16708247588

Committed 03 Aug 2025 06:44PM UTC coverage: 88.09%. First build

Build # 16708247588

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Pull #365

github

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web-flow

Commit Message

Merge c76976ebb into 10ca7de0a

Pull Request Pull Request #365: coro::shared_mutex use coro::mutex instead of std::mutex

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84.62

/include/coro/shared_mutex.hpp

#pragma once

#include "coro/concepts/executor.hpp"
#include "coro/mutex.hpp"
#include "coro/task.hpp"

#include <atomic>
#include <coroutine>

namespace coro
{
template<concepts::executor executor_type>
class shared_mutex;

namespace detail
{
template<concepts::executor executor_type>
struct shared_lock_operation
{
    explicit shared_lock_operation(coro::shared_mutex<executor_type>& shared_mutex, const bool exclusive)
        : m_shared_mutex(shared_mutex),
          m_exclusive(exclusive)
    {}
    ~shared_lock_operation() = default;

    shared_lock_operation(const shared_lock_operation&) = delete;
    shared_lock_operation(shared_lock_operation&&) = delete;
    auto operator=(const shared_lock_operation&) -> shared_lock_operation& = delete;
    auto operator=(shared_lock_operation&&) -> shared_lock_operation& = delete;

    auto await_ready() const noexcept -> bool
    {
        // If either mode can be acquired, unlock the internal mutex and resume.

        if (m_exclusive)
        {
            if (m_shared_mutex.try_lock_locked())
            {
                m_shared_mutex.m_mutex.unlock();
                return true;
            }
        }
        else if (m_shared_mutex.try_lock_shared_locked())
        {
            m_shared_mutex.m_mutex.unlock();
            return true;
        }

        return false;
    }

    auto await_suspend(std::coroutine_handle<> awaiting_coroutine) noexcept -> bool
    {
        // For sure the lock is currently held in a manner that it cannot be acquired, suspend ourself
        // at the end of the waiter list.

        auto* tail_waiter = m_shared_mutex.m_tail_waiter.load(std::memory_order::acquire);

        if (tail_waiter == nullptr)
        {
            m_shared_mutex.m_head_waiter = this;
            m_shared_mutex.m_tail_waiter = this;
        }
        else
        {
            tail_waiter->m_next = this;
            m_shared_mutex.m_tail_waiter         = this;
        }

        // If this is an exclusive lock acquire then mark it as so so that shared locks after this
        // exclusive one will also suspend so this exclusive lock doesn't get starved.
        if (m_exclusive)
        {
            ++m_shared_mutex.m_exclusive_waiters;
        }

        m_awaiting_coroutine = awaiting_coroutine;
        m_shared_mutex.m_mutex.unlock();
        return true;
    }

    auto await_resume() noexcept -> void { }

protected:
    friend class coro::shared_mutex<executor_type>;

    std::coroutine_handle<> m_awaiting_coroutine;
    shared_lock_operation* m_next{nullptr};
    coro::shared_mutex<executor_type>& m_shared_mutex;
    bool m_exclusive{false};
};

} // namespace detail

template<concepts::executor executor_type>
class shared_mutex
{
public:
    /**
     * @param e The executor for when multiple shared waiters can be woken up at the same time,
     *          each shared waiter will be scheduled to immediately run on this executor in
     *          parallel.
     */
    explicit shared_mutex(std::shared_ptr<executor_type> e) : m_executor(std::move(e))
    {
        if (m_executor == nullptr)
        {
            throw std::runtime_error{"coro::shared_mutex cannot have a nullptr executor"};
        }
    }
    ~shared_mutex() = default;

    shared_mutex(const shared_mutex&)                    = delete;
    shared_mutex(shared_mutex&&)                         = delete;
    auto operator=(const shared_mutex&) -> shared_mutex& = delete;
    auto operator=(shared_mutex&&) -> shared_mutex&      = delete;

    /**
     * Acquires the lock in a shared state, executes the scoped task, and then unlocks the shared lock.
     * Because unlocking a coro::shared_mutex is a task this scoped version cannot be returned as a RAII
     * object due to destructors not being able to be co_await'ed.
     * @param scoped_task The user's scoped task to execute after acquiring the shared lock.
     */
    [[nodiscard]] auto scoped_lock_shared(coro::task<void> scoped_task) -> coro::task<void>
    {
        co_await m_mutex.lock();
        co_await detail::shared_lock_operation<executor_type>{*this, false};
        co_await scoped_task;
        co_await unlock_shared();
        co_return;
    }

