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### Thread safety <a id="iostreams.threadsafety">[[iostreams.threadsafety]]</a>
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Concurrent access to a stream object
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[[file.streams]]), stream buffer object
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[[iostream.objects]]).
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[*Note 1*: Data races result in undefined behavior
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[[intro.multithread]]
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If one thread makes a library call *a* that writes a value to a stream
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and, as a result, another thread reads this value from the stream
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through a library call *b* such that this does not result in a data
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race, then *a*’s write synchronizes with *b*’s read.
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### Thread safety <a id="iostreams.threadsafety">[[iostreams.threadsafety]]</a>
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Concurrent access to a stream object ([[string.streams]],
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[[file.streams]]), stream buffer object [[stream.buffers]], or C Library
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stream [[c.files]] by multiple threads may result in a data race
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[[intro.multithread]] unless otherwise specified [[iostream.objects]].
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[*Note 1*: Data races result in undefined behavior
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[[intro.multithread]]. — *end note*]
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If one thread makes a library call *a* that writes a value to a stream
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and, as a result, another thread reads this value from the stream
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through a library call *b* such that this does not result in a data
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race, then *a*’s write synchronizes with *b*’s read.
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