perf: use waitgroup instead of loop to wait on timers

* feat: add hilbish.job.add function

this is mainly to accomodate for the employer
handler (#152)

* feat!: add start function to jobs

the commit itself adds a few things but the
main purpose is to facilitate a lua side start
function that can restart the job

there is a breaking change in the hilbish.job.add
function; it is now required to provide an extra
table for arguments, since the first cmd
table isnt really what's actually ran

* fix: reuse standard files for jobs

* fix: deadlock in lua job add function and not taking proper amount of args

* fix: assign binary path to job

* feat: emit job.add hook when job is added

* chore: update modules

* fix: use setpgid on cmd procattr for background jobs

* fix: use right procattr on correct os

* fix: set bg proc attr in build tagged file

* feat: add disown function

* fix: stop jobs on exit

* feat: add disown command

* feat: add jobs.last function to get last job

* feat: make disown command get last job if id isnt suppied as arg

* chore: remove unused code

* feat: add job output

* chore: fix comments

* fix!: make exec path in job add explicit in lua side

* docs: add docs and changelogs relating to jobs

CHANGELOG.md

@@ -23,6 +23,26 @@ is for everything/anything as opposed to just adding a single command completion
 [#122](https://github.com/Rosettea/Hilbish/issues/122)
 - `fs.abs(path)` to get absolute path.
 - Nature module (`doc nature`)
+- `hilbish.jobs.add(cmdstr, args, execPath)` to add a job to the job table.
+`cmdstr` would be user input, `args` is the args for the command (includes arg0)
+and `execPath` is absolute path to command executable
+- `job.add` hook is thrown when a job is added. acts as a unique hook for
+jobs
+- `hilbish.jobs.disown(id)` and `disown` builtin to disown a job. `disown`
+without arguments will disown the last job.
+- `hilbish.jobs.last()` returns the last added job.
+- Job output (stdout/stderr) can now be obtained via the `stdout` and `stderr`
+fields on a job object.
+- Documentation for jobs is now available via `doc jobs`.
+- `hilbish.alias.resolve(cmdstr)` to resolve a command alias.
+- `hilbish.opts` for shell options. Currently, the only opt is `autocd`.
+- `hilbish.editor` interface for interacting with the line editor that
+Hilbish uses.
+- `hilbish.vim` interface to dynamically get/set vim registers.
+Example usage: `hilbish.vim.registers['a'] = 'hello'`. You can also
+get the mode with it via `hilbish.vim.mode`
+- `hilbish.version` interface for more info about Hilbish's version. This
+includes git commit, branch, and (new!!) release name.
 
 ### Changed
 - **Breaking Change:** Upgraded to Lua 5.4.
@@ -33,6 +53,7 @@ This is probably one of (if not the) biggest things in this release.
 user input, exit code, and error. User input has been added to the return to
 account for runners wanting to prompt for continued input, and to add it
 properly to history.
+- All `fs` module functions which take paths now implicitly expand ~ to home.
 
 ### Fixed
 - If in Vim replace mode, input at the end of the line inserts instead of
@@ -57,6 +78,16 @@ certain color rules.
 - Cursor position with CJK characters. ([#145](https://github.com/Rosettea/Hilbish/pull/145))
 - Files with same name as parent folder in completions getting cut off [#136](https://github.com/Rosettea/Hilbish/issues/136))
 - `hilbish.which` now works with commanders and aliases.
+- Background jobs no longer take stdin so they do not interfere with shell
+input.
+- Completions are fixed in cases where the query/line is an alias alone
+where it can also resolve to the beginning of command names.
+(reference [this commit](https://github.com/Rosettea/Hilbish/commit/2790982ad123115c6ddbc5764677fdca27668cea))
+for explanation.
+- Jobs now throw `job.done` and set running to false when stopped via
+Lua `job.stop` function.
+- Jobs are always started in sh exec handler now instead of only successful start.
+- SIGTERM is handled properly now, which means stopping jobs and timers.
 
 ## [1.2.0] - 2022-03-17
 ### Added

docs/hooks/job.txt

@@ -1,11 +1,5 @@
-Note: A `job` is a table with the following keys:
-- cmd: command string
-- running: boolean whether the job is running
-- id: unique id for the job
-- pid: process id for the job
-- exitCode: exit code of the job
-In ordinary cases you'd prefer to use the id instead of pid. The id is unique to
-Hilbish and is how you get jobs with the `hilbish.jobs` interface.
+Note: `job` refers to a job object. YOu can check `doc jobs` for more
+detail.
 
