* Makefile.in (LLINKER): New variable.

	(mostlyclean): Remove link mutex.
	* configure.ac: Handle --enable-link-mutex.
	* lock-and-run.sh: New script.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@198977 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 29 insertions, 0 deletions

diff --git a/gcc/lock-and-run.sh b/gcc/lock-and-run.sh
new file mode 100644
index 00000000000..abefa068a55
--- /dev/null
+++ b/gcc/lock-and-run.sh
@@ -0,0 +1,29 @@
+#! /bin/sh
+# Shell-based mutex using mkdir.
+
+lockdir=$1 prog=$2; shift 2 || exit 1
+count=0
+# Remember when we started trying to acquire the lock.
+touch lock-stamp.$$
+trap 'rm -r "$lockdir" lock-stamp.$$' 0
+until mkdir "$lockdir" 2>/dev/null; do
+    # Say something periodically so the user knows what's up.
+    if [ `expr $count % 30` = 0 ]; then
+	# Reset if the lock has been renewed.
+	if [ -n "`find \"$lockdir\" -newer lock-stamp.$$`" ]; then
+	    touch lock-stamp.$$
+	    count=1
+	# Steal the lock after 5 minutes.
+	elif [ $count = 300 ]; then
+	    echo removing stale $lockdir >&2
+	    rm -r "$lockdir"
+	else
+	    echo waiting to acquire $lockdir >&2
+	fi
+    fi
+    sleep 1
+    count=`expr $count + 1`
+done
+echo $prog "$@"
+$prog "$@"
+# The trap runs on exit.