From e44085eb742cb14dff22de054ef19fe725a4e2c2 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Fri, 17 Jul 2026 18:07:43 +0900
Subject: refactor(loop): drive wait() promises concurrently via
 FuturesUnordered

Loop::wait already had the target signature and a TODO(phase-c-promise)
marker noting it drove promises serially; swap the for-loop for
FuturesUnordered so all promises are polled together instead of one at
a time, keeping the "remember only the first error" semantics.

This adds the first real use of the futures dependency (already present
in Cargo.toml/Cargo.lock from earlier prep work, now finally consumed),
so those lockfile/manifest changes land in this commit.

Real overlap still doesn't happen yet: each promise (HttpDownloader::add/
add_copy etc.) resolves through a blocking bridge (curl_runtime()/
sync_executor::block_on) that fully occupies the thread until it
settles, so this is groundwork for once a single top-level Runtime
replaces those bridges. Updated the TODO(phase-c-promise) comment to
reflect that.
---
 Cargo.lock | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'Cargo.lock')

diff --git a/Cargo.lock b/Cargo.lock
index 538340cd..946f2685 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -562,6 +562,21 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42703706b716c37f96a77aea830392ad231f44c9e9a67872fa5548707e11b11c"
 
+[[package]]
+name = "futures"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b147ee9d1f6d097cef9ce628cd2ee62288d963e16fb287bd9286455b241382d"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
 [[package]]
 name = "futures-channel"
 version = "0.3.32"
@@ -595,6 +610,17 @@ version = "0.3.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cecba35d7ad927e23624b22ad55235f2239cfa44fd10428eecbeba6d6a717718"
 
+[[package]]
+name = "futures-macro"
+version = "0.3.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e835b70203e41293343137df5c0664546da5745f82ec9b84d40be8336958447b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "futures-sink"
 version = "0.3.32"
@@ -613,8 +639,10 @@ version = "0.3.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "389ca41296e6190b48053de0321d02a77f32f8a5d2461dd38762c0593805c6d6"
 dependencies = [
+ "futures-channel",
  "futures-core",
  "futures-io",
+ "futures-macro",
  "futures-sink",
  "futures-task",
  "memchr",
@@ -1998,6 +2026,7 @@ dependencies = [
  "async-trait",
  "base64",
  "chrono",
+ "futures",
  "indexmap",
  "jsonschema",
  "md5",
-- 
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