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Spawn a dynamic thread when queued jobs outnumber idle threads

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ThreadPool::enqueue only spawned a dynamic thread when no thread was
idle. Threads already notified for an earlier job still counted as
idle until they took it, so a burst of connections could leave jobs
queued with no thread while the pool was below max_threads. With
keep-alive, such a connection waited until another connection closed.

Fix #2633
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yhirose committed 2026-10-17 23:55:12 -04:00
1 parent 062666f3a1
commit e97165b5dc
2 files changed
+35 -2
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httplib.h
+2 -2
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@@ -12423,8 +12423,8 @@ inline bool ThreadPool::enqueue(std::function<void()> fn) {
}
jobs_.push_back(std::move(fn));
// Spawn a dynamic thread if no idle threads and under max
if (idle_thread_count_ == 0 &&
// Spawn a dynamic thread if jobs outnumber idle threads and under max
if (jobs_.size() > idle_thread_count_ &&
threads_.size() + dynamic_threads_.size() < max_thread_count_) {
cleanup_finished_threads();
dynamic_threads_.emplace_back(std::thread([this]() { worker(true); }));