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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_BIN_EVENTHANDLER_H_
#define RUNTIME_BIN_EVENTHANDLER_H_
#include "bin/builtin.h"
#include "bin/dartutils.h"
#include "bin/isolate_data.h"
#include "platform/hashmap.h"
#include "platform/priority_queue.h"
namespace dart {
namespace bin {
// Flags used to provide information and actions to the eventhandler
// when sending a message about a file descriptor. These flags should
// be kept in sync with the constants in socket_patch.dart. For more
// information see the comments in socket_patch.dart
enum MessageFlags {
kInEvent = 0,
kOutEvent = 1,
kErrorEvent = 2,
kCloseEvent = 3,
kDestroyedEvent = 4,
kCloseCommand = 8,
kShutdownReadCommand = 9,
kShutdownWriteCommand = 10,
kReturnTokenCommand = 11,
kSetEventMaskCommand = 12,
kListeningSocket = 16,
kPipe = 17,
kSignalSocket = 18,
};
// clang-format off
#define COMMAND_MASK ((1 << kCloseCommand) | \
(1 << kShutdownReadCommand) | \
(1 << kShutdownWriteCommand) | \
(1 << kReturnTokenCommand) | \
(1 << kSetEventMaskCommand))
#define EVENT_MASK ((1 << kInEvent) | \
(1 << kOutEvent) | \
(1 << kErrorEvent) | \
(1 << kCloseEvent) | \
(1 << kDestroyedEvent))
#define IS_COMMAND(data, command_bit) \
((data & COMMAND_MASK) == (1 << command_bit)) // NOLINT
#define IS_EVENT(data, event_bit) \
((data & EVENT_MASK) == (1 << event_bit)) // NOLINT
#define IS_IO_EVENT(data) \
((data & (1 << kInEvent | 1 << kOutEvent | 1 << kCloseEvent)) != 0 && \
(data & ~(1 << kInEvent | 1 << kOutEvent | 1 << kCloseEvent)) == 0)
#define IS_LISTENING_SOCKET(data) \
((data & (1 << kListeningSocket)) != 0) // NOLINT
#define IS_SIGNAL_SOCKET(data) \
((data & (1 << kSignalSocket)) != 0) // NOLINT
#define TOKEN_COUNT(data) (data & ((1 << kCloseCommand) - 1))
// clang-format on
class TimeoutQueue {
public:
TimeoutQueue() {}
~TimeoutQueue() {
while (HasTimeout())
RemoveCurrent();
}
bool HasTimeout() const { return !timeouts_.IsEmpty(); }
int64_t CurrentTimeout() const {
ASSERT(!timeouts_.IsEmpty());
return timeouts_.Minimum().priority;
}
Dart_Port CurrentPort() const {
ASSERT(!timeouts_.IsEmpty());
return timeouts_.Minimum().value;
}
void RemoveCurrent() { timeouts_.RemoveMinimum(); }
void UpdateTimeout(Dart_Port port, int64_t timeout) {
if (timeout < 0) {
timeouts_.RemoveByValue(port);
} else {
timeouts_.InsertOrChangePriority(timeout, port);
}
}
private:
PriorityQueue<int64_t, Dart_Port> timeouts_;
DISALLOW_COPY_AND_ASSIGN(TimeoutQueue);
};
class InterruptMessage {
public:
intptr_t id;
Dart_Port dart_port;
int64_t data;
};
static const int kInterruptMessageSize = sizeof(InterruptMessage);
static const int kInfinityTimeout = -1;
static const int kTimerId = -1;
static const int kShutdownId = -2;
template <typename T>
class CircularLinkedList {
public:
CircularLinkedList() : head_(NULL) {}
typedef void (*ClearFun)(void* value);
// Returns true if the list was empty.
bool Add(T t) {
Entry* e = new Entry(t);
if (head_ == NULL) {
// Empty list, make e head, and point to itself.
e->next_ = e;
e->prev_ = e;
head_ = e;
return true;
} else {
// Insert e as the last element in the list.
