tree 07349bd9721f20f29b99f8a75b6cac14283958f6
parent e5c4d1881b85b82789b7013233a944cf1a46370f
author Andrew Grieve <agrieve@google.com> 1749046440 -0400
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1749114332 -0700

Run Target::OnResolve() on background threads

OnResolve() is often trivial, but it can also not be, as there are a lot
of possible checks that it can do.

"gn --tracelog gen" now shows all threads being always busy.

Hyperfine Benchmark from Chromium:
Before:
  Time (mean ± σ):      7.349 s ±  0.251 s    [User: 66.903 s, System: 50.486 s]
  Range (min … max):    6.974 s …  7.655 s    10 runs

After:
  Time (mean ± σ):      6.563 s ±  0.313 s    [User: 67.873 s, System: 53.023 s]
  Range (min … max):    6.186 s …  7.281 s    10 runs
Bug: chromium:398002893
Change-Id: I30bd9b7541a961b1d0cef80c229b0a3f24752d3e
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/19020
Reviewed-by: David Turner <digit@google.com>
Commit-Queue: David Turner <digit@google.com>
Reviewed-by: Takuto Ikuta <tikuta@google.com>