C++ mutex_t类代码示例

void media::release(LinkedObject **nat, unsigned expires)
{
    assert(nat != NULL);

    proxy *member;
    time_t expire = 0;

    if(!*nat)
        return;

    if(expires) {
        time(&expire);
        expire += expires;
    }

    lock.acquire();
    linked_pointer<proxy> pp = *nat;
    while(is(pp)) {
        member = *pp;
        pp.next();
        member->release(expires);
        member->enlist(&runlist);
    }
    lock.release();

    *nat = NULL;
}

    kernel loadKernel(occa::device_v *dHandle,
                      const std::string &kernelName){
      infoID_t infoID;

      infoID.modelID    = dHandle->modelID();
      infoID.kernelName = kernelName;

      headerMutex.lock();
      const infoHeader_t &h = headerMap[infoID];
      headerMutex.unlock();

      const std::string hFilename = fileDatabase::getFilename(h.fileID);
      FILE *inFD = fopen(hFilename.c_str(), "rb");

      char *buffer = new char[h.contentBytes + 1];
      buffer[h.contentBytes] = '\0';

      fseek(inFD, h.contentOffset, SEEK_SET);

      ignoreResult( fread(buffer, sizeof(char), h.contentBytes, inFD) );

      fclose(inFD);

      kernel k = kernel(dHandle->loadKernelFromLibrary(buffer, kernelName));

      delete [] buffer;
      fclose(inFD);

      return k;
    }

void messages::update(const char *uid)
{
    assert(uid == NULL || *uid != 0);

    linked_pointer<message> mp;
    LinkedObject *next;
    unsigned path;
    time_t now;
    if(!uid || !pending)
        return;

    path = NamedObject::keyindex(uid, keysize);
    msglock.lock();
    time(&now);
    mp = msgs[path];
    while(mp) {
        next = mp->getNext();
        if(!stricmp(mp->user, uid)) {
            --pending;
            mp->delist(&msgs[path]);
            if(mp->expires < now)
                mp->enlist(&freelist);
            else
                mp->enlist(&sending);
        }
        mp = next;
    }
    msglock.unlock();
}

int messages::deliver(const char *to, const char *reply, const char *from, caddr_t text, size_t len, const char *msgtype, const char *digest)
{
    message *msg;

    if(!msgtype)
        msgtype = "text/plain";

    if(len > sizeof(msg->body))
        return SIP_MESSAGE_TOO_LARGE;

    msglock.lock();
    msg = static_cast<message *>(freelist);
    if(msg)
        freelist = msg->getNext();
    msglock.unlock();
    if(!msg) {
        ++allocated;
        msg = new message();
    }
    msg->create();
    String::set(msg->reply, sizeof(msg->reply), reply);
    String::set(msg->from, sizeof(msg->from), from);
    String::set(msg->type, sizeof(msg->type), msgtype);
    memset(msg->body, 0, sizeof(msg->body));
    if(len)
        memcpy(msg->body, text, len);
    msg->msglen = len;

    if(!strchr(to, '@')) {
        String::set(msg->user, sizeof(msg->user), to);
        return deliver(msg);
    }
    return remote(to, msg, digest);
}

bool messages::check(void)
{
    shell::log(shell::INFO, "checking messages...");
    msglock.lock();
    msglock.release();
    return true;
}

    int genDeviceID(){
      deviceIDMutex.lock();
      const int id = (currentDeviceID++);
      deviceIDMutex.unlock();

      return id;
    }

OffloadHostTimerData* offload_timer_init(const char *file, int line)
{
    static bool first_time = true;
    OffloadHostTimerData* timer_data = NULL;

    timer_data_mutex.lock();
    {
        if (timer_enabled ||
            (offload_report_level && offload_report_enabled)) {
            timer_data = (OffloadHostTimerData*)
                OFFLOAD_MALLOC(sizeof(OffloadHostTimerData), 0);
            memset(timer_data, 0, sizeof(OffloadHostTimerData));

            timer_data->offload_number = OFFLOAD_DEBUG_INCR_OFLD_NUM() - 1;

            if (timer_data_head == 0) {
                timer_data_head = timer_data;
                timer_data_tail = timer_data;
            }
            else {
                timer_data_tail->next = timer_data;
                timer_data_tail = timer_data;
            }

            timer_data->file = file;
            timer_data->line = line;
        }
    }
    timer_data_mutex.unlock();
    return timer_data;
}

void messages::cleanup(void)
{
    linked_pointer<message> mp;
    LinkedObject *msgnext;
    unsigned msgcount = 0;
    time_t now;

    if(!pending)
        return;

    while(msgcount < keysize) {
        msglock.lock();
        time(&now);
        mp = msgs[msgcount];
        while(mp) {
            msgnext = mp->getNext();
            if(mp->expires < now) {
                mp->delist(&msgs[msgcount]);
                mp->enlist(&freelist);
            }
            mp = msgnext;
        }
        msglock.unlock();
        ++msgcount;
    }
}

    void load(const std::string &filename){
      //---[ Load file ]------
      std::string sBuffer = readFile(filename);
      const char *buffer  = sBuffer.c_str();

