tests: cleanup compiler_errors_test.v using language features (chan), instead of raw `sync.new_channel` and `unsafe { ch.push }` calls

vlib/v/compiler_errors_test.v

@@ -4,7 +4,6 @@ import term
 import v.util.diff
 import v.util.vtest
 import time
-import sync
 import runtime
 import benchmark
 
@@ -16,8 +15,12 @@ const skip_on_ubuntu_musl = [
 	'vlib/v/checker/tests/vweb_tmpl_used_var.vv',
 ]
 
+const vexe = os.getenv('VEXE')
+
 const turn_off_vcolors = os.setenv('VCOLORS', 'never', true)
 
+const show_cmd = os.getenv('VTEST_SHOW_CMD') != ''
+
 // This is needed, because some of the .vv files are tests, and we do need stable
 // output from them, that can be compared against their .out files:
 const turn_on_normal_test_runner = os.setenv('VTEST_RUNNER', 'normal', true)
@@ -26,6 +29,8 @@ const should_autofix = os.getenv('VAUTOFIX') != ''
 
 const github_job = os.getenv('GITHUB_JOB')
 
+const v_ci_ubuntu_musl = os.getenv('V_CI_UBUNTU_MUSL').len > 0
+
 struct TaskDescription {
 	vexe             string
 	evars            string
@@ -54,7 +59,6 @@ mut:
 }
 
 fn test_all() {
-	vexe := os.getenv('VEXE')
 	vroot := os.dir(vexe)
 	os.chdir(vroot) or {}
 	checker_dir := 'vlib/v/checker/tests'
@@ -162,15 +166,11 @@ fn (mut tasks Tasks) add(custom_vexe string, dir string, voptions string, result
 }
 
 fn (mut tasks Tasks) add_evars(evars string, custom_vexe string, dir string, voptions string, result_extension string, tests []string, is_module bool) {
-	mut vexe := tasks.vexe
-	if custom_vexe != '' {
-		vexe = custom_vexe
-	}
 	paths := vtest.filter_vtest_only(tests, basepath: dir)
 	for path in paths {
 		tasks.all << TaskDescription{
 			evars: evars
-			vexe: vexe
+			vexe: if custom_vexe != '' { custom_vexe } else { tasks.vexe }
 			dir: dir
 			voptions: voptions
 			result_extension: result_extension
@@ -186,14 +186,17 @@ fn bstep_message(mut bench benchmark.Benchmark, label string, msg string, sdurat
 
 // process an array of tasks in parallel, using no more than vjobs worker threads
 fn (mut tasks Tasks) run() {
-	tasks.show_cmd = os.getenv('VTEST_SHOW_CMD') != ''
+	if tasks.all.len == 0 {
+		return
+	}
+	tasks.show_cmd = show_cmd
 	vjobs := if tasks.parallel_jobs > 0 { tasks.parallel_jobs } else { runtime.nr_jobs() }
 	mut bench := benchmark.new_benchmark()
 	bench.set_total_expected_steps(tasks.all.len)
-	mut work := sync.new_channel<TaskDescription>(u32(tasks.all.len))
-	mut results := sync.new_channel<TaskDescription>(u32(tasks.all.len))
+	mut work := chan TaskDescription{cap: tasks.all.len}
+	mut results := chan TaskDescription{cap: tasks.all.len}
 	mut m_skip_files := skip_files.clone()
-	if os.getenv('V_CI_UBUNTU_MUSL').len > 0 {
+	if v_ci_ubuntu_musl {
 		m_skip_files << skip_on_ubuntu_musl
 	}
 	$if noskip ? {
@@ -220,11 +223,11 @@ fn (mut tasks Tasks) run() {
 		if tasks.all[i].path in m_skip_files {
 			tasks.all[i].is_skipped = true
 		}
-		unsafe { work.push(&tasks.all[i]) }
+		work <- tasks.all[i]
 	}
 	work.close()
 	for _ in 0 .. vjobs {
-		go work_processor(mut work, mut results)
+		go work_processor(work, results)
 	}
 	if github_job == '' {
 		println('')
@@ -233,7 +236,7 @@ fn (mut tasks Tasks) run() {
 	mut total_errors := 0
 	for _ in 0 .. tasks.all.len {
 		mut task := TaskDescription{}
-		results.pop(&task)
+		task = <-results
 		bench.step()
 		if task.is_skipped {
 			bench.skip()
@@ -285,16 +288,13 @@ fn (mut tasks Tasks) run() {
 
 // a single worker thread spends its time getting work from the `work` channel,
 // processing the task, and then putting the task in the `results` channel
-fn work_processor(mut work sync.Channel, mut results sync.Channel) {
+fn work_processor(work chan TaskDescription, results chan TaskDescription) {
 	for {
-		mut task := TaskDescription{}
-		if !work.pop(&task) {
-			break
-		}
+		mut task := <-work or { break }
 		sw := time.new_stopwatch()
 		task.execute()
 		task.took = sw.elapsed()
-		results.push(&task)
+		results <- task
 	}
 }
 

vlib/v/tests/inout/push_work_on_channel.out

@@ -0,0 +1,15 @@
+> main start
+> work started
+> main ch.close called
+> work x: 0
+> work x: 1
+> work x: 2
+> work x: 3
+> work x: 4
+> work x: 5
+> work x: 6
+> work x: 7
+> work x: 8
+> work x: 9
+> work ended
+> main task was finished

vlib/v/tests/inout/push_work_on_channel.vv

@@ -0,0 +1,29 @@
+import time
+
+fn work(input chan u32, started chan bool) {
+	println('> work started')
+	started <- true
+	for {
+		x := <-input or { break }
+		println('> work x: $x')
+		time.sleep(50 * time.millisecond)
+	}
+	println('> work ended')
+}
+
+fn main() {
+	println('> main start')
+	ch := chan u32{cap: 100}
+	work_started := chan bool{}
+	for x in 0 .. 10 {
+		ch <- x
+	}
+	task := go work(ch, work_started)
+	_ := <-work_started
+
+	ch.close()
+	println('> main ch.close called')
+
+	task.wait()
+	println('> main task was finished')
+}