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MotionManager.h

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00001 //-*-c++-*-
00002 #ifndef INCLUDED_MotionManager_h
00003 #define INCLUDED_MotionManager_h
00004 
00005 #include "MotionCommand.h"
00006 #include "OutputCmd.h"
00007 #include "OutputPID.h"
00008 #include "Shared/RobotInfo.h"
00009 #include "Shared/ListMemBuf.h"
00010 #include "Shared/MutexLock.h"
00011 
00012 #ifdef PLATFORM_APERIOS
00013 #include "Shared/SharedObject.h"
00014 #include "MotionManagerMsg.h"
00015 #endif
00016 
00017 #ifdef PLATFORM_APERIOS
00018 #include <OPENR/OPENR.h>
00019 #include <OPENR/OPENRAPI.h>
00020 #include <OPENR/OSubject.h>
00021 #include <OPENR/ObjcommEvent.h>
00022 #include <OPENR/OObject.h>
00023 #endif
00024 
00025 //! The purpose of this class is to provide mutually exclusive access to the MotionCommands and simplify their sharing between memory spaces
00026 /*! Since MotionObject and MainObject run as separate processes, they
00027  *  could potentially try to access the same motion command at the
00028  *  same time, leading to unpredictable behavior.  The MotionManager
00029  *  enforces a set of locks to solve this.
00030  *
00031  *  The other problem is that we are sharing between processes.
00032  *  MotionManager will do what's necessary to distribute new
00033  *  MotionCommand's to all the processes (currently just MainObj and
00034  *  MotoObj)\n You should be able to create and add a new motion in
00035  *  one line:
00036  *
00037  *  @code
00038  *  motman->addMotion(SharedObject<YourMC>([arg1,[arg2,...]]) [, priority [, autoprune] ]);
00039  *  @endcode
00040  *  
00041  *  But if you want to do some more initializations not handled by the
00042  *  constructor (the @p arg1, @p arg2, ...  params) then you would
00043  *  want to do something like the following:
00044  *  
00045  *  @code
00046  *  SharedObject<YourMC> tmpvar([arg1,[arg2,...]]);
00047  *  tmpvar->cmd1();
00048  *  tmpvar->cmd2();
00049  *  //...
00050  *  motman->addMotion(tmpvar [, ...]);
00051  *  @endcode
00052  *
00053  *  Notice that tmpvar is of type SharedObject, but you're calling @c
00054  *  YourMC functions on it...  SharedObject is a "smart pointer" which
00055  *  will pass your function calls on to the underlying templated type.
00056  *  Isn't C++ great? :)
00057  *
00058  *  @warning Once the MotionCommand has been added you must check it
00059  *  out to modify it or risk concurrent access problems.
00060  *
00061  *  @see MotionCommand for information on creating new motion primitives.
00062  *
00063  *  @see MMAccessor for information on accessing motions after you've
00064  *  added them to MotionManager.
00065  */
00066 class MotionManager {
00067 public:
00068   //! This is the number of processes which will be accessing the MotionManager
00069   /*! Probably just MainObject and MotionObject... This isn't really a
00070    *  hard maximum, but should be actual expected, need to know when
00071    *  they're all connected */
00072   static const unsigned int MAX_ACCESS=2;
00073 
00074   static const unsigned int MAX_MOTIONS=64;   //!< This is the maximum number of Motions which can be managed, can probably be increased reasonably without trouble
00075 
00076   typedef MotionManagerMsg::MC_ID MC_ID;      //!< use this type when referring to the ID numbers that MotionManager hands out
00077   static const MC_ID invalid_MC_ID=MotionManagerMsg::invalid_MC_ID; //!< for errors and undefined stuff
00078 
00079   //!Just to give you some guidelines for what values to use for different priority levels, but you can pick any value you like (that's why they are floats)
00080   //!@name Priority Level Constants
00081   static const float kIgnoredPriority;    //!< won't be expressed, handy if you want to temporarily pause something
00082   static const float kBackgroundPriority; //!< will only be expressed if *nothing* else is using that joint
00083   static const float kLowPriority;        //!< for stuff that's not background but lower than standard
00084   static const float kStdPriority;        //!< for every-day commands
