mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 06:13:07 +00:00
introduce Io.select and implement it in thread pool
This commit is contained in:
Andrew Kelley
parent
c4fcf85c43
commit
7aa4062f5c
223
lib/std/Io.zig
223
lib/std/Io.zig
@ -626,17 +626,21 @@ pub const VTable = struct {
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/// Thread-safe.
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cancelRequested: *const fn (?*anyopaque) bool,
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/// Blocks until one of the futures from the list has a result ready, such
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/// that awaiting it will not block. Returns that index.
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select: *const fn (?*anyopaque, futures: []const *AnyFuture) usize,
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mutexLock: *const fn (?*anyopaque, prev_state: Mutex.State, mutex: *Mutex) Cancelable!void,
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mutexUnlock: *const fn (?*anyopaque, prev_state: Mutex.State, mutex: *Mutex) void,
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conditionWait: *const fn (?*anyopaque, cond: *Condition, mutex: *Mutex) Cancelable!void,
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conditionWake: *const fn (?*anyopaque, cond: *Condition, wake: Condition.Wake) void,
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createFile: *const fn (?*anyopaque, dir: fs.Dir, sub_path: []const u8, flags: fs.File.CreateFlags) FileOpenError!fs.File,
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openFile: *const fn (?*anyopaque, dir: fs.Dir, sub_path: []const u8, flags: fs.File.OpenFlags) FileOpenError!fs.File,
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closeFile: *const fn (?*anyopaque, fs.File) void,
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pread: *const fn (?*anyopaque, file: fs.File, buffer: []u8, offset: std.posix.off_t) FilePReadError!usize,
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pwrite: *const fn (?*anyopaque, file: fs.File, buffer: []const u8, offset: std.posix.off_t) FilePWriteError!usize,
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createFile: *const fn (?*anyopaque, dir: Dir, sub_path: []const u8, flags: File.CreateFlags) File.OpenError!File,
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openFile: *const fn (?*anyopaque, dir: Dir, sub_path: []const u8, flags: File.OpenFlags) File.OpenError!File,
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closeFile: *const fn (?*anyopaque, File) void,
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pread: *const fn (?*anyopaque, file: File, buffer: []u8, offset: std.posix.off_t) File.PReadError!usize,
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pwrite: *const fn (?*anyopaque, file: File, buffer: []const u8, offset: std.posix.off_t) File.PWriteError!usize,
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now: *const fn (?*anyopaque, clockid: std.posix.clockid_t) ClockGetTimeError!Timestamp,
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sleep: *const fn (?*anyopaque, clockid: std.posix.clockid_t, deadline: Deadline) SleepError!void,
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@ -647,28 +651,118 @@ pub const Cancelable = error{
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Canceled,
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};
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pub const OpenFlags = fs.File.OpenFlags;
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pub const CreateFlags = fs.File.CreateFlags;
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pub const Dir = struct {
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handle: Handle,
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pub const FileOpenError = fs.File.OpenError || Cancelable;
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pub const FileReadError = fs.File.ReadError || Cancelable;
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pub const FilePReadError = fs.File.PReadError || Cancelable;
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pub const FileWriteError = fs.File.WriteError || Cancelable;
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pub const FilePWriteError = fs.File.PWriteError || Cancelable;
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pub fn cwd() Dir {
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return .{ .handle = std.fs.cwd().fd };
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}
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pub const Handle = std.posix.fd_t;
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pub fn openFile(dir: Dir, io: Io, sub_path: []const u8, flags: File.OpenFlags) File.OpenError!File {
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return io.vtable.openFile(io.userdata, dir, sub_path, flags);
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}
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pub fn createFile(dir: Dir, io: Io, sub_path: []const u8, flags: File.CreateFlags) File.OpenError!File {
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return io.vtable.createFile(io.userdata, dir, sub_path, flags);
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}
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pub const WriteFileOptions = struct {
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/// On Windows, `sub_path` should be encoded as [WTF-8](https://simonsapin.github.io/wtf-8/).
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/// On WASI, `sub_path` should be encoded as valid UTF-8.
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/// On other platforms, `sub_path` is an opaque sequence of bytes with no particular encoding.
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sub_path: []const u8,
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data: []const u8,
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flags: File.CreateFlags = .{},
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};
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pub const WriteFileError = File.WriteError || File.OpenError || Cancelable;
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/// Writes content to the file system, using the file creation flags provided.
