v8::platform Namespace Reference

Namespaces
namespace	tracing

Enumerations
enum class	IdleTaskSupport { kDisabled , kEnabled }
enum class	InProcessStackDumping { kDisabled , kEnabled }
enum class	MessageLoopBehavior : bool { kDoNotWait = false , kWaitForWork = true }
enum class	PriorityMode : bool { kDontApply , kApply }

Functions
std::unique_ptr< v8::Platform >	NewDefaultPlatform (int thread_pool_size=0, IdleTaskSupport idle_task_support=IdleTaskSupport::kDisabled, InProcessStackDumping in_process_stack_dumping=InProcessStackDumping::kDisabled, std::unique_ptr< v8::TracingController > tracing_controller={}, PriorityMode priority_mode=PriorityMode::kDontApply)
std::unique_ptr< v8::Platform >	NewSingleThreadedDefaultPlatform (IdleTaskSupport idle_task_support=IdleTaskSupport::kDisabled, InProcessStackDumping in_process_stack_dumping=InProcessStackDumping::kDisabled, std::unique_ptr< v8::TracingController > tracing_controller={})
std::unique_ptr< v8::JobHandle >	NewDefaultJobHandle (v8::Platform *platform, v8::TaskPriority priority, std::unique_ptr< v8::JobTask > job_task, size_t num_worker_threads)
bool	PumpMessageLoop (v8::Platform *platform, v8::Isolate *isolate, MessageLoopBehavior behavior=MessageLoopBehavior::kDoNotWait)
void	RunIdleTasks (v8::Platform *platform, v8::Isolate *isolate, double idle_time_in_seconds)
void	NotifyIsolateShutdown (v8::Platform *platform, Isolate *isolate)

Enumeration Type Documentation

IdleTaskSupport

enum class v8::platform::IdleTaskSupport

strong

Enumerator
kDisabled
kEnabled

InProcessStackDumping

enum class v8::platform::InProcessStackDumping

strong

Enumerator
kDisabled
kEnabled

MessageLoopBehavior

enum class v8::platform::MessageLoopBehavior : bool

strong

Enumerator
kDoNotWait
kWaitForWork

PriorityMode

enum class v8::platform::PriorityMode : bool

strong

Enumerator
kDontApply
kApply

Function Documentation

NewDefaultJobHandle()

std::unique_ptr< v8::JobHandle > v8::platform::NewDefaultJobHandle	(	v8::Platform *	platform,
		v8::TaskPriority	priority,
		std::unique_ptr< v8::JobTask >	job_task,
		size_t	num_worker_threads
	)

Returns a new instance of the default v8::JobHandle implementation.

The job will be executed by spawning up to |num_worker_threads| many worker threads on the provided |platform| with the given |priority|.

NewDefaultPlatform()

std::unique_ptr< v8::Platform > v8::platform::NewDefaultPlatform	(	int	thread_pool_size = 0,
		IdleTaskSupport	idle_task_support = IdleTaskSupport::kDisabled,
		InProcessStackDumping	in_process_stack_dumping = InProcessStackDumping::kDisabled,
		std::unique_ptr< v8::TracingController >	tracing_controller = {},
		PriorityMode	priority_mode = PriorityMode::kDontApply
	)

Returns a new instance of the default v8::Platform implementation.

The caller will take ownership of the returned pointer. |thread_pool_size| is the number of worker threads to allocate for background jobs. If a value of zero is passed, a suitable default based on the current number of processors online will be chosen. If |idle_task_support| is enabled then the platform will accept idle tasks (IdleTasksEnabled will return true) and will rely on the embedder calling v8::platform::RunIdleTasks to process the idle tasks. If |tracing_controller| is nullptr, the default platform will create a v8::platform::TracingController instance and use it. If |priority_mode| is PriorityMode::kApply, the default platform will use multiple task queues executed by threads different system-level priorities (where available) to schedule tasks.

Examples

process.cc, and shell.cc.

NewSingleThreadedDefaultPlatform()

std::unique_ptr< v8::Platform > v8::platform::NewSingleThreadedDefaultPlatform	(	IdleTaskSupport	idle_task_support = IdleTaskSupport::kDisabled,
		InProcessStackDumping	in_process_stack_dumping = InProcessStackDumping::kDisabled,
		std::unique_ptr< v8::TracingController >	tracing_controller = {}
	)

The same as NewDefaultPlatform but disables the worker thread pool. It must be used with the –single-threaded V8 flag.

NotifyIsolateShutdown()

void v8::platform::NotifyIsolateShutdown	(	v8::Platform *	platform,
		Isolate *	isolate
	)

Notifies the given platform about the Isolate getting deleted soon. Has to be called for all Isolates which are deleted - unless we're shutting down the platform.

The |platform| has to be created using |NewDefaultPlatform|.

PumpMessageLoop()

bool v8::platform::PumpMessageLoop	(	v8::Platform *	platform,
		v8::Isolate *	isolate,
		MessageLoopBehavior	behavior = MessageLoopBehavior::kDoNotWait
	)

Pumps the message loop for the given isolate.

The caller has to make sure that this is called from the right thread. Returns true if a task was executed, and false otherwise. If the call to PumpMessageLoop is nested within another call to PumpMessageLoop, only nestable tasks may run. Otherwise, any task may run. Unless requested through the |behavior| parameter, this call does not block if no task is pending. The |platform| has to be created using |NewDefaultPlatform|.

Examples

process.cc, and shell.cc.

RunIdleTasks()

void v8::platform::RunIdleTasks	(	v8::Platform *	platform,
		v8::Isolate *	isolate,
		double	idle_time_in_seconds
	)

Runs pending idle tasks for at most |idle_time_in_seconds| seconds.

The caller has to make sure that this is called from the right thread. This call does not block if no task is pending. The |platform| has to be created using |NewDefaultPlatform|.