edm::SharedResourcesRegistry Class Reference

#include <SharedResourcesRegistry.h>

Public Member Functions
SharedResourcesAcquirer	createAcquirer (std::vector< std::string > const &) const
std::pair< SharedResourcesAcquirer, std::shared_ptr< std::recursive_mutex > >	createAcquirerForSourceDelayedReader ()
const SharedResourcesRegistry &	operator= (const SharedResourcesRegistry &)=delete
void	registerSharedResource (const std::string &)
	A resource name must be registered before it can be used in the createAcquirer call. More...
	SharedResourcesRegistry (const SharedResourcesRegistry &)=delete

Static Public Member Functions
static SharedResourcesRegistry *	instance ()

Static Public Attributes
static const std::string	kLegacyModuleResourceName {"__legacy__"}
	All legacy modules share this resource. More...

Private Member Functions
	SharedResourcesRegistry ()
	~SharedResourcesRegistry ()=default

Private Attributes
unsigned int	nLegacy_
edm::propagate_const< std::shared_ptr< SerialTaskQueue > >	queueForDelayedReader_
edm::propagate_const< std::shared_ptr< std::recursive_mutex > >	resourceForDelayedReader_
std::map< std::string, std::pair< std::shared_ptr< SerialTaskQueue >, unsigned int > >	resourceMap_

Friends
class	::testSharedResourcesRegistry

Detailed Description

Definition at line 39 of file SharedResourcesRegistry.h.

Constructor & Destructor Documentation

SharedResourcesRegistry() [1/2]

edm::SharedResourcesRegistry::SharedResourcesRegistry ( const SharedResourcesRegistry &  )

delete

SharedResourcesRegistry() [2/2]

SharedResourcesRegistry::SharedResourcesRegistry ( )

private

Definition at line 30 of file SharedResourcesRegistry.cc.

: nLegacy_(0) {}

~SharedResourcesRegistry()

edm::SharedResourcesRegistry::~SharedResourcesRegistry ( )

privatedefault

Member Function Documentation

createAcquirer()

SharedResourcesAcquirer SharedResourcesRegistry::createAcquirer

(

std::vector< std::string > const &

resourceNames

)

const

Definition at line 75 of file SharedResourcesRegistry.cc.

References cms::cuda::assert(), spr::find(), kLegacyModuleResourceName, eostools::move(), Skims_PA_cff::name, and resourceMap_.

Referenced by edm::one::impl::SharedResourcesUser< T >::createAcquirer().

                                                                                                                 {
    // The acquirer will acquire the shared resources declared by a module
    // so that only it can use those resources while it runs. The other
    // modules using the same resource will not be run until the module
    // that acquired the resources completes its task.

    // The legacy shared resource is special.
    // Legacy modules cannot run concurrently with each other or
    // any other module that has declared any shared resource. Treat
    // one modules that call usesResource with no argument in the
    // same way.

    // Sort by how often used and then by name
    // Consistent sorting avoids deadlocks and this particular order optimizes performance
    std::map<std::pair<unsigned int, std::string>, std::shared_ptr<SerialTaskQueue>> sortedResources;

    // Is this acquirer for a module that depends on the legacy shared resource?
    if (std::find(resourceNames.begin(), resourceNames.end(), kLegacyModuleResourceName) != resourceNames.end()) {
      for (auto const& resource : resourceMap_) {
        // It's redundant to declare legacy if the legacy modules
        // all declare all the other resources, so just skip it.
        // But if the only shared resource is the legacy resource don't skip it.
        if (resource.first == kLegacyModuleResourceName && resourceMap_.size() > 1)
          continue;
        //legacy modules are not allowed to depend on ES shared resources
        if (resource.first.substr(0, 3) == "es_")
          continue;
        //If only one module wants it, it really isn't shared
        if (resource.second.second > 1) {
          sortedResources.insert(
              std::make_pair(std::make_pair(resource.second.second, resource.first), resource.second.first));
        }
      }
      // Handle cases where the module does not declare the legacy resource
    } else {
      for (auto const& name : resourceNames) {
        auto resource = resourceMap_.find(name);
        assert(resource != resourceMap_.end());
        //If only one module wants it, it really isn't shared
        if (resource->second.second > 1) {
          sortedResources.insert(
              std::make_pair(std::make_pair(resource->second.second, resource->first), resource->second.first));
        }
      }
    }

    std::vector<std::shared_ptr<SerialTaskQueue>> queues;
    queues.reserve(sortedResources.size());
    for (auto const& resource : sortedResources) {
      queues.push_back(resource.second);
    }
    if (queues.empty()) {
      //Calling code is depending on there being at least one shared queue
      queues.reserve(1);
      queues.push_back(std::make_shared<SerialTaskQueue>());
    }

    return SharedResourcesAcquirer(std::move(queues));
  }

createAcquirerForSourceDelayedReader()

std::pair< SharedResourcesAcquirer, std::shared_ptr< std::recursive_mutex > > SharedResourcesRegistry::createAcquirerForSourceDelayedReader

(

)

Definition at line 64 of file SharedResourcesRegistry.cc.

