Revert "Introduce optional 'bool shared' parameter to ServerSocket.bind() ..."

dart/runtime/bin/eventhandler.h

 // 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 BIN_EVENTHANDLER_H_
 #define BIN_EVENTHANDLER_H_
 
 #include "bin/builtin.h"
-#include "bin/dartutils.h"
 #include "bin/isolate_data.h"
 
-#include "platform/hashmap.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_impl.dart. For more
 // information see the comments in socket_impl.dart
 enum MessageFlags {
   kInEvent = 0,
   kOutEvent = 1,
   kErrorEvent = 2,
   kCloseEvent = 3,
   kDestroyedEvent = 4,
   kCloseCommand = 8,
   kShutdownReadCommand = 9,
   kShutdownWriteCommand = 10,
   kReturnTokenCommand = 11,
   kListeningSocket = 16,
   kPipe = 17,
 };
 
-#define EVENT_MASK ((1 << kInEvent) | \
-                    (1 << kOutEvent) | \
-                    (1 << kErrorEvent) | \
-                    (1 << kCloseEvent) | \
-                    (1 << kDestroyedEvent))
 #define COMMAND_MASK ((1 << kCloseCommand) | \
                       (1 << kShutdownReadCommand) | \
                       (1 << kShutdownWriteCommand) | \
                       (1 << kReturnTokenCommand))
 #define IS_COMMAND(data, command_bit) \
     ((data & COMMAND_MASK) == (1 << command_bit))  // NOLINT
 #define ASSERT_NO_COMMAND(data) ASSERT((data & COMMAND_MASK) == 0)  // NOLINT
 #define TOKEN_COUNT(data) (data & ((1 << kCloseCommand) - 1))
 
 class TimeoutQueue {
@@ skipping 45 matching lines @@
     UpdateTimeout(CurrentPort(), -1);
   }
 
   void UpdateTimeout(Dart_Port port, int64_t timeout);
 
  private:
   Timeout* next_timeout_;
   Timeout* timeouts_;
 };
 
