build: fail unsupported examples/benches on wasi during runtime

Author: Cloudef

bench/flow.zig

@@ -203,6 +203,7 @@ fn client(startup: *coro.ResetEvent, mode: ClientMode) !void {
 }
 
 pub fn main() !void {
+    if (builtin.target.os.tag == .wasi) return error.UnsupportedPlatform;
     var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};
     defer _ = gpa.deinit();
     const allocator = gpa.allocator();

bench/ping_pongs.zig

@@ -1,5 +1,6 @@
 // provided by mrjbq7
 
+const builtin = @import("builtin");
 const std = @import("std");
 const aio = @import("aio");
 const coro = @import("coro");
@@ -92,6 +93,7 @@ fn client(startup: *coro.ResetEvent) !void {
 }
 
 pub fn main() !void {
+    if (builtin.target.os.tag == .wasi) return error.UnsupportedPlatform;
     var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};
     defer _ = gpa.deinit();
     var scheduler = try coro.Scheduler.init(gpa.allocator(), .{});

build.zig

@@ -69,13 +69,14 @@ pub fn build(b: *std.Build) void {
         .coro,
         .coro_wttr,
     }) |example| {
+        const os = target.query.os_tag orelse builtin.os.tag;
         const exe = b.addExecutable(.{
             .name = @tagName(example),
             .root_source_file = b.path("examples/" ++ @tagName(example) ++ ".zig"),
             .target = target,
             .optimize = optimize,
             .sanitize_thread = sanitize,
-            .single_threaded = if (example == .coro_wttr) false else single_threaded,
+            .single_threaded = if (example == .coro_wttr and os != .wasi) false else single_threaded,
             .strip = false,
         });
         exe.root_module.addImport("aio", aio);

examples/coro.zig

@@ -1,3 +1,4 @@
+const builtin = @import("builtin");
 const std = @import("std");
 const aio = @import("aio");
 const coro = @import("coro");
@@ -81,6 +82,7 @@ fn client(startup: *coro.ResetEvent) !void {
 }
 
 pub fn main() !void {
+    if (builtin.target.os.tag == .wasi) return error.UnsupportedPlatform;
     // var mem: [4096 * 1024]u8 = undefined;
     // var fba = std.heap.FixedBufferAllocator.init(&mem);
     var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};

examples/coro_wttr.zig

@@ -66,6 +66,7 @@ fn loader(completed: *std.atomic.Value(u32), max: *const u32) !void {
 }
 
 pub fn main() !void {
+    if (builtin.target.os.tag == .wasi) return error.UnsupportedPlatform;
     var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};
     defer _ = gpa.deinit();
     const allocator = gpa.allocator();