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pub fn writeFile(dir: Dir, io: Io, options: WriteFileOptions) WriteFileError!void {
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var file = try dir.createFile(io, options.sub_path, options.flags);
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defer file.close(io);
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try file.writeAll(io, options.data);
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}
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};
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pub const File = struct {
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handle: Handle,
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pub const Handle = std.posix.fd_t;
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pub const OpenFlags = fs.File.OpenFlags;
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pub const CreateFlags = fs.File.CreateFlags;
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pub const OpenError = fs.File.OpenError || Cancelable;
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pub fn close(file: File, io: Io) void {
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return io.vtable.closeFile(io.userdata, file);
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}
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pub const ReadError = fs.File.ReadError || Cancelable;
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pub fn read(file: File, io: Io, buffer: []u8) ReadError!usize {
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return @errorCast(file.pread(io, buffer, -1));
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}
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pub const PReadError = fs.File.PReadError || Cancelable;
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pub fn pread(file: File, io: Io, buffer: []u8, offset: std.posix.off_t) PReadError!usize {
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return io.vtable.pread(io.userdata, file, buffer, offset);
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}
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pub const WriteError = fs.File.WriteError || Cancelable;
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pub fn write(file: File, io: Io, buffer: []const u8) WriteError!usize {
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return @errorCast(file.pwrite(io, buffer, -1));
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}
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pub const PWriteError = fs.File.PWriteError || Cancelable;
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pub fn pwrite(file: File, io: Io, buffer: []const u8, offset: std.posix.off_t) PWriteError!usize {
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return io.vtable.pwrite(io.userdata, file, buffer, offset);
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}
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pub fn writeAll(file: File, io: Io, bytes: []const u8) WriteError!void {
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var index: usize = 0;
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while (index < bytes.len) {
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index += try file.write(io, bytes[index..]);
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}
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}
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pub fn readAll(file: File, io: Io, buffer: []u8) ReadError!usize {
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var index: usize = 0;
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while (index != buffer.len) {
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const amt = try file.read(io, buffer[index..]);
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if (amt == 0) break;
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index += amt;
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}
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return index;
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}
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};
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pub const Timestamp = enum(i96) {
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_,
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pub fn durationTo(from: Timestamp, to: Timestamp) i96 {
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return @intFromEnum(to) - @intFromEnum(from);
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pub fn durationTo(from: Timestamp, to: Timestamp) Duration {
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return .{ .nanoseconds = @intFromEnum(to) - @intFromEnum(from) };
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}
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pub fn addDuration(from: Timestamp, duration: i96) Timestamp {
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return @enumFromInt(@intFromEnum(from) + duration);
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pub fn addDuration(from: Timestamp, duration: Duration) Timestamp {
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return @enumFromInt(@intFromEnum(from) + duration.nanoseconds);
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}
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};
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pub const Duration = struct {
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nanoseconds: i96,
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pub fn ms(x: u64) Duration {
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return .{ .nanoseconds = @as(i96, x) * std.time.ns_per_ms };
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}
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};
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pub const Deadline = union(enum) {
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nanoseconds: i96,
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duration: Duration,
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timestamp: Timestamp,
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};
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pub const ClockGetTimeError = std.posix.ClockGetTimeError || Cancelable;
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@ -1055,7 +1149,7 @@ pub fn Queue(Elem: type) type {
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/// Calls `function` with `args`, such that the return value of the function is
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/// not guaranteed to be available until `await` is called.
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pub fn async(io: Io, function: anytype, args: anytype) Future(@typeInfo(@TypeOf(function)).@"fn".return_type.?) {
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pub fn async(io: Io, function: anytype, args: std.meta.ArgsTuple(@TypeOf(function))) Future(@typeInfo(@TypeOf(function)).@"fn".return_type.?) {
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const Result = @typeInfo(@TypeOf(function)).@"fn".return_type.?;
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const Args = @TypeOf(args);
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const TypeErased = struct {
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@ -1079,7 +1173,7 @@ pub fn async(io: Io, function: anytype, args: anytype) Future(@typeInfo(@TypeOf(
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/// Calls `function` with `args` asynchronously. The resource cleans itself up
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/// when the function returns. Does not support await, cancel, or a return value.
