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std.Thread(windows): use NT internals for name fns

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viri 2022-01-15 17:40:45 -06:00
parent 12d6bcec02
commit 0bde55e881
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GPG Key ID: 70D2D3DF8F7FB7C3
3 changed files with 38 additions and 40 deletions
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60
lib/std/Thread.zig
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@ -4,6 +4,7 @@
const std = @import("std.zig");
const builtin = @import("builtin");
const math = std.math;
const os = std.os;
const assert = std.debug.assert;
const target = builtin.target;
@ -85,20 +86,28 @@ pub fn setName(self: Thread, name: []const u8) SetNameError!void {
try file.writer().writeAll(name);
return;
},
.windows => if (target.os.isAtLeast(.windows, .win10_rs1)) |res| {
// SetThreadDescription is only available since version 1607, which is 10.0.14393.795
// See https://en.wikipedia.org/wiki/Microsoft_Windows_SDK
if (!res) return error.Unsupported;
.windows => {
var buf: [max_name_len]u16 = undefined;
const len = try std.unicode.utf8ToUtf16Le(&buf, name);
const byte_len = math.cast(c_ushort, len * 2) catch return error.NameTooLong;
var name_buf_w: [max_name_len:0]u16 = undefined;
const length = try std.unicode.utf8ToUtf16Le(&name_buf_w, name);
name_buf_w[length] = 0;
// Note: NT allocates its own copy, no use-after-free here.
const unicode_string = os.windows.UNICODE_STRING{
.Length = byte_len,
.MaximumLength = byte_len,
.Buffer = &buf,
};
try os.windows.SetThreadDescription(
switch (os.windows.ntdll.NtSetInformationThread(
self.getHandle(),
@ptrCast(os.windows.LPWSTR, &name_buf_w),
);
return;
.ThreadNameInformation,
&unicode_string,
@sizeOf(os.windows.UNICODE_STRING),
)) {
.SUCCESS => return,
.NOT_IMPLEMENTED => return error.Unsupported,
else => |err| return os.windows.unexpectedStatus(err),
}
},
.macos, .ios, .watchos, .tvos => if (use_pthreads) {
// There doesn't seem to be a way to set the name for an arbitrary thread, only the current one.
@ -188,18 +197,25 @@ pub fn getName(self: Thread, buffer_ptr: *[max_name_len:0]u8) GetNameError!?[]co
// musl doesn't provide pthread_getname_np and there's no way to retrieve the thread id of an arbitrary thread.
return error.Unsupported;
},
.windows => if (target.os.isAtLeast(.windows, .win10_rs1)) |res| {
// GetThreadDescription is only available since version 1607, which is 10.0.14393.795
// See https://en.wikipedia.org/wiki/Microsoft_Windows_SDK
if (!res) return error.Unsupported;
.windows => {
const buf_capacity = @sizeOf(os.windows.UNICODE_STRING) + (@sizeOf(u16) * max_name_len);
var buf: [buf_capacity]u8 align(@alignOf(os.windows.UNICODE_STRING)) = undefined;
var name_w: os.windows.LPWSTR = undefined;
try os.windows.GetThreadDescription(self.getHandle(), &name_w);
defer os.windows.LocalFree(name_w);
const data_len = try std.unicode.utf16leToUtf8(buffer, std.mem.sliceTo(name_w, 0));
return if (data_len >= 1) buffer[0..data_len] else null;
switch (os.windows.ntdll.NtQueryInformationThread(
self.getHandle(),
.ThreadNameInformation,
&buf,
buf_capacity,
null,
)) {
.SUCCESS => {
const string = @ptrCast(*const os.windows.UNICODE_STRING, &buf);
const len = try std.unicode.utf16leToUtf8(buffer, string.Buffer[0 .. string.Length / 2]);
return if (len > 0) buffer[0..len] else null;
},
.NOT_IMPLEMENTED => return error.Unsupported,
else => |err| return os.windows.unexpectedStatus(err),
}
},
.macos, .ios, .watchos, .tvos => if (use_pthreads) {
const err = std.c.pthread_getname_np(self.getHandle(), buffer.ptr, max_name_len + 1);

15
lib/std/os/windows.zig
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@ -2029,21 +2029,6 @@ pub fn unexpectedStatus(status: NTSTATUS) std.os.UnexpectedError {
return error.Unexpected;
}
pub fn SetThreadDescription(hThread: HANDLE, lpThreadDescription: LPCWSTR) !void {
if (kernel32.SetThreadDescription(hThread, lpThreadDescription) == 0) {
switch (kernel32.GetLastError()) {
else => |err| return unexpectedError(err),
}
}
}
pub fn GetThreadDescription(hThread: HANDLE, ppszThreadDescription: *LPWSTR) !void {
if (kernel32.GetThreadDescription(hThread, ppszThreadDescription) == 0) {
switch (kernel32.GetLastError()) {
else => |err| return unexpectedError(err),
}
}
}
pub const Win32Error = @import("windows/win32error.zig").Win32Error;
pub const NTSTATUS = @import("windows/ntstatus.zig").NTSTATUS;
pub const LANG = @import("windows/lang.zig");

3
lib/std/os/windows/kernel32.zig
View File

@ -400,6 +400,3 @@ pub extern "kernel32" fn SleepConditionVariableSRW(
pub extern "kernel32" fn TryAcquireSRWLockExclusive(s: *SRWLOCK) callconv(WINAPI) BOOLEAN;
pub extern "kernel32" fn AcquireSRWLockExclusive(s: *SRWLOCK) callconv(WINAPI) void;
pub extern "kernel32" fn ReleaseSRWLockExclusive(s: *SRWLOCK) callconv(WINAPI) void;
pub extern "kernel32" fn SetThreadDescription(hThread: HANDLE, lpThreadDescription: LPCWSTR) callconv(WINAPI) HRESULT;
pub extern "kernel32" fn GetThreadDescription(hThread: HANDLE, ppszThreadDescription: *LPWSTR) callconv(WINAPI) HRESULT;