpfr --with-mpc=/c/temp/gcc/mpc --enable-language
s=c,c++ --with-arch=i686 --with-tune=generic --disable-libstdcxx-pch --disable-n
ls --disable-shared --disable-sjlj-exceptions --disable-win32-registry --enable-
checking=release --enable-lto
Thread model: win32
gcc version 4.7.2 (GCC)

They both give this error

C:UsersSeanDownloads>g++ thread.cpp
thread.cpp: In function 'int main()':
thread.cpp:6:2: error: 'thread' is not a member of 'std'
thread.cpp:6:14: error: expected ';' before 't'
thread.cpp:6:55: error: expected primary-expression before ')' token
thread.cpp:6:55: error: expected ';' before ')' token

With this code

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#include <iostream>
#include <thread>

int main()
{
	std::thread t([](){std::cout<<"hello from thread 2";});
	std::cout<<"hello from thread 1"<<std::endl;
}

</3 <— My hopes of using C++11 Threads.

Sigh, this isn’t going to be easy, but it’ll be one more thing, like STL list, that I can add to my arsenal of code. I’m starting to understand MSDN on this one (first article I might have ever understood in it’s entirety)…wait…does that mean I’m actually learning to think properly?

You can do what I do and simply swap out std::thread with boost::thread. The APIs for each are 100% identical as far as I’ve been able to tell (I’ve been using my C++11 reference when writing boost code and it hasn’t failed me yet)

You can also hide the namespace you’re using so that it can be easily swapped out if/when you use a compiler that supports std::thread.

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namespace thd = boost;  // or = std if std::thread is supported

thd::thread  yourthread(...);

Sounds like a plan. I’m just so disappointed in MinGW about this whole thing. It supports threads, uses Win32 threading, but it doesn’t exist to be used…

I also believe I’m going to be taking a break from programming to work on learning some more of my scripting language. My scripts are in high demand all of a sudden.

I know I’ve successfully compiled some projects using std::thread for Windows before. I recall that it was indeed not TDM, but a 4.7 nightly. Either it had special patches or std::thread (or rather, gthread) support was removed before the final release. Either way, it’s frustrating.

Besides using boost as a drop-in, these patches might be worth a try:
http://tehsausage.com/mingw-std-thread-gcc-4-7
The advantage is that they wouldn’t require building MinGW yourself.

I tried the patches and using the same code as above (and used the suggested libraries) I get this:

terminate called without an active exception

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

Process returned 3 (0x3)   execution time : 0.172 s
Press any key to continue.

Now, it’s very possible I did something wrong, but from reading it, it seems pretty straight forward. I’m wondering if it’s not compatible with 4.7.2. What version did you use? 4.7.0?

There was also a note about MinGW64 threads being more compatible, but I have a 32bit system. I won’t be able to use a 64 bit compiler, will I?

I’m also having std::thread problems with gcc-4.7.2 in linux. This code compiles and runs with boost but not std thread.

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#include <iostream>
#include <thread>
//#include <boost/thread.hpp>

namespace thrd = std;

int main()
{
	thrd::thread t([](){std::cout<<"thread2"<<std::endl;});
	std::cout<<"thread1"<<std::endl;
	t.join();
}

Using std::thread gives this output.

sean@sean-virtual-machine:~/Desktop$ g++ --std=c++0x thread.cpp
sean@sean-virtual-machine:~/Desktop$ ./a.out 
terminate called after throwing an instance of 'std::system_error'
  what():  Operation not permitted
Aborted (core dumped)

So it looks like for now, for me at least, it’s VS2012 or boost for threading.

I guess why code::blocks used a GCC package with no thread support under windows.

If I try to compile the following:

#include <iostream>
#include <thread>

void foo(){
std::cout<<«hello thread»<<std::endl;
}

int main(){
    std::thread myT(foo);
    myT.join();
    return 0;
}

I get the error «thread is not a member of std»

I already have the flag
«-std=C++11»
in compile options.

« Last Edit: April 21, 2013, 09:49:52 pm by demone »

Logged

processor: Intel Core 2 Quad.
ram: 4 GB
os: Vista
gfx card: Ati Radeon HD 5570

the TDM mingW port indeed does not support std::thread, short : LGPL issues and so on.

Logged

oh my bad that’s really freaking. Ok I have than to swap to Linux partition.
is there any chance to add support for std::thread ever in GCC at this point?

Logged

processor: Intel Core 2 Quad.
ram: 4 GB
os: Vista
gfx card: Ati Radeon HD 5570

oh my bad that’s really freaking. Ok I have than to swap to Linux partition.
is there any chance to add support for std::thread ever in GCC at this point?

That’s not the right place to ask.
We do not build vompilers just an IDE, that works with many compilers.
We ship with a TDM’s gcc on windows to make it easy to start coding for beginners (and most other users) without the need to explicitely download a compiler.

So you as user are free to use any supported compiler, with or without std:thread-support.

Logged

We do not build vompilers just an IDE, that works with many compilers.

That sounds scary… if I install one, will it suck the blood from my computer?

Logged

That sounds scary… if I install one, will it suck the blood from my computer?

You’ve never heard of garlic AV suite? The first AV solution at all?

— osdt

Logged

zabzonk

Logged

Падение -анси, это означает -std = c ++ 98, что вам явно не нужно. Это также вызывает макрос __STRICT_ANSI__ должны быть определены, и это может изменить поведение заголовков, например, отключив поддержку C ++ 0x.

c++11 required? thread not a member of std error

void Test::test() {
    cout << "yippie it works " << endl;
}

int main(int, char**)
{
    Test t1{3};
    std::thread t(test);
}

Re: c++11 required? thread error

Mon Jan 26, 2015 5:51 pm

$ g++ -std=c++0x test.cpp -pthread

She who travels light — forgot something.
Please note that my name doesn’t start with the @ character so can people please stop writing it as if it does!

Re: c++11 required? thread error

Mon Jan 26, 2015 7:09 pm