fix: replace channel impl
This commit is contained in:
229
src/lib.zig
229
src/lib.zig
@@ -1,106 +1,187 @@
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const std = @import("std");
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const Log2Int = std.math.Log2Int;
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const Allocator = std.mem.Allocator;
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const EmuMessage = enum { Pause, Resume, Quit };
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const GuiMessage = enum { Paused, Quit };
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// TODO: Rewrite
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// pub const TwoWayChannel = struct {
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// const Self = @This();
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pub const TwoWayChannel = struct {
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const Self = @This();
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// emu: Channel(EmuMessage),
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// gui: Channel(GuiMessage),
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emu: Channel(EmuMessage),
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gui: Channel(GuiMessage),
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// pub fn init(items: []u8) Self {
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// comptime std.debug.assert(@sizeOf(EmuMessage) == @sizeOf(GuiMessage));
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// comptime std.debug.assert(@sizeOf(@typeInfo([]u8).Pointer.child) == @sizeOf(EmuMessage));
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pub fn init(items: []u8) Self {
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comptime std.debug.assert(@sizeOf(EmuMessage) == @sizeOf(GuiMessage));
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comptime std.debug.assert(@sizeOf(@typeInfo([]u8).Pointer.child) == @sizeOf(EmuMessage));
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// std.debug.assert(items.len % 2 == 0);
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std.debug.assert(items.len % 2 == 0);
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// const left = @ptrCast([*]EmuMessage, items)[0 .. items.len / 2];
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// const right = @ptrCast([*]GuiMessage, items)[items.len / 2 .. items.len];
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const left = @ptrCast([*]EmuMessage, items)[0 .. items.len / 2];
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const right = @ptrCast([*]GuiMessage, items)[items.len / 2 .. items.len];
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// return .{ .emu = Channel(EmuMessage).init(left), .gui = Channel(GuiMessage).init(right) };
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// }
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// };
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return .{ .emu = Channel(EmuMessage).init(left), .gui = Channel(GuiMessage).init(right) };
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}
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};
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fn Channel(comptime T: type) type {
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pub fn Channel(comptime T: type, comptime N: usize) type {
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return struct {
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const Self = @This();
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const Index = usize;
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const capacity_limit = (@as(Index, 1) << @typeInfo(Index).Int.bits - 1) - 1; // half the range of index type
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const Atomic = std.atomic.Atomic;
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tx: Sender,
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rx: Receiver,
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const max_capacity = (@as(Index, 1) << @typeInfo(Index).Int.bits - 1) - 1; // half the range of index type
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const log = std.log.scoped(.Channel);
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pub const Sender = struct {
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const Self = @This();
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read: Atomic(Index),
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write: Atomic(Index),
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buf: []T,
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read: *Index,
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write: *Index,
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ptr: *[N]T,
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const Error = error{buffer_full};
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const Error = error{buffer_full};
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pub fn init(buf: []T) Self {
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std.debug.assert(std.math.isPowerOfTwo(buf.len)); // capacity must be a power of two
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std.debug.assert(buf.len <= max_capacity);
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pub fn send(self: Self, value: T) void {
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const idx_r = @atomicLoad(Index, self.read, .Acquire);
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const idx_w = @atomicLoad(Index, self.write, .Acquire);
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// Check to see if Queue is full
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if (idx_w - idx_r == N) @panic("Channel: Buffer is full");
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self.ptr[mask(idx_w)] = value;
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std.atomic.fence(.Release);
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@atomicStore(Index, self.write, idx_w + 1, .Release);
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}
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pub fn len(self: Self) Index {
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const idx_r = @atomicLoad(Index, self.read, .Acquire);
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const idx_w = @atomicLoad(Index, self.write, .Acquire);
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return idx_w - idx_r;
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}
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};
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pub const Receiver = struct {
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const Self = @This();
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read: *Index,
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write: *Index,
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ptr: *[N]T,
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pub fn recv(self: Self) ?T {
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const idx_r = @atomicLoad(Index, self.read, .Acquire);
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const idx_w = @atomicLoad(Index, self.write, .Acquire);
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if (idx_r == idx_w) return null;
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std.atomic.fence(.Acquire);
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const value = self.ptr[mask(idx_r)];
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std.atomic.fence(.Release);
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@atomicStore(Index, self.read, idx_r + 1, .Release);
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return value;
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}
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pub fn peek(self: Self) ?T {
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const idx_r = @atomicLoad(Index, self.read, .Acquire);
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const idx_w = @atomicLoad(Index, self.write, .Acquire);
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if (idx_r == idx_w) return null;
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std.atomic.fence(.Acquire);
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return self.ptr[mask(idx_r)];
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}
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pub fn len(self: Self) Index {
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const idx_r = @atomicLoad(Index, self.read, .Acquire);