e->prev_ = head_->prev_;
e->next_ = head_;
e->prev_->next_ = e;
head_->prev_ = e;
return false;
}
}
void RemoveHead(ClearFun clear = NULL) {
ASSERT(head_ != NULL);
Entry* e = head_;
if (e->next_ == e) {
head_ = NULL;
} else {
e->prev_->next_ = e->next_;
e->next_->prev_ = e->prev_;
head_ = e->next_;
}
if (clear != NULL) {
clear(reinterpret_cast<void*>(e->t));
}
delete e;
}
void Remove(T item) {
if (head_ == NULL) {
return;
} else if (head_ == head_->next_) {
if (head_->t == item) {
delete head_;
head_ = NULL;
return;
}
} else {
Entry* current = head_;
do {
if (current->t == item) {
Entry* next = current->next_;
Entry* prev = current->prev_;
prev->next_ = next;
next->prev_ = prev;
if (current == head_) {
head_ = head_->next_;
}
delete current;
return;
}
current = current->next_;
} while (current != head_);
}
}
void RemoveAll(ClearFun clear = NULL) {
while (HasHead()) {
RemoveHead(clear);
}
}
T head() const { return head_->t; }
bool HasHead() const { return head_ != NULL; }
void Rotate() {
if (head_ != NULL) {
ASSERT(head_->next_ != NULL);
head_ = head_->next_;
}
}
private:
struct Entry {
explicit Entry(const T& t) : t(t), next_(NULL), prev_(NULL) {}
const T t;
Entry* next_;
Entry* prev_;
};
Entry* head_;
DISALLOW_COPY_AND_ASSIGN(CircularLinkedList);
};
class DescriptorInfoBase {
public:
explicit DescriptorInfoBase(intptr_t fd) : fd_(fd) { ASSERT(fd_ != -1); }
virtual ~DescriptorInfoBase() {}
// The OS descriptor.
intptr_t fd() { return fd_; }
// Whether this descriptor refers to an underlying listening OS socket.
virtual bool IsListeningSocket() const = 0;
// Inserts or updates a new Dart_Port which is interested in events specified
// in `mask`.
virtual void SetPortAndMask(Dart_Port port, intptr_t mask) = 0;
// Removes a port from the interested listeners.
virtual void RemovePort(Dart_Port port) = 0;
// Removes all ports from the interested listeners.
virtual void RemoveAllPorts() = 0;
// Returns a port to which `events_ready` can be sent to. It will also
// decrease the token count by 1 for this port.
virtual Dart_Port NextNotifyDartPort(intptr_t events_ready) = 0;
// Will post `data` to all known Dart_Ports. It will also decrease the token
// count by 1 for all ports.
virtual void NotifyAllDartPorts(uintptr_t events) = 0;
// Returns `count` tokens for the given port.
virtual void ReturnTokens(Dart_Port port, int count) = 0;
// Returns the union of event masks of all ports. If a port has a non-positive
// token count it's mask is assumed to be 0.
virtual intptr_t Mask() = 0;
// Closes this descriptor.
virtual void Close() = 0;
protected:
intptr_t fd_;
private:
DISALLOW_COPY_AND_ASSIGN(DescriptorInfoBase);
};
// Describes a OS descriptor (e.g. file descriptor on linux or HANDLE on
// windows) which is connected to a single Dart_Port.
//
// Subclasses of this class can be e.g. connected tcp sockets.
template <typename DI>
class DescriptorInfoSingleMixin : public DI {
private:
static const int kTokenCount = 16;
public:
DescriptorInfoSingleMixin(intptr_t fd, bool disable_tokens)
: DI(fd),
port_(0),
tokens_(kTokenCount),
mask_(0),
disable_tokens_(disable_tokens) {}
virtual ~DescriptorInfoSingleMixin() {}
virtual bool IsListeningSocket() const { return false; }
virtual void SetPortAndMask(Dart_Port port, intptr_t mask) {
ASSERT(port_ == 0 || port == port_);
port_ = port;
mask_ = mask;
}
virtual void RemovePort(Dart_Port port) {
// TODO(dart:io): Find out where we call RemovePort() with the invalid
// port. Afterwards remove the part in the ASSERT here.
ASSERT(port_ == 0 || port_ == port);
port_ = 0;
mask_ = 0;
}
virtual void RemoveAllPorts() {
port_ = 0;
mask_ = 0;
}
virtual Dart_Port NextNotifyDartPort(intptr_t events_ready) {
ASSERT(IS_IO_EVENT(events_ready) ||
IS_EVENT(events_ready, kDestroyedEvent));
if (!disable_tokens_) {
tokens_--;
}
return port_;
}
virtual void NotifyAllDartPorts(uintptr_t events) {
// Unexpected close, asynchronous destroy or error events are the only
// ones we broadcast to all listeners.
