00001 #define TRACE_NAME "SharedMemoryManager"
00002 #include <cstring>
00003 #include <unordered_map>
00004 #include <set>
00005 #include <sys/ipc.h>
00006 #include <sys/shm.h>
00007 #ifndef SHM_DEST // Lynn reports that this is missing on Mac OS X?!?
00008 #define SHM_DEST 01000
00009 #endif
00010 #include "tracemf.h"
00011 #include <signal.h>
00012 #include "cetlib_except/exception.h"
00013 #include "artdaq-core/Core/SharedMemoryManager.hh"
00014 #include "artdaq-core/Utilities/TraceLock.hh"
00015
00016 #define TLVL_DETACH 11
00017 #define TLVL_BUFFER 40
00018 #define TLVL_BUFLCK 41
00019
00020 static std::set<artdaq::SharedMemoryManager const*> instances = std::set<artdaq::SharedMemoryManager const*>();
00021
00022 static std::unordered_map<int, struct sigaction> old_actions = std::unordered_map<int, struct sigaction>();
00023 static bool sighandler_init = false;
00024 static void signal_handler(int signum)
00025 {
00026
00027 TRACE_STREAMER(TLVL_ERROR, &("SharedMemoryManager")[0], 0, 0, 0) << "A signal of type " << signum << " was caught by SharedMemoryManager. Detaching all Shared Memory segments, then proceeding with default handlers!";
00028 for (auto ii : instances)
00029 {
00030 if (ii)
00031 {
00032 const_cast<artdaq::SharedMemoryManager*>(ii)->Detach(false, "", ""
00033 , false
00034
00035 );
00036 }
00037 ii = nullptr;
00038 }
00039
00040 sigset_t set;
00041 pthread_sigmask(SIG_UNBLOCK, NULL, &set);
00042 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
00043
00044 TRACE_STREAMER(TLVL_ERROR, &("SharedMemoryManager")[0], 0, 0, 0) << "Calling default signal handler";
00045 if (signum != SIGUSR2)
00046 {
00047 sigaction(signum, &old_actions[signum], NULL);
00048 kill(getpid(), signum);
00049 }
00050 else
00051 {
00052
00053 sigaction(SIGINT, &old_actions[SIGINT], NULL);
00054 kill(getpid(), SIGINT);
00055 }
00056 }
00057
00058 artdaq::SharedMemoryManager::SharedMemoryManager(uint32_t shm_key, size_t buffer_count, size_t buffer_size, uint64_t buffer_timeout_us, bool destructive_read_mode)
00059 : shm_segment_id_(-1)
00060 , shm_ptr_(NULL)
00061 , shm_key_(shm_key)
00062 , manager_id_(-1)
00063 , buffer_mutexes_()
00064 , last_seen_id_(0)
00065 {
00066 requested_shm_parameters_.buffer_count = buffer_count;
00067 requested_shm_parameters_.buffer_size = buffer_size;
00068 requested_shm_parameters_.buffer_timeout_us = buffer_timeout_us;
00069 requested_shm_parameters_.destructive_read_mode = destructive_read_mode;
00070
00071 instances.insert(this);
00072 Attach();
00073
00074 static std::mutex sighandler_mutex;
00075 std::unique_lock<std::mutex> lk(sighandler_mutex);
00076
00077 if (!sighandler_init)
00078 {
00079 sighandler_init = true;
00080 std::vector<int> signals = { SIGINT, SIGILL, SIGABRT, SIGFPE, SIGSEGV, SIGPIPE, SIGALRM, SIGTERM, SIGUSR2 };
00081 for (auto signal : signals)
00082 {
00083 struct sigaction old_action;
00084 sigaction(signal, NULL, &old_action);
00085
00086
00087
00088 if (old_action.sa_handler != SIG_IGN)
00089 {
00090 struct sigaction action;
00091 action.sa_handler = signal_handler;
00092 sigemptyset(&action.sa_mask);
00093 for (auto sigblk : signals)
00094 {
00095 sigaddset(&action.sa_mask, sigblk);
00096 }
00097 action.sa_flags = 0;
00098
00099
00100 sigaction(signal, &action, NULL);
00101 old_actions[signal] = old_action;
00102 }
00103 }
00104 }
00105 }
00106
00107 artdaq::SharedMemoryManager::~SharedMemoryManager() noexcept
00108 {
00109 instances.erase(this);
00110 TLOG(TLVL_DEBUG) << "~SharedMemoryManager called";
00111 Detach();
00112 TLOG(TLVL_DEBUG) << "~SharedMemoryManager done";
00113 }
00114
00115 void artdaq::SharedMemoryManager::Attach()
00116 {
00117 if (IsValid())
00118 {
00119 if (manager_id_ == 0) return;
00120 Detach();
00121 }
00122 auto start_time = std::chrono::steady_clock::now();
00123 last_seen_id_ = 0;
00124 size_t shmSize = requested_shm_parameters_.buffer_count * (requested_shm_parameters_.buffer_size + sizeof(ShmBuffer)) + sizeof(ShmStruct);
00125
00126 shm_segment_id_ = shmget(shm_key_, shmSize, 0666);
00127 if (shm_segment_id_ == -1 && requested_shm_parameters_.buffer_count > 0 && manager_id_ <= 0)
00128 {
00129 TLOG(TLVL_DEBUG) << "Creating shared memory segment with key 0x" << std::hex << shm_key_ << " and size " << std::dec << shmSize;
00130 shm_segment_id_ = shmget(shm_key_, shmSize, IPC_CREAT | 0666);
00131 manager_id_ = 0;
00132
00133 if (shm_segment_id_ == -1)
00134 {
00135 TLOG(TLVL_ERROR) << "Error creating shared memory segment with key 0x" << std::hex << shm_key_ << ", errno=" << errno << " (" << strerror(errno) << ")";
00136 }
00137 }
00138 else
00139 {
00140 while (shm_segment_id_ == -1 && TimeUtils::GetElapsedTimeMilliseconds(start_time) < 1000)
00141 {
00142 shm_segment_id_ = shmget(shm_key_, shmSize, 0666);
00143
00144 }
00145 }
00146 TLOG(TLVL_DEBUG) << "shm_key == 0x" << std::hex << shm_key_ << ", shm_segment_id == " << shm_segment_id_;
00147
00148 if (shm_segment_id_ > -1)
