[libcxx-commits] [libcxx] hxie/semaphore debug2 (PR #180357)
via libcxx-commits
libcxx-commits at lists.llvm.org
Sat Feb 7 11:45:39 PST 2026
https://github.com/huixie90 updated https://github.com/llvm/llvm-project/pull/180357
>From 79cc6e2cc0b253b0a34a3b5ad302341fa943170b Mon Sep 17 00:00:00 2001
From: Hui Xie <hui.xie1990 at gmail.com>
Date: Sat, 7 Feb 2026 16:19:16 +0000
Subject: [PATCH 1/6] [libc++] debug semaaphore
---
.../thread.semaphore/timed.debug.pass.cpp | 84 +++++++++++++++++++
1 file changed, 84 insertions(+)
create mode 100644 libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
diff --git a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
new file mode 100644
index 0000000000000..d7833194927e4
--- /dev/null
+++ b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
@@ -0,0 +1,84 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: no-threads
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <semaphore>
+
+#include <semaphore>
+#include <thread>
+#include <chrono>
+#include <cassert>
+#include <iostream>
+#include <iomanip>
+
+
+#include "make_test_thread.h"
+#include "test_macros.h"
+
+int main(int, char**)
+{
+ auto const start = std::chrono::steady_clock::now();
+ auto log = [start] ()-> auto& {
+ using namespace std::chrono;
+
+ auto elapsed = steady_clock::now() - start;
+
+ auto hours = duration_cast<std::chrono::hours>(elapsed);
+ elapsed -= hours;
+
+ auto minutes = duration_cast<std::chrono::minutes>(elapsed);
+ elapsed -= minutes;
+
+ auto seconds = duration_cast<std::chrono::seconds>(elapsed);
+ elapsed -= seconds;
+
+ auto milliseconds = duration_cast<std::chrono::milliseconds>(elapsed);
+
+ std::cerr << "["
+ << std::setw(2) << std::setfill('0') << hours.count() << ":"
+ << std::setw(2) << std::setfill('0') << minutes.count() << ":"
+ << std::setw(2) << std::setfill('0') << seconds.count() << "."
+ << std::setw(3) << std::setfill('0') << milliseconds.count()
+ << "] ";
+
+ return std::cerr;
+ };
+
+ std::counting_semaphore<> s(0);
+
+ log() << "try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
+ assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
+ log() << "done: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
+
+ log() << "try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
+ assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
+ log() << "done: try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
+
+ std::thread t = support::make_test_thread([&](){
+ std::this_thread::sleep_for(std::chrono::milliseconds(250));
+ s.release();
+ std::this_thread::sleep_for(std::chrono::milliseconds(250));
+ s.release();
+ });
+
+ log() << "try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
+ assert(s.try_acquire_until(start + std::chrono::seconds(2)));
+ log() << "done: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
+
+ log() << "try_acquire_for: " << std::chrono::seconds(2) << "\n";
+ assert(s.try_acquire_for(std::chrono::seconds(2)));
+ log() << "done: try_acquire_for: " << std::chrono::seconds(2) << "\n";
+ t.join();
+
+ auto const end = std::chrono::steady_clock::now();
+ assert(end - start < std::chrono::seconds(10));
+
+ return 1;
+}
>From 15caf8d017581b2ac398c6e89c3b9bd9cb81180d Mon Sep 17 00:00:00 2001
From: Hui Xie <hui.xie1990 at gmail.com>
Date: Sat, 7 Feb 2026 16:23:48 +0000
Subject: [PATCH 2/6] code to debug
---
.../thread.semaphore/timed.debug.pass.cpp | 34 ++++++++++++-------
1 file changed, 21 insertions(+), 13 deletions(-)
diff --git a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
index d7833194927e4..904da25a49940 100644
--- a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
@@ -22,13 +22,11 @@
#include "make_test_thread.h"
#include "test_macros.h"
-int main(int, char**)
-{
- auto const start = std::chrono::steady_clock::now();
- auto log = [start] ()-> auto& {
+void test(auto log_start){
+ auto log = [log_start] ()-> auto& {
using namespace std::chrono;
- auto elapsed = steady_clock::now() - start;
+ auto elapsed = steady_clock::now() - log_start;