 + `job.start` -> job > Thrown when a new background job starts.
 

docs/jobs.txt

@@ -0,0 +1,40 @@
+Hilbish has pretty standard job control. It's missing one or two things,
+but works well. One thing which is different from other shells
+(besides Hilbish) itself is the API for jobs, and of course it's in Lua.
+You can add jobs, stop and delete (disown) them and even get output.
+
+# Job Interface
+The job interface refers to `hilbish.jobs`.
+## Functions
+(Note that in the list here, they're called from `hilbish.jobs`, so
+a listing of `foo` would mean `hilbish.jobs.foo`)
+
+- `all()` -> {jobs}: Returns a table of all jobs.
+- `last()` -> job: Returns the last added job.
+- `get(id)` -> job: Get a job by its ID.
+- `add(cmdstr, args, execPath)` -> job: Adds a new job to the job table.
+Note that this does not run the command; You have to start it manually.
+`cmdstr` is the user's input for the job, `args` is a table of arguments
+for the command. It includes arg0 (don't set it as entry 0 in the table)
+and `execPath` is an absolute path for the command executable.
+- `disown(id)`: Removes a job by ID from the job table.
+
+# Job Object
+A job object on the Lua side is a table with some functions.
+On the under side it represents a job in the job table.
+You can still have a job object for a disowned job,
+it just won't be *working* anywhere. :^)
+
+## Properties
+- `cmd`: command string
+- `running`: boolean whether the job is running
+- `id`: unique id for the job
+- `pid`: process id for the job
+- `exitCode`: exit code of the job
+In ordinary cases you'd prefer to use the `id` instead of `pid`.
+The `id` is unique to Hilbish and is how you get jobs with the
+`hilbish.jobs` interface. It may also not describe the job entirely.
+
+## Functions
+- `stop()`: Stops the job.
+- `start()`: Starts the job.

docs/lunacolors.txt

@@ -0,0 +1,34 @@
+Lunacolors is an ANSI color/styling library for Lua. It is included
+by default in standard Hilbish distributions to provide easy styling
+for things like prompts and text.
+
+For simple usage, a single color or style is enough. For example,
+you can just use `lunacolors.blue 'Hello world'` and that'll return
+blue text which you can print. This includes styles like bold,
+underline, etc.
+
+In other usage, you may want to use a format string instead of having
+multiple nested functions for different styles. This is where the format
+function comes in. You can used named keywords to style a section of text.
+
+The list of arguments are:
+Colors:
+- black
+- red
+- green
+- yellow
+- blue
+- magenta
+- cyan
+- white
+Styles:
+- bold
+- dim
+- italic
+- underline
+- invert
+
+For the colors, there are background and bright variants. The background
+color variants have a suffix of `Bg` and bright has a prefix of `bright`.
+Note that appropriate camel casing has to be applied to them. So bright
+blue would be `brightBlue` and background cyan would be `cyanBg`.

exec.go

@@ -239,7 +239,7 @@ func execCommand(cmd string, terminalOut bool) (io.Writer, io.Writer, error) {
 
 			stmtStr := buf.String()
 			buf.Reset()
-			jobs.add(stmtStr)
+			jobs.add(stmtStr, []string{}, "")
 		}
 
 		interp.ExecHandler(execHandle(bg))(runner)
@@ -357,13 +357,15 @@ func execHandle(bg bool) interp.ExecHandlerFunc {
 			Stderr: hc.Stderr,
 		}
 
-		err = cmd.Start()
 		var j *job
 		if bg {
 			j = jobs.getLatest()
-			j.setHandle(cmd.Process)
-			j.start(cmd.Process.Pid)
+			j.setHandle(&cmd)
+			err = j.start()
+		} else {
+			err = cmd.Start()
 		}
+
 		if err == nil {
 			if done := ctx.Done(); done != nil {
 				go func() {
@@ -388,35 +390,8 @@ func execHandle(bg bool) interp.ExecHandlerFunc {
 			err = cmd.Wait()
 		}
 
