int getDescriptor(int index) {
int offset = SIZEOF_KEVENT * index + FD_OFFSET;
/* The ident field is 8 bytes in 64-bit world, however the API wants us
* to return an int. Hence read the 8 bytes but return as an int.
*/
if (is64bit) {
long fd = keventArray.getLong(offset);
assert fd <= Integer.MAX_VALUE;
return (int) fd;
} else {
return keventArray.getInt(offset);
}
}
void updateRegistrations() throws IOException {
// Populate pollfd array with updated masks
synchronized (updateList) {
while (updateList.size() > 0) {
// We have to insert a dummy node in between each
// real update to use POLLREMOVE on the fd first because
// otherwise the changes are simply OR'd together
int index = 0;
Updator u = null;
while ((u = updateList.poll()) != null) {
// First add pollfd struct to clear out this fd
putPollFD(updatePollArray, index, u.fd, POLLREMOVE);
index++;
// Now add pollfd to update this fd, if necessary
if (u.mask != POLLREMOVE) {
putPollFD(updatePollArray, index, u.fd, (short) u.mask);
index++;
}
// Check against the max update size; these are
// all we will process. Valid index ranges from 0 to
// (MAX_UPDATE_SIZE - 1) and we can use up to 2 per loop
if (index > MAX_UPDATE_SIZE - 2) break;
}
// Register the changes with /dev/poll
registerMultiple(wfd, updatePollArray.address(), index);
}
}
}
void close() throws IOException {
if (keventArray != null) {
keventArray.free();
keventArray = null;
}
if (kq >= 0) {
FileDispatcherImpl.closeIntFD(kq);
kq = -1;
}
}
int getReventOps(int index) {
int result = 0;
int offset = SIZEOF_KEVENT * index + FILTER_OFFSET;
short filter = keventArray.getShort(offset);
// This is all that's necessary based on inspection of usage:
// SinkChannelImpl, SourceChannelImpl, DatagramChannelImpl,
// ServerSocketChannelImpl, SocketChannelImpl
if (filter == EVFILT_READ) {
result |= POLLIN;
} else if (filter == EVFILT_WRITE) {
result |= POLLOUT;
}
return result;
}
private void putPollFD(AllocatedNativeObject array, int index, int fd, short event) {
int structIndex = SIZE_POLLFD * index;
array.putInt(structIndex + FD_OFFSET, fd);
array.putShort(structIndex + EVENT_OFFSET, event);
array.putShort(structIndex + REVENT_OFFSET, (short) 0);
}
void closeDevPollFD() throws IOException {
FileDispatcherImpl.closeIntFD(wfd);
pollArray.free();
updatePollArray.free();
}
int getDescriptor(int i) {
int offset = SIZE_POLLFD * i + FD_OFFSET;
return pollArray.getInt(offset);
}
int getReventOps(int i) {
int offset = SIZE_POLLFD * i + REVENT_OFFSET;
return pollArray.getShort(offset);
}
void putReventOps(int i, int revent) {
int offset = SIZE_POLLFD * i + REVENT_OFFSET;
pollArray.putShort(offset, (short) revent);
}
KQueueArrayWrapper() {
int allocationSize = SIZEOF_KEVENT * NUM_KEVENTS;
keventArray = new AllocatedNativeObject(allocationSize, true);
keventArrayAddress = keventArray.address();
kq = init();
}