chore(3p/nix): unvendor tvix 0.1 r/4098

Nothing is using this now, and we'll likely never pick this up again,
but we learned a lot in the process.

Every now and then this breaks in some bizarre way on channel bumps
and it's just a waste of time to maintain that.

Change-Id: Idcf2f5acd4ca7070ce18d7149cbfc0d967dc0a44
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5632
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Autosubmit: tazjin <tazjin@tvl.su>

1 files changed, 0 insertions, 84 deletions

diff --git a/third_party/nix/src/libutil/sync.hh b/third_party/nix/src/libutil/sync.hh
deleted file mode 100644
index ef640d5b56ef..000000000000
--- a/third_party/nix/src/libutil/sync.hh
+++ /dev/null
@@ -1,84 +0,0 @@
-#pragma once
-
-#include <cassert>
-#include <condition_variable>
-#include <cstdlib>
-#include <mutex>
-
-namespace nix {
-
-/* This template class ensures synchronized access to a value of type
-   T. It is used as follows:
-
-     struct Data { int x; ... };
-
-     Sync<Data> data;
-
-     {
-       auto data_(data.lock());
-       data_->x = 123;
-     }
-
-   Here, "data" is automatically unlocked when "data_" goes out of
-   scope.
-*/
-
-template <class T, class M = std::mutex>
-class Sync {
- private:
-  M mutex;
-  T data;
-
- public:
-  Sync() {}
-  explicit Sync(const T& data) : data(data) {}
-  explicit Sync(T&& data) noexcept : data(std::move(data)) {}
-
-  class Lock {
-   private:
-    Sync* s;
-    std::unique_lock<M> lk;
-    friend Sync;
-    explicit Lock(Sync* s) : s(s), lk(s->mutex) {}
-
-   public:
-    Lock(Lock&& l) : s(l.s) { abort(); }
-    Lock(const Lock& l) = delete;
-    ~Lock() {}
-    T* operator->() { return &s->data; }
-    T& operator*() { return s->data; }
-
-    void wait(std::condition_variable& cv) {
-      assert(s);
-      cv.wait(lk);
-    }
-
-    template <class Rep, class Period>
-    std::cv_status wait_for(
-        std::condition_variable& cv,
-        const std::chrono::duration<Rep, Period>& duration) {
-      assert(s);
-      return cv.wait_for(lk, duration);
-    }
-
-    template <class Rep, class Period, class Predicate>
-    bool wait_for(std::condition_variable& cv,
-                  const std::chrono::duration<Rep, Period>& duration,
-                  Predicate pred) {
-      assert(s);
-      return cv.wait_for(lk, duration, pred);
-    }
-
-    template <class Clock, class Duration>
-    std::cv_status wait_until(
-        std::condition_variable& cv,
-        const std::chrono::time_point<Clock, Duration>& duration) {
-      assert(s);
-      return cv.wait_until(lk, duration);
-    }
-  };
-
-  Lock lock() { return Lock(this); }
-};
-
-}  // namespace nix