2 #define TRACE_NAME "SharedMemoryEventReceiver"
4 #include "artdaq-core/Core/SharedMemoryEventReceiver.hh"
5 #include "artdaq-core/Data/Fragment.hh"
11 : current_read_buffer_(-1)
13 , current_header_(nullptr)
14 , current_data_source_(nullptr)
16 , broadcasts_(broadcast_shm_key)
18 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"SharedMemoryEventReceiver CONSTRUCTOR" << TLOG_ENDL;
23 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"ReadyForRead BEGIN" << TLOG_ENDL;
24 if (current_read_buffer_ != -1 && current_data_source_ && current_header_)
26 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"ReadyForRead Returning true because already reading buffer" << TLOG_ENDL;
34 if (broadcasts_.ReadyForRead())
36 buf = broadcasts_.GetBufferForReading();
37 current_data_source_ = &broadcasts_;
39 else if (!broadcast && data_.ReadyForRead())
41 buf = data_.GetBufferForReading();
42 current_data_source_ = &data_;
44 if (buf != -1 && current_data_source_)
46 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"ReadyForRead Found buffer, returning true" << TLOG_ENDL;
47 current_read_buffer_ = buf;
48 current_data_source_->ResetReadPos(buf);
52 if (current_data_source_ == &broadcasts_)
55 auto types = GetFragmentTypes(err);
69 current_data_source_ =
nullptr;
71 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"ReadyForRead returning false" << TLOG_ENDL;
77 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"ReadHeader BEGIN" << TLOG_ENDL;
78 if (current_read_buffer_ != -1 && current_data_source_)
83 TLOG_WARNING(
"SharedMemoryEventReceiver") <<
"Buffer was in incorrect state, resetting" << TLOG_ENDL;
84 current_data_source_ =
nullptr;
85 current_read_buffer_ = -1;
86 current_header_ =
nullptr;
90 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"Already have buffer, returning stored header" << TLOG_ENDL;
91 return current_header_;
96 if (current_read_buffer_ == -1 || !current_header_ || !current_data_source_)
throw cet::exception(
"AccessViolation") <<
"Cannot call GetFragmentTypes when not currently reading a buffer! Call ReadHeader() first!";
99 if (err)
return std::set<Fragment::type_t>();
101 current_data_source_->ResetReadPos(current_read_buffer_);
103 auto output = std::set<Fragment::type_t>();
105 while (current_data_source_->MoreDataInBuffer(current_read_buffer_))
108 if (err)
return std::set<Fragment::type_t>();
110 output.insert(fragHdr->type);
111 current_data_source_->IncrementReadPos(current_read_buffer_, fragHdr->word_count *
sizeof(
RawDataType));
120 if (!current_data_source_ || !current_header_ || current_read_buffer_ == -1)
throw cet::exception(
"AccessViolation") <<
"Cannot call GetFragmentsByType when not currently reading a buffer! Call ReadHeader() first!";
122 if (err)
return nullptr;
124 current_data_source_->ResetReadPos(current_read_buffer_);
127 std::unique_ptr<Fragments> output(
new Fragments());
129 while (current_data_source_->MoreDataInBuffer(current_read_buffer_))
132 if (err)
return nullptr;
137 current_data_source_->Read(current_read_buffer_, output->back().headerAddress(), fragHdr->word_count *
sizeof(
RawDataType));
138 output->back().autoResize();
142 current_data_source_->IncrementReadPos(current_read_buffer_, fragHdr->word_count *
sizeof(
RawDataType));
146 return std::move(output);
149 std::string artdaq::SharedMemoryEventReceiver::printBuffers_(
SharedMemoryManager* data_source)
151 std::ostringstream ostr;
152 for (
size_t ii = 0; ii < data_source->
size(); ++ii)
154 ostr <<
"Buffer " << std::to_string(ii) <<
": " << std::endl;
162 ostr <<
" Fragment " << std::to_string(fragHdr->fragment_id) <<
": Sequence ID: " << std::to_string(fragHdr->sequence_id) <<
", Type:" << std::to_string(fragHdr->type);
163 if (fragHdr->MakeVerboseSystemTypeMap().count(fragHdr->type))
165 ostr <<
" (" << fragHdr->MakeVerboseSystemTypeMap()[fragHdr->type] <<
")";
167 ostr <<
", Size: " << std::to_string(fragHdr->word_count) <<
" words." << std::endl;
177 std::ostringstream ostr;
178 ostr << data_.toString() << std::endl;
180 ostr <<
"Data Buffer Fragment Counts: " << std::endl;
181 ostr << printBuffers_(&data_);
183 if (data_.GetKey() != broadcasts_.GetKey())
185 ostr <<
"Broadcast Buffer Fragment Counts: " << std::endl;
186 ostr << printBuffers_(&broadcasts_);
194 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"ReleaseBuffer BEGIN" << TLOG_ENDL;
197 current_data_source_->MarkBufferEmpty(current_read_buffer_);
199 catch (cet::exception e)
201 TLOG_WARNING(
"SharedMemoryEventReceiver") <<
"A cet::exception occured while trying to release the buffer: " << e << TLOG_ENDL;
205 TLOG_ERROR(
"SharedMemoryEventReceiver") <<
"An unknown exception occured while trying to release the buffer" << TLOG_ENDL;
207 current_read_buffer_ = -1;
208 current_header_ =
nullptr;
209 current_data_source_ =
nullptr;
210 TLOG_TRACE(
"SharedMemoryEventReceiver") <<
"ReleaseBuffer END" << TLOG_ENDL;
static constexpr type_t InvalidFragmentType
Copy InvalidFragmentType from RawFragmentHeader.
std::vector< Fragment > Fragments
A std::vector of Fragment objects.
void ReleaseBuffer()
Release the buffer currently being read to the Empty state.
void IncrementReadPos(int buffer, size_t read)
Increment the read position for a given buffer.
detail::RawFragmentHeader::type_t type_t
typedef for type_t from RawFragmentHeader
void ResetReadPos(int buffer)
Set the read position of the given buffer to the beginning of the buffer.
bool MoreDataInBuffer(int buffer)
Determine if more data is available to be read, based on the read position and data size...
static constexpr type_t InitFragmentType
Copy InitFragmentType from RawFragmentHeader.
The buffer is currently being read from.
The SharedMemoryManager creates a Shared Memory area which is divided into a number of fixed-size buf...
SharedMemoryEventReceiver(uint32_t shm_key, uint32_t broadcast_shm_key)
Connect to a Shared Memory segment using the given parameters.
size_t size() const
Get the number of buffers in the shared memory segment.
detail::RawFragmentHeader::RawDataType RawDataType
The RawDataType (currently a 64-bit integer) is the basic unit of data representation within artdaq ...
std::set< Fragment::type_t > GetFragmentTypes(bool &err)
Get a set of Fragment Types present in the event.
void * GetReadPos(int buffer)
Get a pointer to the current read position of the buffer.
bool ReadyForRead(bool broadcast=false, size_t timeout_us=1000000)
Determine whether an event is available for reading.
std::string toString()
Write out information about the Shared Memory to a string.
detail::RawEventHeader * ReadHeader(bool &err)
Get the Event header.
uint64_t gettimeofday_us()
Get the current time of day in microseconds (from gettimeofday system call)
std::unique_ptr< Fragments > GetFragmentsByType(bool &err, Fragment::type_t type)
Get a pointer to the Fragments of a given type in the event.