From: Andy Dougherty <doughera@lafayette.edu>
Date: Tue, 16 Mar 2004 16:38:58 +0000 (-0500)
Subject: Re: Perl and Parrot disagree about sched_yield on Solaris
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=3bf55fe9d8000eec3ee2afa7455b435ffc747d7d;p=p5sagit%2Fp5-mst-13.2.git

Re: Perl and Parrot disagree about sched_yield on Solaris
Message-ID: <Pine.SOL.4.58.0403161635590.27628@maxwell.phys.lafayette.edu>

p4raw-id: //depot/perl@22512
---

diff --git a/hints/solaris_2.sh b/hints/solaris_2.sh
index 7ffc53c..c2a2ede 100644
--- a/hints/solaris_2.sh
+++ b/hints/solaris_2.sh
@@ -345,11 +345,25 @@ case "$usethreads" in
 $define|true|[yY]*)
         ccflags="-D_REENTRANT $ccflags"
 
-	sched_yield='yield'
+	# -lpthread overrides some lib C functions, so put it before c.
         set `echo X "$libswanted "| sed -e "s/ c / pthread c /"`
         shift
         libswanted="$*"
 
+	# sched_yield is available in the -lrt library.  However,
+	# we can also pick up the equivalent yield() function in the
+	# normal C library.  To avoid pulling in unnecessary
+	# libraries, we'll normally avoid sched_yield()/-lrt and
+	# just use yield().  However, we'll honor a command-line
+	# override : "-Dsched_yield=sched_yield".
+	# If we end up using sched_yield, we're going to need -lrt.
+	sched_yield=${sched_yield:-yield}
+	if test "$sched_yield" = "sched_yield"; then
+	    set `echo X "$libswanted "| sed -e "s/ pthread / rt pthread /"`
+	    shift
+	    libswanted="$*"
+	fi
+
         # On Solaris 2.6 x86 there is a bug with sigsetjmp() and siglongjmp()
         # when linked with the threads library, such that whatever positive
         # value you pass to siglongjmp(), sigsetjmp() returns 1.