pthread.zig

const std = @import("std");
const c = std.c;

fn ahi(val: ?*anyopaque) callconv(.C) ?*anyopaque {
    const p = @as(*u32, @ptrCast(@alignCast(val)));
    std.debug.print("val 0x{x}\n", .{p.*});
    return p;
}

pub fn main() !void {
    var tid: c.pthread_t = undefined;
    var x: u32 = 0xdead;
    var p: ?*anyopaque = undefined;

    _ = c.pthread_create(&tid, null, ahi, &x);
    _ = c.pthread_join(tid, @as(?*?*anyopaque, &p));
    const xp = @as(*u32, @ptrCast(@alignCast(p)));
    std.debug.print("y = 0x{x}\n", .{xp.*});
}