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timers: use ref counts to count timers #41231

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merged 1 commit into from Jan 2, 2022
Merged

timers: use ref counts to count timers #41231

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12 changes: 5 additions & 7 deletions lib/internal/bootstrap/node.js
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Expand Up @@ -39,17 +39,16 @@
setupPrepareStackTrace();

const {
Array,
ArrayPrototypeConcat,
ArrayPrototypeFilter,
ArrayPrototypeMap,
ArrayPrototypeFill,
FunctionPrototypeCall,
JSONParse,
ObjectDefineProperty,
ObjectDefineProperties,
ObjectGetPrototypeOf,
ObjectPreventExtensions,
ObjectSetPrototypeOf,
ObjectValues,
ReflectGet,
ReflectSet,
SymbolToStringTag,
Expand Down Expand Up @@ -156,13 +155,12 @@ const rawMethods = internalBinding('process_methods');
process._getActiveHandles = rawMethods._getActiveHandles;

process.getActiveResourcesInfo = function() {
const timerCounts = internalTimers.getTimerCounts();
return ArrayPrototypeConcat(
rawMethods._getActiveRequestsInfo(),
rawMethods._getActiveHandlesInfo(),
ArrayPrototypeMap(
ArrayPrototypeFilter(ObjectValues(internalTimers.activeTimersMap),
({ resource }) => resource.hasRef()),
({ type }) => type));
ArrayPrototypeFill(new Array(timerCounts.timeoutCount), 'Timeout'),
ArrayPrototypeFill(new Array(timerCounts.immediateCount), 'Immediate'));
};

// TODO(joyeecheung): remove these
Expand Down
21 changes: 9 additions & 12 deletions lib/internal/timers.js
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Expand Up @@ -139,12 +139,6 @@ const kRefed = Symbol('refed');
// Create a single linked list instance only once at startup
const immediateQueue = new ImmediateList();

// Object map containing timers
//
// - key = asyncId
// - value = { type, resource }
const activeTimersMap = ObjectCreate(null);

let nextExpiry = Infinity;
let refCount = 0;

Expand All @@ -166,7 +160,6 @@ function initAsyncResource(resource, type) {
resource[trigger_async_id_symbol] = getDefaultTriggerAsyncId();
if (initHooksExist())
emitInit(asyncId, type, triggerAsyncId, resource);
activeTimersMap[asyncId] = { type, resource };
}

// Timer constructor function.
Expand Down Expand Up @@ -478,7 +471,6 @@ function getTimerCallbacks(runNextTicks) {

if (destroyHooksExist())
emitDestroy(asyncId);
delete activeTimersMap[asyncId];

outstandingQueue.head = immediate = immediate._idleNext;
}
Expand Down Expand Up @@ -551,7 +543,6 @@ function getTimerCallbacks(runNextTicks) {

if (destroyHooksExist())
emitDestroy(asyncId);
delete activeTimersMap[asyncId];
}
continue;
}
Expand Down Expand Up @@ -580,7 +571,6 @@ function getTimerCallbacks(runNextTicks) {

if (destroyHooksExist())
emitDestroy(asyncId);
delete activeTimersMap[asyncId];
}
}

Expand Down Expand Up @@ -648,6 +638,13 @@ class Immediate {
}
}

function getTimerCounts() {
return {
timeoutCount: refCount,
immediateCount: immediateInfo[kRefCount],
};
}

module.exports = {
TIMEOUT_MAX,
kTimeout: Symbol('timeout'), // For hiding Timeouts on other internals.
Expand All @@ -670,9 +667,9 @@ module.exports = {
active,
unrefActive,
insert,
activeTimersMap,
timerListMap,
timerListQueue,
decRefCount,
incRefCount
incRefCount,
getTimerCounts,
};
3 changes: 0 additions & 3 deletions lib/timers.js
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Expand Up @@ -45,7 +45,6 @@ const {
kRefed,
kHasPrimitive,
getTimerDuration,
activeTimersMap,
timerListMap,
timerListQueue,
immediateQueue,
Expand Down Expand Up @@ -88,7 +87,6 @@ function unenroll(item) {
// Fewer checks may be possible, but these cover everything.
if (destroyHooksExist() && item[async_id_symbol] !== undefined)
emitDestroy(item[async_id_symbol]);
delete activeTimersMap[item[async_id_symbol]];

L.remove(item);

Expand Down Expand Up @@ -331,7 +329,6 @@ function clearImmediate(immediate) {
if (destroyHooksExist() && immediate[async_id_symbol] !== undefined) {
emitDestroy(immediate[async_id_symbol]);
}
delete activeTimersMap[immediate[async_id_symbol]];

immediate._onImmediate = null;

Expand Down