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event_loop.zig
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const std = @import("std");
const JSC = bun.JSC;
const JSGlobalObject = JSC.JSGlobalObject;
const VirtualMachine = JSC.VirtualMachine;
const Allocator = std.mem.Allocator;
const Lock = @import("../lock.zig").Lock;
const bun = @import("root").bun;
const Environment = bun.Environment;
const Fetch = JSC.WebCore.Fetch;
const WebCore = JSC.WebCore;
const Bun = JSC.API.Bun;
const TaggedPointerUnion = @import("../tagged_pointer.zig").TaggedPointerUnion;
const typeBaseName = @import("../meta.zig").typeBaseName;
const AsyncGlobWalkTask = JSC.API.Glob.WalkTask.AsyncGlobWalkTask;
const CopyFilePromiseTask = WebCore.Blob.Store.CopyFile.CopyFilePromiseTask;
const AsyncTransformTask = JSC.API.JSTranspiler.TransformTask.AsyncTransformTask;
const ReadFileTask = WebCore.Blob.ReadFile.ReadFileTask;
const WriteFileTask = WebCore.Blob.WriteFile.WriteFileTask;
const napi_async_work = JSC.napi.napi_async_work;
const FetchTasklet = Fetch.FetchTasklet;
const JSValue = JSC.JSValue;
const js = JSC.C;
const Waker = bun.Async.Waker;
pub const WorkPool = @import("../work_pool.zig").WorkPool;
pub const WorkPoolTask = @import("../work_pool.zig").Task;
const uws = bun.uws;
const Async = bun.Async;
pub fn ConcurrentPromiseTask(comptime Context: type) type {
return struct {
const This = @This();
ctx: *Context,
task: WorkPoolTask = .{ .callback = &runFromThreadPool },
event_loop: *JSC.EventLoop,
allocator: std.mem.Allocator,
promise: JSC.JSPromise.Strong = .{},
globalThis: *JSGlobalObject,
concurrent_task: JSC.ConcurrentTask = .{},
// This is a poll because we want it to enter the uSockets loop
ref: Async.KeepAlive = .{},
pub usingnamespace bun.New(@This());
pub fn createOnJSThread(allocator: std.mem.Allocator, globalThis: *JSGlobalObject, value: *Context) !*This {
var this = This.new(.{
.event_loop = VirtualMachine.get().event_loop,
.ctx = value,
.allocator = allocator,
.globalThis = globalThis,
});
var promise = JSC.JSPromise.create(globalThis);
this.promise.strong.set(globalThis, promise.asValue(globalThis));
this.ref.ref(this.event_loop.virtual_machine);
return this;
}
pub fn runFromThreadPool(task: *WorkPoolTask) void {
var this: *This = @fieldParentPtr("task", task);
Context.run(this.ctx);
this.onFinish();
}
pub fn runFromJS(this: *This) void {
const promise = this.promise.swap();
this.ref.unref(this.event_loop.virtual_machine);
var ctx = this.ctx;
ctx.then(promise);
}
pub fn schedule(this: *This) void {
WorkPool.schedule(&this.task);
}
pub fn onFinish(this: *This) void {
this.event_loop.enqueueTaskConcurrent(this.concurrent_task.from(this, .manual_deinit));
}
pub fn deinit(this: *This) void {
this.promise.strong.deinit();
this.destroy();
}
};
}
pub fn WorkTask(comptime Context: type) type {
return struct {
const TaskType = WorkPoolTask;
const This = @This();
ctx: *Context,
task: TaskType = .{ .callback = &runFromThreadPool },
event_loop: *JSC.EventLoop,
allocator: std.mem.Allocator,
globalThis: *JSGlobalObject,
concurrent_task: ConcurrentTask = .{},
async_task_tracker: JSC.AsyncTaskTracker,
// This is a poll because we want it to enter the uSockets loop
ref: Async.KeepAlive = .{},
pub usingnamespace bun.New(@This());
pub fn createOnJSThread(allocator: std.mem.Allocator, globalThis: *JSGlobalObject, value: *Context) !*This {
var vm = globalThis.bunVM();
var this = This.new(.{
.event_loop = vm.eventLoop(),
.ctx = value,
.allocator = allocator,
.globalThis = globalThis,
.async_task_tracker = JSC.AsyncTaskTracker.init(vm),
});
this.ref.ref(this.event_loop.virtual_machine);
return this;
}
pub fn runFromThreadPool(task: *TaskType) void {
