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Improved threadsafety for FileIndexTable.FileToIndex #18137

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merged 4 commits into from
Dec 13, 2024
Merged

Improved threadsafety for FileIndexTable.FileToIndex #18137

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844e2ec
Improved threadsafety for FileIndexTable.FileToIndex
KevinRansom Dec 13, 2024
92a2707
Fix typo
KevinRansom Dec 13, 2024
47bd824
baselines
KevinRansom Dec 13, 2024
c692e30
Merge branch 'main' into FileIndexTable.FileToIndex
KevinRansom Dec 13, 2024
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42 changes: 20 additions & 22 deletions src/Compiler/Utilities/range.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -196,31 +196,29 @@ type FileIndexTable() =
match fileToIndexTable.TryGetValue filePath with
| true, idx -> idx
| _ ->
// If a write operation can happen, we have to lock the whole read-check-write to avoid race conditions
lock fileToIndexTable
<| fun () ->
match fileToIndexTable.TryGetValue filePath with
| true, idx -> idx
| _ ->

// Try again looking for a normalized entry.
let normalizedFilePath =
if normalize then
FileSystem.NormalizePathShim filePath
else
filePath
// Try again looking for a normalized entry.
let normalizedFilePath =
if normalize then
FileSystem.NormalizePathShim filePath
else
filePath

match fileToIndexTable.TryGetValue normalizedFilePath with
| true, idx ->
// Record the non-normalized entry if necessary
if filePath <> normalizedFilePath then
fileToIndexTable[filePath] <- idx
match fileToIndexTable.TryGetValue normalizedFilePath with
| true, idx ->
// Record the non-normalized entry if necessary
if filePath <> normalizedFilePath then
fileToIndexTable[filePath] <- idx

// Return the index
idx
// Return the index
idx

| _ ->
lock indexToFileTable (fun () ->
// See if it was added on another thread
match fileToIndexTable.TryGetValue normalizedFilePath with
| true, idx -> idx
| _ ->
// Get the new index
// Okay it's really not there
let idx = indexToFileTable.Count

// Record the normalized entry
Expand All @@ -232,7 +230,7 @@ type FileIndexTable() =
fileToIndexTable[filePath] <- idx

// Return the index
idx
idx)

member t.IndexToFile n =
if n < 0 then
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