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Re: [Mingw-users] Mingw Sockets Library Semaphore.h

From: Daniel Kovacevic <dkovacevic10@gm...> - 2011-06-27 12:24

I added the "libpthreadGC2.a" lib and the "libpthreadGCE2.a" lib
hoping that they were the missing libraries that pthreads in
semaphore.h was referencing.

No, I don't know whether or not I need to add more libraries to the
compiler. The Sockets library said that you have to add libwsock32.a
and libws2_32.a; no other libs were mentioned
(http://www.alhem.net/Sockets/tutorial/install.html). Of course, the
instructions were written with the assumption that you are attempting
to compile under cygwin, which I am not. Could that be why the
pthreads lib is missing?

Is there another pthreads lib I should be using? I retrieved
libwsock32.a and libws2_32.a from the system32 directory, but I wasn't
able to find a "libpthreads.dll" in there.

On 6/24/11, JonY <jon_y@...> wrote:
> On 6/25/2011 01:47, Daniel Kovacevic wrote:
>> I want to add the Sockets library (version 2.3.9.5) at
>> http://www.alhem.net/Sockets/index.html to my compiler (Mingw32 version
>> 4.5.2).
>>
>> I am not using cygwin, I am using the windows port of mingw32.
>>
>> I was able to compile the library using mingw32-make.
>>
>> However, I am having difficulty in compiling an example that came with the
>> library source. Specifically, "echoserver.cpp".
>>
>> When I initially tried to compile this program, I did not tell mingw where
>> the newly compiled library was; obviously a lot of errors where thrown.
>>
>> I looked into how to add said library to mingw.
>>
>> With that info, I decided to dump the library into the <mingw install
>> root>\lib directory. I included all of the .o and .d files along with
>> "libSockets.a".
>>
>
> Only the .a file is needed.
>
>> Next, I dumped everything else (.cpp, .h) into the <mingw install
>> root>\include directory. Here I had one problem crop up- "semaphore.h" was
>> a
>> duplicate (it was in the newly compiled directory, and there was a copy in
>> the <mingw install root>\include directory).
>>
>
> I believe the mingw semaphore.h is part of pthreads. I suggest you use
> -I and -L to add to the GCC search path instead of clobbering your mingw
> install.
>
>>
>> [code]
>>
>>
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0xfe): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x1ad): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x2dc): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x38b): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI15HttpDebugSocketE4BindER13SocketAddressRKSsi[ListenSocket<HttpDebugSocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0xfe): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI15HttpDebugSocketE4BindER13SocketAddressRKSsi[ListenSocket<HttpDebugSocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x1ad): more undefined references to `StrError(int)' follow
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o): In
>> function `Thread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:54:
>> undefined reference to `Semaphore::Semaphore(long)'
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:73:
>> undefined reference to `Semaphore::Post()'
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:54:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o): In
>> function `~Thread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:77:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:146:
>> undefined reference to `Semaphore::Post()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o): In
>> function `~Thread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:77:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:170:
>> undefined reference to `Semaphore::Wait()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:341:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:290:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:293:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:299:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:302:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:63:
>> undefined reference to `Semaphore::Post()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):
>> In function `~SocketHandlerThread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:48:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):
>> In function `SocketHandlerThread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:43:
>> undefined reference to `Semaphore::Semaphore(long)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:75:
>> undefined reference to `Semaphore::Wait()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:371:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:556:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:531:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:229:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:327:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:581:
>> more undefined references to `StrError(int)' follow
>> collect2: ld returned 1 exit status
>>
>> [/code]
>>
>
> Are you sure its just libSockets.a? The Semaphore class has to come from
> somewhere, unless its a template only class in semaphore.h.
>
>

Thread View

Thread	Author	Date
[Mingw-users] Mingw Sockets Library Semaphore.h	Daniel Kovacevic <dkovacevic10@gm...>