References edm::get_underlying(), eostools::move(), queueForDelayedReader_, and resourceForDelayedReader_.

Referenced by edm::DelayedReaderThrowingSource::DelayedReaderThrowingSource(), edm::PoolSource::PoolSource(), and edm::RootDelayedReader::RootDelayedReader().

                                                                {
    if (not resourceForDelayedReader_) {
      resourceForDelayedReader_ =
          std::make_shared<std::recursive_mutex>();  // propagate_const<T> has no reset() function
      queueForDelayedReader_ = std::make_shared<SerialTaskQueue>();
    }

    std::vector<std::shared_ptr<SerialTaskQueue>> queues = {get_underlying(queueForDelayedReader_)};
    return std::make_pair(SharedResourcesAcquirer(std::move(queues)), get_underlying(resourceForDelayedReader_));
  }

instance()

SharedResourcesRegistry * SharedResourcesRegistry::instance ( )

static

Definition at line 25 of file SharedResourcesRegistry.cc.

Referenced by edm::one::impl::SharedResourcesUser< T >::createAcquirer(), edm::DelayedReaderThrowingSource::DelayedReaderThrowingSource(), edm::PoolSource::PoolSource(), edm::RootDelayedReader::RootDelayedReader(), edm::ESProducer::updateLookup(), edm::one::impl::SharedResourcesUser< T >::usesResource(), and edm::ESProducer::usesResources().

                                                             {
    static SharedResourcesRegistry s_instance;
    return &s_instance;
  }

operator=()

const SharedResourcesRegistry& edm::SharedResourcesRegistry::operator= ( const SharedResourcesRegistry &  )

delete

registerSharedResource()

void SharedResourcesRegistry::registerSharedResource

(

const std::string &

resourceName

)

A resource name must be registered before it can be used in the createAcquirer call.

Definition at line 32 of file SharedResourcesRegistry.cc.

References kLegacyModuleResourceName, nLegacy_, resourceMap_, and mitigatedMETSequence_cff::U.

Referenced by edm::one::impl::SharedResourcesUser< T >::usesResource().

                                                                                    {
    auto& queueAndCounter = resourceMap_[resourceName];

    if (resourceName == kLegacyModuleResourceName) {
      ++nLegacy_;
      for (auto& resource : resourceMap_) {
        if (!resource.second.first) {
          resource.second.first = std::make_shared<SerialTaskQueue>();
        }
        ++resource.second.second;
      }
    } else {
      // count the number of times the resource was registered
      ++queueAndCounter.second;

      // When first registering a nonlegacy resource, we have to
      // account for any legacy resource registrations already made.
      if (queueAndCounter.second == 1) {
        if (nLegacy_ > 0U) {
          queueAndCounter.first = std::make_shared<SerialTaskQueue>();
          queueAndCounter.second += nLegacy_;
        }
        // If registering a nonlegacy resource the second time and
        // the legacy resource has not been registered yet,
        // we know we will need the queue so go ahead and create it.
      } else if (queueAndCounter.second == 2) {
        queueAndCounter.first = std::make_shared<SerialTaskQueue>();
      }
    }
  }

Friends And Related Function Documentation

::testSharedResourcesRegistry

friend class ::testSharedResourcesRegistry

friend

Definition at line 42 of file SharedResourcesRegistry.h.

Member Data Documentation

kLegacyModuleResourceName

const std::string SharedResourcesRegistry::kLegacyModuleResourceName {"__legacy__"}

static

All legacy modules share this resource.

Definition at line 56 of file SharedResourcesRegistry.h.

Referenced by createAcquirer(), registerSharedResource(), and edm::one::impl::SharedResourcesUser< T >::usesResource().

nLegacy_

unsigned int edm::SharedResourcesRegistry::nLegacy_

private

Definition at line 80 of file SharedResourcesRegistry.h.

Referenced by registerSharedResource().

queueForDelayedReader_

edm::propagate_const<std::shared_ptr<SerialTaskQueue> > edm::SharedResourcesRegistry::queueForDelayedReader_

private

Definition at line 78 of file SharedResourcesRegistry.h.

Referenced by createAcquirerForSourceDelayedReader().

resourceForDelayedReader_

edm::propagate_const<std::shared_ptr<std::recursive_mutex> > edm::SharedResourcesRegistry::resourceForDelayedReader_

private

Definition at line 76 of file SharedResourcesRegistry.h.

Referenced by createAcquirerForSourceDelayedReader().

resourceMap_

std::map<std::string, std::pair<std::shared_ptr<SerialTaskQueue>, unsigned int> > edm::SharedResourcesRegistry::resourceMap_

private

Definition at line 74 of file SharedResourcesRegistry.h.

Referenced by createAcquirer(), and registerSharedResource().