    /**
     * Acquires the lock in an exclusive state, executes the scoped task, and then unlocks the exclusive lock.
     * Because unlocking a coro::shared_mutex is a task this scoped version cannot be returned as a RAII
     * object due to destructors not being able to be co_await'ed.
     * @param scoped_task The user's scoped task to execute after acquiring the exclusive lock.
     */
    [[nodiscard]] auto scoped_lock(coro::task<void> scoped_task) -> coro::task<void>
    {
        co_await m_mutex.lock();
        co_await detail::shared_lock_operation<executor_type>{*this, true};
        co_await scoped_task;
        co_await unlock();
        co_return;
    }

    /**
     * Acquires the lock in a shared state. The shared_mutex must be unlock_shared() to release.
     * @return task
     */
    [[nodiscard]] auto lock_shared() -> coro::task<void>
    {
        co_await m_mutex.lock();
        co_await detail::shared_lock_operation<executor_type>{*this, false};
        co_return;
    }

    /**
     * Acquires the lock in an exclusive state. The shared_mutex must be unlock()'ed to release.
     * @return task
     */
    [[nodiscard]] auto lock() -> coro::task<void>
    {
        co_await m_mutex.lock();
        co_await detail::shared_lock_operation<executor_type>{*this, true};
        co_return;
    }

    /**
     * @return True if the lock could immediately be acquired in a shared state.
     */
    [[nodiscard]] auto try_lock_shared() -> bool
    {
        // To acquire the shared lock the state must be one of two states:
        //   1) unlocked
        //   2) shared locked with zero exclusive waiters
        //          Zero exclusive waiters prevents exclusive starvation if shared locks are
        //          always continuously happening.

        if (m_mutex.try_lock())
        {
            coro::scoped_lock lk{m_mutex};
            return try_lock_shared_locked();
        }
        return false;
    }

    /**
     * @return True if the lock could immediately be acquired in an exclusive state.
     */
    [[nodiscard]] auto try_lock() -> bool
    {
        // To acquire the exclusive lock the state must be unlocked.
        if (m_mutex.try_lock())
        {
            coro::scoped_lock lk{m_mutex};
            return try_lock_locked();
        }
        return false;
    }

    /**
     * Unlocks a single shared state user. *REQUIRES* that the lock was first acquired exactly once
     * via `lock_shared()` or `try_lock_shared() -> True` before being called, otherwise undefined
     * behavior.
     *
     * If the shared user count drops to zero and this lock has an exclusive waiter then the exclusive
     * waiter acquires the lock.
     */
    [[nodiscard]] auto unlock_shared() -> coro::task<void>
    {
        auto lk = co_await m_mutex.scoped_lock();
        --m_shared_users;

        // Only wake waiters from shared state if all shared users have completed.
        if (m_shared_users == 0)
        {
            if (m_head_waiter != nullptr)
            {
                wake_waiters(lk);
            }
            else
            {
                m_state = state::unlocked;
            }
        }

        co_return;
    }

    /**
     * Unlocks the mutex from its exclusive state. If there is a following exclusive waiter then
     * that exclusive waiter acquires the lock.  If there are 1 or more shared waiters then all the
     * shared waiters acquire the lock in a shared state in parallel and are resumed on the original
     * executor this shared mutex was created with.
     */
    [[nodiscard]] auto unlock() -> coro::task<void>
    {
        auto lk = co_await m_mutex.scoped_lock();
        if (m_head_waiter != nullptr)
        {
            wake_waiters(lk);
        }
        else
        {
            m_state = state::unlocked;
        }

        co_return;
    }

    /**
     * @brief Gets the executor that drives the shared mutex.
     *
     * @return std::shared_ptr<executor_type>
     */
    [[nodiscard]] auto executor() -> std::shared_ptr<executor_type>
    {
        return m_executor;
    }

private:
    friend struct detail::shared_lock_operation<executor_type>;

    enum class state
    {
        /// @brief The shared mutex is unlocked.
        unlocked,
        /// @brief The shared mutex is locked in shared mode.
        locked_shared,
        /// @brief The shared mutex is locked in exclusive mode.
        locked_exclusive
    };