ASSERT(IS_EVENT(events, kCloseEvent) || IS_EVENT(events, kErrorEvent) ||
IS_EVENT(events, kDestroyedEvent));
if (port_ != 0) {
DartUtils::PostInt32(port_, events);
}
if (!disable_tokens_) {
tokens_--;
}
}
virtual void ReturnTokens(Dart_Port port, int count) {
ASSERT(port_ == port);
if (!disable_tokens_) {
tokens_ += count;
}
ASSERT(tokens_ <= kTokenCount);
}
virtual intptr_t Mask() {
if (tokens_ <= 0) {
return 0;
}
return mask_;
}
virtual void Close() { DI::Close(); }
private:
Dart_Port port_;
int tokens_;
intptr_t mask_;
bool disable_tokens_;
DISALLOW_COPY_AND_ASSIGN(DescriptorInfoSingleMixin);
};
// Describes a OS descriptor (e.g. file descriptor on linux or HANDLE on
// windows) which is connected to multiple Dart_Port's.
//
// Subclasses of this class can be e.g. a listening socket which multiple
// isolates are listening on.
template <typename DI>
class DescriptorInfoMultipleMixin : public DI {
private:
static const int kTokenCount = 4;
static bool SamePortValue(void* key1, void* key2) {
return reinterpret_cast<Dart_Port>(key1) ==
reinterpret_cast<Dart_Port>(key2);
}
static uint32_t GetHashmapHashFromPort(Dart_Port port) {
return static_cast<uint32_t>(port & 0xFFFFFFFF);
}
static void* GetHashmapKeyFromPort(Dart_Port port) {
return reinterpret_cast<void*>(port);
}
static bool IsReadingMask(intptr_t mask) {
if (mask == (1 << kInEvent)) {
return true;
} else {
ASSERT(mask == 0);
return false;
}
}
struct PortEntry {
Dart_Port dart_port;
intptr_t is_reading;
intptr_t token_count;
bool IsReady() { return token_count > 0 && is_reading != 0; }
};
public:
DescriptorInfoMultipleMixin(intptr_t fd, bool disable_tokens)
: DI(fd),
tokens_map_(&SamePortValue, kTokenCount),
disable_tokens_(disable_tokens) {}
virtual ~DescriptorInfoMultipleMixin() { RemoveAllPorts(); }
virtual bool IsListeningSocket() const { return true; }
virtual void SetPortAndMask(Dart_Port port, intptr_t mask) {
SimpleHashMap::Entry* entry = tokens_map_.Lookup(
GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), true);
PortEntry* pentry;
if (entry->value == NULL) {
pentry = new PortEntry();
pentry->dart_port = port;
pentry->token_count = kTokenCount;
pentry->is_reading = IsReadingMask(mask);
entry->value = reinterpret_cast<void*>(pentry);
if (pentry->IsReady()) {
active_readers_.Add(pentry);
}
} else {
pentry = reinterpret_cast<PortEntry*>(entry->value);
bool was_ready = pentry->IsReady();
pentry->is_reading = IsReadingMask(mask);
bool is_ready = pentry->IsReady();
if (was_ready && !is_ready) {
active_readers_.Remove(pentry);
} else if (!was_ready && is_ready) {
active_readers_.Add(pentry);
}
}
#ifdef DEBUG
// To ensure that all readers are ready.
int ready_count = 0;
if (active_readers_.HasHead()) {
PortEntry* root = reinterpret_cast<PortEntry*>(active_readers_.head());
PortEntry* current = root;
do {
ASSERT(current->IsReady());
ready_count++;
active_readers_.Rotate();
current = active_readers_.head();
} while (current != root);
}
for (SimpleHashMap::Entry* entry = tokens_map_.Start(); entry != NULL;
entry = tokens_map_.Next(entry)) {
PortEntry* pentry = reinterpret_cast<PortEntry*>(entry->value);
if (pentry->IsReady()) {
ready_count--;
}
}
// Ensure all ready items are in `active_readers_`.
ASSERT(ready_count == 0);
#endif
}
virtual void RemovePort(Dart_Port port) {
SimpleHashMap::Entry* entry = tokens_map_.Lookup(
GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), false);
if (entry != NULL) {
PortEntry* pentry = reinterpret_cast<PortEntry*>(entry->value);
if (pentry->IsReady()) {
active_readers_.Remove(pentry);
}
tokens_map_.Remove(GetHashmapKeyFromPort(port),
GetHashmapHashFromPort(port));
delete pentry;
} else {
// NOTE: This is a listening socket which has been immediately closed.
//
// If a listening socket is not listened on, the event handler does not
// know about it beforehand. So the first time the event handler knows
// about it, is when it is supposed to be closed. We therefore do nothing
// here.
//
// But whether to close it, depends on whether other isolates have it open
// as well or not.
