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use node->trylock() in VoxelSendThread() to handle shutdown race condition

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This commit is contained in:
ZappoMan 2013-11-13 15:11:43 -08:00
parent 52d86a8619
commit 3d20152c36
2 changed files with 32 additions and 21 deletions
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3
libraries/shared/src/Node.h
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@ -71,6 +71,9 @@ public:
void setPingMs(int pingMs) { _pingMs = pingMs; }
void lock() { pthread_mutex_lock(&_mutex); }
/// returns false if lock failed, true if you got the lock
bool trylock() { return (pthread_mutex_trylock(&_mutex) == 0); }
void unlock() { pthread_mutex_unlock(&_mutex); }
static void printLog(Node const&);

50
libraries/voxel-server-library/src/VoxelSendThread.cpp
View file

@ -31,39 +31,47 @@ bool VoxelSendThread::process() {
Node* node = NodeList::getInstance()->nodeWithUUID(_nodeUUID);
if (node) {
node->lock(); // make sure the node list doesn't kill our node while we're using it
VoxelNodeData* nodeData = NULL;
// make sure the node list doesn't kill our node while we're using it
if (node->trylock()) {
VoxelNodeData* nodeData = NULL;
nodeData = (VoxelNodeData*) node->getLinkedData();
nodeData = (VoxelNodeData*) node->getLinkedData();
int packetsSent = 0;
int packetsSent = 0;
// Sometimes the node data has not yet been linked, in which case we can't really do anything
if (nodeData) {
bool viewFrustumChanged = nodeData->updateCurrentViewFrustum();
if (_myServer->wantsDebugVoxelSending()) {
printf("nodeData->updateCurrentViewFrustum() changed=%s\n", debug::valueOf(viewFrustumChanged));
// Sometimes the node data has not yet been linked, in which case we can't really do anything
if (nodeData) {
bool viewFrustumChanged = nodeData->updateCurrentViewFrustum();
if (_myServer->wantsDebugVoxelSending()) {
printf("nodeData->updateCurrentViewFrustum() changed=%s\n", debug::valueOf(viewFrustumChanged));
}
packetsSent = deepestLevelVoxelDistributor(node, nodeData, viewFrustumChanged);
}
packetsSent = deepestLevelVoxelDistributor(node, nodeData, viewFrustumChanged);
}
node->unlock(); // we're done with this node for now.
node->unlock(); // we're done with this node for now.
} else {
qDebug("VoxelSendThread::process() failed to lock node...isStillRunning()=%s\n",
debug::valueOf(isStillRunning()));
}
}
} else {
if (_myServer->wantsDebugVoxelSending()) {
qDebug("VoxelSendThread::process() waiting for isInitialLoadComplete()\n");
}
}
// dynamically sleep until we need to fire off the next set of voxels
int elapsed = (usecTimestampNow() - start);
int usecToSleep = VOXEL_SEND_INTERVAL_USECS - elapsed;
// Only sleep if we're still running...
if (isStillRunning()) {
// dynamically sleep until we need to fire off the next set of voxels
int elapsed = (usecTimestampNow() - start);
int usecToSleep = VOXEL_SEND_INTERVAL_USECS - elapsed;
if (usecToSleep > 0) {
usleep(usecToSleep);
} else {
if (_myServer->wantsDebugVoxelSending()) {
std::cout << "Last send took too much time, not sleeping!\n";
if (usecToSleep > 0) {
usleep(usecToSleep);
} else {
if (_myServer->wantsDebugVoxelSending()) {
std::cout << "Last send took too much time, not sleeping!\n";
}
}
}