From d8a1fa899e54d084c91de2875355f12dc50aadc7 Mon Sep 17 00:00:00 2001
From: Stephen Celis <stephen@stephencelis.com>
Date: Tue, 28 May 2024 12:26:52 -0700
Subject: [PATCH] wip

---
 Sources/Perception/Internal/ThreadLocal.swift | 21 +++++++------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/Sources/Perception/Internal/ThreadLocal.swift b/Sources/Perception/Internal/ThreadLocal.swift
index b6ac346..059184b 100644
--- a/Sources/Perception/Internal/ThreadLocal.swift
+++ b/Sources/Perception/Internal/ThreadLocal.swift
@@ -11,19 +11,14 @@
 
 import Foundation
 
-@_silgen_name("_swift_observation_tls_get")
-func _tlsGet() -> UnsafeMutableRawPointer?
-
-@_silgen_name("_swift_observation_tls_set")
-func _tlsSet(_ value: UnsafeMutableRawPointer?)
-
 struct _ThreadLocal {
-  static var value: UnsafeMutableRawPointer? {
-    get {
-      _tlsGet()
-    }
-    set {
-      _tlsSet(newValue)
+  #if os(WASI)
+    static var value: UnsafeMutableRawPointer?
+  #else
+    static var value: UnsafeMutableRawPointer? {
+      get { Thread.current.threadDictionary[Key()] as! UnsafeMutableRawPointer? }
+      set { Thread.current.threadDictionary[Key()] = newValue }
     }
-  }
+    private struct Key: Hashable {}
+  #endif
 }