| commit | b4d3dedb2f09a22614f365a0c156aa4afa88e375 | [log] [tgz] |
|---|---|---|
| author | Rupert Swarbrick <rswarbrick@lowrisc.org> | Mon May 30 14:55:00 2022 +0100 |
| committer | Rupert Swarbrick <rswarbrick@gmail.com> | Tue May 31 22:48:00 2022 +0100 |
| tree | bf7e15b2929b8885c69104439896ecff8931f149 | |
| parent | 1d7ebb7cf9beebc1750df19d22f119415d12cef1 [diff] |
[bazelisk] Use a lock to avoid downloading Bazel lots of times Before this change, running lots of instances of bazelisk.sh at once meant downloading lots of copies of Bazel. Oops! Now, if you run bazelisk.sh on its own on a clean checkout, the first call to up_to_date will fail. We'll then take a lock, check again that we need to download bazelisk (we do!) and then download it, finally releasing the lock. If we run bazelisk.sh in a clean checkout with 100 threads at once, they will will all race to get the first flock. One of them will win the race and follow the steps above. All of the others will sit and wait for that first thread. Once it is done, they will run in order, each checking that bazelisk is up to date (it is!) and then do whatever job they are supposed to be doing. Of course, the usual situation is that we've already got bazelisk installed. In this case, the first call to up_to_date will pass and we won't do any locking at all. Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.
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