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Compound operations are operations that consist of more than one discrete operation. Expressions that include postfix or prefix increment ({{\+\+}}), postfix or prefix decrement ({{\-\-}}), or compound assignment operators always result in compound operations. Compound assignment expressions use operators such as {{\*=, /=, %=, \+=, \-=, <<=, >>=, >>>=, \^=}} and {{\|=}} \[[JLS 2005|AA. Bibliography#JLS 05]\]. Compound operations on shared variables must be performed atomically to prevent [data races|BB. Definitions#dataGlossary#data race] and [race conditions|BB. Definitions#raceGlossary#race conditions]. |
For information about the atomicity of a grouping of calls to independently atomic methods that belong to thread-safe classes, see rule VNA03-J. Do not assume that a group of calls to independently atomic methods is atomic.
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| §17.4.5, Happens-Before Order | ||||
| §17.4.3, Programs and Program Order | ||||
| §17.4.8, Executions and Causality Requirements | ||||
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| Section 2.1.1.1, Objects and Locks | ||||
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