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const idx_w = @atomicLoad(Index, self.write, .Acquire);
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return idx_w - idx_r;
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}
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};
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fn mask(idx: Index) Index {
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return idx & (@intCast(Index, N) - 1);
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}
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pub fn init(allocator: Allocator) !Channel(T, N) {
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const buf = try allocator.alloc(T, N);
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const indicies = try allocator.alloc(Index, 2);
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return .{
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.read = Atomic(Index).init(0),
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.write = Atomic(Index).init(0),
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.buf = buf,
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.tx = Sender{
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.ptr = buf[0..N],
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.read = &indicies[0],
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.write = &indicies[1],
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},
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.rx = Receiver{
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.ptr = buf[0..N],
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.read = &indicies[0],
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.write = &indicies[1],
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},
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};
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}
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pub fn push(self: *Self, value: T) void {
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const read_idx = self.read.load(.Acquire);
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const write_idx = self.write.load(.Acquire);
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pub fn deinit(self: *Channel(T, N), allocator: Allocator) void {
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const indicies: []Index = @ptrCast([*]Index, self.tx.read)[0..2];
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// Check to see if Queue is full
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if (write_idx - read_idx == self.buf.len) @panic("Channel: Buffer is full");
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allocator.free(indicies);
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allocator.free(self.tx.ptr);
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self.buf[self.mask(write_idx)] = value;
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std.atomic.fence(.Release);
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self.write.store(write_idx + 1, .Release);
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self.* = undefined;
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}
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pub fn pop(self: *Self) ?T {
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const read_idx = self.read.load(.Acquire);
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const write_idx = self.write.load(.Acquire);
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if (read_idx == write_idx) return null;
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std.atomic.fence(.Acquire);
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const value = self.buf[self.mask(read_idx)];
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std.atomic.fence(.Release);
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self.read.store(read_idx + 1, .Release);
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return value;
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}
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pub fn peek(self: *const Self) ?T {
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const read_idx = self.read.load(.Acquire);
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const write_idx = self.write.load(.Acquire);
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if (read_idx == write_idx) return null;
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std.atomic.fence(.Acquire);
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return self.buf[self.mask(read_idx)];
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}
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pub fn len(self: *const Self) Index {
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const read_idx = self.read.load(.Acquire);
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const write_idx = self.write.load(.Acquire);
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return write_idx - read_idx;
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}
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fn mask(self: *const Self, idx: Index) Index {
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return idx & (self.buf.len - 1);
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comptime {
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std.debug.assert(std.math.isPowerOfTwo(N));
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std.debug.assert(N <= capacity_limit);
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}
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};
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}
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test "Channel init + deinit" {
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var ch = try Channel(u8, 64).init(std.testing.allocator);
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defer ch.deinit(std.testing.allocator);
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}
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test "Channel basic queue" {
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var ch = try Channel(u8, 64).init(std.testing.allocator);
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defer ch.deinit(std.testing.allocator);
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ch.tx.send(128);
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try std.testing.expectEqual(@as(?u8, 128), ch.rx.recv());
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}
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test "Channel basic multithreaded" {
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const builtin = @import("builtin");
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if (builtin.single_threaded)
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return error.SkipZigTest;
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const run_tx = struct {
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fn run(tx: anytype) void {
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tx.send(128);
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}
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}.run;
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const run_rx = struct {
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fn run(rx: anytype) !void {
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while (rx.recv()) |value| {
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try std.testing.expectEqual(@as(?u8, 128), value);
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}
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}
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}.run;
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var ch = try Channel(u8, 64).init(std.testing.allocator);
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defer ch.deinit(std.testing.allocator);
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const tx_handle = try std.Thread.spawn(.{}, run_tx, .{&ch.tx});
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defer tx_handle.join();
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const rx_handle = try std.Thread.spawn(.{}, run_rx, .{&ch.rx});
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defer rx_handle.join();
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}
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pub fn RingBuffer(comptime T: type) type {
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return struct {
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const Self = @This();
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