[Mingw-users] mingw app runs without pthreads.. but stops with

From: KURT PETERS <peterskurt@ms...> - 2011-06-25 00:27

Attachments: Message as HTML

I'm trying to run a function in a thread using pthreads. I'm using pthreadGCE2 as the library, but I've also tried CVE2 and just GC2 and VC2.  The program runs fine with no threads, but when I try to run it with using threads to call the function, the program just terminates.  I added a -D_REENTRANT to the compiler as well to try to solve the problem.
This is what's built:
make all 
'Building target: scpitranslator'
'Invoking: MinGW C Linker'
gcc -L"C:\eclipse\workspacens\lib\msc" -L"C:\eclipse\workspacens\lib\bc" -L"C:\eclipse\workspacens\lib\pthreadlib" -o"scpitranslator"  ./src/scpitranslator.o   -lvisa32 -lpthreadVC2
'Finished building target: scpitranslator'

The program has MANY printf's before the thread is created, etc., but those don't even get printed out.  I'm not sure what I'm doing wrong.
This is the termination stack that I see:
<terminated, exit value: -1073741515>C:\eclipse\workspacens\scpitranslator\Default\scpitranslator.exe (6/24/11 6:20 PM)    

I've degenerated to running an example function in a thread, instead of my function:
void *BusyWork(void *t)
{
   int i;
   long tid;
   double result=0.0;
   tid = (long)t;
   printf("Thread %ld starting...\n",tid);
   for (i=0; i<1000000; i++)
   {
      result = result + sin(i) * tan(i);
   }
   printf("Thread %ld done. Result = %e\n",tid, result);
   pthread_exit((void*) t);
   return NULL;
}

And the program still doesn't run.
Any thoughts?
Regards,
Kurt

Re: [Mingw-users] mingw app runs without pthreads.. but stops with

From: KURT PETERS <peterskurt@ms...> - 2011-06-25 00:46

Attachments: Message as HTML

Kurt Peters said:
From: peterskurt@...
To: mingw-users@...
Date: Fri, 24 Jun 2011 18:27:15 -0600
Subject: [Mingw-users] mingw app runs without pthreads.. but stops with

I'm trying to run a function in a thread using pthreads. I'm using pthreadGCE2 as the library, but I've also tried CVE2 and just GC2 and VC2.  The program runs fine with no threads, but when I try to run it with using threads to call the function, the program just terminates.  I added a -D_REENTRANT to the compiler as well to try to solve the problem.
This is what's built:
make all 
'Building target: scpitranslator'
'Invoking: MinGW C Linker'
gcc -L"C:\eclipse\workspacens\lib\msc" -L"C:\eclipse\workspacens\lib\bc" -L"C:\eclipse\workspacens\lib\pthreadlib" -o"scpitranslator"  ./src/scpitranslator.o   -lvisa32 -lpthreadVC2
'Finished building target: scpitranslator'

The program has MANY printf's before the thread is created, etc., but those don't even get printed out.  I'm not sure what I'm doing wrong.
This is the termination stack that I see:
<terminated, exit value: -1073741515>C:\eclipse\workspacens\scpitranslator\Default\scpitranslator.exe (6/24/11 6:20 PM)    

I've degenerated to running an example function in a thread, instead of my function:
void *BusyWork(void *t)
{
   int i;
   long tid;
   double result=0.0;
   tid = (long)t;
   printf("Thread %ld starting...\n",tid);
   for (i=0; i<1000000; i++)
   {
      result = result + sin(i) * tan(i);
   }
   printf("Thread %ld done. Result = %e\n",tid, result);
   pthread_exit((void*) t);
   return NULL;
}

And the program still doesn't run.
Any thoughts?
Regards,
Kurt

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Well, I got it working but had to actually COPY the respective VC.dll into the same directory as the compiled program.   Why wasn't the library compiled into one file?  Is there an easy way to do that?
Kurt

Re: [Mingw-users] mingw app runs without pthreads.. but stops with

From: JonY <jon_y@us...> - 2011-06-25 01:29

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Re: [Mingw-users] Mingw Sockets Library Semaphore.h

