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eth/downloader: fixes data race between synchronize and other methods (#21201)

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* eth/downloaded: fixed datarace between synchronize and Progress

There was a race condition between `downloader.synchronize()` and `Progress` `syncWithPeer` `fetchHeight` `findAncestors` and `processHeaders`
This PR changes the behavior of the downloader a bit.
Previously the functions `Progress` `syncWithPeer` `fetchHeight` `findAncestors` and `processHeaders` read the syncMode anew within their loops. Now they read the syncMode at the start of their function and don't change it during their runtime.

* eth/downloaded: comment

* eth/downloader: added comment
This commit is contained in:
Marius van der Wijden
2020-06-30 19:43:29 +02:00
committed by GitHub
parent 1e635bd0bd
commit d671dbd5b7
3 changed files with 38 additions and 27 deletions
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3
eth/downloader/modes.go
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@ -19,7 +19,8 @@ package downloader
import "fmt"
// SyncMode represents the synchronisation mode of the downloader.
type SyncMode int
// It is a uint32 as it is used with atomic operations.
type SyncMode uint32
const (
FullSync SyncMode = iota // Synchronise the entire blockchain history from full blocks