| commit | 18a0e23fe9fa1935f6d278e4f6872ba03e84d82f | [log] [tgz] |
|---|---|---|
| author | jmmv <jmmv@google.com> | Thu Feb 21 07:34:02 2019 -0800 |
| committer | Copybara-Service <copybara-worker@google.com> | Thu Feb 21 07:35:44 2019 -0800 |
| tree | ef205286802df2674a4e78710c0fdedb04036f2c | |
| parent | 25d202fc1545f4aaba821df75a8bf3fb57284da1 [diff] |
Use posix_spawn to start the Bazel server. Introduce a new "daemonize" helper tool that takes the heavy-lifting of starting the Bazel server process as a daemon. This tool is pure C and does not have any big dependencies like gRPC so we can ensure it's thread-free. As a result, the code in this tool doesn't have to take a lot of care when running fork(), which results in easier to read code overall. Then, change the Bazel client to simply use posix_spawn to invoke this helper tool, which in turn runs the Bazel server as a daemon. The code in the Bazel client becomes simpler as well as we don't have to worry about the implications of using fork() from a threaded process. The switch to posix_spawn is necessary to address https://github.com/bazelbuild/bazel/issues/7446 because the only way to customize the QoS of a process in macOS is by using this API. Such a change will come separately. This change is intended to be a no-op. However, this fixes a bug introduced in unknown commit by which we violated the requirement of not doing any memory management from a child process started with fork(). (I don't think this bug ever manifested itself, but it was there -- which is funny because this piece of code went to great extents to not do the wrong thing... and a one-line change let hell break loose.) RELNOTES: None. PiperOrigin-RevId: 234991943
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