C++ pid函数代码示例

Port AuthHostInstance::activate()
{
	StLock<Mutex> _(*this);
	if (state() != alive)
	{
		if ((mHostType == securityAgent)) {
		    if (!(session().attributes() & sessionHasGraphicAccess))
			CssmError::throwMe(CSSM_ERRCODE_NO_USER_INTERACTION);
		    if (inDarkWake())
			CssmError::throwMe(CSSM_ERRCODE_IN_DARK_WAKE);
		}

		fork();
		switch (ServerChild::state()) {
		case Child::alive:
			secdebug("AuthHostInstance", "%p (pid %d) has launched", this, pid());
			break;
		case Child::dead:
			secdebug("AuthHostInstance", "%p (pid %d) failed on startup", this, pid());
			break;
		default:
			assert(false);
		}
	}

	if (!ready())
		CssmError::throwMe(CSSM_ERRCODE_NO_USER_INTERACTION);

	return servicePort();
}

//------------------------------------------------------------------------------
// Name: kill
// Desc:
//------------------------------------------------------------------------------
void DebuggerCore::kill() {
	if(attached()) {
		clear_breakpoints();
		ptrace(PT_KILL, pid(), 0, 0);
		native::waitpid(pid(), 0, WAIT_ANY);
		pid_ = 0;
		threads_.clear();
	}
}

EXPORT_C void RMemSpySession::GetProcessIdByThreadId( TProcessId& aPID, TThreadId aTID )
	{	
	TPckgBuf<TProcessId> pid(aPID);
	TPckgBuf<TThreadId> tid(aTID);
	
	TIpcArgs args( &pid, &tid );
	User::LeaveIfError( SendReceive( EMemSpyClientServerOpGetProcessIdByThreadId, args ) );
	aPID = pid();
	}

/*******************************************************************************
 forkcmd
*******************************************************************************/
forkcmd::forkcmd(bool wait_term) :
   _pid(fork()),
   _status(0),
   _wait(wait_term)
{
   if (pid())
   {
      std::cout << "Forked " << pid() << std::endl ;
      PCOMN_THROW_MSG_IF(pid() < 0, std::runtime_error, "Error while forking: %s", strerror(errno)) ;
   }
}

//
// Take a living child and cut it loose. This sets its state to abandoned
// and removes it from the child registry.
// This is one thing you can do in the destructor of your subclass to legally
// dispose of your child's process.
//
void Child::abandon()
{
	StLock<Mutex> _(mChildren());
	if (mState == alive) {
		secdebug("unixchild", "%p (pid %d) abandoned", this, pid());
		mState = abandoned;
		mChildren().erase(pid());
	} else {
		secdebug("unixchild", "%p (pid %d) is not alive; abandon() ignored",
			this, pid());
	}
}

dvl::pid_table::pid_table()
{
	//register internal ids
	set_group(pid().set_group(GROUP_INTERNAL), L"INTERNAL");

	set_element(EMPTY, L"EMPTY");
	set_element(PARSER, L"PARSER");

	//register diagnostic routines
	set_group(pid().set_group(GROUP_DIAGNOSTIC), L"DIAGNOSTIC");

	set_element(ECHO, L"ECHO");
}

Monitor::TreeNode*
Monitor::MonitorDataStorage::getTransportNode(
  const TransportKey& key,
  bool&               create
)
{
  TreeNode* node = 0;
  TransportToTreeMap::iterator location
    = this->transportToTreeMap_.find( key);
  if( location == this->transportToTreeMap_.end()) {
    // We are done if not creating a new node.
    if( !create) return 0;

    // This transport needs to be installed.

    // Find the parent node, if any.  It is ok to not have a parent node
    // for cases of out-of-order updates.  We handle that as the updates
    // are actually processed.
    ProcessKey pid( key.host, key.pid);
    TreeNode* parent = this->getProcessNode( pid, create);

    QList<QVariant> list;
    QString value = QString("0x%1")
                    .arg( key.transport, 8, 16, QLatin1Char('0'));
    list << QString( QObject::tr( "Transport")) << value;
    node = new TreeNode( list, parent);
    if( parent) {
      parent->append( node);
    }

    // Install the new node.
    this->transportToTreeMap_[ key] = std::make_pair( node->row(), node);

  } else {
    node = location->second.second;
    create = false;
  }

  // If there have been some out-of-order reports, we may have been
  // created without a parent node.  We can fill in that information now
  // if we can.  If we created the node, we already know it has a
  // parent so this will be bypassed.
  if( !node->parent()) {
    create = true;
    ProcessKey pid( key.host, key.pid);
    node->parent() = this->getProcessNode( pid, create);
  }

