fn free(userdata: *anyopaque, memory: []u8, alignment: std.mem.Alignment, ret_addr: usize) void 656
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662fn free(userdata: *anyopaque, memory: []u8, alignment: std.mem.Alignment, ret_addr: usize) void {
const ev: *Evented = @ptrCast(@alignCast(userdata));
const ev_io = ev.io();
ev.backing_allocator_mutex.lockUncancelable(ev_io);
defer ev.backing_allocator_mutex.unlock(ev_io);
return ev.backing_allocator.rawFree(memory, alignment, ret_addr);
}