auto hours = duration_cast<std::chrono::hours>(elapsed);
elapsed -= hours;
@@ -51,15 +49,16 @@ int main(int, char**)
return std::cerr;
};
+ auto const start = std::chrono::steady_clock::now();
std::counting_semaphore<> s(0);
- log() << "try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
+ log() << "start: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
- log() << "done: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
+ log() << "done: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
- log() << "try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
+ log() << "start: try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
- log() << "done: try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
+ log() << "done: try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
std::thread t = support::make_test_thread([&](){
std::this_thread::sleep_for(std::chrono::milliseconds(250));
@@ -68,17 +67,26 @@ int main(int, char**)
s.release();
});
- log() << "try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
+ log() << "start: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
assert(s.try_acquire_until(start + std::chrono::seconds(2)));
- log() << "done: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
+ log() << "done: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
- log() << "try_acquire_for: " << std::chrono::seconds(2) << "\n";
+ log() << "start: try_acquire_for: " << std::chrono::seconds(2) << "\n";
assert(s.try_acquire_for(std::chrono::seconds(2)));
- log() << "done: try_acquire_for: " << std::chrono::seconds(2) << "\n";
+ log() << "done: try_acquire_for: " << std::chrono::seconds(2) << "\n";
t.join();
auto const end = std::chrono::steady_clock::now();
assert(end - start < std::chrono::seconds(10));
+}
+
+int main(int, char**)
+{
+ auto const log_start = std::chrono::steady_clock::now();
+ for (auto i = 0; i < 10; ++i) {
+ std::cerr << "=== Iteration " << i << " ===\n";
+ test(log_start);
+ }
return 1;
}
>From 09616457c9c0868806e5a3735ca9706f963e6066 Mon Sep 17 00:00:00 2001
From: Hui Xie <hui.xie1990 at gmail.com>
Date: Sat, 7 Feb 2026 16:44:11 +0000
Subject: [PATCH 3/6] stage3
---
libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
index 904da25a49940..d032145f9824d 100644
--- a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
@@ -88,5 +88,10 @@ int main(int, char**)
test(log_start);
}
+#if defined(_WIN32)
return 1;
+#else
+ return 0;
+#endif
+
}
>From 888d7f8ed7904aafb4af917131e9d8182cb309b9 Mon Sep 17 00:00:00 2001
From: Hui Xie <hui.xie1990 at gmail.com>
Date: Sat, 7 Feb 2026 17:11:07 +0000
Subject: [PATCH 4/6] debug more
---
libcxx/src/atomic.cpp | 39 ++++++++++---------
.../thread/thread.semaphore/timed.pass.cpp | 5 +--
2 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/libcxx/src/atomic.cpp b/libcxx/src/atomic.cpp
index 637c971ed8896..f16c9bf1f97c9 100644
--- a/libcxx/src/atomic.cpp
+++ b/libcxx/src/atomic.cpp
@@ -14,6 +14,7 @@
#include <cstring>
#include <functional>
#include <new>
+#include <optional>
#include <thread>
#include <type_traits>
@@ -64,17 +65,17 @@ _LIBCPP_BEGIN_NAMESPACE_STD
#ifdef __linux__
template <std::size_t _Size>
-static void __platform_wait_on_address(void const* __ptr, void const* __val, uint64_t __timeout_ns) {
+static void __platform_wait_on_address(void const* __ptr, void const* __val, optional<uint64_t> __timeout_ns) {
static_assert(_Size == 4, "Can only wait on 4 bytes value");
char buffer[_Size];
std::memcpy(&buffer, const_cast<const void*>(__val), _Size);
static constexpr timespec __default_timeout = {2, 0};
timespec __timeout;
- if (__timeout_ns == 0) {
+ if (!__timeout_ns.has_value()) {
__timeout = __default_timeout;
} else {
- __timeout.tv_sec = __timeout_ns / 1'000'000'000;
- __timeout.tv_nsec = __timeout_ns % 1'000'000'000;
+ __timeout.tv_sec = *__timeout_ns / 1'000'000'000;
+ __timeout.tv_nsec = *__timeout_ns % 1'000'000'000;
}
_LIBCPP_FUTEX(__ptr, FUTEX_WAIT_PRIVATE, *reinterpret_cast<__cxx_contention_t const*>(&buffer), &__timeout, 0, 0);
