void vrpn_PeerMutex::mainloop (void) {
int i;
d_server->mainloop();
for (i = 0; i < d_numPeers; i++) {
d_peer[i]->mainloop();
}
checkGrantMutex();
}
void vrpn_PeerMutex::request(void)
{
int i;
// No point in sending requests if it's not currently available.
// However, we need to trigger any local denial callbacks; otherwise
// this looks like a silent failure.
if (!isAvailable()) {
triggerDenyCallbacks();
#ifdef VERBOSE
fprintf(stderr,
"vrpn_PeerMutex::request: the mutex isn't available.\n");
#endif
return;
}
d_state = REQUESTING;
d_numPeersGrantingLock = 0;
for (i = 0; i < d_numPeers; i++) {
// d_peerData[i].grantedLock = VRPN_FALSE;
sendRequest(d_peer[i]);
}
// If somebody else sends a request before we get all our grants,
// and their IP/port# is lower than ours, we have to yield to them.
d_holderIP = d_myIP;
d_holderPort = d_myPort;
// We used to wait until the next pass through mainloop() to check
// this (our request could be trivially granted if we have no
// peers), but that leads to bad things (TM), like having to
// insert extra calls to mainloop() in client code just to guarantee
// that we have the mutex.
checkGrantMutex();
#ifdef VERBOSE
fprintf(stderr, "vrpn_PeerMutex::request: requested the mutex "
"(from %d peers).\n",
d_numPeers);
#endif
}
