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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_LIBPLATFORM_LIBPLATFORM_H_
#define V8_LIBPLATFORM_LIBPLATFORM_H_
#include <memory>
#include "libplatform/libplatform-export.h"
#include "libplatform/v8-tracing.h"
#include "v8-platform.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
namespace v8 {
namespace platform {
enum class IdleTaskSupport { kDisabled, kEnabled };
enum class InProcessStackDumping { kDisabled, kEnabled };
enum class MessageLoopBehavior : bool {
kDoNotWait = false,
kWaitForWork = true
};
/**
* 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.
*/
V8_PLATFORM_EXPORT 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 = {});
/**
* The same as NewDefaultPlatform but disables the worker thread pool.
* It must be used with the --single-threaded V8 flag.
*/
V8_PLATFORM_EXPORT 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 = {});
/**
* 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|.
*/
V8_PLATFORM_EXPORT std::unique_ptr<v8::JobHandle> NewDefaultJobHandle(
v8::Platform* platform, v8::TaskPriority priority,
std::unique_ptr<v8::JobTask> job_task, size_t num_worker_threads);
/**
* 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|.
*/
V8_PLATFORM_EXPORT bool PumpMessageLoop(
v8::Platform* platform, v8::Isolate* isolate,
MessageLoopBehavior behavior = MessageLoopBehavior::kDoNotWait);
/**
* 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|.
*/
V8_PLATFORM_EXPORT void RunIdleTasks(v8::Platform* platform,
v8::Isolate* isolate,
double idle_time_in_seconds);
/**
* 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|.
*
*/
V8_PLATFORM_EXPORT void NotifyIsolateShutdown(v8::Platform* platform,
Isolate* isolate);
} // namespace platform
} // namespace v8
#endif // V8_LIBPLATFORM_LIBPLATFORM_H_
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