00085   static const float kHighPriority;       //!< for stuff that should override standard stuff
00086   static const float kEmergencyPriority;  //!< for really important stuff, such as the emergency stop
00087   //@}
00088 
00089   MotionManager();                            //!< Constructor, sets all the outputs to 0
00090 
00091 #ifdef PLATFORM_APERIOS
00092   void InitAccess(OSubject* subj);            //!< @b LOCKS @b MotionManager Everyone who is planning to use the MotionManager needs to call this before they access it or suffer a horrible fate
00093   void receivedMsg(const ONotifyEvent& event); //!< @b LOCKS @b MotionManager This gets called by an OObject when it receives a message from one of the other OObject's MotionManagerComm Subject
00094 #endif
00095 
00096   //!@name MotionCommand Safe
00097   void setOutput(const MotionCommand* caller, unsigned int output, const OutputCmd& cmd); //!< @b LOCKS @b MotionManager Requests a value be set for the specified output, copies cmd across frames
00098   void setOutput(const MotionCommand* caller, unsigned int output, const OutputCmd& cmd, unsigned int frame); //!< @b LOCKS @b MotionManager Requests a value be set for the specified output in the specified frame
00099   void setOutput(const MotionCommand* caller, unsigned int output, const OutputCmd cmd[NumFrames]); //!< @b LOCKS @b MotionManager Requests a value be set for the specified output across frames
00100   void setOutput(const MotionCommand* caller, unsigned int output, const OutputPID& pid); //!< @b LOCKS @b MotionManager Requests a PID be set for the specified output, notice that this might be overruled by a higher priority motion
00101   void setOutput(const MotionCommand* caller, unsigned int output, const OutputCmd& cmd, const OutputPID& pid); //!< @b LOCKS @b MotionManager Requests a value and PID be set for the specified output
00102   void setOutput(const MotionCommand* caller, unsigned int output, const OutputCmd cmd[NumFrames], const OutputPID& pid); //!< @b LOCKS @b MotionManager Requests a value and PID be set for the specified output
00103   const OutputCmd& getOutputCmd(unsigned int output) const { return cmds[output]; } //!< Returns the value of the output last sent to the OS.  Note that this will differ from the sensed value in state, even when staying still.  There is no corresponding getOutputPID because this value *will* duplicate the value in state.
00104   void setPriority(MC_ID mcid, float p) { cmdlist[mcid].priority=p; }//!< sets the priority level of a MotionCommand
00105   float getPriority(MC_ID mcid) const { return cmdlist[mcid].priority; } //!< returns priority level of a MotionCommand
00106   //@}
00107 
00108   //@{
00109   inline MC_ID begin() const         { return skip_ahead(cmdlist.begin()); }   //!< returns the MC_ID of the first MotionCommand
00110   inline MC_ID next(MC_ID cur) const { return skip_ahead(cmdlist.next(cur)); } //!< returns the MC_ID of MotionCommand following the one that is passed
00111   inline MC_ID end() const           { return cmdlist.end();      } //!< returns the MC_ID of the one-past-the-end MotionCommand (like the STL)
00112   inline unsigned int size() const   { return cmdlist.size();     } //!< returns the number of MotionCommands being managed
00113   //@}
00114 
00115   //!You can have one MC check out and modify another, but make sure the other MC doesn't call setOutput()
00116   //!@name MotionCommand "Risky"
00117   MotionCommand * checkoutMotion(MC_ID mcid,bool block=true); //!< locks the command and possibly performs RTTI conversion; supports recursive calls
00118   void checkinMotion(MC_ID mcid); //!< marks a MotionCommand as unused
00119   MotionCommand * peekMotion(MC_ID mcid) { return mcid==invalid_MC_ID?NULL:cmdlist[mcid].baseaddrs[_MMaccID]; } //!< allows access to a MotionCommand without checking it out; warning @b never call a function based on this, only access member fields through it
00120   unsigned int checkoutLevel(MC_ID mcid) { return mcid==invalid_MC_ID?0:cmdlist[mcid].lock.get_lock_level(); } //!< returns the number of times @a mcid has been checked out minus the times it's been checked in