}
@@ -97,11 +98,11 @@ extern "C" int __ulock_wake(uint32_t operation, void* addr, uint64_t wake_value)
# define ULF_WAKE_ALL 0x00000100
template <std::size_t _Size>
-static void __platform_wait_on_address(void const* __ptr, void const* __val, uint64_t __timeout_ns) {
+static void __platform_wait_on_address(void const* __ptr, void const* __val, optional<uint64_t> __timeout_ns) {
static_assert(_Size == 8 || _Size == 4, "Can only wait on 8 bytes or 4 bytes value");
char buffer[_Size];
std::memcpy(&buffer, const_cast<const void*>(__val), _Size);
- auto __timeout_us = __timeout_ns == 0 ? 0 : static_cast<uint32_t>(__timeout_ns / 1000);
+ auto __timeout_us = !__timeout_ns.has_value() ? uint32_t(0) : std::max(static_cast<uint32_t>(*__timeout_ns / 1000), uint32_t(1));
if constexpr (_Size == 4)
__ulock_wait(
UL_COMPARE_AND_WAIT, const_cast<void*>(__ptr), *reinterpret_cast<uint32_t const*>(&buffer), __timeout_us);
@@ -128,16 +129,16 @@ static void __platform_wake_by_address(void const* __ptr, bool __notify_one) {
*/
template <std::size_t _Size>
-static void __platform_wait_on_address(void const* __ptr, void const* __val, uint64_t __timeout_ns) {
+static void __platform_wait_on_address(void const* __ptr, void const* __val, optional<uint64_t> __timeout_ns) {
static_assert(_Size == 8, "Can only wait on 8 bytes value");
char buffer[_Size];
std::memcpy(&buffer, const_cast<const void*>(__val), _Size);
- if (__timeout_ns == 0) {
+ if (!__timeout_ns.has_value()) {
_umtx_op(const_cast<void*>(__ptr), UMTX_OP_WAIT, *reinterpret_cast<__cxx_contention_t*>(&buffer), nullptr, nullptr);
} else {
_umtx_time ut;
- ut._timeout.tv_sec = __timeout_ns / 1'000'000'000;
- ut._timeout.tv_nsec = __timeout_ns % 1'000'000'000;
+ ut._timeout.tv_sec = *__timeout_ns / 1'000'000'000;
+ ut._timeout.tv_nsec = *__timeout_ns % 1'000'000'000;
ut._flags = 0; // Relative time (not absolute)
ut._clockid = CLOCK_MONOTONIC; // Use monotonic clock
@@ -182,7 +183,7 @@ static void* win32_get_synch_api_function(const char* function_name) {
}
template <std::size_t _Size>
-static void __platform_wait_on_address(void const* __ptr, void const* __val, uint64_t __timeout_ns) {
+static void __platform_wait_on_address(void const* __ptr, void const* __val, optional<uint64_t> __timeout_ns) {
static_assert(_Size == 8, "Can only wait on 8 bytes value");
// WaitOnAddress was added in Windows 8 (build 9200)
static auto wait_on_address =
@@ -191,12 +192,12 @@ static void __platform_wait_on_address(void const* __ptr, void const* __val, uin
wait_on_address(const_cast<void*>(__ptr),
const_cast<void*>(__val),
_Size,
- __timeout_ns == 0 ? INFINITE : static_cast<DWORD>(__timeout_ns / 1'000'000));
+ !__timeout_ns.has_value() ? INFINITE : static_cast<DWORD>(*__timeout_ns / 1'000'000));
} else {
__libcpp_thread_poll_with_backoff(
[=]() -> bool { return std::memcmp(const_cast<const void*>(__ptr), __val, _Size) != 0; },
__libcpp_timed_backoff_policy(),
- std::chrono::nanoseconds(__timeout_ns));
+ std::chrono::nanoseconds(__timeout_ns.value_or(0)));
}
}
@@ -231,7 +232,7 @@ static void __platform_wake_by_address(void const* __ptr, bool __notify_one) {
// Baseline is just a timed backoff
template <std::size_t _Size>
-static void __platform_wait_on_address(void const* __ptr, void const* __val, uint64_t __timeout_ns) {
+static void __platform_wait_on_address(void const* __ptr, void const* __val, optional<uint64_t> __timeout_ns) {
__libcpp_thread_poll_with_backoff(
[=]() -> bool { return std::memcmp(const_cast<const void*>(__ptr), __val, _Size) != 0; },
__libcpp_timed_backoff_policy(),
@@ -262,7 +263,7 @@ template <std::size_t _Size>
static void __contention_wait(__cxx_atomic_contention_t* __waiter_count,
void const* __address_to_wait,
void const* __old_value,
- uint64_t __timeout_ns) {
+ optional<uint64_t> __timeout_ns) {
__cxx_atomic_fetch_add(__waiter_count, __cxx_contention_t(1), memory_order_relaxed);
// https://llvm.org/PR109290
// There are no platform guarantees of a memory barrier in the platform wait implementation