-		var exit uint8
-		switch x := err.(type) {
-		case *exec.ExitError:
-			// started, but errored - default to 1 if OS
-			// doesn't have exit statuses
-			if status, ok := x.Sys().(syscall.WaitStatus); ok {
-				if status.Signaled() {
-					if ctx.Err() != nil {
-						return ctx.Err()
-					}
-					exit = uint8(128 + status.Signal())
-					goto end
-				}
-				exit = uint8(status.ExitStatus())
-				goto end
-			}
-			exit = 1
-			goto end
-		case *exec.Error:
-			// did not start
-			fmt.Fprintf(hc.Stderr, "%v\n", err)
-			exit = 127
-			goto end
-		case nil:
-			goto end
-		default:
-			return err
-		}
-		end:
+		exit := handleExecErr(err)
+
 		if bg {
 			j.exitCode = int(exit)
 			j.finish()
@@ -425,6 +400,35 @@ func execHandle(bg bool) interp.ExecHandlerFunc {
 	}
 }
 
+func handleExecErr(err error) (exit uint8) {
+	ctx := context.TODO()
+
+	switch x := err.(type) {
+	case *exec.ExitError:
+		// started, but errored - default to 1 if OS
+		// doesn't have exit statuses
+		if status, ok := x.Sys().(syscall.WaitStatus); ok {
+			if status.Signaled() {
+				if ctx.Err() != nil {
+					return
+				}
+				exit = uint8(128 + status.Signal())
+				return
+			}
+			exit = uint8(status.ExitStatus())
+			return
+		}
+		exit = 1
+		return
+	case *exec.Error:
+		// did not start
+		//fmt.Fprintf(hc.Stderr, "%v\n", err)
+		exit = 127
+	default: return
+	}
+
+	return
+}
 func lookpath(file string) error { // custom lookpath function so we know if a command is found *and* is executable
 	var skip []string
 	if runtime.GOOS == "windows" {

execfile_unix.go

@@ -4,8 +4,13 @@ package main
 
 import (
 	"os"
+	"syscall"
 )
 
+var bgProcAttr *syscall.SysProcAttr = &syscall.SysProcAttr{
+	Setpgid: true,
+}
+
 func findExecutable(path string, inPath, dirs bool) error {
 	f, err := os.Stat(path)
 	if err != nil {

execfile_windows.go

@@ -5,8 +5,13 @@ package main
 import (
 	"path/filepath"
 	"os"
+	"syscall"
 )
 
+var bgProcAttr *syscall.SysProcAttr = &syscall.SysProcAttr{
+	CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
+}
+
 func findExecutable(path string, inPath, dirs bool) error {
 	nameExt := filepath.Ext(path)
 	pathExts := filepath.SplitList(os.Getenv("PATHEXT"))

go.mod

@@ -29,4 +29,4 @@ replace github.com/maxlandon/readline => ./readline
 
 replace layeh.com/gopher-luar => github.com/layeh/gopher-luar v1.0.10
 
-replace github.com/arnodel/golua => github.com/Rosettea/golua v0.0.0-20220419183026-6d22d6fec5ac
+replace github.com/arnodel/golua => github.com/Rosettea/golua v0.0.0-20220518005949-116371948fe3

go.sum

@@ -1,5 +1,7 @@
 github.com/Rosettea/golua v0.0.0-20220419183026-6d22d6fec5ac h1:dtXrgjch8PQyf7C90anZUquB5U3dr8AcMGJofeuirrI=
 github.com/Rosettea/golua v0.0.0-20220419183026-6d22d6fec5ac/go.mod h1:9jzpYPiU2is0HVGCiuIOBSXdergHUW44IEjmuN1UrIE=
+github.com/Rosettea/golua v0.0.0-20220518005949-116371948fe3 h1:I/wWr40FFLFF9pbT3wLb1FAEZhKb/hUWE+nJ5uHBK2g=
+github.com/Rosettea/golua v0.0.0-20220518005949-116371948fe3/go.mod h1:9jzpYPiU2is0HVGCiuIOBSXdergHUW44IEjmuN1UrIE=
 github.com/Rosettea/sh/v3 v3.4.0-0.dev.0.20220306140409-795a84b00b4e h1:P2XupP8SaylWaudD1DqbWtZ3mIa8OsE9635LmR+Q+lg=
 github.com/Rosettea/sh/v3 v3.4.0-0.dev.0.20220306140409-795a84b00b4e/go.mod h1:R09vh/04ILvP2Gj8/Z9Jd0Dh0ZIvaucowMEs6abQpWs=
 github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d h1:licZJFw2RwpHMqeKTCYkitsPqHNxTmd4SNR5r94FGM8=

job.go

@@ -1,8 +1,13 @@
 package main
 
 import (
-	"sync"
+	"bytes"
+	"errors"
+	"io"
 	"os"
+	"os/exec"
+	"sync"
+	"syscall"
 