00121   bool isOwner(MC_ID mcid) { return mcid==invalid_MC_ID?false:(cmdlist[mcid].lock.owner()==_MMaccID); }
00122   //@}
00123 
00124   //!@name MotionCommand Unsafe
00125   //@{
00126 #ifdef PLATFORM_APERIOS
00127   MC_ID addMotion(const SharedObjectBase& sm); //!< @b LOCKS @b MotionManager Creates a new MotionCommand, automatically sharing it between processes (there is some lag time here)
00128   MC_ID addMotion(const SharedObjectBase& sm, float priority); //!< @b LOCKS @b MotionManager allows a quick way to set a priority level of a new MotionCommand
00129   MC_ID addMotion(const SharedObjectBase& sm, bool autoprune); //!< @b LOCKS @b MotionManager allows a quick was to set the autoprune flag
00130   MC_ID addMotion(const SharedObjectBase& sm, float priority, bool autoprune); //!< @b LOCKS @b MotionManager Call one of these to add a MotionCommand to the MotionManager, using the SharedObject class
00131 #endif //PLATFORM_APERIOS
00132   void removeMotion(MC_ID mcid); //!< @b LOCKS @b MotionManager removes the specified MotionCommand
00133   //@}
00134 
00135   //@{
00136   void lock()    { MMlock.lock(_MMaccID); } //!< gets an exclusive lock on MotionManager - functions marked @b LOCKS @b MotionManager will cause (and require) this to happen automatically
00137   bool trylock() { return MMlock.try_lock(_MMaccID); } //!< tries to get a lock without blocking
00138   void release() { MMlock.release(); } //!< releases a lock on the motion manager
00139   //@}
00140 
00141   //@{
00142   void getOutputs(float outputs[NumFrames][NumOutputs]);  //!< @b LOCKS @b MotionManager called by MotionObject to fill in the output values for the next ::NumFrames frames (only MotoObj should call this...)
00143   void updateWorldState();                                //!< call this when you want MotionManager to set the WorldState to reflect what things should be for unsensed outputs (LEDs, ears) (only MotoObj should be calling this...)
00144 #ifdef PLATFORM_APERIOS
00145   bool updatePIDs(OPrimitiveID primIDs[NumOutputs]);      //!< call this when you want MotionManager to update modified PID values, returns true if changes made (only MotoObj should be calling this...), see PIDMC for general PID documentation
00146 #endif
00147   //@}
00148 
00149   //! holds the full requested value of an output
00150   class OutputState {
00151   public:
00152     //!@name Constructors
00153     //!Constructor
00154     OutputState();
00155     OutputState(unsigned int out, float pri, MC_ID mc, const OutputCmd cmds[NumFrames]);
00156     OutputState(unsigned int out, float pri, MC_ID mc, const OutputCmd& cmd);
00157     OutputState(unsigned int out, float pri, MC_ID mc, const OutputCmd& cmd, unsigned int frame);
00158     OutputState(unsigned int out, float pri, MC_ID mc, const OutputPID& p);
00159     OutputState(unsigned int out, float pri, MC_ID mc, const OutputCmd cmds[NumFrames], const OutputPID& p);
00160     OutputState(unsigned int out, float pri, MC_ID mc, const OutputCmd& cmd, const OutputPID& p);
00161     //@}
00162     float priority;             //!< priority level
00163     MC_ID mcid;                 //!< MC_ID of requester
00164     OutputCmd frames[NumFrames]; //!< values of output planned ahead
00165     OutputPID pid;               //!< pid of output
00166   };
00167 
00168 protected:
00169   //! used to request pids for a given joint
00170   struct PIDUpdate {
00171     //!constructor
00172     PIDUpdate() : joint((unsigned int)-1) {}
00173     //!constructor
00174     PIDUpdate(unsigned int j, const float p[3]) : joint(j) {
00175       for(unsigned int i=0; i<3; i++)
00176         pids[i]=p[i];
00177     }
00178     unsigned int joint; //!< the joint ID (see RobotInfo.h for offset values)
00179     float pids[3]; //!< the PID values to use (see ::Pid )
00180   };
00181   ListMemBuf<PIDUpdate,NumPIDJoints> pidchanges;  //!< stores PID updates, up to one per joint (if same is set more than once, it's just overwrites previous update)
00182   void setPID(unsigned int j, const float p[3]); //!< @b LOCKS @b MotionManager, called internally to do the work of setting the PID... you probably want to call setOutput with an OutputPID argument, not this...
