From owner-freebsd-current  Thu Feb 17  7:12:10 2000
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Date: Fri, 18 Feb 2000 02:11:40 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Daniel Eischen <eischen@vigrid.com>
Cc: Thimble Smith <tim@mysql.com>, current@FreeBSD.ORG,
	jasone@FreeBSD.ORG
Subject: Re: pthread.h and unistd.h
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On Thu, 17 Feb 2000, Daniel Eischen wrote:

> On Thu, 17 Feb 2000, Thimble Smith wrote:
> 
> > Hi.  I recently updated from -stable to -current.  I notice now that
> > pthread.h relies on #defines that are in unistd.h; so in order to use
> > pthread_attr_setscope you have to include unistd.h before pthread.h.
> > 
> > Is this standard behaviour?  I'm working with MySQL, and unistd.h is
> > included after pthread.h; should I have that code changed, or should
> > FreeBSD somehow compensate for this?
> 
> I've read the POSIX spec, and it looks like pthread.h should include
> unistd.h so that the #defines you refer to are properly defined. 

It can't include <unistd.h> or even <sys/unistd.h>, at least in
POSX.1-1996, because even the latter defines names that are not reserved
for <pthread.h>.  E.g., <sys/unistd.h> defines SEEK_SET, but the only
non-implementation reserved for <pthread.h> are ones beginning with
pthread_ or PTHREAD_, or ending with _t.

However, including <sys/unistd.h> wouldn't add much to the existing
namespace violation from including <sys/types.h>, <sys/time.h>,
<sys/signal.h>, <limits.h> and <sched.h>.

> Solaris 2.5.1 pthread.h doesn't include <unistd.h> directly, but does
> include <sys/signal.h> which includes <unistd.h>.

This seems to be a bug Solaris 2.5.1.  Our <sys/signal.h> avoids
including <sys/unistd.h> by including <sys/_posix.h> to get more
fundamental feature test macros for the visibility of the POSIX.1b
extensions.

Bruce



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