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std.Io.Threaded: implement mmap fallback for Windows

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This commit is contained in:
Andrew Kelley
2026-01-15 10:14:03 -08:00
parent 3c708b19fe
commit 8527ec9c7b
1 changed files with 23 additions and 5 deletions
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lib/std/Io/Threaded.zig
+23 -5
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@@ -8153,14 +8153,17 @@ fn fileReadPositionalWindows(userdata: ?*anyopaque, file: File, data: []const []
const t: *Threaded = @ptrCast(@alignCast(userdata));
_ = t;
const DWORD = windows.DWORD;
var index: usize = 0;
while (index < data.len and data[index].len == 0) index += 1;
if (index == data.len) return 0;
const buffer = data[index];
const want_read_count: DWORD = @min(std.math.maxInt(DWORD), buffer.len);
return readFilePositionalWindows(file, buffer, offset);
}
fn readFilePositionalWindows(file: File, buffer: []u8, offset: u64) File.ReadPositionalError!usize {
const DWORD = windows.DWORD;
const want_read_count: DWORD = @min(std.math.maxInt(DWORD), buffer.len);
var overlapped: windows.OVERLAPPED = .{
.Internal = 0,
.InternalHigh = 0,
@@ -16478,7 +16481,17 @@ fn fileMemoryMapWrite(userdata: ?*anyopaque, mm: *File.MemoryMap) File.WritePosi
fn mmSyncRead(file: File, memory: []u8, offset: u64) File.ReadPositionalError!void {
if (is_windows) {
@panic("TODO");
var i: usize = 0;
while (true) {
const buf = memory[i..];
if (buf.len == 0) break;
const n = try readFilePositionalWindows(file, buf, offset + i);
if (n == 0) {
@memset(memory[i..], 0);
break;
}
i += n;
}
} else if (native_os == .wasi and !builtin.link_libc) {
var i: usize = 0;
const syscall: Syscall = try .start();
@@ -16569,7 +16582,12 @@ fn mmSyncRead(file: File, memory: []u8, offset: u64) File.ReadPositionalError!vo
fn mmSyncWrite(file: File, memory: []u8, offset: u64) File.WritePositionalError!void {
if (is_windows) {
@panic("TODO");
var i: usize = 0;
while (true) {
const buf = memory[i..];
if (buf.len == 0) break;
i += try writeFilePositionalWindows(file.handle, memory[i..], offset + i);
}
} else if (native_os == .wasi and !builtin.link_libc) {
var i: usize = 0;
var n: usize = undefined;