From: JonY <jon_y@us...> - 2011-06-25 01:34

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Re: [Mingw-users] mingw app runs without pthreads.. but stops with

From: KURT PETERS <peterskurt@ms...> - 2011-06-25 03:10

Attachments: Message as HTML

Date: Sat, 25 Jun 2011 09:07:57 +0800
From: jon_y@...
To: mingw-users@...
Subject: Re: [Mingw-users] mingw app runs without pthreads.. but stops with

Hi,

Please do not hijack threads, you can do this by starting a new thread
instead of replying to an existing thread.

Thread hijacking is considered very rude and counterproductive to search
engines.

WTF are you talking about.  I didn't hijack anything.

Re: [Mingw-users] mingw app runs without pthreads.. but stops with

From: JonY <jon_y@us...> - 2011-06-25 04:09

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Re: [Mingw-users] Mingw Sockets Library Semaphore.h

From: Daniel Kovacevic <dkovacevic10@gm...> - 2011-06-27 12:24

I added the "libpthreadGC2.a" lib and the "libpthreadGCE2.a" lib
hoping that they were the missing libraries that pthreads in
semaphore.h was referencing.

No, I don't know whether or not I need to add more libraries to the
compiler. The Sockets library said that you have to add libwsock32.a
and libws2_32.a; no other libs were mentioned
(http://www.alhem.net/Sockets/tutorial/install.html). Of course, the
instructions were written with the assumption that you are attempting
to compile under cygwin, which I am not. Could that be why the
pthreads lib is missing?

Is there another pthreads lib I should be using? I retrieved
libwsock32.a and libws2_32.a from the system32 directory, but I wasn't
able to find a "libpthreads.dll" in there.

On 6/24/11, JonY <jon_y@...> wrote:
> On 6/25/2011 01:47, Daniel Kovacevic wrote:
>> I want to add the Sockets library (version 2.3.9.5) at
>> http://www.alhem.net/Sockets/index.html to my compiler (Mingw32 version
>> 4.5.2).
>>
>> I am not using cygwin, I am using the windows port of mingw32.
>>
>> I was able to compile the library using mingw32-make.
>>
>> However, I am having difficulty in compiling an example that came with the
>> library source. Specifically, "echoserver.cpp".
>>
>> When I initially tried to compile this program, I did not tell mingw where
>> the newly compiled library was; obviously a lot of errors where thrown.
>>
>> I looked into how to add said library to mingw.
>>
>> With that info, I decided to dump the library into the <mingw install
>> root>\lib directory. I included all of the .o and .d files along with
>> "libSockets.a".
>>
>
> Only the .a file is needed.
>
>> Next, I dumped everything else (.cpp, .h) into the <mingw install
>> root>\include directory. Here I had one problem crop up- "semaphore.h" was
>> a
>> duplicate (it was in the newly compiled directory, and there was a copy in
>> the <mingw install root>\include directory).
>>
>
> I believe the mingw semaphore.h is part of pthreads. I suggest you use
> -I and -L to add to the GCC search path instead of clobbering your mingw
> install.
>
>>
>> [code]
>>
>>
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0xfe): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x1ad): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x2dc): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI8MySocketE4BindER13SocketAddressRKSsi[ListenSocket<MySocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x38b): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI15HttpDebugSocketE4BindER13SocketAddressRKSsi[ListenSocket<HttpDebugSocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0xfe): undefined reference to `StrError(int)'
>> C:\Users\DKOVAC~1\AppData\Local\Temp\ccAO9Vef.o:echoserver.cpp:(.text$_ZN12ListenSocketI15HttpDebugSocketE4BindER13SocketAddressRKSsi[ListenSocket<HttpDebugSocket>::Bind(SocketAddress&,
>> std::basic_string<char, std::char_traits<char>, std::allocator<char> >
>> const&, int)]+0x1ad): more undefined references to `StrError(int)' follow
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o): In
>> function `Thread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:54:
>> undefined reference to `Semaphore::Semaphore(long)'
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:73:
>> undefined reference to `Semaphore::Post()'
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:54:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o): In
>> function `~Thread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:77:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:146:
>> undefined reference to `Semaphore::Post()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o): In
>> function `~Thread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:77:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(Thread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/Thread.cpp:170:
>> undefined reference to `Semaphore::Wait()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:341:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:290:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:293:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:299:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(ResolvServer.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/ListenSocket.h:302:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:63:
>> undefined reference to `Semaphore::Post()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):
>> In function `~SocketHandlerThread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:48:
>> undefined reference to `Semaphore::~Semaphore()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):
>> In function `SocketHandlerThread':
>> c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:43:
>> undefined reference to `Semaphore::Semaphore(long)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(SocketHandlerThread.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/SocketHandlerThread.cpp:75:
>> undefined reference to `Semaphore::Wait()'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:371:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:556:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:531:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:229:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:327:
>> undefined reference to `StrError(int)'
>> c:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libSockets.a(UdpSocket.o):c:\Users\dkovacevic\Downloads\Binaries_and_Sources\C++\Sockets-2.3.9.5/UdpSocket.cpp:581:
>> more undefined references to `StrError(int)' follow
>> collect2: ld returned 1 exit status
>>
>> [/code]
>>
>
> Are you sure its just libSockets.a? The Semaphore class has to come from
> somewhere, unless its a template only class in semaphore.h.
>
>