00149 {
00150 TLOG(TLVL_DEBUG)
00151 << "Attached to shared memory segment with ID = " << shm_segment_id_
00152 << " and size " << shmSize
00153 << " bytes";
00154 shm_ptr_ = (ShmStruct*)shmat(shm_segment_id_, 0, 0);
00155 TLOG(TLVL_DEBUG)
00156 << "Attached to shared memory segment at address "
00157 << std::hex << (void*)shm_ptr_ << std::dec;
00158 if (shm_ptr_ && shm_ptr_ != (void *)-1)
00159 {
00160 if (manager_id_ == 0)
00161 {
00162 if (shm_ptr_->ready_magic == 0xCAFE1111)
00163 {
00164 TLOG(TLVL_ERROR) << "Owner encountered already-initialized Shared Memory!";
00165 exit(-2);
00166 }
00167 TLOG(TLVL_DEBUG) << "Owner initializing Shared Memory";
00168 shm_ptr_->next_id = 1;
00169 shm_ptr_->next_sequence_id = 0;
00170 shm_ptr_->reader_pos = 0;
00171 shm_ptr_->writer_pos = 0;
00172 shm_ptr_->buffer_size = requested_shm_parameters_.buffer_size;
00173 shm_ptr_->buffer_count = requested_shm_parameters_.buffer_count;
00174 shm_ptr_->buffer_timeout_us = requested_shm_parameters_.buffer_timeout_us;
00175 shm_ptr_->destructive_read_mode = requested_shm_parameters_.destructive_read_mode;
00176
00177 for (int ii = 0; ii < static_cast<int>(requested_shm_parameters_.buffer_count); ++ii)
00178 {
00179 if (!getBufferInfo_(ii)) return;
00180 getBufferInfo_(ii)->writePos = 0;
00181 getBufferInfo_(ii)->readPos = 0;
00182 getBufferInfo_(ii)->sem = BufferSemaphoreFlags::Empty;
00183 getBufferInfo_(ii)->sem_id = -1;
00184 getBufferInfo_(ii)->last_touch_time = TimeUtils::gettimeofday_us();
00185 }
00186
00187 shm_ptr_->ready_magic = 0xCAFE1111;
00188 }
00189 else
00190 {
00191 TLOG(TLVL_DEBUG) << "Waiting for owner to initalize Shared Memory";
00192 while (shm_ptr_->ready_magic != 0xCAFE1111) { usleep(1000); }
00193 TLOG(TLVL_DEBUG) << "Getting ID from Shared Memory";
00194 GetNewId();
00195 shm_ptr_->lowest_seq_id_read = 0;
00196 TLOG(TLVL_DEBUG) << "Getting Shared Memory Size parameters";
00197 }
00198
00199 buffer_mutexes_ = std::vector<std::mutex>(shm_ptr_->buffer_count);
00200 TLOG(TLVL_DEBUG) << "Initialization Complete: "
00201 << "key: 0x" << std::hex << shm_key_
00202 << ", manager ID: " << std::dec << manager_id_
00203 << ", Buffer size: " << shm_ptr_->buffer_size
00204 << ", Buffer count: " << shm_ptr_->buffer_count;
00205 return;
00206 }
00207 else
00208 {
00209 TLOG(TLVL_ERROR) << "Failed to attach to shared memory segment "
00210 << shm_segment_id_;
00211 }
00212 }
00213 else
00214 {
00215 TLOG(TLVL_ERROR) << "Failed to connect to shared memory segment with key 0x" << std::hex << shm_key_
00216 << ", errno = " << strerror(errno) << ". Please check "
00217 << "if a stale shared memory segment needs to "
00218 << "be cleaned up. (ipcs, ipcrm -m <segId>)";
00219 }
00220 return;
00221 }
00222
00223 int artdaq::SharedMemoryManager::GetBufferForReading()
00224 {
00225 TLOG(13) << "GetBufferForReading BEGIN";
00226
00227 std::unique_lock<std::mutex> lk(search_mutex_);
00228
00229 auto rp = shm_ptr_->reader_pos.load();
00230
00231 TLOG(13) << "GetBufferForReading lock acquired, scanning " << shm_ptr_->buffer_count << " buffers";
00232 bool retry = true;
00233 int buffer_num = -1;
00234 while (retry)
00235 {
00236 ShmBuffer* buffer_ptr = nullptr;
00237 uint64_t seqID = -1;
00238 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00239 {
00240 auto buffer = (ii + rp) % shm_ptr_->buffer_count;
00241
00242
00243 TLOG(14) << "GetBufferForReading Checking if buffer " << buffer << " is stale. Shm destructive_read_mode="<<shm_ptr_->destructive_read_mode;
00244 ResetBuffer(buffer);
00245
00246 auto buf = getBufferInfo_(buffer);
00247 if (!buf) continue;
00248 TLOG(14) << "GetBufferForReading: Buffer " << buffer << ": sem=" << FlagToString(buf->sem)
00249 << " (expected " << FlagToString(BufferSemaphoreFlags::Full) << "), sem_id=" << buf->sem_id << ", seq_id=" << buf->sequence_id<< " )";
00250 if ( buf->sem == BufferSemaphoreFlags::Full && (buf->sem_id == -1 || buf->sem_id == manager_id_)
00251 && (shm_ptr_->destructive_read_mode || buf->sequence_id > last_seen_id_) )
00252 {
00253 if (buf->sequence_id < seqID)
00254 {
00255 buffer_ptr = buf;
00256 seqID = buf->sequence_id;
00257 buffer_num = buffer;
00258 touchBuffer_(buf);
00259 if (shm_ptr_->destructive_read_mode || seqID == last_seen_id_ + 1) break;
00260 }
00261 }
00262 }
00263
00264 if (!buffer_ptr || (buffer_ptr && buffer_ptr->sem_id != -1 && buffer_ptr->sem_id != manager_id_))
00265 {
00266 continue;
00267 }
00268
00269 if (buffer_num >= 0)
00270 {
00271 TLOG(13) << "GetBufferForReading Found buffer " << buffer_num;
00272 buffer_ptr->sem_id = manager_id_;
00273 buffer_ptr->sem = BufferSemaphoreFlags::Reading;
00274 if (buffer_ptr->sem_id != manager_id_) {
00275 TLOG(13) << "GetBufferForReading: Failed to acquire buffer " << buffer_num << " (someone else changed manager ID while I was changing sem)";
00276 continue;
00277 }
00278 buffer_ptr->readPos = 0;
00279 touchBuffer_(buffer_ptr);
00280 if (buffer_ptr->sem_id != manager_id_) {
