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// -*- C++ -*-
//
// Package: FWCore/SharedMemory
// Class : WriteBuffer
//
// Implementation:
// [Notes on implementation]
//
// Original Author: Chris Jones
// Created: 21/01/2020
//
// system include files
// user include files
#include "FWCore/SharedMemory/interface/WriteBuffer.h"
#include "FWCore/Utilities/interface/Exception.h"
//
// constants, enums and typedefs
//
using namespace edm::shared_memory;
//
// static data member definitions
//
//
// constructors and destructor
//
WriteBuffer::SMOwner::SMOwner(std::string const& iName, std::size_t iLength) : name_(iName) {
//do a remove first just in case a previous job had a failure and left a same named
// memory object
boost::interprocess::shared_memory_object::remove(iName.c_str());
sm_ = std::make_unique<boost::interprocess::managed_shared_memory>(
boost::interprocess::create_only, iName.c_str(), iLength);
}
WriteBuffer::SMOwner::~SMOwner() {
if (sm_) {
boost::interprocess::shared_memory_object::remove(name_.c_str());
}
}
WriteBuffer::SMOwner& WriteBuffer::SMOwner::operator=(WriteBuffer::SMOwner&& other) {
if (sm_) {
boost::interprocess::shared_memory_object::remove(name_.c_str());
}
name_ = std::move(other.name_);
sm_ = std::move(other.sm_);
return *this;
}
void WriteBuffer::SMOwner::reset() { *this = SMOwner(); }
WriteBuffer::~WriteBuffer() {
if (sm_) {
sm_->destroy<char>(buffer_names::kBuffer);
}
}
//
// member functions
//
void WriteBuffer::growBuffer(std::size_t iLength) {
int newBuffer = (bufferInfo_->index_ + 1) % 2;
bool destroyedBuffer = false;
auto oldIndex = bufferInfo_->index_;
if (sm_) {
destroyedBuffer = true;
try {
sm_->destroy<char>(buffer_names::kBuffer);
} catch (boost::interprocess::interprocess_exception const& iExcept) {
throw cms::Exception("SharedMemory")
<< "in growBuffer while destroying the shared memory object the following exception was caught\n"
<< iExcept.what();
}
try {
sm_.reset();
} catch (boost::interprocess::interprocess_exception const& iExcept) {
throw cms::Exception("SharedMemory")
<< "in growBuffer while removing the shared memory object named '" << bufferNames_[bufferInfo_->index_]
<< "' the following exception was caught\n"
<< iExcept.what();
}
}
try {
sm_ = SMOwner(bufferNames_[newBuffer], iLength + 1024);
} catch (boost::interprocess::interprocess_exception const& iExcept) {
throw cms::Exception("SharedMemory") << "in growBuffer while creating the shared memory object '"
<< bufferNames_[newBuffer] << "' of length " << iLength + 1024
<< " the following exception was caught\n"
<< iExcept.what();
}
assert(sm_.get());
bufferSize_ = iLength;
bufferInfo_->index_ = newBuffer;
bufferInfo_->identifier_ = bufferInfo_->identifier_ + 1;
try {
buffer_ = sm_->construct<char>(buffer_names::kBuffer)[iLength](0);
} catch (boost::interprocess::interprocess_exception const& iExcept) {
cms::Exception except("SharedMemory");
except << "boost::interprocess exception caught: " << iExcept.what();
{
std::ostringstream os;
os << "in growBuffer while creating the buffer within the shared memory object '" << bufferNames_[newBuffer]
<< "' with index " << newBuffer << " where the buffer is of length " << iLength;
if (destroyedBuffer) {
os << " after destroying the previous shared memory object '" << bufferNames_[oldIndex] << "' with index "
<< oldIndex;
}
except.addContext(os.str());
}
throw except;
}
assert(buffer_);
}
//
// const member functions
//
//
// static member functions
//
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