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

dart/runtime/bin/eventhandler_linux.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_LINUX)
 
 #include "bin/eventhandler.h"
+#include "bin/eventhandler_linux.h"
 
 #include <errno.h>  // NOLINT
 #include <pthread.h>  // NOLINT
 #include <stdio.h>  // NOLINT
 #include <string.h>  // NOLINT
 #include <sys/epoll.h>  // NOLINT
 #include <sys/stat.h>  // NOLINT
 #include <sys/timerfd.h>  // NOLINT
 #include <unistd.h>  // NOLINT
 #include <fcntl.h>  // NOLINT
 
 #include "bin/dartutils.h"
 #include "bin/fdutils.h"
 #include "bin/log.h"
+#include "bin/lockers.h"
 #include "bin/socket.h"
 #include "bin/thread.h"
 #include "platform/utils.h"
 
 
 namespace dart {
 namespace bin {
 
-static const int kInterruptMessageSize = sizeof(InterruptMessage);
-static const int kTimerId = -1;
-static const int kShutdownId = -2;
 
-
-intptr_t SocketData::GetPollEvents() {
+intptr_t DescriptorInfo::GetPollEvents() {
   // Do not ask for EPOLLERR and EPOLLHUP explicitly as they are
   // triggered anyway.
   intptr_t events = 0;
-  if ((mask_ & (1 << kInEvent)) != 0) {
+  if ((Mask() & (1 << kInEvent)) != 0) {
     events |= EPOLLIN;
   }
-  if ((mask_ & (1 << kOutEvent)) != 0) {
+  if ((Mask() & (1 << kOutEvent)) != 0) {
     events |= EPOLLOUT;
   }
   return events;
 }
 
 
-// Unregister the file descriptor for a SocketData structure with epoll.
-static void RemoveFromEpollInstance(intptr_t epoll_fd_, SocketData* sd) {
+// Unregister the file descriptor for a DescriptorInfo structure with
+// epoll.
+static void RemoveFromEpollInstance(intptr_t epoll_fd_,
+                                    DescriptorInfo* di) {
   VOID_NO_RETRY_EXPECTED(epoll_ctl(epoll_fd_,
                                    EPOLL_CTL_DEL,
-                                   sd->fd(),
+                                   di->fd(),
                                    NULL));
 }
 
 
-static void AddToEpollInstance(intptr_t epoll_fd_, SocketData* sd) {
+static void AddToEpollInstance(intptr_t epoll_fd_, DescriptorInfo* di) {
   struct epoll_event event;
-  event.events = EPOLLRDHUP | sd->GetPollEvents();
-  if (!sd->IsListeningSocket()) {
+  event.events = EPOLLRDHUP | di->GetPollEvents();
+  if (!di->IsListeningSocket()) {
     event.events |= EPOLLET;
   }
-  event.data.ptr = sd;
+  event.data.ptr = di;
   int status = NO_RETRY_EXPECTED(epoll_ctl(epoll_fd_,
                                            EPOLL_CTL_ADD,
-                                           sd->fd(),
+                                           di->fd(),
                                            &event));
   if (status == -1) {
+    // TODO(kustermann): Verify that the dart end is handling this correctly &
+    // adapt this code to work for multiple listening sockets.
+
     // Epoll 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(sd->port(), 1 << kCloseEvent);
+    DartUtils::PostInt32(di->NextPort(), 1 << kCloseEvent);
   }
 }
 
 
 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 40 matching lines @@
 
 
 EventHandlerImplementation::~EventHandlerImplementation() {
   VOID_TEMP_FAILURE_RETRY(close(epoll_fd_));
   VOID_TEMP_FAILURE_RETRY(close(timer_fd_));
   VOID_TEMP_FAILURE_RETRY(close(interrupt_fds_[0]));
   VOID_TEMP_FAILURE_RETRY(close(interrupt_fds_[1]));
 }
 