00281 TLOG(13) << "GetBufferForReading: Failed to acquire buffer " << buffer_num << " (someone else changed manager ID while I was touching buffer SHOULD NOT HAPPEN!)";
00282 continue;
00283 }
00284 if (shm_ptr_->destructive_read_mode && shm_ptr_->lowest_seq_id_read == last_seen_id_)
00285 {
00286 shm_ptr_->lowest_seq_id_read = seqID;
00287 }
00288 last_seen_id_ = seqID;
00289 if (shm_ptr_->destructive_read_mode) shm_ptr_->reader_pos = (buffer_num + 1) % shm_ptr_->buffer_count;
00290
00291 TLOG(13) << "GetBufferForReading returning " << buffer_num;
00292 return buffer_num;
00293 }
00294 retry = false;
00295 }
00296
00297 if(buffer_num==-1) TLOG(13) << "GetBufferForReading returning -1 because no buffers are ready";
00298 else TLOG(13) << "GetBufferForReading returning with buffer " << buffer_num;
00299 return buffer_num;
00300 }
00301
00302 int artdaq::SharedMemoryManager::GetBufferForWriting(bool overwrite)
00303 {
00304 TLOG(14) << "GetBufferForWriting BEGIN";
00305 std::unique_lock<std::mutex> lk(search_mutex_);
00306
00307 auto wp = shm_ptr_->writer_pos.load();
00308
00309 TLOG(13) << "GetBufferForWriting lock acquired, scanning " << shm_ptr_->buffer_count << " buffers";
00310
00311
00312 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00313 {
00314 auto buffer = (ii + wp) % shm_ptr_->buffer_count;
00315
00316 ResetBuffer(buffer);
00317
00318 auto buf = getBufferInfo_(buffer);
00319 if (!buf) continue;
00320 if (buf->sem == BufferSemaphoreFlags::Empty && buf->sem_id == -1)
00321 {
00322 buf->sem_id = manager_id_;
00323 buf->sem = BufferSemaphoreFlags::Writing;
00324 touchBuffer_(buf);
00325 shm_ptr_->writer_pos = (buffer + 1) % shm_ptr_->buffer_count;
00326 if (buf->sem_id != manager_id_) continue;
00327 buf->sequence_id = ++shm_ptr_->next_sequence_id;
00328 buf->writePos = 0;
00329 TLOG(14) << "GetBufferForWriting returning " << buffer;
00330 return buffer;
00331 }
00332 }
00333
00334 if (overwrite)
00335 {
00336
00337 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00338 {
00339 auto buffer = (ii + wp) % shm_ptr_->buffer_count;
00340
00341 ResetBuffer(buffer);
00342
00343 auto buf = getBufferInfo_(buffer);
00344 if (!buf) continue;
00345 if (buf->sem == BufferSemaphoreFlags::Full)
00346 {
00347 buf->sem_id = manager_id_;
00348 buf->sem = BufferSemaphoreFlags::Writing;
00349 if (buf->sem_id != manager_id_) continue;
00350 buf->sequence_id = ++shm_ptr_->next_sequence_id;
00351 buf->writePos = 0;
00352 shm_ptr_->writer_pos = (buffer + 1) % shm_ptr_->buffer_count;
00353 touchBuffer_(buf);
00354 TLOG(14) << "GetBufferForWriting returning " << buffer;
00355 return buffer;
00356 }
00357 }
00358
00359
00360 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00361 {
00362 auto buffer = (ii + wp) % shm_ptr_->buffer_count;
00363
00364 ResetBuffer(buffer);
00365
00366 auto buf = getBufferInfo_(buffer);
00367 if (!buf) continue;
00368 if (buf->sem == BufferSemaphoreFlags::Reading)
00369 {
00370 buf->sem_id = manager_id_;
00371 buf->sem = BufferSemaphoreFlags::Writing;
00372 if (buf->sem_id != manager_id_) continue;
00373 buf->sequence_id = ++shm_ptr_->next_sequence_id;
00374 buf->writePos = 0;
00375 shm_ptr_->writer_pos = (buffer + 1) % shm_ptr_->buffer_count;
00376 TLOG(14) << "GetBufferForWriting returning " << buffer;
00377 touchBuffer_(buf);
00378 return buffer;
00379 }
00380 }
00381 }
00382
00383 TLOG(14) << "GetBufferForWriting Returning -1 because no buffers are ready";
00384 return -1;
00385 }
00386
00387 size_t artdaq::SharedMemoryManager::ReadReadyCount()
00388 {
00389 if (!IsValid()) return 0;
00390 TLOG(23) << "0x" << std::hex << shm_key_ << " ReadReadyCount BEGIN";
00391 std::unique_lock<std::mutex> lk(search_mutex_);
00392 TLOG(23) << "ReadReadyCount lock acquired, scanning " << shm_ptr_->buffer_count << " buffers";
00393
00394 size_t count = 0;
00395 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00396 {
00397 TLOG(24) << "0x" << std::hex << shm_key_ << std::dec << " ReadReadyCount: Checking if buffer " << ii << " is stale.";
00398 ResetBuffer(ii);
00399 auto buf = getBufferInfo_(ii);
00400 if (!buf) continue;
00401 TLOG(25) << "0x" << std::hex << shm_key_ << std::dec << " ReadReadyCount: Buffer " << ii << ": sem=" << FlagToString(buf->sem) << " (expected " << FlagToString(BufferSemaphoreFlags::Full) << "), sem_id=" << buf->sem_id << " )";
00402 if (buf->sem == BufferSemaphoreFlags::Full && (buf->sem_id == -1 || buf->sem_id == manager_id_) && (shm_ptr_->destructive_read_mode || buf->sequence_id > last_seen_id_))
00403 {
00404 TLOG(26) << "0x" << std::hex << shm_key_ << std::dec << " ReadReadyCount: Buffer " << ii << " is either unowned or owned by this manager, and is marked full.";
00405 ++count;
00406 }
00407 }
00408 return count;
00409 }
00410
00411 size_t artdaq::SharedMemoryManager::WriteReadyCount(bool overwrite)
00412 {
00413 if (!IsValid()) return 0;
00414 TLOG(28) << "0x" << std::hex << shm_key_ << " ReadReadyCount BEGIN";