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pub fn go(io: Io, function: anytype, args: anytype) void {
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pub fn go(io: Io, function: anytype, args: std.meta.ArgsTuple(@TypeOf(function))) void {
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const Args = @TypeOf(args);
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const TypeErased = struct {
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fn start(context: *const anyopaque) void {
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@ -1095,51 +1189,6 @@ pub fn go(io: Io, function: anytype, args: anytype) void {
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);
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}
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pub fn openFile(io: Io, dir: fs.Dir, sub_path: []const u8, flags: fs.File.OpenFlags) FileOpenError!fs.File {
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return io.vtable.openFile(io.userdata, dir, sub_path, flags);
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}
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pub fn createFile(io: Io, dir: fs.Dir, sub_path: []const u8, flags: fs.File.CreateFlags) FileOpenError!fs.File {
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return io.vtable.createFile(io.userdata, dir, sub_path, flags);
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}
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pub fn closeFile(io: Io, file: fs.File) void {
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return io.vtable.closeFile(io.userdata, file);
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}
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pub fn read(io: Io, file: fs.File, buffer: []u8) FileReadError!usize {
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return @errorCast(io.pread(file, buffer, -1));
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}
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pub fn pread(io: Io, file: fs.File, buffer: []u8, offset: std.posix.off_t) FilePReadError!usize {
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return io.vtable.pread(io.userdata, file, buffer, offset);
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}
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pub fn write(io: Io, file: fs.File, buffer: []const u8) FileWriteError!usize {
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return @errorCast(io.pwrite(file, buffer, -1));
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}
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pub fn pwrite(io: Io, file: fs.File, buffer: []const u8, offset: std.posix.off_t) FilePWriteError!usize {
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return io.vtable.pwrite(io.userdata, file, buffer, offset);
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}
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pub fn writeAll(io: Io, file: fs.File, bytes: []const u8) FileWriteError!void {
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var index: usize = 0;
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while (index < bytes.len) {
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index += try io.write(file, bytes[index..]);
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}
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}
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pub fn readAll(io: Io, file: fs.File, buffer: []u8) FileReadError!usize {
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var index: usize = 0;
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while (index != buffer.len) {
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const amt = try io.read(file, buffer[index..]);
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if (amt == 0) break;
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index += amt;
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}
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return index;
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}
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pub fn now(io: Io, clockid: std.posix.clockid_t) ClockGetTimeError!Timestamp {
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return io.vtable.now(io.userdata, clockid);
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}
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@ -1147,3 +1196,49 @@ pub fn now(io: Io, clockid: std.posix.clockid_t) ClockGetTimeError!Timestamp {
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pub fn sleep(io: Io, clockid: std.posix.clockid_t, deadline: Deadline) SleepError!void {
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return io.vtable.sleep(io.userdata, clockid, deadline);
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}
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pub fn sleepDuration(io: Io, duration: Duration) SleepError!void {
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return io.vtable.sleep(io.userdata, .MONOTONIC, .{ .duration = duration });
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}
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/// Given a struct with each field a `*Future`, returns a union with the same
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/// fields, each field type the future's result.
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pub fn SelectUnion(S: type) type {
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const struct_fields = @typeInfo(S).@"struct".fields;
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var fields: [struct_fields.len]std.builtin.Type.UnionField = undefined;
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for (&fields, struct_fields) |*union_field, struct_field| {
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const F = @typeInfo(struct_field.type).pointer.child;
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const Result = @TypeOf(@as(F, undefined).result);
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union_field.* = .{
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.name = struct_field.name,
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.type = Result,
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.alignment = struct_field.alignment,
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};
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}
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return @Type(.{ .@"union" = .{
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.layout = .auto,
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.tag_type = std.meta.FieldEnum(S),
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.fields = &fields,
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.decls = &.{},
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} });
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}
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/// `s` is a struct with every field a `*Future(T)`, where `T` can be any type,
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/// and can be different for each field.
