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//===----------------------- Queue.h - RPC Queue ------------------*-c++-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_UNITTESTS_EXECUTIONENGINE_ORC_QUEUECHANNEL_H
#define LLVM_UNITTESTS_EXECUTIONENGINE_ORC_QUEUECHANNEL_H
#include "llvm/ExecutionEngine/Orc/RawByteChannel.h"
#include "llvm/Support/Error.h"
#include <condition_variable>
#include <queue>
namespace llvm {
class QueueChannelError : public ErrorInfo<QueueChannelError> {
public:
static char ID;
};
class QueueChannelClosedError
: public ErrorInfo<QueueChannelClosedError, QueueChannelError> {
public:
static char ID;
std::error_code convertToErrorCode() const override {
return inconvertibleErrorCode();
}
void log(raw_ostream &OS) const override {
OS << "Queue closed";
}
};
class Queue : public std::queue<char> {
public:
using ErrorInjector = std::function<Error()>;
Queue()
: ReadError([]() { return Error::success(); }),
WriteError([]() { return Error::success(); }) {}
Queue(const Queue&) = delete;
Queue& operator=(const Queue&) = delete;
Queue(Queue&&) = delete;
Queue& operator=(Queue&&) = delete;
std::mutex &getMutex() { return M; }
std::condition_variable &getCondVar() { return CV; }
Error checkReadError() { return ReadError(); }
Error checkWriteError() { return WriteError(); }
void setReadError(ErrorInjector NewReadError) {
{
std::lock_guard<std::mutex> Lock(M);
ReadError = std::move(NewReadError);
}
CV.notify_one();
}
void setWriteError(ErrorInjector NewWriteError) {
std::lock_guard<std::mutex> Lock(M);
WriteError = std::move(NewWriteError);
}
private:
std::mutex M;
std::condition_variable CV;
std::function<Error()> ReadError, WriteError;
};
class QueueChannel : public orc::rpc::RawByteChannel {
public:
QueueChannel(std::shared_ptr<Queue> InQueue,
std::shared_ptr<Queue> OutQueue)
: InQueue(InQueue), OutQueue(OutQueue) {}
QueueChannel(const QueueChannel&) = delete;
QueueChannel& operator=(const QueueChannel&) = delete;
QueueChannel(QueueChannel&&) = delete;
QueueChannel& operator=(QueueChannel&&) = delete;
Error readBytes(char *Dst, unsigned Size) override {
std::unique_lock<std::mutex> Lock(InQueue->getMutex());
while (Size) {
{
Error Err = InQueue->checkReadError();
while (!Err && InQueue->empty()) {
InQueue->getCondVar().wait(Lock);
Err = InQueue->checkReadError();
}
if (Err)
return Err;
}
*Dst++ = InQueue->front();
--Size;
++NumRead;
InQueue->pop();
}
return Error::success();
}
Error appendBytes(const char *Src, unsigned Size) override {
std::unique_lock<std::mutex> Lock(OutQueue->getMutex());
while (Size--) {
if (Error Err = OutQueue->checkWriteError())
return Err;
OutQueue->push(*Src++);
++NumWritten;
}
OutQueue->getCondVar().notify_one();
return Error::success();
}
Error send() override { return Error::success(); }
void close() {
auto ChannelClosed = []() { return make_error<QueueChannelClosedError>(); };
InQueue->setReadError(ChannelClosed);
InQueue->setWriteError(ChannelClosed);
OutQueue->setReadError(ChannelClosed);
OutQueue->setWriteError(ChannelClosed);
}
uint64_t NumWritten = 0;
uint64_t NumRead = 0;
private:
std::shared_ptr<Queue> InQueue;
std::shared_ptr<Queue> OutQueue;
};
inline std::pair<std::unique_ptr<QueueChannel>, std::unique_ptr<QueueChannel>>
createPairedQueueChannels() {
auto Q1 = std::make_shared<Queue>();
auto Q2 = std::make_shared<Queue>();
auto C1 = llvm::make_unique<QueueChannel>(Q1, Q2);
auto C2 = llvm::make_unique<QueueChannel>(Q2, Q1);
return std::make_pair(std::move(C1), std::move(C2));
}
}
#endif
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