00415 std::unique_lock<std::mutex> lk(search_mutex_);
00416
00417 TLOG(28) << "WriteReadyCount(" << overwrite << ") lock acquired, scanning " << shm_ptr_->buffer_count << " buffers";
00418 size_t count = 0;
00419 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00420 {
00421 TLOG(29) << "0x" << std::hex << shm_key_ << std::dec << " WriteReadyCount: Checking if buffer " << ii << " is stale.";
00422 ResetBuffer(ii);
00423 auto buf = getBufferInfo_(ii);
00424 if (!buf) continue;
00425 if ((buf->sem == BufferSemaphoreFlags::Empty && buf->sem_id == -1)
00426 || (overwrite && buf->sem != BufferSemaphoreFlags::Writing))
00427 {
00428 TLOG(29) << "0x" << std::hex << shm_key_ << std::dec << " WriteReadyCount: Buffer " << ii << " is either empty or is writing and marked for overwrite.";
00429 ++count;
00430 }
00431 }
00432 return count;
00433 }
00434
00435 bool artdaq::SharedMemoryManager::ReadyForRead()
00436 {
00437 if (!IsValid()) return false;
00438 TLOG(23) << "0x" << std::hex << shm_key_ << " ReadyForRead BEGIN";
00439 std::unique_lock<std::mutex> lk(search_mutex_);
00440
00441
00442 auto rp = shm_ptr_->reader_pos.load();
00443
00444 TLOG(23) << "ReadyForRead lock acquired, scanning " << shm_ptr_->buffer_count << " buffers";
00445
00446 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00447 {
00448 auto buffer = (rp + ii) % shm_ptr_->buffer_count;
00449 TLOG(24) << "0x" << std::hex << shm_key_ << std::dec << " ReadyForRead: Checking if buffer " << buffer << " is stale.";
00450 ResetBuffer(buffer);
00451 auto buf = getBufferInfo_(buffer);
00452 if (!buf) continue;
00453 TLOG(25) << "0x" << std::hex << shm_key_ << std::dec << " ReadyForRead: Buffer " << buffer << ": sem=" << FlagToString(buf->sem) << " (expected " << FlagToString(BufferSemaphoreFlags::Full) << "), sem_id=" << buf->sem_id << " )" << " seq_id=" << buf->sequence_id << " >? " << last_seen_id_;
00454 if (buf->sem == BufferSemaphoreFlags::Full && (buf->sem_id == -1 || buf->sem_id == manager_id_) && (shm_ptr_->destructive_read_mode || buf->sequence_id > last_seen_id_))
00455 {
00456 TLOG(26) << "0x" << std::hex << shm_key_ << std::dec << " ReadyForRead: Buffer " << buffer << " is either unowned or owned by this manager, and is marked full.";
00457 return true;
00458 }
00459 }
00460 return false;
00461 }
00462
00463 bool artdaq::SharedMemoryManager::ReadyForWrite(bool overwrite)
00464 {
00465 if (!IsValid()) return false;
00466 TLOG(28) << "0x" << std::hex << shm_key_ << " ReadyForWrite BEGIN";
00467
00468 std::unique_lock<std::mutex> lk(search_mutex_);
00469
00470
00471 auto wp = shm_ptr_->writer_pos.load();
00472
00473 TLOG(28) << "ReadyForWrite lock acquired, scanning " << shm_ptr_->buffer_count << " buffers";
00474
00475 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00476 {
00477 auto buffer = (wp + ii) % shm_ptr_->buffer_count;
00478 TLOG(29) << "0x" << std::hex << shm_key_ << std::dec << " ReadyForWrite: Checking if buffer " << buffer << " is stale.";
00479 ResetBuffer(buffer);
00480 auto buf = getBufferInfo_(buffer);
00481 if (!buf) continue;
00482 if ((buf->sem == BufferSemaphoreFlags::Empty && buf->sem_id == -1)
00483 || (overwrite && buf->sem != BufferSemaphoreFlags::Writing))
00484 {
00485 TLOG(29) << "0x" << std::hex << shm_key_
00486 << std::dec
00487 << " WriteReadyCount: Buffer " << ii << " is either empty or is writing and marked for overwrite.";
00488 return true;
00489 }
00490 }
00491 return false;
00492 }
00493
00494 std::deque<int> artdaq::SharedMemoryManager::GetBuffersOwnedByManager(bool locked)
00495 {
00496 std::deque<int> output;
00497 if (!IsValid()) return output;
00498 TLOG(TLVL_BUFFER) << "GetBuffersOwnedByManager BEGIN. Locked? " << locked;
00499 if (locked)
00500 {
00501 TLOG(TLVL_BUFLCK) << "GetBuffersOwnedByManager obtaining search_mutex";
00502 std::unique_lock<std::mutex> lk(search_mutex_);
00503 TLOG(TLVL_BUFLCK) << "GetBuffersOwnedByManager obtained search_mutex";
00504
00505 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00506 {
00507 auto buf = getBufferInfo_(ii);
00508 if (!buf) continue;
00509 if (buf->sem_id == manager_id_)
00510 {
00511 output.push_back(ii);
00512 }
00513 }
00514 }
00515 else
00516 {
00517 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00518 {
00519 auto buf = getBufferInfo_(ii);
00520 if (!buf) continue;
00521 if (buf->sem_id == manager_id_)
00522 {
00523 output.push_back(ii);
00524 }
00525 }
00526 }
00527
00528 TLOG(TLVL_BUFFER) << "GetBuffersOwnedByManager: own " << output.size() << " / " << shm_ptr_->buffer_count << " buffers.";
00529 return output;
00530 }
00531
00532 size_t artdaq::SharedMemoryManager::BufferDataSize(int buffer)
00533 {
00534 TLOG(TLVL_BUFFER) << "BufferDataSize(" << buffer << ") called.";
00535
00536 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00537
00538 TLOG(TLVL_BUFLCK) << "BufferDataSize obtaining buffer_mutex for buffer " << buffer;