00183 
00184   typedef unsigned short accID_t; //!< type to use to refer to accessors of MotionManager (or its locks)
00185 
00186   void func_begin() { MMlock.lock(_MMaccID); } //!< called at the begining of many functions to lock MotionManager
00187   void func_end() { MMlock.release(); } //!< called at the end of a function which called func_begin() to release it
00188   template<class T> T func_end(T val) { func_end(); return val; } //!< same as func_end(), except passes return value through
00189 
00190   MC_ID skip_ahead(MC_ID mcid) const; //!< during iteration, skips over motioncommands which are still in transit from on OObject to another
00191     
00192   //!All the information we need to maintain about a MotionCommand
00193   struct CommandEntry {
00194     //! Constructor, sets everything to basics
00195     CommandEntry() : lastAccessor((unsigned short)-1),lock(),priority(MotionManager::kStdPriority) {
00196       for(unsigned int i=0; i<MAX_ACCESS; i++) {
00197         baseaddrs[i]=NULL;
00198 #ifdef PLATFORM_APERIOS
00199         rcr[i]=NULL;
00200 #endif
00201       }
00202     }
00203     MotionCommand * baseaddrs[MAX_ACCESS]; //!< for each accessor, the base address of the motion command
00204 #ifdef PLATFORM_APERIOS
00205     RCRegion * rcr[MAX_ACCESS];            //!< for each accessor the shared memory region that holds the motion command
00206 #endif
00207     accID_t lastAccessor;                  //!< the ID of the last accessor to touch the command (which implies if it wants to touch this again, we don't have to convert again)
00208     MutexLock<MAX_ACCESS> lock;            //!< a lock to maintain mutual exclusion
00209     float priority;                        //!< MotionCommand's priority level
00210   private:
00211     CommandEntry(const CommandEntry&); //!< this shouldn't be called...
00212     CommandEntry& operator=(const CommandEntry&); //!< this shouldn't be called...
00213   };
00214   ListMemBuf<CommandEntry,MAX_MOTIONS,MC_ID> cmdlist;     //!< the list where MotionCommands are stored, remember, we're in a shared memory region with different base addresses - no pointers!
00215   MC_ID cur_cmd; //!< MC_ID of the MotionCommand currently being updated by getOutputs(), or NULL if not in getOutputs.  This is used by the setOutput()'s to tell which MotionCommand is calling
00216 
00217 
00218   inline MC_ID pop_free() { return cmdlist.new_front(); } //!<pulls an entry from cmdlist's free section and returns its index
00219   inline void push_free(MC_ID a) { cmdlist.erase(a); }    //!<puts an entry back into cmdlist's free section
00220 
00221   MutexLock<MAX_ACCESS> MMlock;          //!< The main lock for the class
00222 
00223   typedef ListMemBuf<OutputState,MAX_MOTIONS> cmdstatelist_t; //!< shorthand for a list of OutputState's
00224   cmdstatelist_t cmdstates[NumOutputs];  //!< requested positions by each of the MC's for each of the outputs
00225   float cmdSums[NumOutputs];             //!<Holds the final values for the outputs of the last frame generated
00226   OutputCmd cmds[NumOutputs];            //!<Holds the weighted values and total weight for the outputs of the last frame
00227 
00228 #ifdef PLATFORM_APERIOS
00229   accID_t numAcc;                        //!<The number of accessors who have registered with InitAccess()
00230   OSubject* subjs[MAX_ACCESS];           //!<The OSubject for each process (accessor) on which it should be broadcast when a command is added
00231 #endif
00232 
00233   static int _MMaccID;          //!<Stores the accessor for the current process
00234 
00235 private:
00236   MotionManager(const MotionManager&); //!< this shouldn't be called...
00237   MotionManager& operator=(const MotionManager&); //!< this shouldn't be called...
00238 };
00239 
00240 //!anyone who #includes MotionManager.h will be wanting to use the global motman... don't want multiple of these! created by MotoObj
00241 extern MotionManager * motman;
00242 
00243 /*! @file
00244  * @brief Describes MotionManager, simplifies sharing of MotionCommand's and provides mutual exclusion to their access
00245  * @author ejt (Creator)
00246  *
00247  * $Author: ejt $
00248  * $Name: tekkotsu-2_1 $
00249  * $Revision: 1.20 $
00250  * $State: Exp $
00251  * $Date: 2004/02/09 22:45:28 $
00252  */
00253 
00254 #endif

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