gecko-dev/dom/workers/Workers.h

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5.8 KiB
C++

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_workers_workers_h__
#define mozilla_dom_workers_workers_h__
#include "jsapi.h"
#include "mozilla/Attributes.h"
#include "mozilla/Mutex.h"
#include <stdint.h>
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsDebug.h"
#include "nsString.h"
#define BEGIN_WORKERS_NAMESPACE \
namespace mozilla { namespace dom { namespace workers {
#define END_WORKERS_NAMESPACE \
} /* namespace workers */ } /* namespace dom */ } /* namespace mozilla */
#define USING_WORKERS_NAMESPACE \
using namespace mozilla::dom::workers;
#define WORKERS_SHUTDOWN_TOPIC "web-workers-shutdown"
class nsIScriptContext;
class nsPIDOMWindow;
BEGIN_WORKERS_NAMESPACE
class WorkerPrivate;
struct PrivatizableBase
{ };
#ifdef DEBUG
void
AssertIsOnMainThread();
#else
inline void
AssertIsOnMainThread()
{ }
#endif
struct JSSettings
{
enum {
// All the GC parameters that we support.
JSSettings_JSGC_MAX_BYTES = 0,
JSSettings_JSGC_MAX_MALLOC_BYTES,
JSSettings_JSGC_HIGH_FREQUENCY_TIME_LIMIT,
JSSettings_JSGC_LOW_FREQUENCY_HEAP_GROWTH,
JSSettings_JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN,
JSSettings_JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX,
JSSettings_JSGC_HIGH_FREQUENCY_LOW_LIMIT,
JSSettings_JSGC_HIGH_FREQUENCY_HIGH_LIMIT,
JSSettings_JSGC_ALLOCATION_THRESHOLD,
JSSettings_JSGC_SLICE_TIME_BUDGET,
JSSettings_JSGC_DYNAMIC_HEAP_GROWTH,
JSSettings_JSGC_DYNAMIC_MARK_SLICE,
// JSGC_MODE not supported
// This must be last so that we get an accurate count.
kGCSettingsArraySize
};
struct JSGCSetting
{
JSGCParamKey key;
uint32_t value;
JSGCSetting()
: key(static_cast<JSGCParamKey>(-1)), value(0)
{ }
bool
IsSet() const
{
return key != static_cast<JSGCParamKey>(-1);
}
void
Unset()
{
key = static_cast<JSGCParamKey>(-1);
value = 0;
}
};
// There are several settings that we know we need so it makes sense to
// preallocate here.
typedef JSGCSetting JSGCSettingsArray[kGCSettingsArraySize];
// Settings that change based on chrome/content context.
struct JSContentChromeSettings
{
uint32_t options;
int32_t maxScriptRuntime;
JSContentChromeSettings()
: options(0), maxScriptRuntime(0)
{ }
};
JSContentChromeSettings chrome;
JSContentChromeSettings content;
JSGCSettingsArray gcSettings;
bool jitHardening;
#ifdef JS_GC_ZEAL
uint8_t gcZeal;
uint32_t gcZealFrequency;
#endif
JSSettings()
: jitHardening(false)
#ifdef JS_GC_ZEAL
, gcZeal(0), gcZealFrequency(0)
#endif
{
for (uint32_t index = 0; index < ArrayLength(gcSettings); index++) {
new (gcSettings + index) JSGCSetting();
}
}
bool
ApplyGCSetting(JSGCParamKey aKey, uint32_t aValue)
{
JSSettings::JSGCSetting* firstEmptySetting = nullptr;
JSSettings::JSGCSetting* foundSetting = nullptr;
for (uint32_t index = 0; index < ArrayLength(gcSettings); index++) {
JSSettings::JSGCSetting& setting = gcSettings[index];
if (setting.key == aKey) {
foundSetting = &setting;
break;
}
if (!firstEmptySetting && !setting.IsSet()) {
firstEmptySetting = &setting;
}
}
if (aValue) {
if (!foundSetting) {
foundSetting = firstEmptySetting;
if (!foundSetting) {
NS_ERROR("Not enough space for this value!");
return false;
}
}
foundSetting->key = aKey;
foundSetting->value = aValue;
return true;
}
if (foundSetting) {
foundSetting->Unset();
return true;
}
return false;
}
};
// All of these are implemented in RuntimeService.cpp
bool
ResolveWorkerClasses(JSContext* aCx, JS::Handle<JSObject*> aObj, JS::Handle<jsid> aId,
unsigned aFlags, JS::MutableHandle<JSObject*> aObjp);
void
CancelWorkersForWindow(JSContext* aCx, nsPIDOMWindow* aWindow);
void
SuspendWorkersForWindow(JSContext* aCx, nsPIDOMWindow* aWindow);
void
ResumeWorkersForWindow(nsIScriptContext* aCx, nsPIDOMWindow* aWindow);
class WorkerTask {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WorkerTask)
virtual ~WorkerTask() { }
virtual bool RunTask(JSContext* aCx) = 0;
};
class WorkerCrossThreadDispatcher {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WorkerCrossThreadDispatcher)
WorkerCrossThreadDispatcher(WorkerPrivate* aPrivate) :
mMutex("WorkerCrossThreadDispatcher"), mPrivate(aPrivate) {}
void Forget()
{
mozilla::MutexAutoLock lock(mMutex);
mPrivate = nullptr;
}
/**
* Generically useful function for running a bit of C++ code on the worker
* thread.
*/
bool PostTask(WorkerTask* aTask);
protected:
friend class WorkerPrivate;
// Must be acquired *before* the WorkerPrivate's mutex, when they're both held.
mozilla::Mutex mMutex;
WorkerPrivate* mPrivate;
};
WorkerCrossThreadDispatcher*
GetWorkerCrossThreadDispatcher(JSContext* aCx, jsval aWorker);
// Random unique constant to facilitate JSPrincipal debugging
const uint32_t kJSPrincipalsDebugToken = 0x7e2df9d2;
namespace exceptions {
// Implemented in Exceptions.cpp
void
ThrowDOMExceptionForNSResult(JSContext* aCx, nsresult aNSResult);
} // namespace exceptions
// Throws the JSMSG_GETTER_ONLY exception. This shouldn't be used going
// forward -- getter-only properties should just use JS_PSG for the setter
// (implying no setter at all), which will not throw when set in non-strict
// code but will in strict code. Old code should use this only for temporary
// compatibility reasons.
extern bool
GetterOnlyJSNative(JSContext* aCx, unsigned aArgc, JS::Value* aVp);
END_WORKERS_NAMESPACE
#endif // mozilla_dom_workers_workers_h__