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Fix % used in PerCoreLockedStacks #55959

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merged 2 commits into from
Jul 20, 2021
Merged

Fix % used in PerCoreLockedStacks #55959

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a37c9fc
Fix % used in PerCoreLockedStacks
stephentoub Jul 19, 2021
e197673
Address PR feedback
stephentoub Jul 20, 2021
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4 changes: 2 additions & 2 deletions ...ibraries/System.Private.CoreLib/src/System/Buffers/TlsOverPerCoreLockedStacksArrayPool.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -281,7 +281,7 @@ public bool TryPush(T[] array)
// Try to push on to the associated stack first. If that fails,
// round-robin through the other stacks.
LockedStack[] stacks = _perCoreStacks;
int index = Thread.GetCurrentProcessorId() % stacks.Length;
int index = (int)((uint)Thread.GetCurrentProcessorId() % (uint)s_lockedStackCount); // mod by constant in tier 1
for (int i = 0; i < stacks.Length; i++)
{
if (stacks[index].TryPush(array)) return true;
Expand All @@ -298,7 +298,7 @@ public bool TryPush(T[] array)
// Try to pop from the associated stack first. If that fails, round-robin through the other stacks.
T[]? arr;
LockedStack[] stacks = _perCoreStacks;
int index = Thread.GetCurrentProcessorId() % s_lockedStackCount; // when ProcessorCount is a power of two, the JIT can optimize this in tier 1
int index = (int)((uint)Thread.GetCurrentProcessorId() % (uint)s_lockedStackCount); // mod by constant in tier 1
for (int i = 0; i < stacks.Length; i++)
{
if ((arr = stacks[index].TryPop()) is not null) return arr;
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