      //---[ Read file ]------
      const uint32_t *buffer32 = (const uint32_t*) buffer;
      const uint64_t *buffer64;

      const uint32_t headerCount = *(buffer32++);

      for(uint32_t i = 0; i < headerCount; ++i){
        infoID_t infoID;

        const int mode_ = *(buffer32++);

        buffer64 = (const uint64_t*) buffer32;
        const uint64_t flagsOffset = *(buffer64++);
        const uint64_t flagsBytes  = *(buffer64++);

        const uint64_t contentOffset = *(buffer64++);
        const uint64_t contentBytes  = *(buffer64++);

        const uint64_t kernelNameOffset = *(buffer64++);
        const uint64_t kernelNameBytes  = *(buffer64++);

        buffer32 = (const uint32_t*) buffer64;

        infoID.kernelName = std::string(buffer + kernelNameOffset,
                                        kernelNameBytes);

        deviceIdentifier identifier(mode_,
                                    buffer + flagsOffset, flagsBytes);

        infoID.modelID = deviceModelID(identifier);

        kernelMutex.lock();
        kernelMap[infoID.kernelName].push_back(infoID.modelID);
        kernelMutex.unlock();

        //---[ Input to header map ]----
        headerMutex.lock();
        infoHeader_t &h = headerMap[infoID];

        h.fileID = fileDatabase::getFileID(filename);
        h.mode   = mode_;

        h.flagsOffset = flagsOffset;
        h.flagsBytes  = flagsBytes;

        h.contentOffset = contentOffset;
        h.contentBytes  = contentBytes;

        h.kernelNameOffset = kernelNameOffset;
        h.kernelNameBytes  = kernelNameBytes;
        headerMutex.unlock();
        //==============================
      }
    }

    size_t addToScratchPad(const std::string &s){
      scratchMutex.lock();

      size_t offset = scratchPad.size();
      scratchPad += s;

      scratchMutex.unlock();

      return offset;
    }

void media::thread::run(void)
{
    fd_set session;
    socket_t max;

    shell::log(DEBUG1, "starting media thread");
    running = true;
    socket_t so;
    media::proxy *mp;
    time_t now;

    while(running) {
        lock.acquire();
        max = hiwater;
        memcpy(&session, &connections, sizeof(session));
        lock.release();
        select(max, &session, NULL, NULL, NULL);
        if(!running)
            break;

        time(&now);
        for(so = 0; so < max; ++so) {
#ifdef  _MSWINDOWS_
#else
            char buf[1];
            if(so == control[0] && FD_ISSET(so, &session)) {
                if(::read(so, buf, 1) < 1)
                    shell::log(shell::ERR, "media control failure");
                continue;
            }
#endif
            mp = NULL;
            if(!FD_ISSET(so, &session))
                continue;

            lock.acquire();
            mp = proxymap[so];
            if(mp->so == INVALID_SOCKET) {
                proxymap[so] = NULL;
                mp = NULL;
            }

            if(mp && mp->expires && mp->expires < now)
                mp->release(0);
            else if(mp)
                mp->copy();

            lock.release();
        }
    }

    shell::log(DEBUG1, "stopping media thread");
    running = true;
}

    std::string getFilename(const int id){
      OCCA_CHECK((0 <= id) && (id < filesInDatabase),
                 "File with ID [" << id << "] was not found");

      mutex.lock();

      std::string filename = itsMap[id];

      mutex.unlock();

      return filename;
    }

    int deviceModelID(const occa::deviceIdentifier &id){
      deviceModelMutex.lock();

      deviceModelMapIterator it = deviceModelMap.find(id);

      int dID;

      if(it != deviceModelMap.end())
        dID = it->second;
      else{
        dID = deviceModelMap.size();
        deviceModelMap[id] = dID;
      }

      deviceModelMutex.unlock();

      return dID;
    }

    int getFileID(const std::string &filename){
      int id;

      mutex.lock();

      stiMapIterator it = stiMap.find(filename);

      if(it == stiMap.end()){
        id = (filesInDatabase++);

        stiMap[filename] = id;
        itsMap[id]       = filename;
      }
      else
        id = (it->second);

      mutex.unlock();

      return id;
    }

    occa::kernelDatabase loadKernelDatabase(const std::string &kernelName){
      kernelDatabase kdb(kernelName);

      kernelMutex.lock();

      kernelMapIterator it = kernelMap.find(kernelName);

      if(it != kernelMap.end()){
        std::vector<int> &ids = it->second;

        const int idCount = ids.size();

        for(int i = 0; i < idCount; ++i)
          kdb.modelKernelIsAvailable(ids[i]);
      }

      kernelMutex.unlock();

      return kdb;
    }