-
-template<typename T>
-class CircularLinkedList {
- public:
-  CircularLinkedList() : head_(NULL) {}
-
-  // 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() {
-    Entry* e = head_;
-    if (e->next_ == e) {
-      head_ = NULL;
-    } else {
-      e->prev_->next_ = e->next_;
-      e->next_->prev_ = e->prev_;
-      head_ = e->next_;
-    }
-    delete e;
-  }
-
-  void Remove(T item) {
-    if (head_ == NULL) {
-      return;
-    } else if (head_ == head_->next_) {
-      if (head_->t == item) {
-        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;
-          delete current;
-          return;
-        }
-      } while (current != head_);
-    }
-  }
-
-  T head() const { return head_->t; }
-
-  bool HasHead() const {
-    return head_ != NULL;
-  }
-
-  void Rotate() {
-    head_ = head_->next_;
-  }
-
- private:
-  struct Entry {
-    explicit Entry(const T& t) : t(t) {}
-    const T t;
-    Entry* next_;
-    Entry* prev_;
-  };
-
-  Entry* head_;
-};
-
-
-class DescriptorInfoBase {
- public:
-  explicit DescriptorInfoBase(intptr_t fd) : fd_(fd) {
-    ASSERT(fd_ != -1);
-  }
-
-  virtual ~DescriptorInfoBase() {}
-
-  intptr_t fd() { return fd_; }
-
-
-  // Type of socket.
-
-  virtual bool IsListeningSocket() const = 0;
-
-
-  // Ports.
-
-  virtual bool SetPortAndMask(Dart_Port port, intptr_t mask) = 0;
-
-  virtual bool RemovePort(Dart_Port port) = 0;
-
-  // Returns the next port which should be used for sending events to.
-  virtual Dart_Port NextPort() = 0;
-
-  virtual bool HasNextPort() = 0;
-
-  // Will post `data` to all known Dart_Ports.
-  virtual void SendToAll(uintptr_t data) = 0;
-
-
-  // Tokens.
-
-  // Returns true if the last token was taken.
-  virtual bool TakeToken() = 0;
-
-  // Returns true if the tokens was 0 before adding.
-  virtual bool ReturnTokens(Dart_Port port, int count) = 0;
-
-  // Returns true if for any registired Dart_port tokens are available.
-  virtual bool HasTokens() const = 0;
-
-
-  // Other.
-
-  virtual intptr_t Mask() = 0;
-
-  virtual void Close() = 0;
-
- protected:
-  intptr_t fd_;
-};
-
-
-// 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 SI>
-class DescriptorInfoSingleMixin : public SI {
- public:
-  explicit DescriptorInfoSingleMixin(intptr_t fd)
-      : SI(fd), port_(0), tokens_(16), mask_(0) {}
-
-  virtual ~DescriptorInfoSingleMixin() { }
-
-  virtual bool IsListeningSocket() const { return false; }
-
-  virtual bool SetPortAndMask(Dart_Port port, intptr_t mask) {
-    ASSERT(port_ == 0 || port == port_);
-    port_ = port;
-    mask_ = mask;
-    return true;
-  }
-
-  virtual bool RemovePort(Dart_Port port) {
-    // TODO(kustermann): 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;
-    return true;
-  }
-
-  virtual Dart_Port NextPort() {
-    ASSERT(port_ != 0);
-    return port_;
-  }
-
-  virtual bool HasNextPort() {
-    return port_ != 0;
-  }
-
-  virtual void SendToAll(uintptr_t data) {
-    if (port_ != 0) {
-      DartUtils::PostInt32(port_, data);
-    }
-  }
-
-  virtual bool TakeToken() {
-    ASSERT(tokens_ > 0);
-    tokens_--;
-    return tokens_ == 0;
-  }
-
-  virtual bool ReturnTokens(Dart_Port port, int count) {
-    ASSERT(port_ == port);
-    ASSERT(tokens_ >= 0);
-    bool was_empty = tokens_ == 0;
-    tokens_ += count;
-    return was_empty;
-  }
-
-  virtual bool HasTokens() const { return tokens_ > 0; }
-
-  virtual intptr_t Mask() {
-    return mask_;
-  }
-
-  virtual void Close() {
-    SI::Close();
-  }
-
- private:
-  Dart_Port port_;
-  int tokens_;
-  intptr_t mask_;
-};
-
-
-// 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 SI>
-class DescriptorInfoMultipleMixin : public SI {
- 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; }
-  };
-
- public:
-  explicit DescriptorInfoMultipleMixin(intptr_t fd)
-      : SI(fd), tokens_map_(&SamePortValue, 4) {}
-
-  virtual ~DescriptorInfoMultipleMixin() {}
-
-  virtual bool IsListeningSocket() const { return true; }
-
-  virtual bool SetPortAndMask(Dart_Port port, intptr_t mask) {
-    bool was_empty = !active_readers_.HasHead();
-    HashMap::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.
-    PortEntry* root = reinterpret_cast<PortEntry*>(active_readers_.head());
-
-    int ready_count = 0;
-    if (root != NULL) {
-      PortEntry* current = root;
-      do {
-        ASSERT(current->IsReady());
-        ready_count++;
-        active_readers_.Rotate();
-        current = active_readers_.head();
-      } while (current != root);
-    }
-    for (HashMap::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
-
-    return was_empty && active_readers_.HasHead();
-  }
-
-  virtual bool RemovePort(Dart_Port port) {
-    HashMap::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.
-    }
-    return !active_readers_.HasHead();
-  }
-
-  virtual Dart_Port NextPort() {
-    ASSERT(active_readers_.HasHead());
-    PortEntry* pentry = reinterpret_cast<PortEntry*>(active_readers_.head());
-    return pentry->dart_port;
-  }
-
-  virtual bool HasNextPort() {
-    return active_readers_.HasHead();
-  }
-
-  virtual void SendToAll(uintptr_t data) {
-    for (HashMap::Entry *entry = tokens_map_.Start();
-         entry != NULL;
-         entry = tokens_map_.Next(entry)) {
-      PortEntry* pentry = reinterpret_cast<PortEntry*>(entry->value);
-      DartUtils::PostInt32(pentry->dart_port, data);
-    }
-  }
-
-
-  virtual bool TakeToken() {
-    ASSERT(active_readers_.HasHead());
-    PortEntry* pentry = reinterpret_cast<PortEntry*>(active_readers_.head());
-    ASSERT(pentry->token_count > 0);
-    pentry->token_count--;
-    if (pentry->token_count == 0) {
-      active_readers_.RemoveHead();
-      return !active_readers_.HasHead();
-    } else {
-      active_readers_.Rotate();
-      return false;
-    }
-  }
-
-  virtual bool ReturnTokens(Dart_Port port, int count) {
-    HashMap::Entry* entry = tokens_map_.Lookup(
-        GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), false);
-    ASSERT(entry != NULL);
-
-    PortEntry* pentry = reinterpret_cast<PortEntry*>(entry->value);
-    pentry->token_count += count;
-    if (pentry->token_count == count && pentry->IsReady()) {
-      bool was_empty = !active_readers_.HasHead();
-      active_readers_.Add(pentry);
-      return was_empty;
-    }
-    return false;
-  }
-
-  virtual bool HasTokens() const {
-    return active_readers_.HasHead();
-  }
-
-  virtual intptr_t Mask() {
-    if (active_readers_.HasHead()) {
-      return 1 << kInEvent;
-    }
-    return 0;
-  }
-
-  virtual void Close() {
-    SI::Close();
-  }
-
- private:
-  // 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 }
-  HashMap tokens_map_;
-};
-
-
-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;
-
 }  // namespace bin
 }  // namespace dart
 
 // The event handler delegation class is OS specific.
 #if defined(TARGET_OS_ANDROID)
 #include "bin/eventhandler_android.h"
 #elif defined(TARGET_OS_LINUX)
 #include "bin/eventhandler_linux.h"
 #elif defined(TARGET_OS_MACOS)
 #include "bin/eventhandler_macos.h"
@@ skipping 27 matching lines @@
 
  private:
   friend class EventHandlerImplementation;
   EventHandlerImplementation delegate_;
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_EVENTHANDLER_H_