Open-Harbor/osrm-backend
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 3 Wiki Activity

Change to condvar signaling if data region swapped

Browse Source
This commit is contained in:
Michael Krasnyk
2016-12-26 01:00:37 +01:00
committed by Patrick Niklaus
parent 774b8688ca
commit fce8d72895
10 changed files with 143 additions and 362 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/engine/datafacade/shared_memory_datafacade.hpp
+4 -45
View File
@@ -25,57 +25,16 @@ class SharedMemoryDataFacade : public ContiguousInternalMemoryDataFacadeBase
protected:
std::unique_ptr<storage::SharedMemory> m_large_memory;
std::shared_ptr<storage::SharedBarriers> shared_barriers;
storage::SharedDataType data_region;
unsigned shared_timestamp;
SharedMemoryDataFacade() {}
public:
// this function handle the deallocation of the shared memory it we can prove it will not be
// used anymore. We crash hard here if something goes wrong (noexcept).
virtual ~SharedMemoryDataFacade() noexcept
SharedMemoryDataFacade(storage::SharedDataType data_region)
: data_region(data_region)
{
// Now check if this is still the newest dataset
boost::interprocess::sharable_lock<boost::interprocess::named_upgradable_mutex>
current_regions_lock(shared_barriers->current_region_mutex,
boost::interprocess::defer_lock);
boost::interprocess::scoped_lock<boost::interprocess::named_sharable_mutex> exclusive_lock(
data_region == storage::REGION_1 ? shared_barriers->region_1_mutex
: shared_barriers->region_2_mutex,
boost::interprocess::defer_lock);
// if this returns false this is still in use
if (current_regions_lock.try_lock() && exclusive_lock.try_lock())
{
if (storage::SharedMemory::RegionExists(data_region))
{
auto shared_region = storage::makeSharedMemory(storage::CURRENT_REGION);
const auto current_timestamp =
static_cast<const storage::SharedDataTimestamp *>(shared_region->Ptr());
// check if the memory region referenced by this facade needs cleanup
if (current_timestamp->region == data_region)
{
util::Log(logDEBUG) << "Retaining data with shared timestamp "
<< shared_timestamp;
}
else
{
storage::SharedMemory::Remove(data_region);
}
}
}
}
SharedMemoryDataFacade(const std::shared_ptr<storage::SharedBarriers> &shared_barriers_,
storage::SharedDataType data_region_,
unsigned shared_timestamp_)
: shared_barriers(shared_barriers_), data_region(data_region_),
shared_timestamp(shared_timestamp_)
{
util::Log(logDEBUG) << "Loading new data with shared timestamp " << shared_timestamp;
util::Log(logDEBUG) << "Loading new data for region " << regionToString(data_region);
BOOST_ASSERT(storage::SharedMemory::RegionExists(data_region));
m_large_memory = storage::makeSharedMemory(data_region);