JSC.markBinding(@src());
const this: *This = @fieldParentPtr("task", task);
Context.run(this.ctx, this);
}
pub fn runFromJS(this: *This) void {
var ctx = this.ctx;
const tracker = this.async_task_tracker;
const vm = this.event_loop.virtual_machine;
const globalThis = this.globalThis;
this.ref.unref(vm);
tracker.willDispatch(globalThis);
ctx.then(globalThis);
tracker.didDispatch(globalThis);
}
pub fn schedule(this: *This) void {
const vm = this.event_loop.virtual_machine;
this.ref.ref(vm);
this.async_task_tracker.didSchedule(this.globalThis);
WorkPool.schedule(&this.task);
}
pub fn onFinish(this: *This) void {
this.event_loop.enqueueTaskConcurrent(this.concurrent_task.from(this, .manual_deinit));
}
pub fn deinit(this: *This) void {
this.ref.unref(this.event_loop.virtual_machine);
this.destroy();
}
};
}
pub const AnyTask = struct {
ctx: ?*anyopaque,
callback: *const (fn (*anyopaque) void),
pub fn task(this: *AnyTask) Task {
return Task.init(this);
}
pub fn run(this: *AnyTask) void {
@setRuntimeSafety(false);
const callback = this.callback;
const ctx = this.ctx;
callback(ctx.?);
}
pub fn New(comptime Type: type, comptime Callback: anytype) type {
return struct {
pub fn init(ctx: *Type) AnyTask {
return AnyTask{
.callback = wrap,
.ctx = ctx,
};
}
pub fn wrap(this: ?*anyopaque) void {
@call(bun.callmod_inline, Callback, .{@as(*Type, @ptrCast(@alignCast(this.?)))});
}
};
}
};
pub const ManagedTask = struct {
ctx: ?*anyopaque,
callback: *const (fn (*anyopaque) void),
pub fn task(this: *ManagedTask) Task {
return Task.init(this);
}
pub fn run(this: *ManagedTask) void {
@setRuntimeSafety(false);
const callback = this.callback;
const ctx = this.ctx;
callback(ctx.?);
bun.default_allocator.destroy(this);
}
pub fn New(comptime Type: type, comptime Callback: anytype) type {
return struct {
pub fn init(ctx: *Type) Task {
var managed = bun.default_allocator.create(ManagedTask) catch bun.outOfMemory();
managed.* = ManagedTask{
.callback = wrap,
.ctx = ctx,
};
return managed.task();
}
pub fn wrap(this: ?*anyopaque) void {
@call(bun.callmod_inline, Callback, .{@as(*Type, @ptrCast(@alignCast(this.?)))});
}
};
}
};
pub const AnyTaskWithExtraContext = struct {
ctx: ?*anyopaque = undefined,
callback: *const (fn (*anyopaque, *anyopaque) void) = undefined,
next: ?*AnyTaskWithExtraContext = null,
pub fn fromCallbackAutoDeinit(of: anytype, comptime callback: anytype) *AnyTaskWithExtraContext {
const TheTask = NewManaged(std.meta.Child(@TypeOf(of)), void, @field(std.meta.Child(@TypeOf(of)), callback));
const task = bun.default_allocator.create(AnyTaskWithExtraContext) catch bun.outOfMemory();
task.* = TheTask.init(of);
return task;
}
pub fn from(this: *@This(), of: anytype, comptime field: []const u8) *@This() {
const TheTask = New(std.meta.Child(@TypeOf(of)), void, @field(std.meta.Child(@TypeOf(of)), field));
this.* = TheTask.init(of);
return this;
}
pub fn run(this: *AnyTaskWithExtraContext, extra: *anyopaque) void {
@setRuntimeSafety(false);
const callback = this.callback;
const ctx = this.ctx;
callback(ctx.?, extra);
}
pub fn New(comptime Type: type, comptime ContextType: type, comptime Callback: anytype) type {
return struct {
pub fn init(ctx: *Type) AnyTaskWithExtraContext {
return AnyTaskWithExtraContext{
.callback = wrap,
.ctx = ctx,
};
}
pub fn wrap(this: ?*anyopaque, extra: ?*anyopaque) void {
@call(
.always_inline,
Callback,
.{
@as(*Type, @ptrCast(@alignCast(this.?))),
@as(*ContextType, @ptrCast(@alignCast(extra.?))),
},
);
}
};
}
pub fn NewManaged(comptime Type: type, comptime ContextType: type, comptime Callback: anytype) type {
return struct {
pub fn init(ctx: *Type) AnyTaskWithExtraContext {