    /// @brief This executor is for resuming multiple shared waiters.
    std::shared_ptr<executor_type> m_executor{nullptr};
    /// @brief Exclusive access for mutating the shared mutex's state.
    coro::mutex m_mutex;
    /// @brief The current state of the shared mutex.
    std::atomic<state> m_state{state::unlocked};

    /// @brief The current number of shared users that have acquired the lock.
    std::atomic<uint64_t> m_shared_users{0};
    /// @brief The current number of exclusive waiters waiting to acquire the lock.  This is used to block
    ///        new incoming shared lock attempts so the exclusive waiter is not starved.
    std::atomic<uint64_t> m_exclusive_waiters{0};

    std::atomic<detail::shared_lock_operation<executor_type>*> m_head_waiter{nullptr};
    std::atomic<detail::shared_lock_operation<executor_type>*> m_tail_waiter{nullptr};

    auto try_lock_shared_locked() -> bool
    {
        if (m_state == state::unlocked)
        {
            // If the shared mutex is unlocked put it into shared mode and add ourself as using the lock.
            m_state = state::locked_shared;
            ++m_shared_users;
            return true;
        }
        else if (m_state == state::locked_shared && m_exclusive_waiters == 0)
        {
            // If the shared mutex is in a shared locked state and there are no exclusive waiters
            // the add ourself as using the lock.
            ++m_shared_users;
            return true;
        }

        // If the lock is in shared mode but there are exclusive waiters then we will also wait so
        // the writers are not starved.

        // If the lock is in exclusive mode already then we need to wait.

        return false;
    }

    auto try_lock_locked() -> bool
    {
        if (m_state == state::unlocked)
        {
            m_state = state::locked_exclusive;
            return true;
        }
        return false;
    }

    auto wake_waiters(coro::scoped_lock& lk) -> void
    {
        // First determine what the next lock state will be based on the first waiter.
        if (m_head_waiter.load()->m_exclusive)
        {
            // If its exclusive then only this waiter can be woken up.
            m_state                   = state::locked_exclusive;
            detail::shared_lock_operation<executor_type>* to_resume = m_head_waiter.load();
            m_head_waiter             = m_head_waiter.load()->m_next;
            --m_exclusive_waiters;
            if (m_head_waiter == nullptr)
            {
                m_tail_waiter = nullptr;
            }

            // Since this is an exclusive lock waiting we can resume it directly.
            lk.unlock();
            to_resume->m_awaiting_coroutine.resume();
        }
        else
        {
            // If its shared then we will scan forward and awake all shared waiters onto the given
            // thread pool so they can run in parallel.
            m_state = state::locked_shared;
            do
            {
                detail::shared_lock_operation<executor_type>* to_resume = m_head_waiter.load();
                m_head_waiter             = m_head_waiter.load()->m_next;
                if (m_head_waiter == nullptr)
                {
                    m_tail_waiter = nullptr;
                }
                ++m_shared_users;

                m_executor->resume(to_resume->m_awaiting_coroutine);
            } while (m_head_waiter != nullptr && !m_head_waiter.load()->m_exclusive);

            // Cannot unlock until the entire set of shared waiters has been traversed.  I think this
            // makes more sense than allocating space for all the shared waiters, unlocking, and then
            // resuming in a batch?
            lk.unlock();
        }
    }
};

