1033 |
|
return cancelWaiter(node, null, false); |
1034 |
|
node.thread = Thread.currentThread(); |
1035 |
|
if (node.prev == p && p.status == WAITING && // recheck |
1036 |
< |
(p != whead || (state & ABITS) != 0L)) { |
1036 |
> |
(p != whead || (state & ABITS) != 0L)) |
1037 |
|
U.park(false, time); |
1038 |
– |
if (interruptible && Thread.interrupted()) |
1039 |
– |
return cancelWaiter(node, null, true); |
1040 |
– |
} |
1038 |
|
node.thread = null; |
1039 |
+ |
if (interruptible && Thread.interrupted()) |
1040 |
+ |
return cancelWaiter(node, null, true); |
1041 |
|
} |
1042 |
|
} |
1043 |
|
} |
1100 |
|
node.cowait = p.cowait, node)) { |
1101 |
|
node.thread = Thread.currentThread(); |
1102 |
|
for (long time;;) { |
1103 |
+ |
if (interruptible && Thread.interrupted()) |
1104 |
+ |
return cancelWaiter(node, p, true); |
1105 |
|
if (deadline == 0L) |
1106 |
|
time = 0L; |
1107 |
|
else if ((time = deadline - System.nanoTime()) <= 0L) |
1116 |
|
if (node.thread == null) // must recheck |
1117 |
|
break; |
1118 |
|
U.park(false, time); |
1118 |
– |
if (interruptible && Thread.interrupted()) |
1119 |
– |
return cancelWaiter(node, p, true); |
1119 |
|
} |
1120 |
|
group = p; |
1121 |
|
} |
1173 |
|
return cancelWaiter(node, null, false); |
1174 |
|
node.thread = Thread.currentThread(); |
1175 |
|
if (node.prev == p && p.status == WAITING && |
1176 |
< |
(p != whead || (state & ABITS) != WBIT)) { |
1176 |
> |
(p != whead || (state & ABITS) != WBIT)) |
1177 |
|
U.park(false, time); |
1179 |
– |
if (interruptible && Thread.interrupted()) |
1180 |
– |
return cancelWaiter(node, null, true); |
1181 |
– |
} |
1178 |
|
node.thread = null; |
1179 |
+ |
if (interruptible && Thread.interrupted()) |
1180 |
+ |
return cancelWaiter(node, null, true); |
1181 |
|
} |
1182 |
|
} |
1183 |
|
} |
1184 |
|
|
1187 |
– |
/** |
1188 |
– |
* If node non-null, forces cancel status and unsplices from queue |
1189 |
– |
* if possible. This is a variant of cancellation methods in |
1190 |
– |
* AbstractQueuedSynchronizer (see its detailed explanation in AQS |
1191 |
– |
* internal documentation) that more conservatively wakes up other |
1192 |
– |
* threads that may have had their links changed, so as to preserve |
1193 |
– |
* liveness in the main signalling methods. |
1194 |
– |
*/ |
1195 |
– |
private long cancelWaiter(WNode node, WNode group, boolean interrupted) { |
1196 |
– |
if (node != null) { |
1197 |
– |
node.thread = null; |
1198 |
– |
node.status = CANCELLED; |
1199 |
– |
if (group != null) { |
1200 |
– |
for (WNode p = group, q; p != null; p = q) { |
1201 |
– |
if ((q = p.cowait) != null && q.status == CANCELLED) { |
1202 |
– |
U.compareAndSwapObject(p, WCOWAIT, q, q.cowait); |
1203 |
– |
break; |
1204 |
– |
} |
1205 |
– |
} |
1206 |
– |
} |
1207 |
– |
else { |
1208 |
– |
for (WNode pred = node.prev; pred != null; ) { |
1209 |
– |
WNode succ, pp; Thread w; |
1210 |
– |
while ((succ = node.next) == null || |
1211 |
– |
succ.status == CANCELLED) { |
1212 |
– |
WNode q = null; |
1213 |
– |
for (WNode t = wtail; t != null && t != node; t = t.prev) |
1214 |
– |
if (t.status != CANCELLED) |
1215 |
– |
q = t; |
1216 |
– |
if (succ == q || |
1217 |
– |
U.compareAndSwapObject(node, WNEXT, |
1218 |
– |
succ, succ = q)) { |
1219 |
– |
if (succ == null && node == wtail) |
1220 |
– |
U.compareAndSwapObject(this, WTAIL, node, pred); |
1221 |
– |
break; |
1222 |
– |
} |
1223 |
– |
} |
1224 |
– |
if (pred.next == node) |
1225 |
– |
U.compareAndSwapObject(pred, WNEXT, node, succ); |
1226 |
– |
if (succ != null && (w = succ.thread) != null) |
1227 |
– |
U.unpark(w); |
1228 |
– |
if (pred.status != CANCELLED || (pp = pred.prev) == null) |
1229 |
– |
break; |
1230 |
– |
node.prev = pp; // repeat for new pred |
1231 |
– |
U.compareAndSwapObject(pp, WNEXT, pred, succ); |
1232 |
– |
pred = pp; |
1233 |
– |
} |
1234 |
– |
} |
1235 |
– |
} |
1236 |
– |
release(whead); |
1237 |
– |
return (interrupted || Thread.interrupted()) ? INTERRUPTED : 0L; |
1238 |
– |
} |
1239 |
– |
|
1240 |
– |
// Unsafe mechanics |
1241 |
– |
private static final sun.misc.Unsafe U; |
1242 |
– |
private static final long STATE; |
1243 |
– |
private static final long WHEAD; |
1244 |
– |
private static final long WTAIL; |
1245 |
– |
private static final long WNEXT; |
1246 |
– |
private static final long WSTATUS; |
1247 |
– |
private static final long WCOWAIT; |
1248 |
– |
|
1249 |
– |
static { |
1250 |
– |
try { |
1251 |
– |
U = getUnsafe(); |
1252 |
– |
Class<?> k = StampedLock.class; |
1253 |
– |
Class<?> wk = WNode.class; |
1254 |
– |
STATE = U.objectFieldOffset |
1255 |
– |
(k.getDeclaredField("state")); |
1256 |
– |
WHEAD = U.objectFieldOffset |
1257 |
– |
(k.getDeclaredField("whead")); |
1258 |
– |
WTAIL = U.objectFieldOffset |
1259 |
– |
(k.getDeclaredField("wtail")); |
1260 |
– |
WSTATUS = U.objectFieldOffset |
1261 |
– |
(wk.getDeclaredField("status")); |
1262 |
– |
WNEXT = U.objectFieldOffset |
1263 |
– |
(wk.getDeclaredField("next")); |
1264 |
– |
WCOWAIT = U.objectFieldOffset |
1265 |
– |
(wk.getDeclaredField("cowait")); |
1266 |
– |
|
1267 |
– |
} catch (Exception e) { |
1268 |
– |
throw new Error(e); |
1269 |
– |
} |
1270 |
– |
} |
1271 |
– |
|
1185 |
|
/** |
1186 |
|
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
1187 |
|
* Replace with a simple call to Unsafe.getUnsafe when integrating |