return AnyTaskWithExtraContext{
.callback = wrap,
.ctx = ctx,
};
}
pub fn wrap(this: ?*anyopaque, extra: ?*anyopaque) void {
@call(
.always_inline,
Callback,
.{
@as(*Type, @ptrCast(@alignCast(this.?))),
@as(*ContextType, @ptrCast(@alignCast(extra.?))),
},
);
const anytask: *AnyTaskWithExtraContext = @fieldParentPtr("ctx", @as(*?*anyopaque, @ptrCast(@alignCast(this.?))));
bun.default_allocator.destroy(anytask);
}
};
}
};
pub const CppTask = opaque {
extern fn Bun__performTask(globalObject: *JSGlobalObject, task: *CppTask) void;
pub fn run(this: *CppTask, global: *JSGlobalObject) void {
JSC.markBinding(@src());
Bun__performTask(global, this);
}
};
pub const JSCScheduler = struct {
pub const JSCDeferredWorkTask = opaque {
extern fn Bun__runDeferredWork(task: *JSCScheduler.JSCDeferredWorkTask) void;
pub const run = Bun__runDeferredWork;
};
export fn Bun__eventLoop__incrementRefConcurrently(jsc_vm: *VirtualMachine, delta: c_int) void {
JSC.markBinding(@src());
if (delta > 0) {
jsc_vm.event_loop.refConcurrently();
} else {
jsc_vm.event_loop.unrefConcurrently();
}
}
export fn Bun__queueJSCDeferredWorkTaskConcurrently(jsc_vm: *VirtualMachine, task: *JSCScheduler.JSCDeferredWorkTask) void {
JSC.markBinding(@src());
var loop = jsc_vm.eventLoop();
loop.enqueueTaskConcurrent(ConcurrentTask.new(.{
.task = Task.init(task),
.next = null,
.auto_delete = true,
}));
}
comptime {
_ = Bun__eventLoop__incrementRefConcurrently;
_ = Bun__queueJSCDeferredWorkTaskConcurrently;
}
};
const ThreadSafeFunction = JSC.napi.ThreadSafeFunction;
const HotReloadTask = JSC.HotReloader.HotReloadTask;
const FSWatchTask = JSC.Node.FSWatcher.FSWatchTask;
const PollPendingModulesTask = JSC.ModuleLoader.AsyncModule.Queue;
// const PromiseTask = JSInternalPromise.Completion.PromiseTask;
const GetAddrInfoRequestTask = JSC.DNS.GetAddrInfoRequest.Task;
const JSCDeferredWorkTask = JSCScheduler.JSCDeferredWorkTask;
const Stat = JSC.Node.Async.stat;
const Lstat = JSC.Node.Async.lstat;
const Fstat = JSC.Node.Async.fstat;
const Open = JSC.Node.Async.open;
const ReadFile = JSC.Node.Async.readFile;
const WriteFile = JSC.Node.Async.writeFile;
const CopyFile = JSC.Node.Async.copyFile;
const Read = JSC.Node.Async.read;
const Write = JSC.Node.Async.write;
const Truncate = JSC.Node.Async.truncate;
const FTruncate = JSC.Node.Async.ftruncate;
const Readdir = JSC.Node.Async.readdir;
const ReaddirRecursive = JSC.Node.Async.readdir_recursive;
const Readv = JSC.Node.Async.readv;
const Writev = JSC.Node.Async.writev;
const Close = JSC.Node.Async.close;
const Rm = JSC.Node.Async.rm;
const Rmdir = JSC.Node.Async.rmdir;
const Chown = JSC.Node.Async.chown;
const FChown = JSC.Node.Async.fchown;
const Utimes = JSC.Node.Async.utimes;
const Lutimes = JSC.Node.Async.lutimes;
const Chmod = JSC.Node.Async.chmod;
const Fchmod = JSC.Node.Async.fchmod;
const Link = JSC.Node.Async.link;
const Symlink = JSC.Node.Async.symlink;
const Readlink = JSC.Node.Async.readlink;
const Realpath = JSC.Node.Async.realpath;
const Mkdir = JSC.Node.Async.mkdir;
const Fsync = JSC.Node.Async.fsync;
const Rename = JSC.Node.Async.rename;
const Fdatasync = JSC.Node.Async.fdatasync;
const Access = JSC.Node.Async.access;
const AppendFile = JSC.Node.Async.appendFile;
const Mkdtemp = JSC.Node.Async.mkdtemp;
const Exists = JSC.Node.Async.exists;
const Futimes = JSC.Node.Async.futimes;
const Lchmod = JSC.Node.Async.lchmod;
const Lchown = JSC.Node.Async.lchown;
const Unlink = JSC.Node.Async.unlink;
const BrotliDecoder = JSC.API.BrotliDecoder;
const BrotliEncoder = JSC.API.BrotliEncoder;
const ShellGlobTask = bun.shell.interpret.Interpreter.Expansion.ShellGlobTask;
const ShellRmTask = bun.shell.Interpreter.Builtin.Rm.ShellRmTask;
