Fatal error: concurrent map writes Does this happen only for writes

Question

Go

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Fatal error: concurrent map writes Does this happen only for writes

and reads are ok?

0

23.11.2020

7 ответов

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ㅤ Автор вопроса

Roman Sharkov
context please?

generally I'm curious about the whole mutexes and concurrent access, does the panic occur upon writing at the same time? And it doesn't happen upon reading?

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23.11.2020

Roman Sharkov

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generally I'm curious about the whole mutexes and ...

where did you get this error from?!

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23.11.2020

ㅤ Автор вопроса

Roman Sharkov
where did you get this error from?!

oh, an example to produce concurrent access error: func main() { m := make(map[string]int, 1) m[`foo`] = 1 var wg sync.WaitGroup wg.Add(2) go func() { for i := 0; i < 1000; i++ { m[`foo`]++ } }() go func() { for i := 0; i < 1000; i++ { m[`foo`]++ } }() wg.Wait() }

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23.11.2020

Roman Sharkov

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oh, an example to produce concurrent access error:...

ya you shouldn’t do that

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23.11.2020

Ernesto A. Santana 🇨🇺

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oh, an example to produce concurrent access error:...

you need to use a sync.Mutex or user sync.Map if your concurrent is only write

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23.11.2020