Add foundation task queue tests

src/foundation/task_queue.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "foundation/result.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+
+namespace pp::foundation {
+
+constexpr std::size_t max_task_queue_entries = 65536;
+
+using TaskCallback = void (*)(void* user_data) noexcept;
+
+struct TaskItem {
+    TaskCallback callback = nullptr;
+    void* user_data = nullptr;
+    std::uint64_t id = 0;
+};
+
+class TaskQueue {
+public:
+    explicit TaskQueue(std::size_t max_entries = max_task_queue_entries) noexcept;
+
+    [[nodiscard]] std::size_t size() const noexcept;
+    [[nodiscard]] bool empty() const noexcept;
+    [[nodiscard]] std::size_t max_entries() const noexcept;
+
+    [[nodiscard]] Status push(TaskItem task);
+    [[nodiscard]] Result<TaskItem> pop() noexcept;
+    [[nodiscard]] Status run_next() noexcept;
+    [[nodiscard]] std::size_t run_all() noexcept;
+    void clear() noexcept;
+
+private:
+    std::size_t max_entries_ = max_task_queue_entries;
+    std::deque<TaskItem> tasks_;
+};
+
+}