const ShellRmDirTask = bun.shell.Interpreter.Builtin.Rm.ShellRmTask.DirTask;
const ShellLsTask = bun.shell.Interpreter.Builtin.Ls.ShellLsTask;
const ShellMvCheckTargetTask = bun.shell.Interpreter.Builtin.Mv.ShellMvCheckTargetTask;
const ShellMvBatchedTask = bun.shell.Interpreter.Builtin.Mv.ShellMvBatchedTask;
const ShellMkdirTask = bun.shell.Interpreter.Builtin.Mkdir.ShellMkdirTask;
const ShellTouchTask = bun.shell.Interpreter.Builtin.Touch.ShellTouchTask;
const ShellCpTask = bun.shell.Interpreter.Builtin.Cp.ShellCpTask;
const ShellCondExprStatTask = bun.shell.Interpreter.CondExpr.ShellCondExprStatTask;
const ShellAsync = bun.shell.Interpreter.Async;
// const ShellIOReaderAsyncDeinit = bun.shell.Interpreter.IOReader.AsyncDeinit;
const ShellIOReaderAsyncDeinit = bun.shell.Interpreter.AsyncDeinitReader;
const ShellIOWriterAsyncDeinit = bun.shell.Interpreter.AsyncDeinitWriter;
const TimerObject = JSC.BunTimer.TimerObject;
const ProcessWaiterThreadTask = if (Environment.isPosix) bun.spawn.WaiterThread.ProcessQueue.ResultTask else opaque {};
const ProcessMiniEventLoopWaiterThreadTask = if (Environment.isPosix) bun.spawn.WaiterThread.ProcessMiniEventLoopQueue.ResultTask else opaque {};
const ShellAsyncSubprocessDone = bun.shell.Interpreter.Cmd.ShellAsyncSubprocessDone;
const RuntimeTranspilerStore = JSC.RuntimeTranspilerStore;
// Task.get(ReadFileTask) -> ?ReadFileTask
pub const Task = TaggedPointerUnion(.{
FetchTasklet,
AsyncGlobWalkTask,
AsyncTransformTask,
ReadFileTask,
CopyFilePromiseTask,
WriteFileTask,
AnyTask,
ManagedTask,
ShellIOReaderAsyncDeinit,
ShellIOWriterAsyncDeinit,
napi_async_work,
ThreadSafeFunction,
CppTask,
HotReloadTask,
PollPendingModulesTask,
GetAddrInfoRequestTask,
FSWatchTask,
JSCDeferredWorkTask,
Stat,
Lstat,
Fstat,
Open,
ReadFile,
WriteFile,
CopyFile,
Read,
Write,
Truncate,
FTruncate,
Readdir,
ReaddirRecursive,
Close,
Rm,
Rmdir,
Chown,
FChown,
Utimes,
Lutimes,
Chmod,
Fchmod,
Link,
Symlink,
Readlink,
Realpath,
Mkdir,
Fsync,
Fdatasync,
Writev,
Readv,
Rename,
Access,
AppendFile,
Mkdtemp,
Exists,
Futimes,
Lchmod,
Lchown,
Unlink,
BrotliEncoder,
BrotliDecoder,
ShellGlobTask,
ShellRmTask,
ShellRmDirTask,
ShellMvCheckTargetTask,
ShellMvBatchedTask,
ShellLsTask,
ShellMkdirTask,
ShellTouchTask,
ShellCpTask,
ShellCondExprStatTask,
ShellAsync,
ShellAsyncSubprocessDone,
TimerObject,
bun.shell.Interpreter.Builtin.Yes.YesTask,
ProcessWaiterThreadTask,
RuntimeTranspilerStore,
});
const UnboundedQueue = @import("./unbounded_queue.zig").UnboundedQueue;
pub const ConcurrentTask = struct {
task: if (JSC.is_bindgen) void else Task = undefined,
next: ?*ConcurrentTask = null,
auto_delete: bool = false,
pub const Queue = UnboundedQueue(ConcurrentTask, .next);
pub usingnamespace bun.New(@This());
pub const AutoDeinit = enum {
manual_deinit,
auto_deinit,
};
pub fn create(task: Task) *ConcurrentTask {
return ConcurrentTask.new(.{
.task = task,
.next = null,
.auto_delete = true,
});
}
pub fn createFrom(task: anytype) *ConcurrentTask {
JSC.markBinding(@src());
return create(Task.init(task));
}
pub fn fromCallback(ptr: anytype, comptime callback: anytype) *ConcurrentTask {
JSC.markBinding(@src());
return create(ManagedTask.New(std.meta.Child(@TypeOf(ptr)), callback).init(ptr));
}
pub fn from(this: *ConcurrentTask, of: anytype, auto_deinit: AutoDeinit) *ConcurrentTask {
JSC.markBinding(@src());
this.* = .{
.task = Task.init(of),
.next = null,
.auto_delete = auto_deinit == .auto_deinit,
};
return this;
}
};
// This type must be unique per JavaScript thread
pub const GarbageCollectionController = struct {
gc_timer: *uws.Timer = undefined,
gc_last_heap_size: usize = 0,
gc_last_heap_size_on_repeating_timer: usize = 0,