00539 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00540 TLOG(TLVL_BUFLCK) << "BufferDataSize obtained buffer_mutex for buffer " << buffer;
00541
00542
00543 auto buf = getBufferInfo_(buffer);
00544 if (!buf) return 0;
00545 touchBuffer_(buf);
00546
00547 TLOG(TLVL_BUFFER) << "BufferDataSize: buffer " << buffer << ", size=" << buf->writePos;
00548 return buf->writePos;
00549 }
00550
00551
00552 void artdaq::SharedMemoryManager::ResetReadPos(int buffer)
00553 {
00554 TLOG(15) << "ResetReadPos(" << buffer << ") called.";
00555
00556 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00557
00558 TLOG(TLVL_BUFLCK) << "ResetReadPos obtaining buffer_mutex for buffer " << buffer;
00559 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00560 TLOG(TLVL_BUFLCK) << "ResetReadPos obtained buffer_mutex for buffer " << buffer;
00561
00562
00563 auto buf = getBufferInfo_(buffer);
00564 if (!buf) return;
00565 touchBuffer_(buf);
00566 buf->readPos = 0;
00567
00568 TLOG(15) << "ResetReadPos(" << buffer << ") ended.";
00569 }
00570
00571 void artdaq::SharedMemoryManager::ResetWritePos(int buffer)
00572 {
00573 TLOG(16) << "ResetWritePos(" << buffer << ") called.";
00574
00575 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00576
00577 TLOG(TLVL_BUFLCK) << "ResetWritePos obtaining buffer_mutex for buffer " << buffer;
00578 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00579 TLOG(TLVL_BUFLCK) << "ResetWritePos obtained buffer_mutex for buffer " << buffer;
00580
00581
00582 auto buf = getBufferInfo_(buffer);
00583 if (!buf) return;
00584 checkBuffer_(buf, BufferSemaphoreFlags::Writing);
00585 touchBuffer_(buf);
00586 buf->writePos = 0;
00587
00588 TLOG(16) << "ResetWritePos(" << buffer << ") ended.";
00589 }
00590
00591 void artdaq::SharedMemoryManager::IncrementReadPos(int buffer, size_t read)
00592 {
00593 TLOG(15) << "IncrementReadPos called: buffer= " << buffer << ", bytes to read=" << read;
00594
00595 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00596
00597 TLOG(TLVL_BUFLCK) << "IncrementReadPos obtaining buffer_mutex for buffer " << buffer;
00598 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00599 TLOG(TLVL_BUFLCK) << "IncrementReadPos obtained buffer_mutex for buffer " << buffer;
00600
00601 auto buf = getBufferInfo_(buffer);
00602 if (!buf) return;
00603 touchBuffer_(buf);
00604 TLOG(15) << "IncrementReadPos: buffer= " << buffer << ", readPos=" << buf->readPos << ", bytes read=" << read;
00605 buf->readPos = buf->readPos + read;
00606 TLOG(15) << "IncrementReadPos: buffer= " << buffer << ", New readPos is " << buf->readPos;
00607 if (read == 0) Detach(true, "LogicError", "Cannot increment Read pos by 0! (buffer=" + std::to_string(buffer) + ", readPos=" + std::to_string(buf->readPos) + ", writePos=" + std::to_string(buf->writePos) + ")");
00608 }
00609
00610 bool artdaq::SharedMemoryManager::IncrementWritePos(int buffer, size_t written)
00611 {
00612 TLOG(16) << "IncrementWritePos called: buffer= " << buffer << ", bytes written=" << written;
00613
00614 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00615
00616 TLOG(TLVL_BUFLCK) << "IncrementWritePos obtaining buffer_mutex for buffer " << buffer;
00617 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00618 TLOG(TLVL_BUFLCK) << "IncrementWritePos obtained buffer_mutex for buffer " << buffer;
00619
00620 auto buf = getBufferInfo_(buffer);
00621 if (!buf) return false;
00622 touchBuffer_(buf);
00623 if (buf->writePos + written > shm_ptr_->buffer_size)
00624 {
00625 TLOG(TLVL_ERROR) << "Requested write size is larger than the buffer size! (sz=" << std::hex << shm_ptr_->buffer_size << ", cur + req=" << buf->writePos + written << ")";
00626 return false;
00627 }
00628 TLOG(16) << "IncrementWritePos: buffer= " << buffer << ", writePos=" << buf->writePos << ", bytes written=" << written;
00629 buf->writePos += written;
00630 TLOG(16) << "IncrementWritePos: buffer= " << buffer << ", New writePos is " << buf->writePos;
00631 if (written == 0) Detach(true, "LogicError", "Cannot increment Write pos by 0!");
00632
00633 return true;
00634 }
00635
00636 bool artdaq::SharedMemoryManager::MoreDataInBuffer(int buffer)
00637 {
00638 TLOG(17) << "MoreDataInBuffer(" << buffer << ") called.";
00639
00640 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00641
00642 TLOG(TLVL_BUFLCK) << "MoreDataInBuffer obtaining buffer_mutex for buffer " << buffer;
00643 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00644 TLOG(TLVL_BUFLCK) << "MoreDataInBuffer obtained buffer_mutex for buffer " << buffer;
00645
00646 auto buf = getBufferInfo_(buffer);
00647 if (!buf) return false;
00648 TLOG(17) << "MoreDataInBuffer: buffer= " << buffer << ", readPos=" << std::to_string(buf->readPos) << ", writePos=" << buf->writePos;
00649 return buf->readPos < buf->writePos;
00650 }
00651
00652 bool artdaq::SharedMemoryManager::CheckBuffer(int buffer, BufferSemaphoreFlags flags)
00653 {
00654 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00655