//node->setColor(1,QColor("#ffbfbf"));
  return node;
}

int main(int argc, char **argv) {

   if(argc < 5) {
      std::cout << "Invalid number of args." << std::endl;
      return 0;
   }

   auto maxPwm = atof(argv[1]);
   if(maxPwm < 1.34 || maxPwm > 1.7) {
      std::cout << "Max pulse width needs to be in range 1.34-1.7." << std::endl;
      return 0;
   }

   auto pGain = atof(argv[2]);
   if(pGain < 0) {
      std::cout << "Proportional gain needs to be larget than zero." << std::endl;
      return 0;
   }

   auto iGain = atof(argv[3]);
   if(iGain < 0) {
      std::cout << "Integral gain needs to be larget than zero." << std::endl;
      return 0;
   }

   auto dGain = atof(argv[4]);
   if(dGain < 0) {
      std::cout << "Derivative gain needs to be larget than zero." << std::endl;
      return 0;
   }

   drone<servo, pid> d(std::vector<servo>({ 
                         servo(4, 1.2, maxPwm, pins::instance().pwm),
                         servo(5, 1.2, maxPwm, pins::instance().pwm),
                         servo(6, 1.2, maxPwm, pins::instance().pwm),
                         servo(7, 1.2, maxPwm, pins::instance().pwm) }),
                       std::vector<pid>({ 
                         pid(pGain, iGain, dGain),
                         pid(pGain, iGain, dGain),
                         pid(pGain, iGain, dGain) }));
   stupid = &d;

   struct sigaction sigIntHandler;
   sigIntHandler.sa_handler = ting;
   sigemptyset(&sigIntHandler.sa_mask);  
   sigIntHandler.sa_flags = 0;
   sigaction(SIGINT, &sigIntHandler, NULL);
 
   d.run();
}

//
// Common kill code.
// Requires caller to hold mChildren() lock.
//
void Child::tryKill(int signal)
{
	assert(mState == alive);	// ... or don't bother us
	secdebug("unixchild", "%p (pid %d) sending signal(%d)", this, pid(), signal);
	if (::kill(pid(), signal))
		switch (errno) {
		case ESRCH: // someone else reaped ths child; or things are just wacky
			secdebug("unixchild", "%p (pid %d) has disappeared!", this, pid());
			mState = invalid;
			mChildren().erase(pid());
			// fall through
		default:
			UnixError::throwMe();
		}
}

//------------------------------------------------------------------------------
// Name: kill
// Desc:
//------------------------------------------------------------------------------
void DebuggerCore::kill() {
	if(attached()) {
		clear_breakpoints();

		ptrace(PTRACE_KILL, pid(), 0, 0);

		// TODO: do i need to actually do this wait?
		native::waitpid(pid(), 0, __WALL);

		delete process_;
		process_ = 0;

		reset();
	}
}

//------------------------------------------------------------------------------
// Name: stop_threads
// Desc:
//------------------------------------------------------------------------------
void DebuggerCore::stop_threads() {
	if(process_) {
		for(auto &thread: process_->threads()) {
			const edb::tid_t tid = thread->tid();

			if(!waited_threads_.contains(tid)) {
			
				if(auto thread_ptr = static_cast<PlatformThread *>(thread.get())) {
			
					syscall(SYS_tgkill, pid(), tid, SIGSTOP);

					int thread_status;
					if(native::waitpid(tid, &thread_status, __WALL) > 0) {
						waited_threads_.insert(tid);
						thread_ptr->status_ = thread_status;

						if(!WIFSTOPPED(thread_status) || WSTOPSIG(thread_status) != SIGSTOP) {
							qDebug("[warning] paused thread [%d] received an event besides SIGSTOP", tid);
						}
					}
				}
			}
		}
	}
}

TEST (PID, PidEquilibrates)
{
    float target, Kp, Ki, Kd;
    float state, dt;
    int step_time, nsteps;

    const float target_start = 0.f;
    const float target_end   = 1.f;
    const float tolerance = 1e-5;
    
    state = target = 0.f;
    step_time = 20;
    nsteps = 200;

    dt = 0.1;
    Kp = 3.f;
    Ki = 2.f;
    Kd = 3.f;
    
    PidControl<float> pid(target-state, Kp, Ki, Kd);

    for (int i = 0; i < nsteps; ++i) {
        target = i < step_time ? target_start : target_end;
        state += dt * pid.update(target-state);
        // printf("%g\n", state);
    }

    ASSERT_LE(fabs(state - target_end), tolerance);
}

 /** Caculate the PID for the roll */
 inline float roll(const float &roll) {
   #ifdef PITCH_ROLL_DEBUG
   Serial.print(_roll);
   Serial.print(",");
   #endif
   return pid(P_ROLL, I_ROLL, D_ROLL, _pid_roll[0], _pid_roll[1], roll, _roll * DEG_SEC);
 }

 /** Caculate the PID for the pitch */
 inline float pitch(const float &pitch) {
   #ifdef PITCH_ROLL_DEBUG
   Serial.print(_pitch);
   Serial.print(",");
   #endif
   return pid(P_PITCH, I_PITCH, D_PITCH, _pid_pitch[0], _pid_pitch[1], pitch, _pitch * DEG_SEC);
 }

 /** Caculate the PID for the yaw */
 inline float yaw(const float &yaw) {
   #ifdef PITCH_ROLL_DEBUG
   Serial.print(_yaw);
   Serial.println();
   #endif
   return pid(P_YAW, I_YAW, D_YAW, _pid_yaw[0], _pid_yaw[1], yaw, _yaw * DEG_SEC);
 }