heap_size_didnt_change_for_repeating_timer_ticks_count: u8 = 0,
gc_timer_state: GCTimerState = GCTimerState.pending,
gc_repeating_timer: *uws.Timer = undefined,
gc_timer_interval: i32 = 0,
gc_repeating_timer_fast: bool = true,
disabled: bool = false,
pub fn init(this: *GarbageCollectionController, vm: *VirtualMachine) void {
const actual = uws.Loop.get();
this.gc_timer = uws.Timer.createFallthrough(actual, this);
this.gc_repeating_timer = uws.Timer.createFallthrough(actual, this);
if (comptime Environment.isDebug) {
if (bun.getenvZ("BUN_TRACK_LAST_FN_NAME") != null) {
vm.eventLoop().debug.track_last_fn_name = true;
}
}
var gc_timer_interval: i32 = 1000;
if (vm.bundler.env.get("BUN_GC_TIMER_INTERVAL")) |timer| {
if (std.fmt.parseInt(i32, timer, 10)) |parsed| {
if (parsed > 0) {
gc_timer_interval = parsed;
}
} else |_| {}
}
this.gc_timer_interval = gc_timer_interval;
this.disabled = vm.bundler.env.has("BUN_GC_TIMER_DISABLE");
if (!this.disabled)
this.gc_repeating_timer.set(this, onGCRepeatingTimer, gc_timer_interval, gc_timer_interval);
}
pub fn scheduleGCTimer(this: *GarbageCollectionController) void {
this.gc_timer_state = .scheduled;
this.gc_timer.set(this, onGCTimer, 16, 0);
}
pub fn bunVM(this: *GarbageCollectionController) *VirtualMachine {
return @alignCast(@fieldParentPtr("gc_controller", this));
}
pub fn onGCTimer(timer: *uws.Timer) callconv(.C) void {
var this = timer.as(*GarbageCollectionController);
if (this.disabled) return;
this.gc_timer_state = .run_on_next_tick;
}
// We want to always run GC once in awhile
// But if you have a long-running instance of Bun, you don't want the
// program constantly using CPU doing GC for no reason
//
// So we have two settings for this GC timer:
//
// - Fast: GC runs every 1 second
// - Slow: GC runs every 30 seconds
//
// When the heap size is increasing, we always switch to fast mode
// When the heap size has been the same or less for 30 seconds, we switch to slow mode
pub fn updateGCRepeatTimer(this: *GarbageCollectionController, comptime setting: @Type(.EnumLiteral)) void {
if (setting == .fast and !this.gc_repeating_timer_fast) {
this.gc_repeating_timer_fast = true;
this.gc_repeating_timer.set(this, onGCRepeatingTimer, this.gc_timer_interval, this.gc_timer_interval);
this.heap_size_didnt_change_for_repeating_timer_ticks_count = 0;
} else if (setting == .slow and this.gc_repeating_timer_fast) {
this.gc_repeating_timer_fast = false;
this.gc_repeating_timer.set(this, onGCRepeatingTimer, 30_000, 30_000);
this.heap_size_didnt_change_for_repeating_timer_ticks_count = 0;
}
}
pub fn onGCRepeatingTimer(timer: *uws.Timer) callconv(.C) void {
var this = timer.as(*GarbageCollectionController);
const prev_heap_size = this.gc_last_heap_size_on_repeating_timer;
this.performGC();
this.gc_last_heap_size_on_repeating_timer = this.gc_last_heap_size;
if (prev_heap_size == this.gc_last_heap_size_on_repeating_timer) {
this.heap_size_didnt_change_for_repeating_timer_ticks_count +|= 1;
if (this.heap_size_didnt_change_for_repeating_timer_ticks_count >= 30) {
// make the timer interval longer
this.updateGCRepeatTimer(.slow);
}
} else {
this.heap_size_didnt_change_for_repeating_timer_ticks_count = 0;
this.updateGCRepeatTimer(.fast);
}
}
pub fn processGCTimer(this: *GarbageCollectionController) void {
if (this.disabled) return;
var vm = this.bunVM().jsc;
this.processGCTimerWithHeapSize(vm, vm.blockBytesAllocated());
}
fn processGCTimerWithHeapSize(this: *GarbageCollectionController, vm: *JSC.VM, this_heap_size: usize) void {
const prev = this.gc_last_heap_size;
switch (this.gc_timer_state) {
.run_on_next_tick => {
// When memory usage is not stable, run the GC more.
