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[cache] Fix dune freezing on MacOS with cache enabled #3249

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merged 2 commits into from
Mar 9, 2020

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artempyanykh
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Summary:
On MacOS shutdown on a socket raises ENOTCONN even when only one
side of the duplex communication is closed. This doesn't make much
sense to me (also, man pages are rather fuzzy around this, and on
Linux it behaves differently), but it is what it is.

Since cache/client calls Unix.shutdown client.fd Unix.SHUTDOWN_SEND
during teardown, cache_daemon.ml gets an exception on its shutdown,
which it swallows and therefore never closes client.fd.

Test plan:

  1. Cache trimming tests work (and now enabled for all platforms),
  2. Freezing described in dune build freezes with cache enabled #3233 is now gone.
  3. Still works fine on Linux.

Fixes #3233 #2973

Signed-off-by: Artem Pianykh artem.pyanykh@gmail.com

Summary:
On MacOS shutdown on a socket raises `ENOTCONN` even when only one
side of the duplex communication is closed. This doesn't make much
sense to me (also, man pages are rather fuzzy around this, and on
Linux it behaves differently), but it is what it is.

Since cache/client calls `Unix.shutdown client.fd Unix.SHUTDOWN_SEND`
during teardown, `cache_daemon.ml` gets an exception on its shutdown,
which it swallows and therefore never closes `client.fd`.

Test plan:
1. Cache trimming tests work (and now enabled for all platforms),
2. Freezing described in ocaml#3233 is now gone.
3. Still works fine on Linux.

Fixes ocaml#3233 ocaml#2973

Signed-off-by: Artem Pyanykh <artem.pyanykh@gmail.com>
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@mefyl mefyl left a comment

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LGTM, thanks a bunch !

@mefyl mefyl merged commit 4ae6363 into ocaml:master Mar 9, 2020
rgrinberg added a commit to rgrinberg/opam-repository that referenced this pull request Apr 10, 2020
…lugin, dune-private-libs and dune-glob (2.5.0)

CHANGES:

- Add a `--release` option meaning the same as `-p` but without the
  package filtering. This is useful for custom `dune` invocation in opam
  files where we don't want `-p` (ocaml/dune#3260, @diml)

- Fix a bug introduced in 2.4.0 causing `.bc` programs to be built
  with `-custom` by default (ocaml/dune#3269, fixes ocaml/dune#3262, @diml)

- Allow contexts to be defined with local switches in workspace files (ocaml/dune#3265,
  fix ocaml/dune#3264, @rgrinberg)

- Delay expansion errors until the rule is used to build something (ocaml/dune#3261, fix
  ocaml/dune#3252, @rgrinberg, @diml)

- [coq] Support for theory dependencies and compositional builds using
  new field `(theories ...)` (ocaml/dune#2053, @ejgallego, @rgrinberg)

- From now on, each version of a syntax extension must be explicitely tied to a
  minimum version of the dune language. Inconsistent versions in a
  `dune-project` will trigger a warning for version <=2.4 and an error for
  versions >2.4 of the dune language. (ocaml/dune#3270, fixes ocaml/dune#2957, @voodoos)

- [coq] Bump coq lang version to 0.2. New coq features presented this release
  require this version of the coq lang. (ocaml/dune#3283, @ejgallego)

- Prevent installation of public executables disabled using the `enabled_if` field.
  Installation will now simply skip such executables instead of raising an
  error. (ocaml/dune#3195, @voodoos)

- `dune upgrade` will now try to upgrade projects using versions <2.0 to version
  2.0 of the dune language. (ocaml/dune#3174, @voodoos)

- Add a `top` command to integrate dune with any toplevel, not just
  utop. It is meant to be used with the new `#use_output` directive of
  OCaml 4.11 (ocaml/dune#2952, @mbernat, @diml)

- Allow per-package `version` in generated `opam` files (ocaml/dune#3287, @toots)

- [coq] Introduce the `coq.extraction` stanza. It can be used to extract OCaml
  sources (ocaml/dune#3299, fixes ocaml/dune#2178, @rgrinberg)

- Load ppx rewriters in dune utop and add pps field to toplevel stanza. Ppx
  extensions will now be usable in the toplevel
  (ocaml/dune#3266, fixes ocaml/dune#346, @stephanieyou)

- Add a `(subdir ..)` stanza to allow evaluating stanzas in sub directories.
  (ocaml/dune#3268, @rgrinberg)

- Fix a bug preventing one from running inline tests in multiple modes
  (ocaml/dune#3352, @diml)

- Allow the use of the `%{profile}` variable in the `enabled_if` field of the
  library stanza. (ocaml/dune#3344, @mrmr1993)

- Allow the use of `%{ocaml_version}` variable in `enabled_if` field of the
  library stanza. (ocaml/dune#3339, @voodoos)

- Fix dune build freezing on MacOS when cache is enabled. (ocaml/dune#3249, fixes #ocaml/dune#2973,
  @artempyanykh)
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dune build freezes with cache enabled
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