Re: How to detect NPTL at compile time

On Fri, Apr 04, 2003 at 02:51:51PM -0800, Wan-Teh Chang wrote:
> Red Hat Linux 9 ships with the NPTL.  Our code
> contains workarounds for LinuxThreads, and I
> want to disable the workarounds if we are compiling
> against NPTL.  How do I detect whether the pthread
> library is LinuxThreads or NPTL at compile time?
> Can I use the glibc version number to determine
> that (i.e., NPTL if glibc 2.3 or higher)?

No.

int isnptl (void)
{
  size_t n = confstr (_CS_GNU_LIBPTHREAD_VERSION, NULL, 0);
  if (n > 0)
    {
      char *buf = alloca (n);
      confstr (_CS_GNU_LIBPTHREAD_VERSION, buf, n);
      if (strstr (buf, "NPTL"))
        return 1;
    }
  return 0;
}

	Jakub