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/**
@file GUniqueID.cpp
@author Morgan McGuire, morgan@cs.williams.edu
*/
#include "G3D/GUniqueID.h"
#include "G3D/BinaryInput.h"
#include "G3D/TextInput.h"
#include "G3D/BinaryOutput.h"
#include "G3D/TextOutput.h"
#include "G3D/NetworkDevice.h"
namespace G3D {
void GUniqueID::serialize(BinaryOutput& b) const {
b.writeUInt64(id);
}
void GUniqueID::deserialize(BinaryInput& b) {
id = b.readUInt64();
}
void GUniqueID::serialize(TextOutput& t) const {
t.writeSymbol("(");
t.writeNumber((double)(id >> 32));
t.writeNumber((double)(id & 0xFFFFFFFF));
t.writeSymbol(")");
}
void GUniqueID::deserialize(TextInput& t) {
t.readSymbol("(");
id = (((uint64)t.readNumber()) << 32) + (uint64)t.readNumber();
t.readSymbol(")");
}
GUniqueID GUniqueID::create(uint16 tag) {
static uint64 counter = 0;
static uint64 systemID = 0;
if (systemID == 0) {
// Create a unique ID for this machine/program instance
// TODO: see ioctl(skfd, SIOCGIFHWADDR, &if_hwaddr)
Array<NetAddress> addr;
NetworkDevice::instance()->localHostAddresses(addr);
if (addr.size() > 0) {
systemID |= addr[0].ip();
}
union {
float64 ft;
uint64 ut;
};
ft = System::time();
systemID = ut << 22;
systemID ^= ((uint64)iRandom(0, 32768)) << 8;
systemID &= ~((uint64)1023 << 54);
// Ensure that the systemID is non-zero (vanishingly small probability)
if (systemID == 0) {
systemID = 1;
}
}
// No need for modulo; we'll all be dead before this counter
// overflows 54 bits
++counter;
GUniqueID i;
i.id = (((uint64)(tag & 1023)) << 54) | (counter ^ systemID);
return i;
}
} // G3D
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