"threadsafe" modifier in JAVA?

Question

I just came across a BNF Grammar for JAVA. In it, "modifier" has a terminal symbol called "threadsafe". However, I have never seen it before and have not been able to locate that modifier in The Java Language Specification, Java SE 7 Edition (docs.oracle.com/javase/specs/jls/se7/jls7.pdf). Yet, I found it here, describing it in bullet 16 as:

If another thread excuting this code at the same time can not change the value of a variable then the variable is threadsafe and the compiler may do clever things with it to make the code faster or smaller.

Is this a real modifier? Is it supposed to be introduced in upcomming versions of JAVA?

No, "threadsafe" is not a modifier. This is just made up stuff on the internet. — Ingo Kegel, Apr 26 '12 at 13:41
Made me chuckle when I read: "...the compiler may do clever things with it to make the code faster or smaller." — Martin Tuskevicius, Apr 26 '12 at 13:49
Mysterious, why (at least) two distinct universities propagate this non-existing modifier. — KoenigGunther, Apr 26 '12 at 14:06

score 2 · Accepted Answer · answered Apr 26 '12 at 13:43

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Try to find it here, at the official source of Java BNF.

answered Apr 26 '12 at 13:43

Marko Topolnik

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Thank you! Googling "Java BNF" directly led me to the mentioned University of Geneva's site. Looked trustworthy :) – KoenigGunther Apr 26 '12 at 14:02

score 0 · Answer 2 · edited Apr 27 '12 at 04:23

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No it's not, nor is private_protected in the same list.

edited Apr 27 '12 at 04:23

brian d foy

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answered Apr 26 '12 at 13:39

assylias

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score 0 · Answer 3 · answered Apr 27 '15 at 13:26

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Both Java and Groovy have keywords like "threadsafe" and "goto" as "reserved tokens" in the compiler, but they have no meaning right now in the language.

answered Apr 27 '15 at 13:26

Angel O'Sphere

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Any references for this? goto I know as it is mentioned in the docs http://docs.oracle.com/javase/tutorial/java/nutsandbolts/_keywords.html but never heard of threadsafe – Aseem Bansal Oct 17 '15 at 16:15

"threadsafe" modifier in JAVA?

3 Answers3