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Don't round stack size up for created threads in Windows #94618

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Mar 5, 2022
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Don't round stack size up for created threads in Windows #94618

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5 changes: 1 addition & 4 deletions library/std/src/sys/windows/thread.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -28,12 +28,9 @@ impl Thread {
// PTHREAD_STACK_MIN bytes big. Windows has no such lower limit, it's
// just that below a certain threshold you can't do anything useful.
// That threshold is application and architecture-specific, however.
// Round up to the next 64 kB because that's what the NT kernel does,
// might as well make it explicit.
let stack_size = (stack + 0xfffe) & (!0xfffe);
let ret = c::CreateThread(
ptr::null_mut(),
stack_size,
stack,
thread_start,
p as *mut _,
c::STACK_SIZE_PARAM_IS_A_RESERVATION,
Expand Down