00656 TLOG(TLVL_BUFLCK) << "CheckBuffer obtaining buffer_mutex for buffer " << buffer;
00657 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00658 TLOG(TLVL_BUFLCK) << "CheckBuffer obtained buffer_mutex for buffer " << buffer;
00659
00660 return checkBuffer_(getBufferInfo_(buffer), flags, false);
00661 }
00662
00663 void artdaq::SharedMemoryManager::MarkBufferFull(int buffer, int destination)
00664 {
00665 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00666
00667 TLOG(TLVL_BUFLCK) << "MarkBufferFull obtaining buffer_mutex for buffer " << buffer;
00668 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00669 TLOG(TLVL_BUFLCK) << "MarkBufferFull obtained buffer_mutex for buffer " << buffer;
00670
00671
00672 auto shmBuf = getBufferInfo_(buffer);
00673 if (!shmBuf) return;
00674 touchBuffer_(shmBuf);
00675 if (shmBuf->sem_id == manager_id_)
00676 {
00677 if (shmBuf->sem != BufferSemaphoreFlags::Full)
00678 shmBuf->sem = BufferSemaphoreFlags::Full;
00679
00680 shmBuf->sem_id = destination;
00681 }
00682 }
00683
00684 void artdaq::SharedMemoryManager::MarkBufferEmpty(int buffer, bool force)
00685 {
00686 TLOG(18) << "MarkBufferEmpty BEGIN";
00687 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00688 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00689
00690 auto shmBuf = getBufferInfo_(buffer);
00691 if (!shmBuf) return;
00692 if (!force)
00693 {
00694 checkBuffer_(shmBuf, BufferSemaphoreFlags::Reading, true);
00695 }
00696 touchBuffer_(shmBuf);
00697
00698 shmBuf->readPos = 0;
00699 shmBuf->sem = BufferSemaphoreFlags::Full;
00700
00701 if ((force && (manager_id_ == 0 || manager_id_ == shmBuf->sem_id)) || (!force && shm_ptr_->destructive_read_mode))
00702 {
00703 TLOG(18) << "MarkBufferEmpty Resetting buffer " << buffer << " to Empty state";
00704 shmBuf->writePos = 0;
00705 shmBuf->sem = BufferSemaphoreFlags::Empty;
00706 if (shm_ptr_->reader_pos == static_cast<unsigned>(buffer) && !shm_ptr_->destructive_read_mode)
00707 {
00708 TLOG(18) << "MarkBufferEmpty Broadcast mode; incrementing reader_pos from " << shm_ptr_->reader_pos << " to " << (buffer + 1) % shm_ptr_->buffer_count;
00709 shm_ptr_->reader_pos = (buffer + 1) % shm_ptr_->buffer_count;
00710 }
00711 }
00712 shmBuf->sem_id = -1;
00713 TLOG(18) << "MarkBufferEmpty END";
00714 }
00715
00716 bool artdaq::SharedMemoryManager::ResetBuffer(int buffer)
00717 {
00718 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00719
00720 TLOG(TLVL_BUFLCK) << "ResetBuffer: obtaining buffer_mutex lock for buffer " << buffer;
00721 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00722 TLOG(TLVL_BUFLCK) << "ResetBuffer: obtained buffer_mutex lock for buffer " << buffer;
00723
00724
00725 auto shmBuf = getBufferInfo_(buffer);
00726 if (!shmBuf) return false;
00727
00728
00729
00730
00731
00732
00733
00734
00735
00736
00737 size_t delta = TimeUtils::gettimeofday_us() - shmBuf->last_touch_time;
00738 if (delta > 0xFFFFFFFF)
00739 {
00740 TLOG(TLVL_TRACE) << "Buffer has touch time in the future, setting it to current time and ignoring...";
00741 shmBuf->last_touch_time = TimeUtils::gettimeofday_us();
00742 return false;
00743 }
00744 if (shm_ptr_->buffer_timeout_us == 0 || delta <= shm_ptr_->buffer_timeout_us || shmBuf->sem == BufferSemaphoreFlags::Empty) return false;
00745 TLOG(27) << "Buffer " << buffer << " at " << (void*)shmBuf << " is stale, time=" << TimeUtils::gettimeofday_us() << ", last touch=" << shmBuf->last_touch_time << ", d=" << delta << ", timeout=" << shm_ptr_->buffer_timeout_us;
00746
00747 if (shmBuf->sem_id == manager_id_ && shmBuf->sem == BufferSemaphoreFlags::Writing)
00748 {
00749 return true;
00750 }
00751 if (!shm_ptr_->destructive_read_mode && shmBuf->sem == BufferSemaphoreFlags::Full)
00752 {
00753 TLOG(TLVL_DEBUG) << "Resetting old broadcast mode buffer " << buffer << " (seqid=" << shmBuf->sequence_id << "). State: Full-->Empty";
00754 shmBuf->writePos = 0;
00755 shmBuf->sem = BufferSemaphoreFlags::Empty;
00756 shmBuf->sem_id = -1;
00757 if (shm_ptr_->reader_pos == static_cast<unsigned>(buffer)) shm_ptr_->reader_pos = (buffer + 1) % shm_ptr_->buffer_count;
00758 return true;
00759 }
00760
00761 if (shmBuf->sem_id != manager_id_ && shmBuf->sem == BufferSemaphoreFlags::Reading)
00762 {
00763
00764 size_t delta = TimeUtils::gettimeofday_us() - shmBuf->last_touch_time;
00765 if (delta <= shm_ptr_->buffer_timeout_us) return false;
00766 TLOG(TLVL_WARNING) << "Stale Read buffer " << buffer << " at " << (void*)shmBuf
00767 << " ( " << delta << " / " << shm_ptr_->buffer_timeout_us << " us ) detected! (seqid="
00768 << shmBuf->sequence_id << ") Resetting... Reading-->Full";
00769 shmBuf->readPos = 0;
00770 shmBuf->sem = BufferSemaphoreFlags::Full;
00771 shmBuf->sem_id = -1;
00772 return true;
00773 }
00774 return false;
00775 }
00776
00777 bool artdaq::SharedMemoryManager::IsEndOfData() const
00778 {
00779 if (!IsValid()) return true;
00780
00781 struct shmid_ds info;
