wip non linux support

build.zig

@@ -4,11 +4,16 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
+    var opts = b.addOptions();
+    const fallback = b.option(bool, "fallback", "use fallback event loop") orelse false;
+    opts.addOption(bool, "fallback", fallback);
+
     const aio = b.addModule("aio", .{
         .root_source_file = b.path("src/aio.zig"),
         .target = target,
         .optimize = optimize,
     });
+    aio.addImport("build_options", opts.createModule());
 
     const coro = b.addModule("coro", .{
         .root_source_file = b.path("src/coro.zig"),
@@ -20,7 +25,7 @@ pub fn build(b: *std.Build) void {
     const run_all = b.step("run", "Run all examples");
     inline for (.{
         .aio_dynamic,
-        .aio_static,
+        .aio_immediate,
         .coro,
     }) |example| {
         const exe = b.addExecutable(.{
@@ -39,13 +44,16 @@ pub fn build(b: *std.Build) void {
         run_all.dependOn(&cmd.step);
     }
 
+    const test_filter = b.option([]const u8, "test-filter", "Skip tests that do not match any filter") orelse "";
     const test_step = b.step("test", "Run unit tests");
     inline for (.{ .aio, .coro }) |mod| {
         const tst = b.addTest(.{
             .root_source_file = b.path("src/" ++ @tagName(mod) ++ ".zig"),
             .target = target,
             .optimize = optimize,
+            .filters = &.{test_filter},
         });
+        if (mod == .aio) tst.root_module.addImport("build_options", opts.createModule());
         if (mod == .coro) tst.root_module.addImport("aio", aio);
         const run = b.addRunArtifact(tst);
         test_step.dependOn(&run.step);

docs/pages/aio-immediate.mdx

@@ -29,14 +29,17 @@ var my_buffer: [1024]u8 = undefined;
 var my_len: usize = undefined;
 
 try aio.multi(.{
-    aio.Write{.file = f, .buffer = "contents", .link_next = true},
+    aio.Write{.file = f, .buffer = "contents", .link = .soft},
     aio.Read{.file = f, .buffer = &my_buffer, .out_read = &my_len},
 });
 ```
 
-The `.link_next` field of operation can be used to link the operation to the next operation.
+The `.link` field of operation can be used to link the operation to the next operation.
 When linking operations, the next operation won't start until this operation is complete.
 
+`soft` link will propagate failure to next operations in the link chain.
+`hard` link will not propagate failure, and the next operation starts normally.
+
 #### Using complete
 
 Complete is similar to multi, but it will not return `error.SomeOperationFailed` in case any of the operations fail.
@@ -51,7 +54,7 @@ var write_error: std.posix.WriteError = undefined;
 var read_error: std.posix.ReadError = undefined;
 
 const res = try aio.complete(.{
-    aio.Write{.file = f, .buffer = "contents", .out_error = &write_error, .link_next = true},
+    aio.Write{.file = f, .buffer = "contents", .out_error = &write_error, .link = .soft},
     aio.Read{.file = f, .buffer = &my_buffer, .out_error = &read_error, .out_read = &my_len},
 });
 

docs/pages/aio-operations.mdx

@@ -24,12 +24,18 @@ link_next: bool = false,
 
 If `out_id` is set, the id of the operation will be stored into that address immediately after sucessful queue.
 The `id` can then be used in future operations to refer to this operation.
+
+
 If `out_error` is set, the error of the operation will be stored into that address, in case the operation failed.
 If there was no failure a `error.Success` will be stored in that address.
 `counter` can be used to set either decreasing or increasing counter.
 When operation completes it will either decrease or increase the `u16` stored at the address.
-`link_next` can be used to link the next operation into this operation.
+
+
+`link` can be used to link the next operation into this operation.
 When operations are linked, the next operation won't start until this operation has completed first.
+`soft` link will propagate failure to next operations in the link chain.
+`hard` link will not propagate failure, and the next operation starts normally.
 
 ### Fsync
 
@@ -144,13 +150,12 @@ ns: i128,
 ### LinkTimeout
 
 Timeout linked to a operation.
-The operation before must have set `link_next` to `true`.
+The operation before must have set `link` to either `soft` or `hard`.
 If the operation finishes before the timeout, then the timeout will be canceled.
 If the timeout finishes before the operation, then the operation will be canceled.
 