 
-SocketData* EventHandlerImplementation::GetSocketData(intptr_t fd,
-                                                      bool is_listening) {
+DescriptorInfo* EventHandlerImplementation::GetDescriptorInfo(
+    intptr_t fd, bool is_listening) {
   ASSERT(fd >= 0);
   HashMap::Entry* entry = socket_map_.Lookup(
       GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd), true);
   ASSERT(entry != NULL);
-  SocketData* sd = reinterpret_cast<SocketData*>(entry->value);
-  if (sd == NULL) {
+  DescriptorInfo* di =
+      reinterpret_cast<DescriptorInfo*>(entry->value);
+  if (di == NULL) {
     // If there is no data in the hash map for this file descriptor a
-    // new SocketData for the file descriptor is inserted.
+    // new DescriptorInfo for the file descriptor is inserted.
     if (is_listening) {
-      sd = new ListeningSocketData(fd);
+      di = new DescriptorInfoMultiple(fd);
     } else {
-      sd = new SocketData(fd);
+      di = new DescriptorInfoSingle(fd);
     }
-    entry->value = sd;
+    entry->value = di;
   }
-  ASSERT(fd == sd->fd());
-  return sd;
+  ASSERT(fd == di->fd());
+  return di;
 }
 
 
 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 25 matching lines @@
       if (timeout_queue_.HasTimeout()) {
         int64_t millis = timeout_queue_.CurrentTimeout();
         it.it_value.tv_sec = millis / 1000;
         it.it_value.tv_nsec = (millis % 1000) * 1000000;
       }
       VOID_NO_RETRY_EXPECTED(
           timerfd_settime(timer_fd_, TFD_TIMER_ABSTIME, &it, NULL));
     } else if (msg[i].id == kShutdownId) {
       shutdown_ = true;
     } else {
-      SocketData* sd = GetSocketData(
+      DescriptorInfo* di = GetDescriptorInfo(
           msg[i].id, (msg[i].data & (1 << kListeningSocket)) != 0);
       if (IS_COMMAND(msg[i].data, kShutdownReadCommand)) {
-        ASSERT(!sd->IsListeningSocket());
+        ASSERT(!di->IsListeningSocket());
         // Close the socket for reading.
-        VOID_NO_RETRY_EXPECTED(shutdown(sd->fd(), SHUT_RD));
+        VOID_NO_RETRY_EXPECTED(shutdown(di->fd(), SHUT_RD));
       } else if (IS_COMMAND(msg[i].data, kShutdownWriteCommand)) {
-        ASSERT(!sd->IsListeningSocket());
+        ASSERT(!di->IsListeningSocket());
         // Close the socket for writing.
-        VOID_NO_RETRY_EXPECTED(shutdown(sd->fd(), SHUT_WR));
+        VOID_NO_RETRY_EXPECTED(shutdown(di->fd(), SHUT_WR));
       } else if (IS_COMMAND(msg[i].data, kCloseCommand)) {
         // Close the socket and free system resources and move on to next
         // message.
-        if (sd->RemovePort(msg[i].dart_port)) {
-          RemoveFromEpollInstance(epoll_fd_, sd);
-          intptr_t fd = sd->fd();
-          sd->Close();
-          socket_map_.Remove(GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
-          delete sd;
+        bool no_more_listeners = di->RemovePort(msg[i].dart_port);
+        if (no_more_listeners) {
+          RemoveFromEpollInstance(epoll_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;
         }
         DartUtils::PostInt32(msg[i].dart_port, 1 << kDestroyedEvent);
       } else if (IS_COMMAND(msg[i].data, kReturnTokenCommand)) {
         int count = TOKEN_COUNT(msg[i].data);
-        if (sd->ReturnToken(msg[i].dart_port, count)) {
-          AddToEpollInstance(epoll_fd_, sd);
+        if (di->ReturnTokens(msg[i].dart_port, count)) {
+          AddToEpollInstance(epoll_fd_, di);
         }
       } else {
         ASSERT_NO_COMMAND(msg[i].data);
-        // Setup events to wait for.
-        if (sd->AddPort(msg[i].dart_port)) {
-          sd->SetMask(msg[i].data);
-          AddToEpollInstance(epoll_fd_, sd);
+        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) {
+          AddToEpollInstance(epoll_fd_, di);
+        } else if (had_listeners && !has_listeners) {
+          RemoveFromEpollInstance(epoll_fd_, di);
         }
       }
     }
   }
 }
 