} // namespace coro

1	#pragma once
2
3	#include "coro/concepts/executor.hpp"
4	#include "coro/mutex.hpp"
5	#include "coro/task.hpp"
6
7	#include <atomic>
8	#include <coroutine>
9
10	namespace coro
11	{
12	template<concepts::executor executor_type>
13	class shared_mutex;
14
15	namespace detail
16	{
17	template<concepts::executor executor_type>
18	struct shared_lock_operation
19	{
20	explicit shared_lock_operation(coro::shared_mutex<executor_type>& shared_mutex, const bool exclusive)	87✔
21	: m_shared_mutex(shared_mutex),	87✔
22	m_exclusive(exclusive)	87✔
23	{}	87✔
24	~shared_lock_operation() = default;
25
26	shared_lock_operation(const shared_lock_operation&) = delete;
27	shared_lock_operation(shared_lock_operation&&) = delete;
28	auto operator=(const shared_lock_operation&) -> shared_lock_operation& = delete;
29	auto operator=(shared_lock_operation&&) -> shared_lock_operation& = delete;
30
31	auto await_ready() const noexcept -> bool	87✔
32	{
33	// If either mode can be acquired, unlock the internal mutex and resume.
34
35	if (m_exclusive)	87✔
36	{
37	if (m_shared_mutex.try_lock_locked())	3✔
38	{
39	m_shared_mutex.m_mutex.unlock();	3✔
40	return true;	3✔
41	}
42	}
43	else if (m_shared_mutex.try_lock_shared_locked())	84✔
44	{
45	m_shared_mutex.m_mutex.unlock();	43✔
46	return true;	43✔
47	}
48
49	return false;	41✔
50	}
51
52	auto await_suspend(std::coroutine_handle<> awaiting_coroutine) noexcept -> bool	41✔
53	{
54	// For sure the lock is currently held in a manner that it cannot be acquired, suspend ourself
55	// at the end of the waiter list.
56
57	auto* tail_waiter = m_shared_mutex.m_tail_waiter.load(std::memory_order::acquire);	41✔
58
59	if (tail_waiter == nullptr)	41✔
60	{
61	m_shared_mutex.m_head_waiter = this;	1✔
62	m_shared_mutex.m_tail_waiter = this;	1✔
63	}
64	else
65	{
66	tail_waiter->m_next = this;	40✔
67	m_shared_mutex.m_tail_waiter = this;	40✔
68	}
69
70	// If this is an exclusive lock acquire then mark it as so so that shared locks after this
71	// exclusive one will also suspend so this exclusive lock doesn't get starved.
72	if (m_exclusive)	41✔
73	{
NEW 74	++m_shared_mutex.m_exclusive_waiters;	×
75	}
76
77	m_awaiting_coroutine = awaiting_coroutine;	41✔
78	m_shared_mutex.m_mutex.unlock();	41✔
79	return true;	41✔
80	}
81
82	auto await_resume() noexcept -> void { }	87✔
83
84	protected:
85	friend class coro::shared_mutex<executor_type>;
86
87	std::coroutine_handle<> m_awaiting_coroutine;
88	shared_lock_operation* m_next{nullptr};
89	coro::shared_mutex<executor_type>& m_shared_mutex;
90	bool m_exclusive{false};
91	};
92
93	} // namespace detail
94
95	template<concepts::executor executor_type>
96	class shared_mutex
97	{
98	public:
99	/**
100	* @param e The executor for when multiple shared waiters can be woken up at the same time,
101	* each shared waiter will be scheduled to immediately run on this executor in
102	* parallel.
103	*/
104	explicit shared_mutex(std::shared_ptr<executor_type> e) : m_executor(std::move(e))	5✔
105	{
106	if (m_executor == nullptr)	5✔
107	{
NEW 108	throw std::runtime_error{"coro::shared_mutex cannot have a nullptr executor"};	×
109	}
110	}	5✔
111	~shared_mutex() = default;	5✔
112
113	shared_mutex(const shared_mutex&) = delete;
114	shared_mutex(shared_mutex&&) = delete;
115	auto operator=(const shared_mutex&) -> shared_mutex& = delete;
116	auto operator=(shared_mutex&&) -> shared_mutex& = delete;
117
118	/**
119	* Acquires the lock in a shared state, executes the scoped task, and then unlocks the shared lock.
120	* Because unlocking a coro::shared_mutex is a task this scoped version cannot be returned as a RAII
121	* object due to destructors not being able to be co_await'ed.
122	* @param scoped_task The user's scoped task to execute after acquiring the shared lock.
123	*/
124	[[nodiscard]] auto scoped_lock_shared(coro::task<void> scoped_task) -> coro::task<void>	1✔
125	{
126	co_await m_mutex.lock();
127	co_await detail::shared_lock_operation<executor_type>{*this, false};
