src/ipc/Strand.cc

   1 /*
   2  * $Id$
   3  *
   4  * DEBUG: section 54    Interprocess Communication
   5  *
   6  */
   7
   8 #include "config.h"
   9 #include "ipc/Strand.h"
  10 #include "ipc/Messages.h"
  11 #include "ipc/SharedListen.h"
  12 #include "ipc/Kids.h"
  13
  14
  15 CBDATA_NAMESPACED_CLASS_INIT(Ipc, Strand);
  16
  17
  18 Ipc::Strand::Strand():
  19     Port(MakeAddr(strandAddrPfx, KidIdentifier)),
  20     isRegistered(false)
  21 {
  22 }
  23
  24 void Ipc::Strand::start()
  25 {
  26     Port::start();
  27     registerSelf();
  28 }
  29
  30 void Ipc::Strand::registerSelf()
  31 {
  32     debugs(54, 6, HERE);
  33     Must(!isRegistered);
  34     TypedMsgHdr message;
  35     StrandCoord(KidIdentifier, getpid()).pack(message);
  36     SendMessage(coordinatorAddr, message);
  37     setTimeout(6, "Ipc::Strand::timeoutHandler"); // TODO: make 6 configurable?
  38 }
  39
  40 void Ipc::Strand::receive(const TypedMsgHdr &message)
  41 {
  42     debugs(54, 6, HERE << message.type());
  43     switch (message.type()) {
  44
  45     case mtRegistration:
  46         handleRegistrationResponse(StrandCoord(message));
  47         break;
  48
  49     case mtSharedListenResponse:
  50         SharedListenJoined(SharedListenResponse(message));
  51         break;
  52
  53     default:
  54         debugs(54, 1, HERE << "Unhandled message type: " << message.type());
  55         break;
  56     }
  57 }
  58
  59 void Ipc::Strand::handleRegistrationResponse(const StrandCoord &strand)
  60 {
  61     // handle registration response from the coordinator; it could be stale
  62     if (strand.kidId == KidIdentifier && strand.pid == getpid()) {
  63         debugs(54, 6, "kid" << KidIdentifier << " registered");
  64         clearTimeout(); // we are done
  65     } else {
  66         // could be an ACK to the registration message of our dead predecessor
  67         debugs(54, 6, "kid" << KidIdentifier << " is not yet registered");
  68         // keep listening, with a timeout
  69     }
  70 }
  71
  72 void Ipc::Strand::timedout()
  73 {
  74     debugs(54, 6, HERE << isRegistered);
  75     if (!isRegistered)
  76         fatalf("kid%d registration timed out", KidIdentifier);
  77 }