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test: add coverage for napi_cancel_async_work

adding test coverage for napi_cancel_async_work based
on coverage report

PR-URL: #12575
Reviewed-By: James M Snell <>
Reviewed-By: Colin Ihrig <>
Reviewed-By: Anna Henningsen <>
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mhdawson committed Apr 21, 2017
1 parent 35d2137 commit 1d968030d45e110f00a8d5e03b2bce45ae0806d0
Showing with 80 additions and 7 deletions.
  1. +4 −1 test/addons-napi/test_async/test.js
  2. +76 −6 test/addons-napi/test_async/
@@ -3,8 +3,11 @@ const common = require('../../common');
const assert = require('assert');
const test_async = require(`./build/${common.buildType}/test_async`);

test_async(5, common.mustCall(function(err, val) {
test_async.Test(5, common.mustCall(function(err, val) {
assert.strictEqual(err, null);
assert.strictEqual(val, 10);
process.nextTick(common.mustCall(function() {}));

const cancelSuceeded = function() {};
@@ -7,6 +7,9 @@
#include <unistd.h>

// this needs to be greater than the thread pool size

typedef struct {
int32_t _input;
int32_t _output;
@@ -15,6 +18,7 @@ typedef struct {
} carrier;

carrier the_carrier;
carrier async_carrier[MAX_CANCEL_THREADS];

struct AutoHandleScope {
explicit AutoHandleScope(napi_env env)
@@ -74,7 +78,7 @@ void Complete(napi_env env, napi_status status, void* data) {

napi_value result;
napi_call_function(env, global, callback, 2, argv, &result));
napi_make_callback(env, global, callback, 2, argv, &result));

NAPI_CALL_RETURN_VOID(env, napi_delete_reference(env, c->_callback));
NAPI_CALL_RETURN_VOID(env, napi_delete_async_work(env, c->_request));
@@ -111,12 +115,78 @@ napi_value Test(napi_env env, napi_callback_info info) {
return nullptr;

void BusyCancelComplete(napi_env env, napi_status status, void* data) {
AutoHandleScope scope(env);
carrier* c = static_cast<carrier*>(data);
NAPI_CALL_RETURN_VOID(env, napi_delete_async_work(env, c->_request));

void CancelComplete(napi_env env, napi_status status, void* data) {
AutoHandleScope scope(env);
carrier* c = static_cast<carrier*>(data);

if (status == napi_cancelled) {
// ok we got the status we expected so make the callback to
// indicate the cancel succeeded.
napi_value callback;
napi_get_reference_value(env, c->_callback, &callback));
napi_value global;
NAPI_CALL_RETURN_VOID(env, napi_get_global(env, &global));
napi_value result;
napi_make_callback(env, global, callback, 0, nullptr, &result));

NAPI_CALL_RETURN_VOID(env, napi_delete_async_work(env, c->_request));
NAPI_CALL_RETURN_VOID(env, napi_delete_reference(env, c->_callback));

void CancelExecute(napi_env env, void* data) {
#if defined _WIN32

napi_value TestCancel(napi_env env, napi_callback_info info) {
size_t argc = 1;
napi_value argv[1];
napi_value _this;
void* data;

// make sure the work we are going to cancel will not be
// able to start by using all the threads in the pool
for (int i = 1; i < MAX_CANCEL_THREADS; i++) {
NAPI_CALL(env, napi_create_async_work(env, CancelExecute,
BusyCancelComplete, &async_carrier[i], &async_carrier[i]._request));
NAPI_CALL(env, napi_queue_async_work(env, async_carrier[i]._request));

// now queue the work we are going to cancel and then cancel it.
// cancel will fail if the work has already started, but
// we have prevented it from starting by consuming all of the
// workers above.
napi_get_cb_info(env, info, &argc, argv, &_this, &data));
NAPI_CALL(env, napi_create_async_work(env, CancelExecute,
CancelComplete, &async_carrier[0], &async_carrier[0]._request));
napi_create_reference(env, argv[0], 1, &async_carrier[0]._callback));
NAPI_CALL(env, napi_queue_async_work(env, async_carrier[0]._request));
NAPI_CALL(env, napi_cancel_async_work(env, async_carrier[0]._request));
return nullptr;

void Init(napi_env env, napi_value exports, napi_value module, void* priv) {
napi_value test;
napi_create_function(env, "Test", Test, nullptr, &test));
napi_set_named_property(env, module, "exports", test));
napi_property_descriptor properties[] = {
DECLARE_NAPI_PROPERTY("TestCancel", TestCancel),

NAPI_CALL_RETURN_VOID(env, napi_define_properties(
env, exports, sizeof(properties) / sizeof(*properties), properties));

NAPI_MODULE(addon, Init)

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