128	co_await scoped_task;
129	co_await unlock_shared();
130	co_return;
131	}	2✔
132
133	/**
134	* Acquires the lock in an exclusive state, executes the scoped task, and then unlocks the exclusive lock.
135	* Because unlocking a coro::shared_mutex is a task this scoped version cannot be returned as a RAII
136	* object due to destructors not being able to be co_await'ed.
137	* @param scoped_task The user's scoped task to execute after acquiring the exclusive lock.
138	*/
139	[[nodiscard]] auto scoped_lock(coro::task<void> scoped_task) -> coro::task<void>	1✔
140	{
141	co_await m_mutex.lock();
142	co_await detail::shared_lock_operation<executor_type>{*this, true};
143	co_await scoped_task;
144	co_await unlock();
145	co_return;
146	}	2✔
147
148	/**
149	* Acquires the lock in a shared state. The shared_mutex must be unlock_shared() to release.
150	* @return task
151	*/
152	[[nodiscard]] auto lock_shared() -> coro::task<void>	83✔
153	{
154	co_await m_mutex.lock();
155	co_await detail::shared_lock_operation<executor_type>{*this, false};
156	co_return;
157	}	166✔
158
159	/**
160	* Acquires the lock in an exclusive state. The shared_mutex must be unlock()'ed to release.
161	* @return task
162	*/
163	[[nodiscard]] auto lock() -> coro::task<void>	2✔
164	{
165	co_await m_mutex.lock();
166	co_await detail::shared_lock_operation<executor_type>{*this, true};
167	co_return;
168	}	4✔
169
170	/**
171	* @return True if the lock could immediately be acquired in a shared state.
172	*/
173	[[nodiscard]] auto try_lock_shared() -> bool	6✔
174	{
175	// To acquire the shared lock the state must be one of two states:
176	// 1) unlocked
177	// 2) shared locked with zero exclusive waiters
178	// Zero exclusive waiters prevents exclusive starvation if shared locks are
179	// always continuously happening.
180
181	if (m_mutex.try_lock())	6✔
182	{
183	coro::scoped_lock lk{m_mutex};	6✔
184	return try_lock_shared_locked();	6✔
185	}	6✔
NEW 186	return false;	×
187	}
188
189	/**
190	* @return True if the lock could immediately be acquired in an exclusive state.
191	*/
192	[[nodiscard]] auto try_lock() -> bool	12✔
193	{
194	// To acquire the exclusive lock the state must be unlocked.
195	if (m_mutex.try_lock())	12✔
196	{
197	coro::scoped_lock lk{m_mutex};	12✔
198	return try_lock_locked();	12✔
199	}	12✔
NEW 200	return false;	×
201	}
202
203	/**
204	* Unlocks a single shared state user. REQUIRES that the lock was first acquired exactly once
205	* via `lock_shared()` or `try_lock_shared() -> True` before being called, otherwise undefined
206	* behavior.
207	*
208	* If the shared user count drops to zero and this lock has an exclusive waiter then the exclusive
209	* waiter acquires the lock.
210	*/
211	[[nodiscard]] auto unlock_shared() -> coro::task<void>	88✔
212	{
213	auto lk = co_await m_mutex.scoped_lock();
214	--m_shared_users;
215
216	// Only wake waiters from shared state if all shared users have completed.
217	if (m_shared_users == 0)
218	{
219	if (m_head_waiter != nullptr)
220	{
221	wake_waiters(lk);
222	}
223	else
224	{
225	m_state = state::unlocked;
226	}
227	}
228
229	co_return;
230	}	176✔
231
232	/**
233	* Unlocks the mutex from its exclusive state. If there is a following exclusive waiter then
234	* that exclusive waiter acquires the lock. If there are 1 or more shared waiters then all the
235	* shared waiters acquire the lock in a shared state in parallel and are resumed on the original
236	* executor this shared mutex was created with.
237	*/
238	[[nodiscard]] auto unlock() -> coro::task<void>	11✔
239	{
240	auto lk = co_await m_mutex.scoped_lock();
241	if (m_head_waiter != nullptr)
242	{
243	wake_waiters(lk);
244	}
245	else
246	{
247	m_state = state::unlocked;
248	}
249
250	co_return;
251	}	22✔
252
253	/**
254	* @brief Gets the executor that drives the shared mutex.
255	*
256	* @return std::shared_ptr<executor_type>
257	*/
NEW 258	[[nodiscard]] auto executor() -> std::shared_ptr<executor_type>	×
