Squashed 'external/toxcore/c-toxcore/' changes from c9cdae001..9ed2fa80d

9ed2fa80d fix(toxav): remove extra copy of video frame on encode
de30cf3ad docs: Add new file kinds, that should be useful to all clients.
d5b5e879d fix(DHT): Correct node skipping logic timed out nodes.
30e71fe97 refactor: Generate event dispatch functions and add tox_events_dispatch.
8fdbb0b50 style: Format parameter lists in event handlers.
d00dee12b refactor: Add warning logs when losing chat invites.
b144e8db1 feat: Add a way to look up a file number by ID.
849281ea0 feat: Add a way to fetch groups by chat ID.
a2c177396 refactor: Harden event system and improve type safety.
8f5caa656 refactor: Add MessagePack string support to bin_pack.
34e8d5ad5 chore: Add GitHub CodeQL workflow and local Docker runner.
f7b068010 refactor: Add nullability annotations to event headers.
788abe651 refactor(toxav): Use system allocator for mutexes.
2e4b423eb refactor: Use specific typedefs for public API arrays.
2baf34775 docs(toxav): update idle iteration interval see 679444751876fa3882a717772918ebdc8f083354
2f87ac67b feat: Add Event Loop abstraction (Ev).
f8dfc38d8 test: Fix data race in ToxScenario virtual_clock.
38313921e test(TCP): Add regression test for TCP priority queue integrity.
f94a50d9a refactor(toxav): Replace mutable_mutex with dynamically allocated mutex.
ad054511e refactor: Internalize DHT structs and add debug helpers.
8b467cc96 fix: Prevent potential integer overflow in group chat handshake.
4962bdbb8 test: Improve TCP simulation and add tests
5f0227093 refactor: Allow nullable data in group chat handlers.
e97b18ea9 chore: Improve Windows Docker support.
b14943bbd refactor: Move Logger out of Messenger into Tox.
dd3136250 cleanup: Apply nullability qualifiers to C++ codebase.
1849f70fc refactor: Extract low-level networking code to net and os_network.
8fec75421 refactor: Delete tox_random, align on rng and os_random.
a03ae8051 refactor: Delete tox_memory, align on mem and os_memory.
4c88fed2c refactor: Use `std::` prefixes more consistently in C++ code.
72452f2ae test: Add some more tests for onion and shared key cache.
d5a51b09a cleanup: Use tox_attributes.h in tox_private.h and install it.
b6f5b9fc5 test: Add some benchmarks for various high level things.
8a8d02785 test(support): Introduce threaded Tox runner and simulation barrier
d68d1d095 perf(toxav): optimize audio and video intermediate buffers by keeping them around
REVERT: c9cdae001 fix(toxav): remove extra copy of video frame on encode

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 9ed2fa80d582c714d6bdde6a7648220a92cddff8

toxcore/ev_bench.cc

@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later
+ * Copyright © 2026 The TokTok team.
+ */
+
+#include <benchmark/benchmark.h>
+
+#include <cstdlib>
+#include <vector>
+
+#include "ev_test_util.hh"
+#include "logger.h"
+#include "net.h"
+#include "os_event.h"
+#include "os_memory.h"
+#include "os_network.h"
+
+namespace {
+
+class EvBenchFixture : public benchmark::Fixture {
+public:
+    void SetUp(const ::benchmark::State &state) override
+    {
+        if (os_network() == nullptr) {
+            setup_error = "os_network failed";
+            return;
+        }
+        mem = os_memory();
+        log = logger_new(mem);
+        // We don't want log output during benchmark
+        ev = os_event_new(mem, log);
+    }
+
+    void TearDown(const ::benchmark::State &state) override
+    {
+        for (size_t i = 0; i < sockets_r.size(); ++i) {
+            close_pair(sockets_r[i], sockets_w[i]);
+        }
+        sockets_r.clear();
+        sockets_w.clear();
+        ev_kill(ev);
+        logger_kill(log);
+    }
+
+    const Memory *mem = nullptr;
+    Logger *log = nullptr;
+    Ev *ev = nullptr;
+    std::vector<Socket> sockets_r;
+    std::vector<Socket> sockets_w;
+    int tag = 1;
+    std::string setup_error;
+};
+
+// Specialized SetUp to handle socket creation based on range
+class EvBenchSocketsFixture : public EvBenchFixture {
+public:
+    void SetUp(const ::benchmark::State &state) override
+    {
+        EvBenchFixture::SetUp(state);
+        if (!setup_error.empty()) {
+            return;
+        }
+        const int num_sockets = state.range(0);
+
+        for (int i = 0; i < num_sockets; ++i) {
+            Socket r{}, w{};
+            if (create_pair(&r, &w) != 0) {
+                setup_error = "Failed to create socket pair";
+                return;
+            }
+            sockets_r.push_back(r);
+            sockets_w.push_back(w);
+            if (!ev_add(ev, r, EV_READ, &tag)) {
+                setup_error = "Failed to add socket to event loop";
+                return;
+            }
+        }
+    }
+};
+
+BENCHMARK_DEFINE_F(EvBenchSocketsFixture, EventLoopRun)(benchmark::State &state)
+{
+    if (!setup_error.empty()) {
+        state.SkipWithError(setup_error.c_str());
+        return;
+    }
+    // Sockets are already created in SetUp.
+
+    Ev_Result results[1];
+    char buf = 'x';
+
+    // We trigger the last socket
+    if (write_socket(sockets_w.back(), &buf, 1) != 1) {
+        state.SkipWithError("Failed to write to socket");
+        return;
+    }
+
+    for (auto _ : state) {
+        int32_t n = ev_run(ev, results, 1, 100);
+        if (n != 1) {
+            state.SkipWithError("ev_run did not return event");
+            break;
+        }
+    }
+}
+
+BENCHMARK_REGISTER_F(EvBenchSocketsFixture, EventLoopRun)->Range(8, 1024);
+
+BENCHMARK_DEFINE_F(EvBenchSocketsFixture, EventLoopMultipleActive)(benchmark::State &state)
+{
+    if (!setup_error.empty()) {
+        state.SkipWithError(setup_error.c_str());
+        return;
+    }
+
+    const int num_sockets = state.range(0);
+    const int num_active = state.range(1);
+
+    if (num_active > num_sockets) {
+        state.SkipWithError("Active sockets cannot exceed total sockets");
+        return;
+    }
+
+    char buf = 'x';
+    // Trigger 'num_active' sockets
+    for (int i = 0; i < num_active; ++i) {
+        if (write_socket(sockets_w[i], &buf, 1) != 1) {
+            state.SkipWithError("Failed to write socket");
+            return;
+        }
+    }
+
+    std::vector<Ev_Result> results(num_active);
+
+    for (auto _ : state) {
+        int32_t n = ev_run(ev, results.data(), num_active, 100);
+        if (n != num_active) {
+            state.SkipWithError("ev_run did not return expected number of events");
+            break;
+        }
+    }
+}
+
+// Fix N=1024, vary M
+BENCHMARK_REGISTER_F(EvBenchSocketsFixture, EventLoopMultipleActive)
+    ->Args({1024, 1})
+    ->Args({1024, 10})
+    ->Args({1024, 100})
+    ->Args({1024, 1024});
+
+}  // namespace
+
+BENCHMARK_MAIN();