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/*
* Copyright (C) 2018-2025 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/memory_manager/deferred_deleter.h"
#include "shared/source/memory_manager/deferrable_deletion.h"
#include "shared/source/os_interface/os_thread.h"
namespace NEO {
DeferredDeleter::DeferredDeleter() = default;
void DeferredDeleter::stop() {
// Called with threadMutex acquired
if (worker != nullptr) {
// Working thread was created so we can safely stop it
std::unique_lock<std::mutex> lock(queueMutex);
// Make sure that working thread really started
while (!doWorkInBackground) {
lock.unlock();
lock.lock();
}
// Signal working thread to finish its job
doWorkInBackground = false;
lock.unlock();
condition.notify_one();
worker->detach();
// Wait for the working job to exit main loop
while (!exitedMainLoop) {
std::this_thread::yield();
}
// Delete working thread
worker.reset();
}
drain(false, false);
}
void DeferredDeleter::safeStop() {
std::lock_guard<std::mutex> lock(threadMutex);
stop();
}
DeferredDeleter::~DeferredDeleter() {
safeStop();
}
void DeferredDeleter::deferDeletion(DeferrableDeletion *deletion) {
std::unique_lock<std::mutex> lock(queueMutex);
this->elementsToRelease++;
if (deletion->isExternalHostptr()) {
this->hostptrsToRelease++;
}
queue.pushTailOne(*deletion);
lock.unlock();
condition.notify_one();
}
void DeferredDeleter::addClient() {
std::lock_guard<std::mutex> lock(threadMutex);
++numClients;
ensureThread();
}
void DeferredDeleter::removeClient() {
std::lock_guard<std::mutex> lock(threadMutex);
--numClients;
if (numClients == 0) {
stop();
}
}
void DeferredDeleter::ensureThread() {
if (worker != nullptr) {
return;
}
exitedMainLoop = false;
worker = Thread::createFunc(run, reinterpret_cast<void *>(this));
}
bool DeferredDeleter::areElementsReleased(bool hostptrsOnly) {
return hostptrsOnly ? this->hostptrsToRelease == 0 : this->elementsToRelease == 0;
}
bool DeferredDeleter::shouldStop() {
return !doWorkInBackground;
}
void *DeferredDeleter::run(void *arg) {
auto self = reinterpret_cast<DeferredDeleter *>(arg);
std::unique_lock<std::mutex> lock(self->queueMutex);
// Mark that working thread really started
self->doWorkInBackground = true;
do {
if (self->queue.peekIsEmpty()) {
// Wait for signal that some items are ready to be deleted
self->condition.wait(lock);
}
lock.unlock();
// Delete items placed into deferred delete queue
self->clearQueue(false);
lock.lock();
// Check whether working thread should be stopped
} while (!self->shouldStop());
lock.unlock();
self->exitedMainLoop = true;
return nullptr;
}
void DeferredDeleter::drain(bool blocking, bool hostptrsOnly) {
clearQueue(hostptrsOnly);
if (blocking) {
while (!areElementsReleased(hostptrsOnly))
;
}
}
void DeferredDeleter::clearQueue(bool hostptrsOnly) {
do {
auto deletion = queue.removeFrontOne();
if (deletion) {
bool isDeletionHostptr = deletion->isExternalHostptr();
if ((!hostptrsOnly || isDeletionHostptr) && deletion->apply()) {
this->elementsToRelease--;
if (isDeletionHostptr) {
this->hostptrsToRelease--;
}
} else {
queue.pushTailOne(*deletion.release());
}
}
} while (hostptrsOnly ? !areElementsReleased(hostptrsOnly) : !queue.peekIsEmpty());
}
} // namespace NEO
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