pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Albert Chin]

$ uname -a
OSF1 [name] V4.0 878 alpha
$ uname -a
OSF1 [name] V5.1 732 alpha

$ cat mutex.c
#include <stdlib.h>
#include <pthread.h>

int
main (void) {
  pthread_mutex_t lck;

  if (pthread_mutex_init(&lck, 0) != 0)
    exit (2);
  if (pthread_mutex_lock(&lck) != 0)
    exit (3);
  if (pthread_mutex_unlock(&lck) != 0)
    exit (4);
  if (pthread_mutex_destroy(&lck) != 0)
    exit (5);

  exit (0);
}

$ cc mutex.c
ld:
Unresolved:
__pthread_mutex_init
__pthread_mutex_destroy
__pthread_mutex_lock
__pthread_mutex_unlock
$ cc -pthread mutex.c
$ ls -ld a.out
-rwxrwxr-x   1 china    china      20288 Jul  8 18:40 a.out
$ nm a.out | grep pthread_mutex
__pthread_mutex_destroy          | 0000000000000000 | U | 0000000000000008
__pthread_mutex_init             | 0000000000000000 | U | 0000000000000008
__pthread_mutex_lock             | 0000000000000000 | U | 0000000000000008
__pthread_mutex_unlock           | 0000000000000000 | U | 0000000000000008

$ /opt/TWWfsw/gcc343/bin/gcc -v
Reading specs from
/opt/TWWfsw/gcc343/lib/gcc/alpha-dec-osf5.1/3.4.3/specs
Configured with: /opt/build/gcc-3.4.3/configure --enable-nls
--with-included-gettext --enable-shared --enable-threads
--host=alpha-dec-osf5.1 --with-local-prefix=/opt/TWWfsw/gcc343
--prefix=/opt/TWWfsw/gcc343
Thread model: posix
gcc version 3.4.3 (TWW)
$ /opt/TWWfsw/gcc343/bin/gcc mutex.c
$ ls -ld a.out
-rwxrwxr-x   1 china    china      41072 Jul  8 18:40 a.out
$ nm a.out | grep pthread_mutex
__pthread_mutex_destroy          | 0000004831844816 | T | 0000000000000008
__pthread_mutex_init             | 0000004831844800 | T | 0000000000000008
__pthread_mutex_lock             | 0000004831844640 | T | 0000000000000008
__pthread_mutex_trylock          | 0000004831844656 | T | 0000000000000008
__pthread_mutex_unlock           | 0000004831844672 | T | 0000000000000008

$ /opt/TWWfsw/gcc332/bin/gcc -v
Reading specs from
/opt/TWWfsw/gcc332/lib/gcc-lib/alphaev67-dec-osf5.1/3.3.2/specs
Configured with: /opt/build/gcc-3.3.2/configure --enable-nls
--with-included-gettext --enable-shared --enable-threads
--with-local-prefix=/opt/TWWfsw/gcc332 --prefix=/opt/TWWfsw/gcc332
Thread model: single
gcc version 3.3.2 (TWW)
$ /opt/TWWfsw/gcc332/bin/gcc mutex.c
__pthread_mutex_init
__pthread_mutex_lock
__pthread_mutex_unlock
__pthread_mutex_destroy
collect2: ld returned 1 exit status

So, why does /opt/TWWfsw/gcc343/bin/gcc resolve the pthread_mutex_*
symbols and cc does not? Should the GCC behavior mirror the cc
behavior?

-- 
albert chin (china@thewrittenword.com)

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Ishwar Rattan]

On Fri, 8 Jul 2005, Albert Chin wrote:

> $ uname -a
> OSF1 [name] V4.0 878 alpha
> $ uname -a
> OSF1 [name] V5.1 732 alpha
>
> $ cat mutex.c
> #include <stdlib.h>
> #include <pthread.h>
>
> int
> main (void) {
>   pthread_mutex_t lck;
>
>   if (pthread_mutex_init(&lck, 0) != 0)
>     exit (2);
>   if (pthread_mutex_lock(&lck) != 0)
>     exit (3);
>   if (pthread_mutex_unlock(&lck) != 0)
>     exit (4);
>   if (pthread_mutex_destroy(&lck) != 0)
>     exit (5);
>
>   exit (0);
> }
>
> $ cc mutex.c

Try cc mutex.c -lpthread

-ishwar

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Albert Chin]

On Sat, Jul 09, 2005 at 09:15:18AM -0400, Ishwar Rattan wrote:
> 
> 
> On Fri, 8 Jul 2005, Albert Chin wrote:
> 
> > $ uname -a
> > OSF1 [name] V4.0 878 alpha
> > $ uname -a
> > OSF1 [name] V5.1 732 alpha
> >
> > $ cat mutex.c
> > #include <stdlib.h>
> > #include <pthread.h>
> >
> > int
> > main (void) {
> >   pthread_mutex_t lck;
> >
> >   if (pthread_mutex_init(&lck, 0) != 0)
> >     exit (2);
> >   if (pthread_mutex_lock(&lck) != 0)
> >     exit (3);
> >   if (pthread_mutex_unlock(&lck) != 0)
> >     exit (4);
> >   if (pthread_mutex_destroy(&lck) != 0)
> >     exit (5);
> >
> >   exit (0);
> > }
> >
> > $ cc mutex.c
> 
> Try cc mutex.c -lpthread

I know. I'm curious why:
  $ /opt/TWWfsw/gcc343/bin/gcc mutex.c
succeeds. I'd expect it to fail, just as 'cc mutex.c' failed.