@@ -331,7 +332,7 @@ _LIBCPP_EXPORTED_FROM_ABI void
__atomic_wait_global_table(void const* __location, __cxx_contention_t __old_value) noexcept {
auto const __entry = __get_global_contention_state(__location);
__contention_wait<sizeof(__cxx_atomic_contention_t)>(
- &__entry->__waiter_count, &__entry->__platform_state, &__old_value, 0);
+ &__entry->__waiter_count, &__entry->__platform_state, &__old_value, nullopt);
}
_LIBCPP_EXPORTED_FROM_ABI void __atomic_wait_global_table_with_timeout(
@@ -353,7 +354,7 @@ _LIBCPP_EXPORTED_FROM_ABI void __atomic_notify_all_global_table(void const* __lo
template <std::size_t _Size>
_LIBCPP_EXPORTED_FROM_ABI void __atomic_wait_native(void const* __address, void const* __old_value) noexcept {
- __contention_wait<_Size>(__get_native_waiter_count(__address), __address, __old_value, 0);
+ __contention_wait<_Size>(__get_native_waiter_count(__address), __address, __old_value, nullopt);
}
template <std::size_t _Size>
@@ -428,7 +429,7 @@ _LIBCPP_EXPORTED_FROM_ABI void
__libcpp_atomic_wait(void const volatile* __location, __cxx_contention_t __old_value) noexcept {
auto const __entry = __get_global_contention_state(const_cast<void const*>(__location));
__contention_wait<sizeof(__cxx_atomic_contention_t)>(
- &__entry->__waiter_count, &__entry->__platform_state, &__old_value, 0);
+ &__entry->__waiter_count, &__entry->__platform_state, &__old_value, nullopt);
}
_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(__cxx_atomic_contention_t const volatile* __location) noexcept {
@@ -447,7 +448,7 @@ _LIBCPP_EXPORTED_FROM_ABI void
__libcpp_atomic_wait(__cxx_atomic_contention_t const volatile* __location, __cxx_contention_t __old_value) noexcept {
auto __location_cast = const_cast<const void*>(static_cast<const volatile void*>(__location));
__contention_wait<sizeof(__cxx_atomic_contention_t)>(
- __get_native_waiter_count(__location_cast), __location_cast, &__old_value, 0);
+ __get_native_waiter_count(__location_cast), __location_cast, &__old_value, nullopt);
}
// this function is even unused in the old ABI
diff --git a/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp b/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
index d0aa1f46072b9..b570abf6940d5 100644
--- a/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/timed.pass.cpp
@@ -19,8 +19,7 @@
#include "make_test_thread.h"
#include "test_macros.h"
-int main(int, char**)
-{
+int main(int, char**) {
auto const start = std::chrono::steady_clock::now();
std::counting_semaphore<> s(0);
@@ -28,7 +27,7 @@ int main(int, char**)
assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
- std::thread t = support::make_test_thread([&](){
+ std::thread t = support::make_test_thread([&]() {
std::this_thread::sleep_for(std::chrono::milliseconds(250));
s.release();
std::this_thread::sleep_for(std::chrono::milliseconds(250));
>From 484dc598ecdf4451cf7109519cf8b6f7c27f4a91 Mon Sep 17 00:00:00 2001
From: Hui Xie <hui.xie1990 at gmail.com>
Date: Sat, 7 Feb 2026 19:44:00 +0000
Subject: [PATCH 5/6] return 0
---
.../thread.semaphore/timed.debug.pass.cpp | 32 +++++++------------
1 file changed, 11 insertions(+), 21 deletions(-)
diff --git a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
index d032145f9824d..4094645c42155 100644
--- a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
@@ -18,12 +18,11 @@
#include <iostream>
#include <iomanip>
-
#include "make_test_thread.h"
#include "test_macros.h"
-void test(auto log_start){
- auto log = [log_start] ()-> auto& {
+void test(auto log_start) {
+ auto log = [log_start]() -> auto& {
using namespace std::chrono;
auto elapsed = steady_clock::now() - log_start;
@@ -39,12 +38,9 @@ void test(auto log_start){
auto milliseconds = duration_cast<std::chrono::milliseconds>(elapsed);
- std::cerr << "["
- << std::setw(2) << std::setfill('0') << hours.count() << ":"
- << std::setw(2) << std::setfill('0') << minutes.count() << ":"
- << std::setw(2) << std::setfill('0') << seconds.count() << "."