259	{
NEW 260	return m_executor;	×
261	}
262
263	private:
264	friend struct detail::shared_lock_operation<executor_type>;
265
266	enum class state
267	{
268	/// @brief The shared mutex is unlocked.
269	unlocked,
270	/// @brief The shared mutex is locked in shared mode.
271	locked_shared,
272	/// @brief The shared mutex is locked in exclusive mode.
273	locked_exclusive
274	};
275
276	/// @brief This executor is for resuming multiple shared waiters.
277	std::shared_ptr<executor_type> m_executor{nullptr};
278	/// @brief Exclusive access for mutating the shared mutex's state.
279	coro::mutex m_mutex;
280	/// @brief The current state of the shared mutex.
281	std::atomic<state> m_state{state::unlocked};
282
283	/// @brief The current number of shared users that have acquired the lock.
284	std::atomic<uint64_t> m_shared_users{0};
285	/// @brief The current number of exclusive waiters waiting to acquire the lock. This is used to block
286	/// new incoming shared lock attempts so the exclusive waiter is not starved.
287	std::atomic<uint64_t> m_exclusive_waiters{0};
288
289	std::atomic<detail::shared_lock_operation<executor_type>*> m_head_waiter{nullptr};
290	std::atomic<detail::shared_lock_operation<executor_type>*> m_tail_waiter{nullptr};
291
292	auto try_lock_shared_locked() -> bool	90✔
293	{
294	if (m_state == state::unlocked)	90✔
295	{
296	// If the shared mutex is unlocked put it into shared mode and add ourself as using the lock.
297	m_state = state::locked_shared;	44✔
298	++m_shared_users;	44✔
299	return true;	44✔
300	}
301	else if (m_state == state::locked_shared && m_exclusive_waiters == 0)	46✔
302	{
303	// If the shared mutex is in a shared locked state and there are no exclusive waiters
304	// the add ourself as using the lock.
305	++m_shared_users;	3✔
306	return true;	3✔
307	}
308
309	// If the lock is in shared mode but there are exclusive waiters then we will also wait so
310	// the writers are not starved.
311
312	// If the lock is in exclusive mode already then we need to wait.
313
314	return false;	43✔
315	}
316
317	auto try_lock_locked() -> bool	15✔
318	{
319	if (m_state == state::unlocked)	15✔
320	{
321	m_state = state::locked_exclusive;	11✔
322	return true;	11✔
323	}
324	return false;	4✔
325	}
326
327	auto wake_waiters(coro::scoped_lock& lk) -> void	1✔
328	{
329	// First determine what the next lock state will be based on the first waiter.
330	if (m_head_waiter.load()->m_exclusive)	1✔
331	{
332	// If its exclusive then only this waiter can be woken up.
333	m_state = state::locked_exclusive;	×
334	detail::shared_lock_operation<executor_type>* to_resume = m_head_waiter.load();	×
NEW 335	m_head_waiter = m_head_waiter.load()->m_next;	×
NEW 336	--m_exclusive_waiters;	×
337	if (m_head_waiter == nullptr)	×
338	{
NEW 339	m_tail_waiter = nullptr;	×
340	}
341
342	// Since this is an exclusive lock waiting we can resume it directly.
NEW 343	lk.unlock();	×
NEW 344	to_resume->m_awaiting_coroutine.resume();	×
345	}
346	else
347	{
348	// If its shared then we will scan forward and awake all shared waiters onto the given
349	// thread pool so they can run in parallel.
350	m_state = state::locked_shared;	1✔
351	do
352	{
353	detail::shared_lock_operation<executor_type>* to_resume = m_head_waiter.load();	41✔
354	m_head_waiter = m_head_waiter.load()->m_next;	41✔
355	if (m_head_waiter == nullptr)	41✔
356	{
357	m_tail_waiter = nullptr;	1✔
358	}
359	++m_shared_users;	41✔
360
361	m_executor->resume(to_resume->m_awaiting_coroutine);	41✔
362	} while (m_head_waiter != nullptr && !m_head_waiter.load()->m_exclusive);	41✔
363
364	// Cannot unlock until the entire set of shared waiters has been traversed. I think this
365	// makes more sense than allocating space for all the shared waiters, unlocking, and then
366	// resuming in a batch?
367	lk.unlock();	1✔
368	}
369	}	1✔
370	};
371
372	} // namespace coro

jbaldwin / libcoro / 16708247588

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