mirror of
https://github.com/FairRootGroup/FairMQ.git
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96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
/********************************************************************************
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* Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH *
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* *
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* This software is distributed under the terms of the *
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* GNU Lesser General Public Licence (LGPL) version 3, *
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* copied verbatim in the file "LICENSE" *
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********************************************************************************/
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#ifndef FAIR_MQ_SHMEM_COMMON_H_
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#define FAIR_MQ_SHMEM_COMMON_H_
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#include <atomic>
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#include <string>
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/functional/hash.hpp>
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#include <unistd.h>
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#include <sys/types.h>
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namespace fair
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{
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namespace mq
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{
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namespace shmem
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{
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struct DeviceCounter
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{
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DeviceCounter(unsigned int c)
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: fCount(c)
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{}
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std::atomic<unsigned int> fCount;
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};
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struct RegionCounter
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{
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RegionCounter(unsigned int c)
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: fCount(c)
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{}
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std::atomic<unsigned int> fCount;
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};
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struct MonitorStatus
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{
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MonitorStatus()
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: fActive(true)
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{}
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bool fActive;
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};
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struct MetaHeader
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{
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size_t fSize;
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size_t fRegionId;
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boost::interprocess::managed_shared_memory::handle_t fHandle;
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size_t fHint;
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};
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struct RegionBlock
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{
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RegionBlock()
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: fHandle()
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, fSize(0)
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, fHint(0)
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{}
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RegionBlock(boost::interprocess::managed_shared_memory::handle_t handle, size_t size, size_t hint)
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: fHandle(handle)
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, fSize(size)
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, fHint(hint)
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{}
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boost::interprocess::managed_shared_memory::handle_t fHandle;
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size_t fSize;
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size_t fHint;
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};
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// find id for unique shmem name:
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// a hash of user id + session id, truncated to 8 characters (to accommodate for name size limit on some systems (MacOS)).
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inline std::string buildShmIdFromSessionIdAndUserId(const std::string& sessionId)
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{
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boost::hash<std::string> stringHash;
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std::string shmId(std::to_string(stringHash(std::string((std::to_string(geteuid()) + sessionId)))));
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shmId.resize(8, '_');
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return shmId;
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}
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} // namespace shmem
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} // namespace mq
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} // namespace fair
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#endif /* FAIR_MQ_SHMEM_COMMON_H_ */
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