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

dart/runtime/bin/eventhandler_macos.cc

 // 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include "bin/eventhandler.h"
-#include "bin/eventhandler_macos.h"
 
 #include <errno.h>  // NOLINT
 #include <pthread.h>  // NOLINT
 #include <stdio.h>  // NOLINT
 #include <string.h>  // NOLINT
 #include <sys/event.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 #include <fcntl.h>  // NOLINT
 
 #include "bin/dartutils.h"
 #include "bin/fdutils.h"
-#include "bin/lockers.h"
 #include "bin/log.h"
-#include "bin/socket.h"
 #include "bin/thread.h"
 #include "bin/utils.h"
 #include "platform/hashmap.h"
 #include "platform/utils.h"
 
 
 namespace dart {
 namespace bin {
 
+static const int kInterruptMessageSize = sizeof(InterruptMessage);
+static const int kInfinityTimeout = -1;
+static const int kTimerId = -1;
+static const int kShutdownId = -2;
 
-bool DescriptorInfo::HasReadEvent() {
-  return (Mask() & (1 << kInEvent)) != 0;
+
+bool SocketData::HasReadEvent() {
+  return (mask_ & (1 << kInEvent)) != 0;
 }
 
 
-bool DescriptorInfo::HasWriteEvent() {
-  return (Mask() & (1 << kOutEvent)) != 0;
+bool SocketData::HasWriteEvent() {
+  return (mask_ & (1 << kOutEvent)) != 0;
 }
 
 
 // Unregister the file descriptor for a SocketData structure with kqueue.
-static void RemoveFromKqueue(intptr_t kqueue_fd_, DescriptorInfo* di) {
-  if (!di->tracked_by_kqueue()) return;
+static void RemoveFromKqueue(intptr_t kqueue_fd_, SocketData* sd) {
+  if (!sd->tracked_by_kqueue()) return;
   static const intptr_t kMaxChanges = 2;
   struct kevent events[kMaxChanges];
-  EV_SET(events, di->fd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
+  EV_SET(events, sd->fd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
   VOID_NO_RETRY_EXPECTED(kevent(kqueue_fd_, events, 1, NULL, 0, NULL));
-  EV_SET(events, di->fd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
+  EV_SET(events, sd->fd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
   VOID_NO_RETRY_EXPECTED(kevent(kqueue_fd_, events, 1, NULL, 0, NULL));
-  di->set_tracked_by_kqueue(false);
+  sd->set_tracked_by_kqueue(false);
 }
 
 
 // Update the kqueue registration for SocketData structure to reflect
 // the events currently of interest.
-static void AddToKqueue(intptr_t kqueue_fd_, DescriptorInfo* di) {
-  ASSERT(!di->tracked_by_kqueue());
+static void AddToKqueue(intptr_t kqueue_fd_, SocketData* sd) {
+  ASSERT(!sd->tracked_by_kqueue());
   static const intptr_t kMaxChanges = 2;
   intptr_t changes = 0;
   struct kevent events[kMaxChanges];
   int flags = EV_ADD;
-  if (!di->IsListeningSocket()) {
+  if (!sd->IsListeningSocket()) {
     flags |= EV_CLEAR;
   }
   // Register or unregister READ filter if needed.
-  if (di->HasReadEvent()) {
+  if (sd->HasReadEvent()) {
     EV_SET(events + changes,
-           di->fd(),
+           sd->fd(),
            EVFILT_READ,
            flags,
            0,
            0,
-           di);
+           sd);
     ++changes;
   }
   // Register or unregister WRITE filter if needed.
-  if (di->HasWriteEvent()) {
+  if (sd->HasWriteEvent()) {
     EV_SET(events + changes,
-           di->fd(),
+           sd->fd(),
            EVFILT_WRITE,
            flags,
            0,
            0,
-           di);
+           sd);
     ++changes;
   }
   ASSERT(changes > 0);
   ASSERT(changes <= kMaxChanges);
   int status =
       NO_RETRY_EXPECTED(kevent(kqueue_fd_, events, changes, NULL, 0, NULL));
   if (status == -1) {
-    // TODO(kustermann): Verify that the dart end is handling this correctly &
-    // adapt this code to work for multiple listening sockets.
-
     // kQueue does not accept the file descriptor. It could be due to
     // already closed file descriptor, or unuspported devices, such
     // as /dev/null. In such case, mark the file descriptor as closed,
     // so dart will handle it accordingly.
-    DartUtils::PostInt32(di->NextPort(), 1 << kCloseEvent);
+    DartUtils::PostInt32(sd->port(), 1 << kCloseEvent);
   } else {
-    di->set_tracked_by_kqueue(true);
+    sd->set_tracked_by_kqueue(true);
   }
 }
 
 
 EventHandlerImplementation::EventHandlerImplementation()
     : socket_map_(&HashMap::SamePointerValue, 16) {
   intptr_t result;
   result = NO_RETRY_EXPECTED(pipe(interrupt_fds_));
   if (result != 0) {
     FATAL("Pipe creation failed");
@@ skipping 21 matching lines @@
 }
 