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pub fn select(io: Io, s: anytype) SelectUnion(@TypeOf(s)) {
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const U = SelectUnion(@TypeOf(s));
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const S = @TypeOf(s);
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const fields = @typeInfo(S).@"struct".fields;
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var futures: [fields.len]*AnyFuture = undefined;
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inline for (fields, &futures) |field, *any_future| {
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const future = @field(s, field.name);
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any_future.* = future.any_future orelse return @unionInit(U, field.name, future.result);
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}
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switch (io.vtable.select(io.userdata, &futures)) {
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inline 0...(fields.len - 1) => |selected_index| {
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const field_name = fields[selected_index].name;
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return @unionInit(U, field_name, @field(s, field_name).await(io));
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},
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else => unreachable,
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}
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}
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@ -335,6 +335,7 @@ pub fn io(pool: *Pool) Io {
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.go = go,
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.cancel = cancel,
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.cancelRequested = cancelRequested,
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.select = select,
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.mutexLock = mutexLock,
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.mutexUnlock = mutexUnlock,
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@ -358,10 +359,13 @@ const AsyncClosure = struct {
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func: *const fn (context: *anyopaque, result: *anyopaque) void,
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runnable: Runnable = .{ .runFn = runFn },
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reset_event: std.Thread.ResetEvent,
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select_condition: ?*std.Thread.ResetEvent,
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cancel_tid: std.Thread.Id,
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context_offset: usize,
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result_offset: usize,
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const done_reset_event: *std.Thread.ResetEvent = @ptrFromInt(std.mem.alignBackward(usize, std.math.maxInt(usize), @alignOf(std.Thread.ResetEvent)));
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const canceling_tid: std.Thread.Id = switch (@typeInfo(std.Thread.Id)) {
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.int => |int_info| switch (int_info.signedness) {
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.signed => -1,
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@ -396,6 +400,17 @@ const AsyncClosure = struct {
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.acq_rel,
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.acquire,
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)) |cancel_tid| assert(cancel_tid == canceling_tid);
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if (@atomicRmw(
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?*std.Thread.ResetEvent,
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&closure.select_condition,
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.Xchg,
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done_reset_event,
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.release,
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)) |select_reset| {
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assert(select_reset != done_reset_event);
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select_reset.set();
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}
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closure.reset_event.set();
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}
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@ -455,6 +470,7 @@ fn @"async"(
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.result_offset = result_offset,
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.reset_event = .{},
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.cancel_tid = 0,
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.select_condition = null,
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};
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@memcpy(closure.contextPointer()[0..context.len], context);
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pool.run_queue.prepend(&closure.runnable.node);
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@ -720,47 +736,54 @@ fn conditionWake(userdata: ?*anyopaque, cond: *Io.Condition, wake: Io.Condition.
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fn createFile(
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userdata: ?*anyopaque,
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dir: std.fs.Dir,
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dir: Io.Dir,
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sub_path: []const u8,
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flags: std.fs.File.CreateFlags,
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) Io.FileOpenError!std.fs.File {
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flags: Io.File.CreateFlags,
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) Io.File.OpenError!Io.File {
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const pool: *std.Thread.Pool = @alignCast(@ptrCast(userdata));
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try pool.checkCancel();
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return dir.createFile(sub_path, flags);
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const fs_dir: std.fs.Dir = .{ .fd = dir.handle };
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const fs_file = try fs_dir.createFile(sub_path, flags);
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return .{ .handle = fs_file.handle };
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}