 	"hilbish/util"
 
@@ -17,18 +22,59 @@ type job struct {
 	id int
 	pid int
 	exitCode int
-	proc *os.Process
+	once bool
+	args []string
+	// save path for a few reasons, one being security (lmao) while the other
+	// would just be so itll be the same binary command always (path changes)
+	path string
+	handle *exec.Cmd
+	cmdout io.Writer
+	cmderr io.Writer
+	stdout *bytes.Buffer
+	stderr *bytes.Buffer
 }
 
-func (j *job) start(pid int) {
-	j.pid = pid
+func (j *job) start() error {
+	if j.handle == nil || j.once {
+		// cmd cant be reused so make a new one
+		cmd := exec.Cmd{
+			Path: j.path,
+			Args: j.args,
+		}
+		j.setHandle(&cmd)
+	}
+	// bgProcAttr is defined in execfile_<os>.go, it holds a procattr struct
+	// in a simple explanation, it makes signals from hilbish (sigint)
+	// not go to it (child process)
+	j.handle.SysProcAttr = bgProcAttr
+	// reset output buffers
+	j.stdout.Reset()
+	j.stderr.Reset()
+	// make cmd write to both standard output and output buffers for lua access
+	j.handle.Stdout = io.MultiWriter(j.cmdout, j.stdout)
+	j.handle.Stderr = io.MultiWriter(j.cmderr, j.stderr)
+
+	if !j.once {
+		j.once = true
+	}
+
+	err := j.handle.Start()
+	proc := j.getProc()
+
+	j.pid = proc.Pid
 	j.running = true
+
 	hooks.Em.Emit("job.start", j.lua())
+
+	return err
 }
 
 func (j *job) stop() {
 	// finish will be called in exec handle
-	j.proc.Kill()
+	proc := j.getProc()
+	if proc != nil {
+		proc.Kill()
+	}
 }
 
 func (j *job) finish() {
@@ -36,13 +82,35 @@ func (j *job) finish() {
 	hooks.Em.Emit("job.done", j.lua())
 }
 
-func (j *job) setHandle(handle *os.Process) {
-	j.proc = handle
+func (j *job) wait() {
+	j.handle.Wait()
+}
+
+func (j *job) setHandle(handle *exec.Cmd) {
+	j.handle = handle
+	j.args = handle.Args
+	j.path = handle.Path
+	if handle.Stdout != nil {
+		j.cmdout = handle.Stdout
+	}
+	if handle.Stderr != nil {
+		j.cmderr = handle.Stderr
+	}
+}
+
+func (j *job) getProc() *os.Process {
+	handle := j.handle
+	if handle != nil {
+		return handle.Process
+	}
+
+	return nil
 }
 
 func (j *job) lua() rt.Value {
 	jobFuncs := map[string]util.LuaExport{
 		"stop": {j.luaStop, 0, false},
+		"start": {j.luaStart, 0, false},
 	}
 	luaJob := rt.NewTable()
 	util.SetExports(l, luaJob, jobFuncs)
@@ -52,10 +120,23 @@ func (j *job) lua() rt.Value {
 	luaJob.Set(rt.StringValue("id"), rt.IntValue(int64(j.id)))
 	luaJob.Set(rt.StringValue("pid"), rt.IntValue(int64(j.pid)))
 	luaJob.Set(rt.StringValue("exitCode"), rt.IntValue(int64(j.exitCode)))
+	luaJob.Set(rt.StringValue("stdout"), rt.StringValue(string(j.stdout.Bytes())))
+	luaJob.Set(rt.StringValue("stderr"), rt.StringValue(string(j.stderr.Bytes())))
 
 	return rt.TableValue(luaJob)
 }
 
+func (j *job) luaStart(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
+	if !j.running {
+		err := j.start()
+		exit := handleExecErr(err)
+		j.exitCode = int(exit)
+		j.finish()
+	}
+
+	return c.Next(), nil
+}
+
 func (j *job) luaStop(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 	if j.running {
 		j.stop()
@@ -79,7 +160,7 @@ func newJobHandler() *jobHandler {
 	}
 }
 
-func (j *jobHandler) add(cmd string) *job {
+func (j *jobHandler) add(cmd string, args []string, path string) *job {
 	j.mu.Lock()
 	defer j.mu.Unlock()
 
