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01466adc13
Provide some statistics about asynchronous IO reads and writes: - number of pending operations - number of completion callbacks that are currently being executed - number of completion callbacks that are currently queued (due to restriction on number of IO threads) - total number of IOs finished - total time to wait for free IO slot - total number of completions that were queued. Also revert tpool InnoDB perfschema instrumentation (MDEV-31048) That instrumentation of cache mutex did not bring any revelation ( the mutex is taken for a couple of instructions), and made it impossible to use tpool outside of the server (e.g in mariadbimport/dump)
127 lines
3.2 KiB
C++
127 lines
3.2 KiB
C++
/* Copyright(C) 2019 MariaDB Corporation.
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This program is free software; you can redistribute itand /or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 - 1301 USA*/
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#include <tpool.h>
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#include <queue>
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#include <mutex>
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#include <condition_variable>
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#include <tpool_structs.h>
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#include <thread>
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#include <assert.h>
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#ifndef _WIN32
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#include <unistd.h> // usleep
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#endif
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namespace tpool
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{
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/**
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Task_group constructor
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@param max_threads - maximum number of threads allowed to execute
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tasks from the group at the same time.
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@param enable_task_release - if true (default), task::release() will be
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called after task execution.'false' should only be used in rare cases
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when accessing memory, pointed by task structures, would be unsafe after.
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the callback. Also 'false' is only possible ,if task::release() is a trivial function
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*/
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task_group::task_group(unsigned int max_concurrency,
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bool enable_task_release)
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:
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m_queue(8),
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m_mtx(),
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m_total_tasks(0),
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m_total_enqueues(0),
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m_tasks_running(),
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m_max_concurrent_tasks(max_concurrency),
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m_enable_task_release(enable_task_release)
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{};
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void task_group::set_max_tasks(unsigned int max_concurrency)
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{
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std::unique_lock<std::mutex> lk(m_mtx);
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m_max_concurrent_tasks = max_concurrency;
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}
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void task_group::execute(task* t)
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{
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std::unique_lock<std::mutex> lk(m_mtx);
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if (m_tasks_running == m_max_concurrent_tasks)
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{
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/* Queue for later execution by another thread.*/
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m_queue.push(t);
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m_total_enqueues++;
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return;
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}
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m_tasks_running++;
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for (;;)
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{
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lk.unlock();
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if (t)
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{
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t->m_func(t->m_arg);
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if (m_enable_task_release)
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t->release();
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}
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lk.lock();
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m_total_tasks++;
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if (m_queue.empty())
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break;
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t = m_queue.front();
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m_queue.pop();
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}
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m_tasks_running--;
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}
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void task_group::cancel_pending(task* t)
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{
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std::unique_lock<std::mutex> lk(m_mtx);
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if (!t)
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m_queue.clear();
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for (auto it = m_queue.begin(); it != m_queue.end(); it++)
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{
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if (*it == t)
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{
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(*it)->release();
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(*it) = nullptr;
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}
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}
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}
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void task_group::get_stats(group_stats *stats)
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{
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std::lock_guard<std::mutex> lk(m_mtx);
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stats->tasks_running= m_tasks_running;
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stats->queue_size= m_queue.size();
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stats->total_tasks_executed= m_total_tasks;
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stats->total_tasks_enqueued= m_total_enqueues;
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}
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task_group::~task_group()
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{
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std::unique_lock<std::mutex> lk(m_mtx);
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assert(m_queue.empty());
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while (m_tasks_running)
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{
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lk.unlock();
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#ifndef _WIN32
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usleep(1000);
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#else
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Sleep(1);
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#endif
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lk.lock();
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}
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}
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}
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