if (this_heap_size != prev) {
this.scheduleGCTimer();
this.updateGCRepeatTimer(.fast);
} else {
this.gc_timer_state = .pending;
}
vm.collectAsync();
this.gc_last_heap_size = this_heap_size;
},
.pending => {
if (this_heap_size != prev) {
this.updateGCRepeatTimer(.fast);
if (this_heap_size > prev * 2) {
this.performGC();
} else {
this.scheduleGCTimer();
}
}
},
.scheduled => {
if (this_heap_size > prev * 2) {
this.updateGCRepeatTimer(.fast);
this.performGC();
}
},
}
}
pub fn performGC(this: *GarbageCollectionController) void {
if (this.disabled) return;
var vm = this.bunVM().jsc;
vm.collectAsync();
this.gc_last_heap_size = vm.blockBytesAllocated();
}
pub const GCTimerState = enum {
pending,
scheduled,
run_on_next_tick,
};
};
export fn Bun__tickWhilePaused(paused: *bool) void {
JSC.markBinding(@src());
JSC.VirtualMachine.get().eventLoop().tickWhilePaused(paused);
}
comptime {
if (!JSC.is_bindgen) {
_ = Bun__tickWhilePaused;
}
}
/// Sometimes, you have work that will be scheduled, cancelled, and rescheduled multiple times
/// The order of that work may not particularly matter.
///
/// An example of this is when writing to a file or network socket.
///
/// You want to balance:
/// 1) Writing as much as possible to the file/socket in as few system calls as possible
/// 2) Writing to the file/socket as soon as possible
///
/// That is a scheduling problem. How do you decide when to write to the file/socket? Developers
/// don't want to remember to call `flush` every time they write to a file/socket, but we don't
/// want them to have to think about buffering or not buffering either.
///
/// Our answer to this is the DeferredTaskQueue.
///
/// When you call write() when sending a streaming HTTP response, we don't actually write it immediately
/// by default. Instead, we wait until the end of the microtask queue to write it, unless either:
///
/// - The buffer is full
/// - The developer calls `flush` manually
///
/// But that means every time you call .write(), we have to check not only if the buffer is full, but also if
/// it previously had scheduled a write to the file/socket. So we use an ArrayHashMap to keep track of the
/// list of pointers which have a deferred task scheduled.
///
/// The DeferredTaskQueue is drained after the microtask queue, but before other tasks are executed. This avoids re-entrancy
/// issues with the event loop.
pub const DeferredTaskQueue = struct {
pub const DeferredRepeatingTask = *const (fn (*anyopaque) bool);
map: std.AutoArrayHashMapUnmanaged(?*anyopaque, DeferredRepeatingTask) = .{},
pub fn postTask(this: *DeferredTaskQueue, ctx: ?*anyopaque, task: DeferredRepeatingTask) bool {
const existing = this.map.getOrPutValue(bun.default_allocator, ctx, task) catch bun.outOfMemory();
return existing.found_existing;
}
pub fn unregisterTask(this: *DeferredTaskQueue, ctx: ?*anyopaque) bool {
return this.map.swapRemove(ctx);
}
pub fn run(this: *DeferredTaskQueue) void {
var i: usize = 0;
var last = this.map.count();
while (i < last) {
const key = this.map.keys()[i] orelse {
this.map.swapRemoveAt(i);
last = this.map.count();
continue;
};
if (!this.map.values()[i](key)) {
this.map.swapRemoveAt(i);
last = this.map.count();
} else {
i += 1;
}
}
}
pub fn deinit(this: *DeferredTaskQueue) void {
this.map.deinit(bun.default_allocator);
}
};
pub const EventLoop = struct {
tasks: Queue = undefined,
/// setImmediate() gets it's own two task queues
/// When you call `setImmediate` in JS, it queues to the start of the next tick
/// This is confusing, but that is how it works in Node.js.