@@ -88,8 +169,15 @@ func (j *jobHandler) add(cmd string) *job {
 		cmd: cmd,
 		running: false,
 		id: j.latestID,
+		args: args,
+		path: path,
+		cmdout: os.Stdout,
+		cmderr: os.Stderr,
+		stdout: &bytes.Buffer{},
+		stderr: &bytes.Buffer{},
 	}
 	j.jobs[j.latestID] = jb
+	hooks.Em.Emit("job.add", jb.lua())
 
 	return jb
 }
@@ -101,11 +189,41 @@ func (j *jobHandler) getLatest() *job {
 	return j.jobs[j.latestID]
 }
 
+func (j *jobHandler) disown(id int) error {
+	j.mu.RLock()
+	if j.jobs[id] == nil {
+		return errors.New("job doesnt exist")
+	}
+	j.mu.RUnlock()
+
+	j.mu.Lock()
+	delete(j.jobs, id)
+	j.mu.Unlock()
+
+	return nil
+}
+
+func (j *jobHandler) stopAll() {
+	j.mu.RLock()
+	defer j.mu.RUnlock()
+
+	for _, jb := range j.jobs {
+		// on exit, unix shell should send sighup to all jobs
+		if jb.running {
+			proc := jb.getProc()
+			proc.Signal(syscall.SIGHUP)
+			jb.wait() // waits for program to exit due to sighup
+		}
+	}
+}
+
 func (j *jobHandler) loader(rtm *rt.Runtime) *rt.Table {
 	jobFuncs := map[string]util.LuaExport{
 		"all": {j.luaAllJobs, 0, false},
+		"last": {j.luaLastJob, 0, false},
 		"get": {j.luaGetJob, 1, false},
-		"add": {j.luaAddJob, 1, false},
+		"add": {j.luaAddJob, 3, false},
+		"disown": {j.luaDisownJob, 1, false},
 	}
 
 	luaJob := rt.NewTable()
@@ -135,18 +253,30 @@ func (j *jobHandler) luaGetJob(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 }
 
 func (j *jobHandler) luaAddJob(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
-	j.mu.RLock()
-	defer j.mu.RUnlock()
-
-	if err := c.Check1Arg(); err != nil {
+	if err := c.CheckNArgs(3); err != nil {
 		return nil, err
 	}
 	cmd, err := c.StringArg(0)
 	if err != nil {
 		return nil, err
 	}
+	largs, err := c.TableArg(1)
+	if err != nil {
+		return nil, err
+	}
+	execPath, err := c.StringArg(2)
+	if err != nil {
+		return nil, err
+	}
 
-	jb := j.add(cmd)
+	var args []string
+	util.ForEach(largs, func(k rt.Value, v rt.Value) {
+		if v.Type() == rt.StringType {
+			args = append(args, v.AsString())
+		}
+	})
+
+	jb := j.add(cmd, args, execPath)
 
 	return c.PushingNext1(t.Runtime, jb.lua()), nil
 }
@@ -162,3 +292,32 @@ func (j *jobHandler) luaAllJobs(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 
 	return c.PushingNext1(t.Runtime, rt.TableValue(jobTbl)), nil
 }
+
+func (j *jobHandler) luaDisownJob(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
+	if err := c.Check1Arg(); err != nil {
+		return nil, err
+	}
+	jobID, err := c.IntArg(0)
+	if err != nil {
+		return nil, err
+	}
+
+	err = j.disown(int(jobID))
+	if err != nil {
+		return nil, err
+	}
+
+	return c.Next(), nil
+}
+
+func (j *jobHandler) luaLastJob(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
+	j.mu.RLock()
+	defer j.mu.RUnlock()
+
+	job := j.jobs[j.latestID]
+	if job == nil { // incase we dont have any jobs yet
+		return c.Next(), nil
+	}
+
+	return c.PushingNext1(t.Runtime, job.lua()), nil
+}

libs/lunacolors

@@ -1 +1 @@
-Subproject commit b362397a83e4516415c809c7d690b52e79a95f6e
+Subproject commit d60cd77c73875b5bb55e5a2fdc30bae01a7ac499

main.go

@@ -221,6 +221,8 @@ input:
 		}
 		fmt.Printf("\u001b[7m∆\u001b[0m" + strings.Repeat(" ", termwidth - 1) + "\r")
 	}
+
+	exit(0)
 }
 
