Non Portable pthread (-np) API for thread creation in suspend mode

Dear All,

I have implemented a threading program using the pthread library on CentOS - 5.2 Linux system. (The CentOS
is an Enterprise Linux distribution based on the freely available sources from Red Hat Enterprise
Linux.) However, I need to create a pthread that is initially suspended. But, I did not find any API in the
pthread library which does the my requirement. So, I googled and found some of the FreeBSD thread API which
is as follows.

pthread_attr_setcreatesuspend_np
pthread_suspend_np
pthread_resume_np 

pthread_attr_setcreatesuspend_np  - prepare attribute for creation of suspended thread. I have also
seen that the "_np" stands for "non portable" API. (The functions with the pthread_ prefix and _np suffix
are not portable extensions to POSIX threads.)

My question is, how can I use the "_np" API on my Linux box. I guess, the "_np" API is available in "libthr"
shared library. So, I tried to download the "libthr" shared library, but there is no luck to me. 

I have also one more question, Shall I use the "libthr" shared library on my CENTOS without affecting the
"libpthread" library. If possible, please suggest me.

I can also able to implement the suspend and resume functionality with the following mechanism. But I have
also seen that with "libthr" we get better performance than "libpthread". Please look at the following
link. That is the reason, I want to use the "libthr" on my CENTOS Linux box.

http://www.dslreports.com/forum/r19082719-FreeBSD-libthr-libpthread

static int ready_to_go = 0;
static pthread_mutex_t suspend_mutex = PTHREAD_MUTEX_INITIALIZER;