///
/// So we have two queues:
/// - next_immediate_tasks: tasks that will run on the next tick
/// - immediate_tasks: tasks that will run on the current tick
///
/// Having two queues avoids infinite loops creating by calling `setImmediate` in a `setImmediate` callback.
immediate_tasks: Queue = undefined,
next_immediate_tasks: Queue = undefined,
concurrent_tasks: ConcurrentTask.Queue = ConcurrentTask.Queue{},
global: *JSGlobalObject = undefined,
virtual_machine: *JSC.VirtualMachine = undefined,
waker: ?Waker = null,
forever_timer: ?*uws.Timer = null,
deferred_tasks: DeferredTaskQueue = .{},
uws_loop: if (Environment.isWindows) *uws.Loop else void = undefined,
debug: Debug = .{},
entered_event_loop_count: isize = 0,
concurrent_ref: std.atomic.Value(i32) = std.atomic.Value(i32).init(0),
pub const Debug = if (Environment.isDebug) struct {
is_inside_tick_queue: bool = false,
js_call_count_outside_tick_queue: usize = 0,
drain_microtasks_count_outside_tick_queue: usize = 0,
_prev_is_inside_tick_queue: bool = false,
last_fn_name: bun.String = bun.String.empty,
track_last_fn_name: bool = false,
pub fn enter(this: *Debug) void {
this._prev_is_inside_tick_queue = this.is_inside_tick_queue;
this.is_inside_tick_queue = true;
this.js_call_count_outside_tick_queue = 0;
this.drain_microtasks_count_outside_tick_queue = 0;
}
pub fn exit(this: *Debug) void {
this.is_inside_tick_queue = this._prev_is_inside_tick_queue;
this._prev_is_inside_tick_queue = false;
this.js_call_count_outside_tick_queue = 0;
this.drain_microtasks_count_outside_tick_queue = 0;
this.last_fn_name.deref();
this.last_fn_name = bun.String.empty;
}
} else struct {
pub inline fn enter(_: Debug) void {}
pub inline fn exit(_: Debug) void {}
};
pub fn enter(this: *EventLoop) void {
log("enter() = {d}", .{this.entered_event_loop_count});
this.entered_event_loop_count += 1;
this.debug.enter();
}
pub fn exit(this: *EventLoop) void {
const count = this.entered_event_loop_count;
log("exit() = {d}", .{count - 1});
defer this.debug.exit();
if (count == 1) {
this.drainMicrotasksWithGlobal(this.global, this.virtual_machine.jsc);
}
this.entered_event_loop_count -= 1;
}
pub inline fn getVmImpl(this: *EventLoop) *JSC.VirtualMachine {
return this.virtual_machine;
}
pub fn pipeReadBuffer(this: *const EventLoop) []u8 {
return this.virtual_machine.rareData().pipeReadBuffer();
}
pub const Queue = std.fifo.LinearFifo(Task, .Dynamic);
const log = bun.Output.scoped(.EventLoop, false);
pub fn tickWhilePaused(this: *EventLoop, done: *bool) void {
while (!done.*) {
this.virtual_machine.event_loop_handle.?.tick();
}
}
extern fn JSC__JSGlobalObject__drainMicrotasks(*JSC.JSGlobalObject) void;
pub fn drainMicrotasksWithGlobal(this: *EventLoop, globalObject: *JSC.JSGlobalObject, jsc_vm: *JSC.VM) void {
JSC.markBinding(@src());
jsc_vm.releaseWeakRefs();
JSC__JSGlobalObject__drainMicrotasks(globalObject);
this.deferred_tasks.run();
if (comptime bun.Environment.isDebug) {
this.debug.drain_microtasks_count_outside_tick_queue += @as(usize, @intFromBool(!this.debug.is_inside_tick_queue));
}
}
pub fn drainMicrotasks(this: *EventLoop) void {
this.drainMicrotasksWithGlobal(this.global, this.virtual_machine.jsc);
}
/// When you call a JavaScript function from outside the event loop task
/// queue
///
/// It has to be wrapped in `runCallback` to ensure that microtasks are
/// drained and errors are handled.
///
/// Otherwise, you will risk a large number of microtasks being queued and
/// not being drained, which can lead to catastrophic memory usage and
/// application slowdown.
pub fn runCallback(this: *EventLoop, callback: JSC.JSValue, globalObject: *JSC.JSGlobalObject, thisValue: JSC.JSValue, arguments: []const JSC.JSValue) void {
this.enter();
defer this.exit();
const result = callback.callWithThis(globalObject, thisValue, arguments);
if (result.toError()) |err| {
_ = this.virtual_machine.uncaughtException(globalObject, err, false);
}
}
pub fn tickQueueWithCount(this: *EventLoop, comptime queue_name: []const u8) u32 {
var global = this.global;
const global_vm = global.vm();
var counter: usize = 0;
if (comptime Environment.isDebug) {
if (this.debug.js_call_count_outside_tick_queue > this.debug.drain_microtasks_count_outside_tick_queue) {
if (this.debug.track_last_fn_name) {
bun.Output.panic(
\\<b>{d} JavaScript functions<r> were called outside of the microtask queue without draining microtasks.
