monitor/src/program/ZoneReader.cpp

   1 /**
   2         Aesalon, a tool to visualize a program's behaviour at run-time.
   3         Copyright (C) 2010, Aesalon Development Team.
   4
   5         Aesalon is distributed under the terms of the GNU GPLv3. For more
   6         licensing information, see the file LICENSE included with the distribution.
   7
   8         @file monitor/src/program/ZoneReader.cpp
   9
  10 */
  11
  12 #include <stdlib.h>
  13 #include <string.h>
  14
  15 #include "program/ZoneReader.h"
  16 #include "Coordinator.h"
  17 #include "common/Config.h"
  18 #include "common/StringTo.h"
  19
  20 namespace Monitor {
  21 namespace Program {
  22
  23 ZoneReader::ZoneReader(SharedMemory *sharedMemory, Module::List *moduleList) :
  24         m_sharedMemory(sharedMemory), m_moduleList(moduleList) {
  25
  26 }
  27
  28 ZoneReader::~ZoneReader() {
  29
  30 }
  31
  32 void ZoneReader::start() {
  33         pthread_create(&m_threadID, NULL, run, this);
  34 }
  35
  36 void ZoneReader::startInThread() {
  37         m_threadID = pthread_self();
  38         run(this);
  39 }
  40
  41 void ZoneReader::join() {
  42         pthread_join(m_threadID, NULL);
  43 }
  44
  45 void *ZoneReader::run(void *voidInstance) {
  46         uint32_t zoneSize = Common::StringTo<uint32_t>(Coordinator::instance()->vault()->get("zoneSize"))*AesalonPageSize;
  47         uint8_t *packetBuffer = NULL;
  48         uint32_t packetBufferSize = 0;
  49
  50         ZoneReader *instance = static_cast<ZoneReader *>(voidInstance);
  51         while(true) {
  52                 instance->m_sharedMemory->waitForPacket();
  53
  54                 uint8_t *zoneData = instance->m_sharedMemory->zoneWithPacket();
  55                 if(zoneData == NULL) continue;
  56
  57                 ZoneHeader_t *zoneHeader = reinterpret_cast<ZoneHeader_t *>(zoneData);
  58                 SHMPacketHeader_t *packetHeader = NULL;
  59
  60                 uint32_t dataStart = 0;
  61
  62                 if(zoneHeader->head + sizeof(packetHeader) < zoneSize) {
  63                         packetHeader = reinterpret_cast<SHMPacketHeader_t *>(zoneData + zoneHeader->head);
  64                         dataStart = zoneHeader->head + sizeof(packetHeader);
  65                 }
  66                 else {
  67                         packetHeader = reinterpret_cast<SHMPacketHeader_t *>(zoneData + ZoneDataOffset);
  68                         dataStart = ZoneDataOffset + sizeof(packetHeader);
  69                 }
  70
  71                 uint32_t packetSize = packetHeader->packetSize;
  72                 uint8_t *packetData = NULL;
  73                 if(dataStart + packetHeader->packetSize < zoneSize) {
  74                         /* This is straightforwards, all the data is nice and contiguous. */
  75                         packetData = zoneData + dataStart + sizeof(SHMPacketHeader_t);
  76
  77                         zoneHeader->head = dataStart + packetSize;
  78                 }
  79                 else {
  80                         /* This is a bit more complex; the data is in two parts,
  81                                 thus it needs to be copied into a temporary buffer. */
  82
  83                         uint32_t underSize = zoneSize - dataStart - zoneHeader->gapSize;
  84                         uint32_t overSize = packetSize - underSize;
  85
  86                         if(packetBufferSize < packetSize) {
  87                                 /* Replace this w/doubling behaviour? */
  88                                 packetBuffer = static_cast<uint8_t *>(realloc(packetBuffer, packetSize));
  89                                 packetBufferSize = packetSize;
  90                         }
  91                         memcpy(packetBuffer, zoneData + dataStart, underSize);
  92                         memcpy(packetBuffer + underSize, zoneData + ZoneDataOffset, overSize);
  93
  94                         packetData = packetBuffer;
  95
  96                         zoneHeader->head = ZoneDataOffset + overSize;
  97                 }
  98
  99                 std::cout << "Received packet:" << std::endl;
 100                 std::cout << "\tsize: " << packetSize << std::endl;
 101                 std::cout << "\tmoduleID: " << packetHeader->moduleID << std::endl;
 102                 std::cout << "\tPID: " << zoneHeader->processID << std::endl;
 103                 std::cout << "\tTID: " << zoneHeader->threadID << std::endl;
 104                 /* TODO: process packet. Data is in packetData, size of packet is packetSize, and header is packetHeader. */
 105                 /* Other associated information such as the PID and TID of the source are in zoneHeader. */
 106         }
 107         free(packetBuffer);
 108         return NULL;
 109 }
 110
 111 } // namespace Program
 112 } // namespace Monitor