diff --git a/lua/lazy/async.lua b/lua/lazy/async.lua
new file mode 100644
index 0000000..a7bcfac
--- /dev/null
+++ b/lua/lazy/async.lua
@@ -0,0 +1,107 @@
+---@class AsyncOpts
+---@field on_done? fun()
+---@field on_error? fun(err:string)
+---@field on_yield? fun(res:any)
+
+local M = {}
+
+---@type Async[]
+M._queue = {}
+M._executor = assert(vim.loop.new_check())
+M._running = false
+
+---@class Async
+---@field co thread
+---@field opts AsyncOpts
+local Async = {}
+
+---@param fn async fun()
+---@param opts? AsyncOpts
+---@return Async
+function Async.new(fn, opts)
+  local self = setmetatable({}, { __index = Async })
+  self.co = coroutine.create(fn)
+  self.opts = opts or {}
+  return self
+end
+
+function Async:running()
+  return coroutine.status(self.co) ~= "dead"
+end
+
+function Async:step()
+  local status = coroutine.status(self.co)
+  if status == "suspended" then
+    local ok, res = coroutine.resume(self.co)
+    if not ok then
+      if self.opts.on_error then
+        self.opts.on_error(tostring(res))
+      end
+    elseif res then
+      if self.opts.on_yield then
+        self.opts.on_yield(res)
+      end
+    end
+  end
+  if self:running() then
+    return true
+  end
+  if self.opts.on_done then
+    self.opts.on_done()
+  end
+end
+
+function M.step()
+  M._running = true
+  local budget = 1 * 1e6
+  local start = vim.loop.hrtime()
+  local count = #M._queue
+  local i = 0
+  while #M._queue > 0 and vim.loop.hrtime() - start < budget do
+    ---@type Async
+    local state = table.remove(M._queue, 1)
+    if state:step() then
+      table.insert(M._queue, state)
+    end
+    i = i + 1
+    if i >= count then
+      break
+    end
+  end
+  M._running = false
+  if #M._queue == 0 then
+    return M._executor:stop()
+  end
+end
+
+---@param async Async
+function M.add(async)
+  table.insert(M._queue, async)
+  if not M._executor:is_active() then
+    M._executor:start(vim.schedule_wrap(M.step))
+  end
+  return async
+end
+
+---@param fn async fun()
+---@param opts? AsyncOpts
+function M.run(fn, opts)
+  return M.add(Async.new(fn, opts))
+end
+
+---@generic T: async fun()
+---@param fn T
+---@param opts? AsyncOpts
+---@return T
+function M.wrap(fn, opts)
+  return function(...)
+    local args = { ... }
+    ---@async
+    local wrapped = function()
+      return fn(unpack(args))
+    end
+    return M.run(wrapped, opts)
+  end
+end
+
+return M
diff --git a/lua/lazy/manage/task/init.lua b/lua/lazy/manage/task/init.lua
index 9c2d179..5a9079d 100644
--- a/lua/lazy/manage/task/init.lua
+++ b/lua/lazy/manage/task/init.lua
@@ -1,3 +1,4 @@
+local Async = require("lazy.async")
 local Process = require("lazy.manage.process")
 
 ---@class LazyTaskDef
@@ -6,44 +7,6 @@ local Process = require("lazy.manage.process")
 
 ---@alias LazyTaskState {task:LazyTask, thread:thread}
 
-local Scheduler = {}
----@type LazyTaskState[]
-Scheduler._queue = {}
-Scheduler._executor = assert(vim.loop.new_check())
-Scheduler._running = false
-
-function Scheduler.step()
-  Scheduler._running = true
-  local budget = 1 * 1e6
-  local start = vim.loop.hrtime()
-  local count = #Scheduler._queue
-  local i = 0
-  while #Scheduler._queue > 0 and vim.loop.hrtime() - start < budget do
-    ---@type LazyTaskState
-    local state = table.remove(Scheduler._queue, 1)
-    state.task:_step(state.thread)
-    if coroutine.status(state.thread) ~= "dead" then
-      table.insert(Scheduler._queue, state)
-    end
-    i = i + 1
-    if i >= count then
-      break
-    end
-  end
-  Scheduler._running = false
-  if #Scheduler._queue == 0 then
-    return Scheduler._executor:stop()
-  end
-end
-
----@param state LazyTaskState
-function Scheduler.add(state)
-  table.insert(Scheduler._queue, state)
-  if not Scheduler._executor:is_active() then
-    Scheduler._executor:start(vim.schedule_wrap(Scheduler.step))
-  end
-end
-
 ---@class LazyTask
 ---@field plugin LazyPlugin
 ---@field name string
@@ -55,7 +18,7 @@ end
 ---@field private _started? number
 ---@field private _ended? number
 ---@field private _opts TaskOptions
----@field private _threads thread[]
+---@field private _running Async[]
 local Task = {}
 
 ---@class TaskOptions: {[string]:any}
@@ -70,7 +33,7 @@ function Task.new(plugin, name, task, opts)
     __index = Task,
   })
   self._opts = opts or {}
-  self._threads = {}
+  self._running = {}
   self._task = task
   self._started = nil
   self.plugin = plugin
@@ -137,34 +100,31 @@ end
 
 ---@param fn async fun()
 function Task:async(fn)
-  local co = coroutine.create(fn)
-  table.insert(self._threads, co)
-  Scheduler.add({ task = self, thread = co })
-end
-
----@param co thread
-function Task:_step(co)
-  local status = coroutine.status(co)
-  if status == "suspended" then
-    local ok, res = coroutine.resume(co)
-    if not ok then
-      self:notify_error(tostring(res))
-    elseif res then
-      self:notify(tostring(res))
-    end
-  end
-  for _, t in ipairs(self._threads) do
-    if coroutine.status(t) ~= "dead" then
-      return
-    end
-  end
-  self:_done()
+  local async = Async.run(fn, {
+    on_done = function()
+      self:_done()
+    end,
+    on_error = function(err)
+      self:notify_error(err)
+    end,
+    on_yield = function(res)
+      self:notify(res)
+    end,
+  })
+  table.insert(self._running, async)
 end
 
 ---@private
 function Task:_done()
   assert(self:has_started(), "task not started")
   assert(not self:has_ended(), "task already done")
+
+  for _, t in ipairs(self._running) do
+    if t:running() then
+      return
+    end
+  end
+
   self._ended = vim.uv.hrtime()
   if self._opts.on_done then
     self._opts.on_done(self)