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*LCK10-EX0:* Use of the noncompliant form of the double-checked locking idiom is permitted for 32-bit primitive values (for example, {{int}} or {{float}}) \[[Pugh 2004|AA. Bibliography#Pugh 04]\], although this usage is discouraged. The noncompliant form establishes the necessary happens-before relationship between threads that see an initialized version of the primitive value. The second happens-before relationship (that for the initialization of the fields of the referent) is moot, because unsynchronized reads and writes of primitive values up to 32-bits are guaranteed to be atomic. Consequently, the noncompliant form establishes the only needed happens-before relationship in this case. Note, however, that the noncompliant form fails for {{long}} or {{double}} because unsynchronized reads/writes of 64-bit primitives lack a guarantee of atomicity, and thusconsequently require a second happens-before relationship to guarantee that all threads see only fully assigned 64-bit values (See rule [VNA05-J. Ensure atomicity when reading and writing 64-bit values].) |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="092b03afd6cd1143-69149f58-41494064-83c79140-b7fd2454e412ee1b8aacbb53"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API 06]] |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="2c90a24a3a4c0d17-ce9b7256-495c411a-a201b09c-bc7313083b8a137ebcd19276"><ac:plain-text-body><![CDATA[ | [[JLS 2005 | AA. Bibliography#JLS 05]] | Section 12.4, "Initialization of Classes and Interfaces" | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="f95e8eed10794697-d90341e8-4e7243c7-bb279c38-16743073c14cd92130ea0c5d"><ac:plain-text-body><![CDATA[ | [[Pugh 2004 | AA. Bibliography#Pugh 04]] |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="79a74c08153cf5c4-cdf51b6a-44da4fa9-b527a263-70770af19cdd9e10a68a8e0c"><ac:plain-text-body><![CDATA[ | [[Bloch 2001 | AA. Bibliography#Bloch 01]] | Item 48: "Synchronize access to shared mutable data" | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="41a1aab06c2785c2-f48dd4bb-45904425-b40f805d-7600a07b9d36b4b2d46d711b"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch 08]] | Item 71: "Use lazy initialization judiciously"]]></ac:plain-text-body></ac:structured-macro> |
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