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fn openFile(
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userdata: ?*anyopaque,
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dir: std.fs.Dir,
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dir: Io.Dir,
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sub_path: []const u8,
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flags: std.fs.File.OpenFlags,
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) Io.FileOpenError!std.fs.File {
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flags: Io.File.OpenFlags,
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) Io.File.OpenError!Io.File {
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const pool: *std.Thread.Pool = @alignCast(@ptrCast(userdata));
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try pool.checkCancel();
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return dir.openFile(sub_path, flags);
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const fs_dir: std.fs.Dir = .{ .fd = dir.handle };
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const fs_file = try fs_dir.openFile(sub_path, flags);
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return .{ .handle = fs_file.handle };
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}
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fn closeFile(userdata: ?*anyopaque, file: std.fs.File) void {
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fn closeFile(userdata: ?*anyopaque, file: Io.File) void {
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const pool: *std.Thread.Pool = @alignCast(@ptrCast(userdata));
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_ = pool;
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return file.close();
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const fs_file: std.fs.File = .{ .handle = file.handle };
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return fs_file.close();
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}
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fn pread(userdata: ?*anyopaque, file: std.fs.File, buffer: []u8, offset: std.posix.off_t) Io.FilePReadError!usize {
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fn pread(userdata: ?*anyopaque, file: Io.File, buffer: []u8, offset: std.posix.off_t) Io.File.PReadError!usize {
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const pool: *std.Thread.Pool = @alignCast(@ptrCast(userdata));
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try pool.checkCancel();
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const fs_file: std.fs.File = .{ .handle = file.handle };
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return switch (offset) {
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-1 => file.read(buffer),
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else => file.pread(buffer, @bitCast(offset)),
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-1 => fs_file.read(buffer),
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else => fs_file.pread(buffer, @bitCast(offset)),
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};
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}
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fn pwrite(userdata: ?*anyopaque, file: std.fs.File, buffer: []const u8, offset: std.posix.off_t) Io.FilePWriteError!usize {
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fn pwrite(userdata: ?*anyopaque, file: Io.File, buffer: []const u8, offset: std.posix.off_t) Io.File.PWriteError!usize {
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const pool: *std.Thread.Pool = @alignCast(@ptrCast(userdata));
|
||||
try pool.checkCancel();
|
||||
const fs_file: std.fs.File = .{ .handle = file.handle };
|
||||
return switch (offset) {
|
||||
-1 => file.write(buffer),
|
||||
else => file.pwrite(buffer, @bitCast(offset)),
|
||||
-1 => fs_file.write(buffer),
|
||||
else => fs_file.pwrite(buffer, @bitCast(offset)),
|
||||
};
|
||||
}
|
||||
|
||||
@ -774,7 +797,7 @@ fn now(userdata: ?*anyopaque, clockid: std.posix.clockid_t) Io.ClockGetTimeError
|
||||
fn sleep(userdata: ?*anyopaque, clockid: std.posix.clockid_t, deadline: Io.Deadline) Io.SleepError!void {
|
||||
const pool: *std.Thread.Pool = @alignCast(@ptrCast(userdata));
|
||||
const deadline_nanoseconds: i96 = switch (deadline) {
|
||||
.nanoseconds => |nanoseconds| nanoseconds,
|
||||
.duration => |duration| duration.nanoseconds,
|
||||
.timestamp => |timestamp| @intFromEnum(timestamp),
|
||||
};
|
||||
var timespec: std.posix.timespec = .{
|
||||
@ -784,7 +807,7 @@ fn sleep(userdata: ?*anyopaque, clockid: std.posix.clockid_t, deadline: Io.Deadl
|
||||
while (true) {
|
||||
try pool.checkCancel();
|
||||
switch (std.os.linux.E.init(std.os.linux.clock_nanosleep(clockid, .{ .ABSTIME = switch (deadline) {
|
||||
.nanoseconds => false,
|
||||
.duration => false,
|
||||
.timestamp => true,
|
||||
} }, ×pec, ×pec))) {
|
||||
.SUCCESS => return,
|
||||
@ -795,3 +818,35 @@ fn sleep(userdata: ?*anyopaque, clockid: std.posix.clockid_t, deadline: Io.Deadl
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn select(userdata: ?*anyopaque, futures: []const *Io.AnyFuture) usize {
|
||||
const pool: *std.Thread.Pool = @alignCast(@ptrCast(userdata));
|
||||
_ = pool;
|
||||
|
||||
var reset_event: std.Thread.ResetEvent = .{};
|
||||
|
||||
for (futures, 0..) |future, i| {
|
||||
const closure: *AsyncClosure = @ptrCast(@alignCast(future));
|
||||
if (@atomicRmw(?*std.Thread.ResetEvent, &closure.select_condition, .Xchg, &reset_event, .seq_cst) == AsyncClosure.done_reset_event) {
|
||||
for (futures[0..i]) |cleanup_future| {
|
||||
const cleanup_closure: *AsyncClosure = @ptrCast(@alignCast(cleanup_future));
|
||||
if (@atomicRmw(?*std.Thread.ResetEvent, &cleanup_closure.select_condition, .Xchg, null, .seq_cst) == AsyncClosure.done_reset_event) {
|
||||
cleanup_closure.reset_event.wait(); // Ensure no reference to our stack-allocated reset_event.
|
||||
}
|
||||
}
|
||||
return i;
|
||||
}
|
||||
}
|
||||
|
||||
reset_event.wait();
|
||||
|
||||
var result: ?usize = null;
|
||||
for (futures, 0..) |future, i| {
|
||||
const closure: *AsyncClosure = @ptrCast(@alignCast(future));
|
||||
if (@atomicRmw(?*std.Thread.ResetEvent, &closure.select_condition, .Xchg, null, .seq_cst) == AsyncClosure.done_reset_event) {
|
||||
closure.reset_event.wait(); // Ensure no reference to our stack-allocated reset_event.
|
||||
if (result == null) result = i; // In case multiple are ready, return first.
|
||||
}
|
||||
}
|
||||
return result.?;
|
||||
}
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user