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Windows: correct Thread.stackSize computation #5306

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Windows: correct Thread.stackSize computation #5306

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799c171
Stack size returns an incorrect value
AZero13 Dec 10, 2025
f910589
Update Sources/Foundation/Thread.swift
AZero13 Dec 10, 2025
75e4a52
Update Thread.swift
AZero13 Dec 10, 2025
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8 changes: 7 additions & 1 deletion Sources/Foundation/Thread.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -323,10 +323,16 @@ open class Thread : NSObject {
#if os(Windows)
open var stackSize: Int {
get {
// If we set a stack size for this thread.
// Otherwise, query the actual limits.
guard _attr.dwThreadStackReservation == 0 else {
return Int(_attr.dwThreadStackReservation)
}
var ulLowLimit: ULONG_PTR = 0
var ulHighLimit: ULONG_PTR = 0
GetCurrentThreadStackLimits(&ulLowLimit, &ulHighLimit)
return Int(ulLowLimit)
// Return the reserved stack span.
return Int(ulHighLimit - ulLowLimit)
}
set {
_attr.dwThreadStackReservation = DWORD(newValue)
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