Re: [Mingw-users] Mingw Sockets Library Semaphore.h

From: Charles Wilson <cwilso11@us...> - 2011-06-28 05:13

On 6/27/2011 8:24 AM, Daniel Kovacevic wrote:
> I added the "libpthreadGC2.a" lib and the "libpthreadGCE2.a" lib
> hoping that they were the missing libraries that pthreads in
> semaphore.h was referencing.

Yes, they are.  But you only want one of them -- probably -lpthreadGC2
(which is what you get with -lpthread).  -lpthreadGCE2 is an
experimental version that uses C++ exceptions...

However, it's too early to be using these versions of pthreads, unless
you're a lot more experienced with porting software to win32 than it
appears from this thread.

> No, I don't know whether or not I need to add more libraries to the
> compiler. The Sockets library said that you have to add libwsock32.a
> and libws2_32.a; no other libs were mentioned
> (http://www.alhem.net/Sockets/tutorial/install.html). Of course, the
> instructions were written with the assumption that you are attempting
> to compile under cygwin, which I am not. Could that be why the
> pthreads lib is missing?

Yes and no.  On cygwin, pthread functionality is built in to the cygwin
runtime, so -lpthread is not needed (even if pthreads ARE used by the
application).  On mingw, you need to explicitly link in a library that
provides the pthread functionality.

However, you're missing one big thing: MinGW gcc is not some magic genie
that can automatically take a unix program and "make it work" on
windows.  If the unix program uses POSIX functionality, then it won't
compile -- MinGW is *minimal*, it doesn't provide the POSIX stuff that
is missing on win32 (*cygwin* does that).  MinGW is for compiled apps
that only require what win32 provides.

You'll need to actually PORT the application to windows.  This means
stuff as simple as
	#include <io.h> and <process.h> instead of <unistd.h>
(actually, MinGW provides a stuff unistd.h that does this for you, but
MSVC doesn't)

...or as complex as ripping out all posix networking code and replacing
it with winsock calls. OR ripping out all the unix signal handling code
and replacing it with Win32 Message loops.

> Is there another pthreads lib I should be using? I retrieved
> libwsock32.a and libws2_32.a from the system32 directory, but I wasn't
> able to find a "libpthreads.dll" in there.