 func continuePrompt(prev string) (string, error) {
@@ -294,12 +296,15 @@ func contains(s []string, e string) bool {
 }
 
 func exit(code int) {
-	// wait for all timers to finish before exiting
-	for {
-		if timers.running == 0 {
+	jobs.stopAll()
+
+	// wait for all timers to finish before exiting.
+	// only do that when not interactive
+	if !interactive {
+		timers.wait()
+	}
+
 	os.Exit(code)
-		}
-	}
 }
 
 func getVersion() string {

nature/commands/disown.lua

@@ -0,0 +1,25 @@
+local commander = require 'commander'
+
+commander.register('disown', function(args)
+	if #hilbish.jobs.all() == 0 then
+		print 'disown: no current job'
+		return 1
+	end
+
+	local id
+	if #args < 0 then
+		id = tonumber(args[1])
+		if not id then
+			print 'disown: invalid id for job'
+			return 1
+		end
+	else
+		id = hilbish.jobs.last().id
+	end
+
+	local ok = pcall(hilbish.jobs.disown, id)
+	if not ok then
+		print 'disown: job does not exist'
+		return 2
+	end
+end)

nature/commands/init.lua

@@ -4,3 +4,4 @@ require 'nature.commands.cdr'
 require 'nature.commands.doc'
 require 'nature.commands.exit'
 require 'nature.commands.guide'
+require 'nature.commands.disown'

signal_unix.go

@@ -10,20 +10,13 @@ import (
 
 func handleSignals() {
 	c := make(chan os.Signal)
-	signal.Notify(c, os.Interrupt, syscall.SIGWINCH, syscall.SIGUSR1, syscall.SIGUSR2, syscall.SIGQUIT)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM, syscall.SIGWINCH, syscall.SIGUSR1, syscall.SIGUSR2, syscall.SIGQUIT)
 
 	for s := range c {
 		switch s {
-		case os.Interrupt:
-			hooks.Em.Emit("signal.sigint")
-			if !running && interactive {
-				lr.ClearInput()
-			}
-		case syscall.SIGWINCH:
-			hooks.Em.Emit("signal.resize")
-			if !running && interactive {
-				lr.Resize()
-			}
+		case os.Interrupt: hooks.Em.Emit("signal.sigint")
+		case syscall.SIGTERM: exit(0)
+		case syscall.SIGWINCH: hooks.Em.Emit("signal.resize")
 		case syscall.SIGUSR1: hooks.Em.Emit("signal.sigusr1")
 		case syscall.SIGUSR2: hooks.Em.Emit("signal.sigusr2")
 		}

timer.go

@@ -25,7 +25,7 @@ type timer struct{
 	fun *rt.Closure
 	th *timerHandler
 	ticker *time.Ticker
-	channel chan bool
+	channel chan struct{}
 }
 
 func (t *timer) start() error {
@@ -35,6 +35,7 @@ func (t *timer) start() error {
 
 	t.running = true
 	t.th.running++
+	t.th.wg.Add(1)
 	t.ticker = time.NewTicker(t.dur)
 
 	go func() {
@@ -65,9 +66,10 @@ func (t *timer) stop() error {
 		return errors.New("timer not running")
 	}
 
-	t.channel <- true
+	t.channel <- struct{}{}
 	t.running = false
 	t.th.running--
+	t.th.wg.Done()
 	
 	return nil
 }

timerhandler.go

@@ -12,6 +12,7 @@ import (
 var timers *timerHandler
 type timerHandler struct {
 	mu *sync.RWMutex
+	wg *sync.WaitGroup
 	timers map[int]*timer
 	latestID int
 	running int
@@ -22,9 +23,14 @@ func newTimerHandler() *timerHandler {
 		timers: make(map[int]*timer),
 		latestID: 0,
 		mu: &sync.RWMutex{},
+		wg: &sync.WaitGroup{},
 	}
 }
 
+func (th *timerHandler) wait() {
+	th.wg.Wait()
+}
+
 func (th *timerHandler) create(typ timerType, dur time.Duration, fun *rt.Closure) *timer {
 	th.mu.Lock()
 	defer th.mu.Unlock()
@@ -34,7 +40,7 @@ func (th *timerHandler) create(typ timerType, dur time.Duration, fun *rt.Closure
 		typ: typ,
 		fun: fun,
 		dur: dur,
-		channel: make(chan bool, 1),
+		channel: make(chan struct{}, 1),
 		th: th,
 		id: th.latestID,
 	}