\\
\\Last function name: {}
\\
\\Use EventLoop.runCallback() to run JavaScript functions outside of the microtask queue.
\\
\\Failing to do this can lead to a large number of microtasks being queued and not being drained, which can lead to a large amount of memory being used and application slowdown.
,
.{
this.debug.js_call_count_outside_tick_queue - this.debug.drain_microtasks_count_outside_tick_queue,
this.debug.last_fn_name,
},
);
} else {
bun.Output.panic(
\\<b>{d} JavaScript functions<r> were called outside of the microtask queue without draining microtasks. To track the last function name, set the BUN_TRACK_LAST_FN_NAME environment variable.
\\
\\Use EventLoop.runCallback() to run JavaScript functions outside of the microtask queue.
\\
\\Failing to do this can lead to a large number of microtasks being queued and not being drained, which can lead to a large amount of memory being used and application slowdown.
,
.{this.debug.js_call_count_outside_tick_queue - this.debug.drain_microtasks_count_outside_tick_queue},
);
}
}
}
while (@field(this, queue_name).readItem()) |task| {
defer counter += 1;
switch (task.tag()) {
@field(Task.Tag, typeBaseName(@typeName(ShellAsync))) => {
var shell_ls_task: *ShellAsync = task.get(ShellAsync).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellAsyncSubprocessDone))) => {
var shell_ls_task: *ShellAsyncSubprocessDone = task.get(ShellAsyncSubprocessDone).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellIOWriterAsyncDeinit))) => {
var shell_ls_task: *ShellIOWriterAsyncDeinit = task.get(ShellIOWriterAsyncDeinit).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellIOReaderAsyncDeinit))) => {
var shell_ls_task: *ShellIOReaderAsyncDeinit = task.get(ShellIOReaderAsyncDeinit).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellCondExprStatTask))) => {
var shell_ls_task: *ShellCondExprStatTask = task.get(ShellCondExprStatTask).?;
shell_ls_task.task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellCpTask))) => {
var shell_ls_task: *ShellCpTask = task.get(ShellCpTask).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellTouchTask))) => {
var shell_ls_task: *ShellTouchTask = task.get(ShellTouchTask).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellMkdirTask))) => {
var shell_ls_task: *ShellMkdirTask = task.get(ShellMkdirTask).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellLsTask))) => {
var shell_ls_task: *ShellLsTask = task.get(ShellLsTask).?;
shell_ls_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellMvBatchedTask))) => {
var shell_mv_batched_task: *ShellMvBatchedTask = task.get(ShellMvBatchedTask).?;
shell_mv_batched_task.task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellMvCheckTargetTask))) => {
var shell_mv_check_target_task: *ShellMvCheckTargetTask = task.get(ShellMvCheckTargetTask).?;
shell_mv_check_target_task.task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellRmTask))) => {
var shell_rm_task: *ShellRmTask = task.get(ShellRmTask).?;
shell_rm_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellRmDirTask))) => {
var shell_rm_task: *ShellRmDirTask = task.get(ShellRmDirTask).?;
shell_rm_task.runFromMainThread();
},
@field(Task.Tag, typeBaseName(@typeName(ShellGlobTask))) => {
var shell_glob_task: *ShellGlobTask = task.get(ShellGlobTask).?;
shell_glob_task.runFromMainThread();
shell_glob_task.deinit();
},
.FetchTasklet => {
var fetch_task: *Fetch.FetchTasklet = task.get(Fetch.FetchTasklet).?;
fetch_task.onProgressUpdate();
},
@field(Task.Tag, @typeName(AsyncGlobWalkTask)) => {
var globWalkTask: *AsyncGlobWalkTask = task.get(AsyncGlobWalkTask).?;
globWalkTask.*.runFromJS();
globWalkTask.deinit();
},
@field(Task.Tag, @typeName(AsyncTransformTask)) => {
var transform_task: *AsyncTransformTask = task.get(AsyncTransformTask).?;
transform_task.*.runFromJS();
transform_task.deinit();
},
@field(Task.Tag, @typeName(CopyFilePromiseTask)) => {
var transform_task: *CopyFilePromiseTask = task.get(CopyFilePromiseTask).?;
transform_task.*.runFromJS();
transform_task.deinit();
},
@field(Task.Tag, typeBaseName(@typeName(JSC.napi.napi_async_work))) => {
const transform_task: *JSC.napi.napi_async_work = task.get(JSC.napi.napi_async_work).?;
transform_task.*.runFromJS();
},
.ThreadSafeFunction => {