 #ifdef DEBUG_POLL
 static void PrintEventMask(intptr_t fd, intptr_t events) {
   Log::Print("%d ", fd);
   if ((events & EPOLLIN) != 0) Log::Print("EPOLLIN ");
   if ((events & EPOLLPRI) != 0) Log::Print("EPOLLPRI ");
   if ((events & EPOLLOUT) != 0) Log::Print("EPOLLOUT ");
   if ((events & EPOLLERR) != 0) Log::Print("EPOLLERR ");
   if ((events & EPOLLHUP) != 0) Log::Print("EPOLLHUP ");
   if ((events & EPOLLRDHUP) != 0) Log::Print("EPOLLRDHUP ");
   int all_events = EPOLLIN | EPOLLPRI | EPOLLOUT |
       EPOLLERR | EPOLLHUP | EPOLLRDHUP;
   if ((events & ~all_events) != 0) {
     Log::Print("(and %08x) ", events & ~all_events);
   }
   Log::Print("(available %d) ", FDUtils::AvailableBytes(fd));
 
   Log::Print("\n");
 }
 #endif
 
 intptr_t EventHandlerImplementation::GetPollEvents(intptr_t events,
-                                                   SocketData* sd) {
+                                                   DescriptorInfo* di) {
 #ifdef DEBUG_POLL
-  PrintEventMask(sd->fd(), events);
+  PrintEventMask(di->fd(), events);
 #endif
   if (events & EPOLLERR) {
     // Return error only if EPOLLIN is present.
     return (events & EPOLLIN) ? (1 << kErrorEvent) : 0;
   }
   intptr_t event_mask = 0;
   if (events & EPOLLIN) event_mask |= (1 << kInEvent);
   if (events & EPOLLOUT) event_mask |= (1 << kOutEvent);
   if (events & (EPOLLHUP | EPOLLRDHUP)) event_mask |= (1 << kCloseEvent);
   return event_mask;
 }
 
 
 void EventHandlerImplementation::HandleEvents(struct epoll_event* events,
                                               int size) {
   bool interrupt_seen = false;
   for (int i = 0; i < size; i++) {
     if (events[i].data.ptr == NULL) {
       interrupt_seen = true;
     } else if (events[i].data.fd == timer_fd_) {
       int64_t val;
       VOID_TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
           read(timer_fd_, &val, sizeof(val)));
       if (timeout_queue_.HasTimeout()) {
         DartUtils::PostNull(timeout_queue_.CurrentPort());
         timeout_queue_.RemoveCurrent();
       }
     } else {
-      SocketData* sd = reinterpret_cast<SocketData*>(events[i].data.ptr);
-      intptr_t event_mask = GetPollEvents(events[i].events, sd);
+      DescriptorInfo* di =
+          reinterpret_cast<DescriptorInfo*>(events[i].data.ptr);
+      intptr_t event_mask = GetPollEvents(events[i].events, di);
       if (event_mask != 0) {
-        Dart_Port port = sd->port();
-        if (sd->TakeToken()) {
+        Dart_Port port = di->NextPort();
+        ASSERT(port != 0);
+        if (di->TakeToken()) {
           // Took last token, remove from epoll.
-          RemoveFromEpollInstance(epoll_fd_, sd);
+          RemoveFromEpollInstance(epoll_fd_, di);
         }
-        ASSERT(port != 0);
         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 17 matching lines @@
     } else {
       handler_impl->HandleEvents(events, result);
     }
   }
   delete handler;
 }
 
 
 void EventHandlerImplementation::Start(EventHandler* handler) {
   int result = Thread::Start(&EventHandlerImplementation::Poll,
-                                   reinterpret_cast<uword>(handler));
+                             reinterpret_cast<uword>(handler));
   if (result != 0) {
     FATAL1("Failed to start event handler thread %d", result);
   }
 }
 
 
 void EventHandlerImplementation::Shutdown() {
   SendData(kShutdownId, 0, 0);
 }
 
@@ skipping 13 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_LINUX)