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- Welcome to lesson nine, data races.

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This is where we start
learning important topics

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around synchronization and orchestration,

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but we're really gonna focus
around synchronization here.

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These are the two things
you have to worry about

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as a multi-threaded software developer,

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synchronization and orchestration,

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and data races are one of these places

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where it is the nastiest
bugs you ever wanna have.

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This is where we've got
at least two go routines

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where one's doing a read
and one is doing a write

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at the same time, at the
same memory location.

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This is bad.

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So I'm gonna show off some data races,

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I'm gonna show off the race detector tool,

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I'm gonna show you ways
using atomic and mutexes

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to fix those data races,
and we're gonna learn

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a little bit more about
our mechanical sympathies

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for how the hardware works.