 ```zig
 ns: i128,
-out_expired: ?*bool = null,
 ```
 
 ### Cancel

docs/pages/coro-blocking-code.mdx

@@ -19,12 +19,13 @@ fn task(pool: *ThreadPool) !void {
     try std.testing.expectEqual(69, ret);
 }
 
+var scheduler = try Scheduler.init(std.testing.allocator, .{});
+defer scheduler.deinit();
+
 var pool: ThreadPool = .{};
 defer pool.deinit(); // pool must always be destroyed before scheduler
 try pool.start(std.testing.allocator, 0);
 
-var scheduler = try Scheduler.init(std.testing.allocator, .{});
-defer scheduler.deinit();
 _ = try scheduler.spawn(task, .{&pool}, .{});
 try scheduler.run();
 ```

docs/pages/coro-context-switches.mdx

@@ -10,10 +10,12 @@ coro.yield(SomeEnum.value);
 ```
 
 To continue running the task from where it left, you need to issue the same enum value to the following function.
-If the task currently isn't being yielded in the supplied state, the call is no-op.
+If you specify the third parameter as `.wait`, the current task will yield (or block if not a task) until the
+target task yields to that particural state. If instead third parameter is `.no_wait` then if the task currently
+isn't being yielded in the supplied state, the call is a no-op.
 
 ```zig
-coro.wakeupFromState(task, SomeEnum.value);
+coro.wakeupFromState(task, SomeEnum.value, .wait);
 ```
 
 This is the preferred way to handle the control flow between tasks.

docs/pages/index.mdx

@@ -7,7 +7,7 @@ title: 'zig-aio: io_uring like asynchronous API and coroutine powered IO tasks f
 zig-aio provides io_uring like asynchronous API and coroutine powered IO tasks for zig
 
 ```zig
-// [!include ~/../examples/aio_static.zig]
+// [!include ~/../examples/aio_immediate.zig]
 ```
 
 ## Features

examples/aio_dynamic.zig

@@ -30,9 +30,12 @@ pub fn main() !void {
         },
     });
 
-    const ret = try work.complete(.blocking);
+    var num_work: u16 = 2;
+    while (num_work > 0) {
+        const ret = try work.complete(.blocking);
+        num_work -= ret.num_completed;
+    }
 
     log.info("{s}", .{buf[0..len]});
     log.info("{s}", .{buf2[0..len2]});
-    log.info("{}", .{ret});
 }

examples/aio_static.zig → examples/aio_immediate.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 const aio = @import("aio");
-const log = std.log.scoped(.aio_static);
+const log = std.log.scoped(.aio_immediate);
 
 pub fn main() !void {
     var f = try std.fs.cwd().openFile("flake.nix", .{});

examples/coro.zig

@@ -26,24 +26,24 @@ fn server(client_task: coro.Task) !void {
     try std.posix.bind(socket, &address.any, address.getOsSockLen());
     try std.posix.listen(socket, 128);
 
-    coro.wakeupFromState(client_task, Yield.server_ready);
+    coro.wakeupFromState(client_task, Yield.server_ready, .wait);
 
     var client_sock: std.posix.socket_t = undefined;
     try coro.io.single(aio.Accept{ .socket = socket, .out_socket = &client_sock });
 
     var buf: [1024]u8 = undefined;
     var len: usize = 0;
     try coro.io.multi(.{
-        aio.Send{ .socket = client_sock, .buffer = "hey ", .link_next = true },
-        aio.Send{ .socket = client_sock, .buffer = "I'm doing multiple IO ops at once ", .link_next = true },
-        aio.Send{ .socket = client_sock, .buffer = "how cool is that? ", .link_next = true },
+        aio.Send{ .socket = client_sock, .buffer = "hey ", .link = .soft },
+        aio.Send{ .socket = client_sock, .buffer = "I'm doing multiple IO ops at once ", .link = .soft },
+        aio.Send{ .socket = client_sock, .buffer = "how cool is that? ", .link = .soft },
         aio.Recv{ .socket = client_sock, .buffer = &buf, .out_read = &len },
     });
 
     log.warn("got reply from client: {s}", .{buf[0..len]});
     try coro.io.multi(.{
-        aio.Send{ .socket = client_sock, .buffer = "ok bye", .link_next = true },
-        aio.CloseSocket{ .socket = client_sock, .link_next = true },
+        aio.Send{ .socket = client_sock, .buffer = "ok bye", .link = .soft },
+        aio.CloseSocket{ .socket = client_sock, .link = .soft },
         aio.CloseSocket{ .socket = socket },
     });
 }
@@ -64,7 +64,6 @@ fn client() !void {
         .socket = socket,
         .addr = &address.any,
         .addrlen = address.getOsSockLen(),
-        .link_next = true,
     });
 
     while (true) {

flake.nix

@@ -11,7 +11,9 @@
       # Zig flake helper
       # Check the flake.nix in zig2nix project for more options:
       # <https://github.com/Cloudef/zig2nix/blob/master/flake.nix>
-      env = zig2nix.outputs.zig-env.${system} { zig = zig2nix.outputs.packages.${system}.zig.master.bin; };
+      env = zig2nix.outputs.zig-env.${system} {
+        zig = zig2nix.outputs.packages.${system}.zig.master.bin;
+      };
       system-triple = env.lib.zigTripleFromString system;
     in with builtins; with env.lib; with env.pkgs.lib; rec {
       # nix run .