There are two different pthreads packages right now.  The current one is
shipped with mingw gcc 4.5.2 and is:
	/mingw/bin/libpthread-2.dll
	/mingw/lib/libpthread.dll.a
        /mingw/include/pthread.h
        /mingw/include/sched.h
        /mingw/include/semaphore.h

That's the one you should be using for now -- NOT the DLLs/libs from the
pthreads-w32 website. To make sure our version is installed, do
	mingw-get install pthreads-w32

The next version of GCC will support the new pthreads packages -- which
will be more similar (identical?) to the ones at the pthreads-w32
website.  For now, this 'new' version is here:
	http://mingw.cwilson.fastmail.fm/
but you should wait until mingw gcc-$NEXT is released before using that one.

--
Chuck

Re: [Mingw-users] Mingw Sockets Library Semaphore.h

From: Daniel Kovacevic <dkovacevic10@gm...> - 2011-06-28 15:06

Wow, I learned a lot from this.

Thank you for your explanation, Chuck.

On 6/28/11, Charles Wilson <cwilso11@...> wrote:
> On 6/27/2011 8:24 AM, Daniel Kovacevic wrote:
>> I added the "libpthreadGC2.a" lib and the "libpthreadGCE2.a" lib
>> hoping that they were the missing libraries that pthreads in
>> semaphore.h was referencing.
>
> Yes, they are.  But you only want one of them -- probably -lpthreadGC2
> (which is what you get with -lpthread).  -lpthreadGCE2 is an
> experimental version that uses C++ exceptions...
>
> However, it's too early to be using these versions of pthreads, unless
> you're a lot more experienced with porting software to win32 than it
> appears from this thread.
>
>> No, I don't know whether or not I need to add more libraries to the
>> compiler. The Sockets library said that you have to add libwsock32.a
>> and libws2_32.a; no other libs were mentioned
>> (http://www.alhem.net/Sockets/tutorial/install.html). Of course, the
>> instructions were written with the assumption that you are attempting
>> to compile under cygwin, which I am not. Could that be why the
>> pthreads lib is missing?
>
> Yes and no.  On cygwin, pthread functionality is built in to the cygwin
> runtime, so -lpthread is not needed (even if pthreads ARE used by the
> application).  On mingw, you need to explicitly link in a library that
> provides the pthread functionality.
>
> However, you're missing one big thing: MinGW gcc is not some magic genie
> that can automatically take a unix program and "make it work" on
> windows.  If the unix program uses POSIX functionality, then it won't
> compile -- MinGW is *minimal*, it doesn't provide the POSIX stuff that
> is missing on win32 (*cygwin* does that).  MinGW is for compiled apps
> that only require what win32 provides.
>
> You'll need to actually PORT the application to windows.  This means
> stuff as simple as
> 	#include <io.h> and <process.h> instead of <unistd.h>
> (actually, MinGW provides a stuff unistd.h that does this for you, but
> MSVC doesn't)
>
> ...or as complex as ripping out all posix networking code and replacing
> it with winsock calls. OR ripping out all the unix signal handling code
> and replacing it with Win32 Message loops.
>
>> Is there another pthreads lib I should be using? I retrieved
>> libwsock32.a and libws2_32.a from the system32 directory, but I wasn't
>> able to find a "libpthreads.dll" in there.
>
> There are two different pthreads packages right now.  The current one is
> shipped with mingw gcc 4.5.2 and is:
> 	/mingw/bin/libpthread-2.dll
> 	/mingw/lib/libpthread.dll.a
>         /mingw/include/pthread.h
>         /mingw/include/sched.h
>         /mingw/include/semaphore.h
>
> That's the one you should be using for now -- NOT the DLLs/libs from the
> pthreads-w32 website. To make sure our version is installed, do
> 	mingw-get install pthreads-w32
>
>
> The next version of GCC will support the new pthreads packages -- which
> will be more similar (identical?) to the ones at the pthreads-w32
> website.  For now, this 'new' version is here:
> 	http://mingw.cwilson.fastmail.fm/
> but you should wait until mingw gcc-$NEXT is released before using that one.
>
> --
> Chuck
>
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