}
}
virtual void RemoveAllPorts() {
for (SimpleHashMap::Entry* entry = tokens_map_.Start(); entry != NULL;
entry = tokens_map_.Next(entry)) {
PortEntry* pentry = reinterpret_cast<PortEntry*>(entry->value);
entry->value = NULL;
active_readers_.Remove(pentry);
delete pentry;
}
tokens_map_.Clear();
active_readers_.RemoveAll(DeletePortEntry);
}
virtual Dart_Port NextNotifyDartPort(intptr_t events_ready) {
// We're only sending `kInEvents` if there are multiple listeners (which is
// listening socktes).
ASSERT(IS_EVENT(events_ready, kInEvent) ||
IS_EVENT(events_ready, kDestroyedEvent));
if (active_readers_.HasHead()) {
PortEntry* pentry = reinterpret_cast<PortEntry*>(active_readers_.head());
// Update token count.
if (!disable_tokens_) {
pentry->token_count--;
}
if (pentry->token_count <= 0) {
active_readers_.RemoveHead();
} else {
active_readers_.Rotate();
}
return pentry->dart_port;
}
return 0;
}
virtual void NotifyAllDartPorts(uintptr_t events) {
// Unexpected close, asynchronous destroy or error events are the only
// ones we broadcast to all listeners.
ASSERT(IS_EVENT(events, kCloseEvent) || IS_EVENT(events, kErrorEvent) ||
IS_EVENT(events, kDestroyedEvent));
for (SimpleHashMap::Entry* entry = tokens_map_.Start(); entry != NULL;
entry = tokens_map_.Next(entry)) {
PortEntry* pentry = reinterpret_cast<PortEntry*>(entry->value);
DartUtils::PostInt32(pentry->dart_port, events);
// Update token count.
bool was_ready = pentry->IsReady();
if (!disable_tokens_) {
pentry->token_count--;
}
if (was_ready && (pentry->token_count <= 0)) {
active_readers_.Remove(pentry);
}
}
}
virtual void ReturnTokens(Dart_Port port, int count) {
SimpleHashMap::Entry* entry = tokens_map_.Lookup(
GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), false);
ASSERT(entry != NULL);
PortEntry* pentry = reinterpret_cast<PortEntry*>(entry->value);
bool was_ready = pentry->IsReady();
if (!disable_tokens_) {
pentry->token_count += count;
}
ASSERT(pentry->token_count <= kTokenCount);
bool is_ready = pentry->IsReady();
if (!was_ready && is_ready) {
active_readers_.Add(pentry);
}
}
virtual intptr_t Mask() {
if (active_readers_.HasHead()) {
return 1 << kInEvent;
}
return 0;
}
virtual void Close() { DI::Close(); }
private:
static void DeletePortEntry(void* data) {
PortEntry* entry = reinterpret_cast<PortEntry*>(data);
delete entry;
}
// The [Dart_Port]s which are not paused (i.e. are interested in read events,
// i.e. `mask == (1 << kInEvent)`) and we have enough tokens to communicate
// with them.
CircularLinkedList<PortEntry*> active_readers_;
// A convenience mapping:
// Dart_Port -> struct PortEntry { dart_port, mask, token_count }
SimpleHashMap tokens_map_;
bool disable_tokens_;
DISALLOW_COPY_AND_ASSIGN(DescriptorInfoMultipleMixin);
};
} // namespace bin
} // namespace dart
// The event handler delegation class is OS specific.
#if defined(DART_HOST_OS_ANDROID)
#include "bin/eventhandler_android.h"
#elif defined(DART_HOST_OS_FUCHSIA)
#include "bin/eventhandler_fuchsia.h"
#elif defined(DART_HOST_OS_LINUX)
#include "bin/eventhandler_linux.h"
#elif defined(DART_HOST_OS_MACOS)
#include "bin/eventhandler_macos.h"
#elif defined(DART_HOST_OS_WINDOWS)
#include "bin/eventhandler_win.h"
#else
#error Unknown target os.
#endif
namespace dart {
namespace bin {
class EventHandler {
public:
EventHandler() {}
void SendData(intptr_t id, Dart_Port dart_port, int64_t data) {
delegate_.SendData(id, dart_port, data);
}
/**
* Signal to main thread that event handler is done.
*/
void NotifyShutdownDone();
/**
* Start the event-handler.
*/
static void Start();
/**
* Stop the event-handler. It's expected that there will be no further calls
* to SendData after a call to Stop.
*/
static void Stop();
static EventHandlerImplementation* delegate();
static void SendFromNative(intptr_t id, Dart_Port port, int64_t data);
private:
friend class EventHandlerImplementation;
EventHandlerImplementation delegate_;
DISALLOW_COPY_AND_ASSIGN(EventHandler);
};
} // namespace bin
} // namespace dart
#endif // RUNTIME_BIN_EVENTHANDLER_H_