-- 
albert chin (china@thewrittenword.com)

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Ishwar Rattan]

On Sat, 9 Jul 2005, Albert Chin wrote:

> I know. I'm curious why:
>   $ /opt/TWWfsw/gcc343/bin/gcc mutex.c
> succeeds. I'd expect it to fail, just as 'cc mutex.c' failed.
Try /opt/TWWfsw/gcc343/bin/gcc -v | grep thread

-ishwar

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Albert Chin]

On Sat, Jul 09, 2005 at 01:24:58PM -0400, Ishwar Rattan wrote:
> 
> On Sat, 9 Jul 2005, Albert Chin wrote:
> 
> > I know. I'm curious why:
> >   $ /opt/TWWfsw/gcc343/bin/gcc mutex.c
> > succeeds. I'd expect it to fail, just as 'cc mutex.c' failed.
> Try /opt/TWWfsw/gcc343/bin/gcc -v | grep thread

Reading specs from
/opt/TWWfsw/gcc343/lib/gcc/alpha-dec-osf5.1/3.4.3/specs
Configured with: /opt/build/gcc-3.4.3/configure --enable-nls
--with-included-gettext --enable-shared --enable-threads
--host=alpha-dec-osf5.1 --with-local-prefix=/opt/TWWfsw/gcc343
--prefix=/opt/TWWfsw/gcc343
Thread model: posix
gcc version 3.4.3 (TWW)

Does it succeed because I compiled with --enable-threads?

-- 
albert chin (china@thewrittenword.com)

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Eljay Love-Jensen]

Hi Ishwar,

Use 'gcc -v' while compiling, and 'ldd a.out' to see loader dynamic libraries.

The '-pthreads' does several things. (The '-v' will help clarify what those things are.)

--Eljay

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Albert Chin]

On Mon, Jul 11, 2005 at 06:26:14AM -0500, Eljay Love-Jensen wrote:
> Use 'gcc -v' while compiling, and 'ldd a.out' to see loader dynamic
> libraries.

The previous email gives the /opt/TWWfsw/gcc343/bin/gcc -v output.
'ldd a.out' shows a dependency with libc only.

> The '-pthreads' does several things. (The '-v' will help clarify
> what those things are.)

I'm not building with -pthreads.

-- 
albert chin (china@thewrittenword.com)

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Ishwar Rattan]

On Mon, 11 Jul 2005, Albert Chin wrote:

> On Mon, Jul 11, 2005 at 06:26:14AM -0500, Eljay Love-Jensen wrote:
> > Use 'gcc -v' while compiling, and 'ldd a.out' to see loader dynamic
> > libraries.
>
> The previous email gives the /opt/TWWfsw/gcc343/bin/gcc -v output.
> 'ldd a.out' shows a dependency with libc only.

I first thought that cc linked to /opt/TWWfsw/gcc343/bin/gcc are same.
If /opt/TWWfsw/gcc343/bin/gcc was not built locally then it might have
posix thread library compiled into it?

-ishwar

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Albert Chin]

On Mon, Jul 11, 2005 at 11:11:30AM -0400, Ishwar Rattan wrote:
> On Mon, 11 Jul 2005, Albert Chin wrote:
> 
> > On Mon, Jul 11, 2005 at 06:26:14AM -0500, Eljay Love-Jensen wrote:
> > > Use 'gcc -v' while compiling, and 'ldd a.out' to see loader dynamic
> > > libraries.
> >
> > The previous email gives the /opt/TWWfsw/gcc343/bin/gcc -v output.
> > 'ldd a.out' shows a dependency with libc only.
> 
> I first thought that cc linked to /opt/TWWfsw/gcc343/bin/gcc are same.
> If /opt/TWWfsw/gcc343/bin/gcc was not built locally then it might have
> posix thread library compiled into it?

cc is the compiler from Compaq. /opt/TWWfsw/gcc343/bin/gcc was built
locally. It does not have the posix thread library compiled into it.

-- 
albert chin (china@thewrittenword.com)

Re: pthread_mutex_init() with gcc-3.4.3 on Tru64 UNIX

[Ishwar Rattan]

On Mon, 11 Jul 2005, Albert Chin wrote:

> On Mon, Jul 11, 2005 at 11:11:30AM -0400, Ishwar Rattan wrote:
> > I first thought that cc linked to /opt/TWWfsw/gcc343/bin/gcc are same.
> > If /opt/TWWfsw/gcc343/bin/gcc was not built locally then it might have
> > posix thread library compiled into it?
>
> cc is the compiler from Compaq. /opt/TWWfsw/gcc343/bin/gcc was built
> locally. It does not have the posix thread library compiled into it.

This is the last one: find the switch for gcc for not using built-in
functions for linking and tell it to do so..

-ishwar