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data race [ISO/IEC 9899:2011]
The execution of a program contains a data race if it contains two conflicting actions in different threads, at least one of which is not atomic, and neither happens before the other. Any such data race results in undefined behavior.
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Anchor diagnostic message diagnostic message
diagnostic message [ISO/IEC 9899:2011]
A diagnostic message is a message belonging to an implementation-defined subset of the implementation’s message output. A diagnostic message may indicate a constraint violation or a valid but questionable language construct. Messages typically include the file name and line number pointing to the offending code construct. In addition, implementations also often indicate the severity of the problem. Although the C Standard does not specify any such requirement, the most severe problems often cause implementations to fail to fully translate a translation unit. Diagnostics output in such cases are termed errors. Other problems may cause implementations simply to issue a warning message and continue translating the rest of the program. See error message and warning message.
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