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1 | sclass FasterFlag is Runnable {
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2 | private volatile boolean up; |
3 | |
4 | /** returns true if flag was down before (i.e. flag was actually raised right now) */ |
5 | public bool raise() {
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6 | if (up) false; |
7 | synchronized {
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8 | if (up) false; |
9 | up = true; |
10 | notifyAll(); |
11 | true; |
12 | } |
13 | } |
14 | |
15 | run { raise(); }
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16 | |
17 | public void waitUntilUp() ctex {
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18 | if (up) ret; |
19 | synchronized {
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20 | while (!up) wait(); |
21 | } |
22 | } |
23 | |
24 | public bool waitUntilUp(double timeout) {
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25 | if (timeout == infinity()) {
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26 | waitUntilUp(); |
27 | ret isUp(); |
28 | } else |
29 | ret waitUntilUp(toMS(timeout)); |
30 | } |
31 | |
32 | public bool waitUntilUp(long timeout) ctex {
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33 | if (up) ret true; |
34 | synchronized {
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35 | if (!up) |
36 | wait(timeout); |
37 | } |
38 | ret isUp(); |
39 | } |
40 | |
41 | public bool isUp aka get() { ret up; }
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42 | |
43 | toString { ret isUp() ? "up" : "down"; }
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44 | } |
Began life as a copy of #1000915
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| Snippet ID: | #1035583 |
| Snippet name: | FasterFlag - Flag using double-checked locking (now merged into Flag) |
| Eternal ID of this version: | #1035583/4 |
| Text MD5: | 9cb52b784b350ceb7685e19fe5c6b6a3 |
| Transpilation MD5: | 723c32b1803240b6fe871ecaf4b617cc |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2022-06-20 21:37:13 |
| Source code size: | 878 bytes / 44 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 70 / 108 |
| Version history: | 3 change(s) |
| Referenced in: | [show references] |