 
 EventHandlerImplementation::~EventHandlerImplementation() {
   VOID_TEMP_FAILURE_RETRY(close(kqueue_fd_));
   VOID_TEMP_FAILURE_RETRY(close(interrupt_fds_[0]));
   VOID_TEMP_FAILURE_RETRY(close(interrupt_fds_[1]));
 }
 
 
-DescriptorInfo* EventHandlerImplementation::GetDescriptorInfo(
-    intptr_t fd, bool is_listening) {
+SocketData* EventHandlerImplementation::GetSocketData(intptr_t fd) {
   ASSERT(fd >= 0);
   HashMap::Entry* entry = socket_map_.Lookup(
       GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd), true);
   ASSERT(entry != NULL);
-  DescriptorInfo* di =
-      reinterpret_cast<DescriptorInfo*>(entry->value);
-  if (di == NULL) {
+  SocketData* sd = reinterpret_cast<SocketData*>(entry->value);
+  if (sd == NULL) {
     // If there is no data in the hash map for this file descriptor a
-    // new DescriptorInfo for the file descriptor is inserted.
-    if (is_listening) {
-      di = new DescriptorInfoMultiple(fd);
-    } else {
-      di = new DescriptorInfoSingle(fd);
-    }
-    entry->value = di;
+    // new SocketData for the file descriptor is inserted.
+    sd = new SocketData(fd);
+    entry->value = sd;
   }
-  ASSERT(fd == di->fd());
-  return di;
+  ASSERT(fd == sd->fd());
+  return sd;
 }
 
 
 void EventHandlerImplementation::WakeupHandler(intptr_t id,
                                                Dart_Port dart_port,
                                                int64_t data) {
   InterruptMessage msg;
   msg.id = id;
   msg.dart_port = dart_port;
   msg.data = data;
@@ skipping 15 matching lines @@
   const intptr_t MAX_MESSAGES = kInterruptMessageSize;
   InterruptMessage msg[MAX_MESSAGES];
   ssize_t bytes = TEMP_FAILURE_RETRY(
       read(interrupt_fds_[0], msg, MAX_MESSAGES * kInterruptMessageSize));
   for (ssize_t i = 0; i < bytes / kInterruptMessageSize; i++) {
     if (msg[i].id == kTimerId) {
       timeout_queue_.UpdateTimeout(msg[i].dart_port, msg[i].data);
     } else if (msg[i].id == kShutdownId) {
       shutdown_ = true;
     } else {
-      DescriptorInfo* di = GetDescriptorInfo(
-          msg[i].id, (msg[i].data & (1 << kListeningSocket)) != 0);
+      SocketData* sd = GetSocketData(msg[i].id);
       if (IS_COMMAND(msg[i].data, kShutdownReadCommand)) {
-        ASSERT(!di->IsListeningSocket());
         // Close the socket for reading.
-        VOID_NO_RETRY_EXPECTED(shutdown(di->fd(), SHUT_RD));
+        shutdown(sd->fd(), SHUT_RD);
       } else if (IS_COMMAND(msg[i].data, kShutdownWriteCommand)) {
-        ASSERT(!di->IsListeningSocket());
         // Close the socket for writing.
-        VOID_NO_RETRY_EXPECTED(shutdown(di->fd(), SHUT_WR));
+        shutdown(sd->fd(), SHUT_WR);
       } else if (IS_COMMAND(msg[i].data, kCloseCommand)) {
-        // Close the socket and free system resources and move on to next
-        // message.
-        bool no_more_listeners = di->RemovePort(msg[i].dart_port);
-        if (no_more_listeners) {
-          RemoveFromKqueue(kqueue_fd_, di);
-        }
-
-        intptr_t fd = di->fd();
-        if (di->IsListeningSocket()) {
-          // We only close the socket file descriptor from the operating
-          // system if there are no other dart socket objects which
-          // are listening on the same (address, port) combination.
-          {
-            MutexLocker ml(globalTcpListeningSocketRegistry.mutex());
-            if (globalTcpListeningSocketRegistry.CloseSafe(fd)) {
-              socket_map_.Remove(
-                  GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
-              di->Close();
-              delete di;
-            }
-          }
-        } else {
-          ASSERT(no_more_listeners);
-          socket_map_.Remove(
-              GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
-          di->Close();
-          delete di;
-        }
+        // Close the socket and free system resources.
+        RemoveFromKqueue(kqueue_fd_, sd);
+        intptr_t fd = sd->fd();
+        VOID_TEMP_FAILURE_RETRY(close(fd));
+        socket_map_.Remove(GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
+        delete sd;
         DartUtils::PostInt32(msg[i].dart_port, 1 << kDestroyedEvent);
       } else if (IS_COMMAND(msg[i].data, kReturnTokenCommand)) {
         int count = TOKEN_COUNT(msg[i].data);
-        if (di->ReturnTokens(msg[i].dart_port, count)) {
-          AddToKqueue(kqueue_fd_, di);
+        for (int i = 0; i < count; i++) {
+          if (sd->ReturnToken()) {
+            AddToKqueue(kqueue_fd_, sd);
+          }
         }
       } else {
         ASSERT_NO_COMMAND(msg[i].data);
+        // Setup events to wait for.
         ASSERT((msg[i].data > 0) && (msg[i].data < kIntptrMax));
-        bool had_listeners = di->HasNextPort();
-        di->SetPortAndMask(msg[i].dart_port, msg[i].data & EVENT_MASK);
-        bool has_listeners = di->HasNextPort();
-
-        // Add/Remove from epoll set depending on previous and current state.
-        if (!had_listeners && has_listeners) {
-          AddToKqueue(kqueue_fd_, di);
-        } else if (had_listeners && !has_listeners) {
-          RemoveFromKqueue(kqueue_fd_, di);
-        }
+        ASSERT(sd->port() == 0);
+        sd->SetPortAndMask(msg[i].dart_port,
+                           static_cast<intptr_t>(msg[i].data));
+        AddToKqueue(kqueue_fd_, sd);
       }
     }
   }
 }
 
