[BUGS] osx and thread safety?

Can someone shed some light on the thread safety
switch. I am using PostgreSQL on mac os x. I have made
and installed from 7.2 through 8.0b. I now see this
feature of thread safety and I don't understand why I
would need it.

I have tried:

../configure --with-rendezvous --enable-thread-safety

I get these errors:

ld: common symbols not allowed with MH_DYLIB output
format with the -multi_module option
fe-secure.o definition of common _thread_in_send (size
4)
/usr/bin/libtool: internal link edit command failed
make[3]: *** [libpq.3.2.dylib] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all] Error 2
make: *** [all] Error 2

this is os x 10.3.5 with gcc (GCC) 3.3

any ideas (If I don't know what it is, do I need it?)

Ted




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You need threading if you need to do threads in your client
applications. Not sure why you get the link error though.

---------------------------------------------------------------------------

Theodore Petrosky wrote:

Can someone shed some light on the thread safety
switch. I am using PostgreSQL on mac os x. I have made
and installed from 7.2 through 8.0b. I now see this
feature of thread safety and I don't understand why I
would need it.

I have tried:

./configure --with-rendezvous --enable-thread-safety

I get these errors:

ld: common symbols not allowed with MH_DYLIB output
format with the -multi_module option
fe-secure.o definition of common _thread_in_send (size
4)
/usr/bin/libtool: internal link edit command failed
make[3]: *** [libpq.3.2.dylib] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all] Error 2
make: *** [all] Error 2

this is os x 10.3.5 with gcc (GCC) 3.3

any ideas (If I don't know what it is, do I need it?)

Ted




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Theodore Petrosky <tedpet5 (AT) yahoo (DOT) com> writes:

I get these errors:

ld: common symbols not allowed with MH_DYLIB output
format with the -multi_module option
fe-secure.o definition of common _thread_in_send (size
4)

Some googling turns up the fact that OS X does not like uninitialized
global variables in dynamic libraries. There are a couple of
workarounds but the easiest one seems to be to initialize the variable.
I added "= 0" to the definition of thread_in_send and the problem
went away.

It's possible that this would create issues on platforms where
type pthread_key_t is neither integral nor a pointer type. Does
anyone know of such?

regards, tom lane

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