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/*
* Copyright (C) 2025 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/command_stream/host_function_worker_thread_pool.h"
#include "shared/source/command_stream/host_function.h"
namespace NEO {
HostFunctionThreadPool::HostFunctionThreadPool(int32_t threadsInThreadPoolLimit) {
if (threadsInThreadPoolLimit == HostFunctionThreadPoolHelper::unlimitedThreads) {
unlimitedThreads = true;
} else {
threadsLimit = static_cast<uint32_t>(threadsInThreadPoolLimit);
}
}
HostFunctionThreadPool::~HostFunctionThreadPool() = default;
void HostFunctionThreadPool::registerThread() noexcept {
if ((threads.size() < threadsLimit) || unlimitedThreads) {
threads.emplace_back(([this](std::stop_token st) {
this->workerLoop(st);
}));
}
}
void HostFunctionThreadPool::shutdown() noexcept {
for (auto &thread : threads) {
thread.request_stop();
}
semaphore.release(static_cast<ptrdiff_t>(threads.size()));
for (auto &thread : threads) {
thread.join();
}
{
std::lock_guard lock{this->hostFunctionsMutex};
hostFunctions.clear();
}
threads.clear();
}
void HostFunctionThreadPool::registerHostFunctionToExecute(HostFunctionStreamer *streamer, HostFunction &&hostFunction) {
{
std::unique_lock lock{this->hostFunctionsMutex};
hostFunctions.emplace_back(streamer, std::move(hostFunction));
}
semaphore.release();
}
void NEO::HostFunctionThreadPool::workerLoop(std::stop_token st) noexcept {
while (st.stop_requested() == false) {
semaphore.acquire();
if (st.stop_requested()) {
return;
}
executeHostFunction();
}
}
void HostFunctionThreadPool::executeHostFunction() noexcept {
std::unique_lock lock{this->hostFunctionsMutex};
auto [streamer, hostFunction] = std::move(hostFunctions.front());
hostFunctions.pop_front();
lock.unlock();
hostFunction.invoke();
streamer->signalHostFunctionCompletion(hostFunction);
}
} // namespace NEO
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