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| author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
|---|---|---|
| committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
| commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
| tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/lock-and-run.sh | |
| parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
| download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip | |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/lock-and-run.sh')
| -rw-r--r-- | gcc-4.9/gcc/lock-and-run.sh | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/lock-and-run.sh b/gcc-4.9/gcc/lock-and-run.sh new file mode 100644 index 000000000..3a6a84c25 --- /dev/null +++ b/gcc-4.9/gcc/lock-and-run.sh @@ -0,0 +1,34 @@ +#! /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. |