 #ifdef DEBUG_KQUEUE
 static void PrintEventMask(intptr_t fd, struct kevent* event) {
   Log::Print("%d ", static_cast<int>(fd));
   Log::Print("filter=0x%x:", event->filter);
   if (event->filter == EVFILT_READ) Log::Print("EVFILT_READ ");
   if (event->filter == EVFILT_WRITE) Log::Print("EVFILT_WRITE ");
   Log::Print("flags: %x: ", event->flags);
   if ((event->flags & EV_EOF) != 0) Log::Print("EV_EOF ");
   if ((event->flags & EV_ERROR) != 0) Log::Print("EV_ERROR ");
   if ((event->flags & EV_CLEAR) != 0) Log::Print("EV_CLEAR ");
   if ((event->flags & EV_ADD) != 0) Log::Print("EV_ADD ");
   if ((event->flags & EV_DELETE) != 0) Log::Print("EV_DELETE ");
   Log::Print("- fflags: %d ", event->fflags);
   Log::Print("- data: %ld ", event->data);
   Log::Print("(available %d) ",
       static_cast<int>(FDUtils::AvailableBytes(fd)));
   Log::Print("\n");
 }
 #endif
 
 
 intptr_t EventHandlerImplementation::GetEvents(struct kevent* event,
-                                               DescriptorInfo* di) {
+                                               SocketData* sd) {
 #ifdef DEBUG_KQUEUE
-  PrintEventMask(di->fd(), event);
+  PrintEventMask(sd->fd(), event);
 #endif
   intptr_t event_mask = 0;
-  if (di->IsListeningSocket()) {
+  if (sd->IsListeningSocket()) {
     // On a listening socket the READ event means that there are
     // connections ready to be accepted.
     if (event->filter == EVFILT_READ) {
       if ((event->flags & EV_EOF) != 0) {
         if (event->fflags != 0) {
           event_mask |= (1 << kErrorEvent);
         } else {
           event_mask |= (1 << kCloseEvent);
         }
       }
@@ skipping 35 matching lines @@
     // If flag EV_ERROR is set it indicates an error in kevent processing.
     if ((events[i].flags & EV_ERROR) != 0) {
       const int kBufferSize = 1024;
       char error_message[kBufferSize];
       strerror_r(events[i].data, error_message, kBufferSize);
       FATAL1("kevent failed %s\n", error_message);
     }
     if (events[i].udata == NULL) {
       interrupt_seen = true;
     } else {
-      DescriptorInfo* di =
-          reinterpret_cast<DescriptorInfo*>(events[i].udata);
-      intptr_t event_mask = GetEvents(events + i, di);
+      SocketData* sd = reinterpret_cast<SocketData*>(events[i].udata);
+      intptr_t event_mask = GetEvents(events + i, sd);
       if (event_mask != 0) {
-        Dart_Port port = di->NextPort();
+        if (sd->TakeToken()) {
+          // Took last token, remove from epoll.
+          RemoveFromKqueue(kqueue_fd_, sd);
+        }
+        Dart_Port port = sd->port();
         ASSERT(port != 0);
-        if (di->TakeToken()) {
-          // Took last token, remove from kqueue.
-          RemoveFromKqueue(kqueue_fd_, di);
-        }
         DartUtils::PostInt32(port, event_mask);
       }
     }
   }
   if (interrupt_seen) {
     // Handle after socket events, so we avoid closing a socket before we handle
     // the current events.
     HandleInterruptFd();
   }
 }
@@ skipping 90 matching lines @@
 
 uint32_t EventHandlerImplementation::GetHashmapHashFromFd(intptr_t fd) {
   // The hashmap does not support keys with value 0.
   return dart::Utils::WordHash(fd + 1);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)