Initial project import

tools/v/examples/coroutines/coroutines_bench.v

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+// vtest build: false // This should be build with: `v -use-coroutines coroutine_benchs.v`
+// Note: the Photon wrapper is not yet trivial enough to build/install on the CI.
+import coroutines
+import time
+import net.http
+import sync
+
+const run_time = 10 * time.second
+
+fn request(mut mu sync.Mutex, count &int) {
+	for {
+		http.get('http://vlang.io/utc_now') or { panic(err) }
+		mu.lock()
+		unsafe {
+			(*count)++
+		}
+		mu.unlock()
+	}
+}
+
+fn main() {
+	mut mu := sync.new_mutex()
+	mut count := 0
+
+	for _ in 0 .. 8 {
+		go request(mut mu, &count)
+	}
+	$if is_coroutine ? {
+		println('IS COROUTINE=true')
+		coroutines.sleep(run_time)
+	} $else {
+		println('IS COROUTINE=false')
+		time.sleep(run_time)
+	}
+	println('${count} requests made.')
+}

tools/v/examples/coroutines/simple_coroutines.v

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+// vtest build: false // This should be build with: v -use-coroutines simple_coroutines.v
+// Note: the Photon wrapper is not yet trivial enough to build/install on the CI.
+import coroutines
+import time
+import os
+import net.http
+
+fn foo(a int) {
+	for {
+		println('1hello from foo() a=${a}')
+		// C.printf(c'hello from foo() a=%d\n', a)
+		coroutines.sleep(1 * time.second)
+	}
+}
+
+fn foo2(a int) {
+	mut i := 0
+	for {
+		println('hello from foo2() a=${a}')
+		// C.printf(c'hello from foo2() a=%d\n', a)
+		coroutines.sleep(2 * time.second)
+		i++
+		resp := http.get('https://vlang.io/utc_now') or { panic(err) }
+		println(resp)
+		mut f := os.create('/tmp/FOO2_a${i}') or { panic(err) }
+		f.write_string(resp.body) or { panic(err) }
+		f.close()
+	}
+}
+
+fn foo3(a int) {
+	for {
+		println('hello from foo3() a=${a}')
+		// C.printf(c'hello from foo3() a=%d\n', a)
+		coroutines.sleep(3 * time.second)
+	}
+}
+
+fn foo4(a int) {
+	for {
+		println('hello from foo4() a=${a}')
+		// C.printf(c'hello from foo4() a=%d\n', a)
+		coroutines.sleep(3 * time.second)
+	}
+}
+
+fn main() {
+	go foo(10)
+	go foo2(20)
+	go foo3(30)
+	go foo3(40)
+	$if is_coroutine ? {
+		println('IS COROUTINE=true')
+	} $else {
+		println('IS COROUTINE=false')
+	}
+	for {
+		println('hello from MAIN')
+		coroutines.sleep(1 * time.second)
+	}
+	println('done')
+}