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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* \class storage::framework::ThreadPool
* \ingroup thread
*
* \brief A threadpool implementation usable by storage components.
*
* Using this threadpool interface, we can use a threadpool without depending
* on the actual implementation. Also, as information is provided of the
* threads, monitoring tools, like the deadlock detector can extract information
* about the threads.
*/
#pragma once
#include <atomic>
#include <vespa/vespalib/util/cpu_usage.h>
#include <optional>
#include <vector>
namespace storage::framework {
class Thread;
struct Runnable;
/** Interface used to access data for the existing threads. */
struct ThreadVisitor {
virtual ~ThreadVisitor() = default;
virtual void visitThread(const Thread& thread) = 0;
};
struct ThreadPool {
virtual ~ThreadPool() = default;
virtual std::unique_ptr<Thread>
startThread(Runnable&, vespalib::stringref id, vespalib::duration waitTime,
vespalib::duration maxProcessTime, int ticksBeforeWait,
std::optional<vespalib::CpuUsage::Category> cpu_category) = 0;
virtual void visitThreads(ThreadVisitor&) const = 0;
};
}
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