From c155ac50c25c871ea80f27688d2361a3a0bc24d6 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 21 Jan 2026 21:42:23 -0800
Subject: [PATCH] std.Io.Threaded: don't pass null to NtDelayExecution

Windows returns ACCESS_VIOLATION if you do that.
---
 lib/std/Io/Threaded.zig      | 5 +++--
 lib/std/os/windows/ntdll.zig | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 7d1ad99231aacbf81d349ede9b85d25d9b35bcca..96a5d648eedfec47b31715d804c3e424cc76d3de 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -8301,6 +8301,7 @@ fn fileReadStreamingWindows(file: File, data: []const []u8) File.Reader.Error!us
 
     var io_status_block: windows.IO_STATUS_BLOCK = undefined;
     var done: bool = false;
+    const infinite: windows.LARGE_INTEGER = windows.INFINITE;
 
     read: {
         const syscall: Syscall = try .start();
@@ -8329,7 +8330,7 @@ fn fileReadStreamingWindows(file: File, data: []const []u8) File.Reader.Error!us
         }
         try syscall.toApc(.{ .handle = file.handle, .iosb = &io_status_block });
         while (true) {
-            switch (windows.ntdll.NtDelayExecution(1, null)) {
+            switch (windows.ntdll.NtDelayExecution(1, &infinite)) {
                 .USER_APC => {
                     if (!done) {
                         // Other APC work was queued before calling into this function.
@@ -8338,7 +8339,7 @@ fn fileReadStreamingWindows(file: File, data: []const []u8) File.Reader.Error!us
                     }
                     break syscall.finishApc();
                 },
-                .SUCCESS, .CANCELLED => {
+                .SUCCESS, .CANCELLED, .TIMEOUT, .ALERTED => {
                     try syscall.checkCancelApc();
                     continue;
                 },
diff --git a/lib/std/os/windows/ntdll.zig b/lib/std/os/windows/ntdll.zig
index ce70cb0f37547231370e580950f4d338bf05cf00..c9d9b5ef0ebe5709046de05bf2ea4ea770e3b7a0 100644
--- a/lib/std/os/windows/ntdll.zig
+++ b/lib/std/os/windows/ntdll.zig
@@ -591,7 +591,7 @@ pub extern "ntdll" fn NtCancelSynchronousIoFile(
 
 pub extern "ntdll" fn NtDelayExecution(
     Alertable: BOOLEAN,
-    DelayInterval: ?*const LARGE_INTEGER,
+    DelayInterval: *const LARGE_INTEGER,
 ) callconv(.winapi) NTSTATUS;
 
 pub extern "ntdll" fn NtCancelIoFileEx(
-- 
2.54.0