00782 auto sts = shmctl(shm_segment_id_, IPC_STAT, &info);
00783 if (sts < 0)
00784 {
00785 TLOG(TLVL_TRACE) << "Error accessing Shared Memory info: " << errno << " (" << strerror(errno) << ").";
00786 return true;
00787 }
00788
00789 if (info.shm_perm.mode & SHM_DEST)
00790 {
00791 TLOG(TLVL_INFO) << "Shared Memory marked for destruction. Probably an end-of-data condition!";
00792 return true;
00793 }
00794
00795 return false;
00796 }
00797
00798 uint16_t artdaq::SharedMemoryManager::GetAttachedCount() const
00799 {
00800 if (!IsValid()) return 0;
00801
00802 struct shmid_ds info;
00803 auto sts = shmctl(shm_segment_id_, IPC_STAT, &info);
00804 if (sts < 0)
00805 {
00806 TLOG(TLVL_TRACE) << "Error accessing Shared Memory info: " << errno << " (" << strerror(errno) << ").";
00807 return 0;
00808 }
00809
00810 return info.shm_nattch;
00811 }
00812
00813 size_t artdaq::SharedMemoryManager::Write(int buffer, void* data, size_t size)
00814 {
00815 TLOG(19) << "Write BEGIN";
00816 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00817 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00818
00819 auto shmBuf = getBufferInfo_(buffer);
00820 if (!shmBuf) return -1;
00821 checkBuffer_(shmBuf, BufferSemaphoreFlags::Writing);
00822 touchBuffer_(shmBuf);
00823 TLOG(19) << "Buffer Write Pos is " << shmBuf->writePos << ", write size is " << size;
00824 if (shmBuf->writePos + size > shm_ptr_->buffer_size)
00825 {
00826 TLOG(TLVL_ERROR) << "Attempted to write more data than fits into Shared Memory, bufferSize=" << shm_ptr_->buffer_size
00827 << ",writePos=" << shmBuf->writePos << ",writeSize=" << size;
00828 Detach(true, "SharedMemoryWrite", "Attempted to write more data than fits into Shared Memory! \nRe-run with a larger buffer size!");
00829 }
00830
00831 auto pos = GetWritePos(buffer);
00832 memcpy(pos, data, size);
00833 shmBuf->writePos = shmBuf->writePos + size;
00834
00835 auto last_seen = last_seen_id_.load();
00836 while (last_seen < shmBuf->sequence_id && !last_seen_id_.compare_exchange_weak(last_seen, shmBuf->sequence_id)) {}
00837
00838 TLOG(19) << "Write END";
00839 return size;
00840 }
00841
00842 bool artdaq::SharedMemoryManager::Read(int buffer, void* data, size_t size)
00843 {
00844 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00845 std::unique_lock<std::mutex> lk(buffer_mutexes_[buffer]);
00846
00847 auto shmBuf = getBufferInfo_(buffer);
00848 if (!shmBuf) return false;
00849 checkBuffer_(shmBuf, BufferSemaphoreFlags::Reading);
00850 touchBuffer_(shmBuf);
00851 if (shmBuf->readPos + size > shm_ptr_->buffer_size)
00852 {
00853 TLOG(TLVL_ERROR) << "Attempted to read more data than fits into Shared Memory, bufferSize=" << shm_ptr_->buffer_size
00854 << ",readPos=" << shmBuf->readPos << ",readSize=" << size;
00855 Detach(true, "SharedMemoryRead", "Attempted to read more data than exists in Shared Memory!");
00856 }
00857
00858 auto pos = GetReadPos(buffer);
00859 memcpy(data, pos, size);
00860 shmBuf->readPos += size;
00861 touchBuffer_(shmBuf);
00862 return checkBuffer_(shmBuf, BufferSemaphoreFlags::Reading, false);
00863 }
00864
00865 std::string artdaq::SharedMemoryManager::toString()
00866 {
00867 std::ostringstream ostr;
00868 ostr << "ShmStruct: " << std::endl
00869 << "Reader Position: " << shm_ptr_->reader_pos << std::endl
00870 << "Writer Position: " << shm_ptr_->writer_pos << std::endl
00871 << "Next ID Number: " << shm_ptr_->next_id << std::endl
00872 << "Buffer Count: " << shm_ptr_->buffer_count << std::endl
00873 << "Buffer Size: " << std::to_string(shm_ptr_->buffer_size) << " bytes" << std::endl
00874 << "Buffers Written: " << std::to_string(shm_ptr_->next_sequence_id) << std::endl
00875 << "Rank of Writer: " << shm_ptr_->rank << std::endl
00876 << "Ready Magic Bytes: 0x" << std::hex << shm_ptr_->ready_magic << std::endl << std::endl;
00877
00878 for (auto ii = 0; ii < shm_ptr_->buffer_count; ++ii)
00879 {
00880 auto buf = getBufferInfo_(ii);
00881 if (!buf) continue;
00882
00883 ostr << "ShmBuffer " << std::dec << ii << std::endl
00884 << "sequenceID: " << std::to_string(buf->sequence_id) << std::endl
00885 << "writePos: " << std::to_string(buf->writePos) << std::endl
00886 << "readPos: " << std::to_string(buf->readPos) << std::endl
00887 << "sem: " << FlagToString(buf->sem) << std::endl
00888 << "Owner: " << std::to_string(buf->sem_id.load()) << std::endl
00889 << "Last Touch Time: " << std::to_string(buf->last_touch_time / 1000000.0) << std::endl << std::endl;
00890 }
00891
00892 return ostr.str();
00893 }
00894
00895 void* artdaq::SharedMemoryManager::GetReadPos(int buffer)
00896 {
00897 auto buf = getBufferInfo_(buffer);
00898 if (!buf) return nullptr;
00899 return bufferStart_(buffer) + buf->readPos;
00900 }
00901 void* artdaq::SharedMemoryManager::GetWritePos(int buffer)
00902 {
00903 auto buf = getBufferInfo_(buffer);
00904 if (!buf) return nullptr;
00905 return bufferStart_(buffer) + buf->writePos;
00906 }
