[thirdparty/gcc.git] / gcc / lock-and-run.sh

#! /bin/sh
# Shell-based mutex using mkdir.

lockdir="$1" prog="$2"; shift 2 || exit 1

# Remember when we started trying to acquire the lock.
count=0
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.
Commit	Line	Data
be5f9e46	1	#! /bin/sh
	2	# Shell-based mutex using mkdir.
	3
a9f1d053	4	lockdir="$1" prog="$2"; shift 2 \|\| exit 1
a9f1d053	5
be5f9e46	6	# Remember when we started trying to acquire the lock.
a9f1d053	7	count=0
be5f9e46	8	touch lock-stamp.$$
a9f1d053	9
be5f9e46	10	trap 'rm -r "$lockdir" lock-stamp.$$' 0
a9f1d053	11
be5f9e46	12	until mkdir "$lockdir" 2>/dev/null; do
	13	# Say something periodically so the user knows what's up.
	14	if [ `expr $count % 30` = 0 ]; then
	15	# Reset if the lock has been renewed.
	16	if [ -n "`find \"$lockdir\" -newer lock-stamp.$$`" ]; then
	17	touch lock-stamp.$$
	18	count=1
	19	# Steal the lock after 5 minutes.
	20	elif [ $count = 300 ]; then
	21	echo removing stale $lockdir >&2
	22	rm -r "$lockdir"
	23	else
	24	echo waiting to acquire $lockdir >&2
	25	fi
	26	fi
	27	sleep 1
	28	count=`expr $count + 1`
	29	done
a9f1d053	30
be5f9e46	31	echo $prog "$@"
be5f9e46	32	$prog "$@"
a9f1d053	33
be5f9e46	34	# The trap runs on exit.