Raise DEFAULT_MIN_STACK_SIZE to at least 64KiB

Prevent copy-paste errors from producing new starved-for-resources threaded platforms by raising `DEFAULT_MIN_STACK_SIZE` from 4096 bytes to at least 64KiB. Two platforms "affected" by this have no actual threads: - UEFI - "unsupported" Platforms that this actually affects: - wasm32-wasi with "atomics" enabled - wasm32-wasi-p1-threads Two exceptions: - SGX: a "secure code execution" platform, stays at 4096B - TEEOS: also a "secure code execution" platform, stays at 8192B I believe either of these may have sufficiently "interesting" semantics around threads, or significant external library support. Either would mean making any choices here for them is suspect.

Author: workingjubilee

std/src/sys/pal/uefi/thread.rs

@@ -7,7 +7,7 @@ use crate::time::Duration;
 
 pub struct Thread(!);
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
+pub const DEFAULT_MIN_STACK_SIZE: usize = 64 * 1024;
 
 impl Thread {
  // unsafe: see thread::Builder::spawn_unchecked for safety requirements

std/src/sys/pal/unsupported/thread.rs

@@ -6,7 +6,7 @@ use crate::time::Duration;
 
 pub struct Thread(!);
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
+pub const DEFAULT_MIN_STACK_SIZE: usize = 64 * 1024;
 
 impl Thread {
  // unsafe: see thread::Builder::spawn_unchecked for safety requirements

std/src/sys/pal/wasi/thread.rs

@@ -66,7 +66,7 @@ cfg_if::cfg_if! {
  }
 }
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
+pub const DEFAULT_MIN_STACK_SIZE: usize = 64 * 1024;
 
 impl Thread {
  // unsafe: see thread::Builder::spawn_unchecked for safety requirements

std/src/sys/pal/wasm/atomics/thread.rs

@@ -6,7 +6,7 @@ use crate::time::Duration;
 
 pub struct Thread(!);
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
+pub const DEFAULT_MIN_STACK_SIZE: usize = 64 * 1024;
 
 impl Thread {
  // unsafe: see thread::Builder::spawn_unchecked for safety requirements