00907
00908 void* artdaq::SharedMemoryManager::GetBufferStart(int buffer)
00909 {
00910 return bufferStart_(buffer);
00911 }
00912
00913 std::list<std::pair<int, artdaq::SharedMemoryManager::BufferSemaphoreFlags>> artdaq::SharedMemoryManager::GetBufferReport()
00914 {
00915 auto output = std::list<std::pair<int, BufferSemaphoreFlags>>();
00916 for (size_t ii = 0; ii < size(); ++ii)
00917 {
00918 auto buf = getBufferInfo_(ii);
00919 output.emplace_back(std::make_pair(buf->sem_id.load(), buf->sem.load()));
00920 }
00921 return output;
00922 }
00923
00924 uint8_t* artdaq::SharedMemoryManager::dataStart_() const
00925 {
00926 if (shm_ptr_ == nullptr) return nullptr;
00927 return reinterpret_cast<uint8_t*>(shm_ptr_ + 1) + shm_ptr_->buffer_count * sizeof(ShmBuffer);
00928 }
00929
00930 uint8_t* artdaq::SharedMemoryManager::bufferStart_(int buffer)
00931 {
00932 if (shm_ptr_ == nullptr) return nullptr;
00933 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00934 return dataStart_() + buffer * shm_ptr_->buffer_size;
00935 }
00936
00937 artdaq::SharedMemoryManager::ShmBuffer* artdaq::SharedMemoryManager::getBufferInfo_(int buffer)
00938 {
00939 if (shm_ptr_ == nullptr) return nullptr;
00940 if (buffer >= shm_ptr_->buffer_count) Detach(true, "ArgumentOutOfRange", "The specified buffer does not exist!");
00941 return reinterpret_cast<ShmBuffer*>(reinterpret_cast<uint8_t*>(shm_ptr_ + 1) + buffer * sizeof(ShmBuffer));
00942 }
00943
00944 bool artdaq::SharedMemoryManager::checkBuffer_(ShmBuffer* buffer, BufferSemaphoreFlags flags, bool exceptions)
00945 {
00946 if (!buffer)
00947 {
00948 if (exceptions)
00949 {
00950 Detach(true, "BufferNotThereException", "Request to check buffer that does not exist!");
00951 }
00952 return false;
00953 }
00954 TLOG(TLVL_TRACE) << "checkBuffer_: Checking that buffer " << buffer->sequence_id << " has sem_id " << manager_id_ << " (Current: " << buffer->sem_id << ") and is in state " << FlagToString(flags) << " (current: " << FlagToString(buffer->sem) << ")";
00955 if (exceptions)
00956 {
00957 if (buffer->sem != flags) Detach(true, "StateAccessViolation", "Shared Memory buffer is not in the correct state! (expected " + FlagToString(flags) + ", actual " + FlagToString(buffer->sem) + ")");
00958 if (buffer->sem_id != manager_id_) Detach(true, "OwnerAccessViolation", "Shared Memory buffer is not owned by this manager instance! (Expected: " + std::to_string(manager_id_) + ", Actual: " + std::to_string(buffer->sem_id) + ")");
00959 }
00960 bool ret = (buffer->sem_id == manager_id_ || (buffer->sem_id == -1 && (flags == BufferSemaphoreFlags::Full || flags == BufferSemaphoreFlags::Empty))) && buffer->sem == flags;
00961
00962 if (!ret)
00963 {
00964 TLOG(TLVL_WARNING) << "CheckBuffer detected issue with buffer " << buffer->sequence_id << "!"
00965 << " ID: " << buffer->sem_id << " (" << manager_id_ << "), Flag: " << FlagToString(buffer->sem) << " (" << FlagToString(flags) << "). "
00966 << "ID -1 is okay if desired flag is \"Full\" or \"Empty\".";
00967 }
00968
00969 return ret;
00970 }
00971
00972 void artdaq::SharedMemoryManager::touchBuffer_(ShmBuffer* buffer)
00973 {
00974 if (buffer->sem_id != -1 && buffer->sem_id != manager_id_) return;
00975 TLOG(TLVL_TRACE) << "touchBuffer_: Touching buffer at " << (void*)buffer << " with sequence_id " << buffer->sequence_id;
00976 buffer->last_touch_time = TimeUtils::gettimeofday_us();
00977 }
00978
00979 void artdaq::SharedMemoryManager::Detach(bool throwException, std::string category, std::string message, bool force)
00980 {
00981 TLOG(TLVL_DETACH) << "Detach BEGIN: throwException: " << std::boolalpha << throwException << ", force: " << force;
00982 if (IsValid())
00983 {
00984 TLOG(TLVL_DETACH) << "Detach: Resetting owned buffers";
00985 auto bufs = GetBuffersOwnedByManager(false);
00986 for (auto buf : bufs)
00987 {
00988 auto shmBuf = getBufferInfo_(buf);
00989 if (!shmBuf) continue;
00990 if (shmBuf->sem == BufferSemaphoreFlags::Writing)
00991 {
00992 shmBuf->sem = BufferSemaphoreFlags::Empty;
00993 }
00994 else if (shmBuf->sem == BufferSemaphoreFlags::Reading)
00995 {
00996 shmBuf->sem = BufferSemaphoreFlags::Full;
00997 }
00998 shmBuf->sem_id = -1;
00999 }
01000 }
01001
01002 if (shm_ptr_)
01003 {
01004 TLOG(TLVL_DETACH) << "Detach: Detaching shared memory";
01005 shmdt(shm_ptr_);
01006 shm_ptr_ = NULL;
01007 }
01008
01009 if ((force || manager_id_ == 0) && shm_segment_id_ > -1)
01010 {
01011 TLOG(TLVL_DETACH) << "Detach: Marking Shared memory for removal";
01012 shmctl(shm_segment_id_, IPC_RMID, NULL);
01013 shm_segment_id_ = -1;
01014 }
01015
01016 if (category.size() > 0 && message.size() > 0)
01017 {
01018 TLOG(TLVL_ERROR) << category << ": " << message;
01019
01020 if (throwException)
01021 {
01022 throw cet::exception(category) << message;
01023 }
01024 }
01025 }
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01027
01028
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01031