- << std::setw(3) << std::setfill('0') << milliseconds.count()
- << "] ";
+ std::cerr << "[" << std::setw(2) << std::setfill('0') << hours.count() << ":" << std::setw(2) << std::setfill('0')
+ << minutes.count() << ":" << std::setw(2) << std::setfill('0') << seconds.count() << "." << std::setw(3)
+ << std::setfill('0') << milliseconds.count() << "] ";
return std::cerr;
};
@@ -52,24 +48,24 @@ void test(auto log_start){
auto const start = std::chrono::steady_clock::now();
std::counting_semaphore<> s(0);
- log() << "start: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
+ log() << "start: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
assert(!s.try_acquire_until(start + std::chrono::milliseconds(250)));
- log() << "done: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
+ log() << "done: try_acquire_until: start + " << std::chrono::milliseconds(250) << "\n";
log() << "start: try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
assert(!s.try_acquire_for(std::chrono::milliseconds(250)));
log() << "done: try_acquire_for: " << std::chrono::milliseconds(250) << "\n";
- std::thread t = support::make_test_thread([&](){
+ std::thread t = support::make_test_thread([&]() {
std::this_thread::sleep_for(std::chrono::milliseconds(250));
s.release();
std::this_thread::sleep_for(std::chrono::milliseconds(250));
s.release();
});
- log() << "start: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
+ log() << "start: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
assert(s.try_acquire_until(start + std::chrono::seconds(2)));
- log() << "done: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
+ log() << "done: try_acquire_until: start + " << std::chrono::seconds(2) << "\n";
log() << "start: try_acquire_for: " << std::chrono::seconds(2) << "\n";
assert(s.try_acquire_for(std::chrono::seconds(2)));
@@ -80,18 +76,12 @@ void test(auto log_start){
assert(end - start < std::chrono::seconds(10));
}
-int main(int, char**)
-{
+int main(int, char**) {
auto const log_start = std::chrono::steady_clock::now();
for (auto i = 0; i < 10; ++i) {
std::cerr << "=== Iteration " << i << " ===\n";
test(log_start);
}
-#if defined(_WIN32)
- return 1;
-#else
return 0;
-#endif
-
}
>From b19aa354842039668bf9141e0e15f462fcdd4fd2 Mon Sep 17 00:00:00 2001
From: Hui Xie <hui.xie1990 at gmail.com>
Date: Sat, 7 Feb 2026 19:45:26 +0000
Subject: [PATCH 6/6] increase
---
libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
index 4094645c42155..1a6d790b051a0 100644
--- a/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
+++ b/libcxx/test/std/thread/thread.semaphore/timed.debug.pass.cpp
@@ -78,7 +78,7 @@ void test(auto log_start) {
int main(int, char**) {
auto const log_start = std::chrono::steady_clock::now();
- for (auto i = 0; i < 10; ++i) {
+ for (auto i = 0; i < 30; ++i) {
std::cerr << "=== Iteration " << i << " ===\n";
test(log_start);
}
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