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[Linux-cluster] What can cause dlm_pthread_init to generate an errno 13?

Hi -

I must be very dumb.  I'm unable to do what I would consider to be the
"Hello World" of user mode dlm.

[ejohnson gfsa01:~/projects/dlm-simple] cat foo.cpp
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>

extern "C" {
 #include <libdlm.h>
#include <pthread.h>

main(int argc, char **argv)
 printf("hello world\n");
 char lockName[] = "foobar" ;

 int initStatus = dlm_pthread_init();
 printf("initStatus: %d, errno: %d\n",initStatus,errno);

 int lockid =0 ;
 int status = lock_resource( lockName, LKM_EXMODE, 0, &lockid ) ;
 printf("status: %d, errno: %d\n",status,errno);
[ejohnson gfsa01:~/projects/dlm-simple] touch foo.cpp

[ejohnson gfsa01:~/projects/dlm-simple] make
g++ -D_REENTRANT foo.cpp -o foo -ldlm -lpthread
./foo/home/dev/util/linux64/bin/ld: skipping incompatible
when searching for -lstdc++

[ejohnson gfsa01:~/projects/dlm-simple] ./foo
hello world
initStatus: -1, errno: 13
status: -1, errno: 13

I have googled around endlessly and been unable to find any insight as
to what it is that I'm missing.

I'll gladly take a terse - "Hey knucklehead, go read this page in more detail."


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