VM: Re-format to use at most one newline between functions

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.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "platform/globals.h"
 #if defined(HOST_OS_LINUX)
 
 #include "bin/eventhandler.h"
 #include "bin/eventhandler_linux.h"
 
 #include <errno.h>        // NOLINT
 #include <fcntl.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 "bin/dartutils.h"
 #include "bin/fdutils.h"
+#include "bin/lockers.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 {
 
 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) {
     events |= EPOLLIN;
   }
   if ((Mask() & (1 << kOutEvent)) != 0) {
     events |= EPOLLOUT;
   }
   return events;
 }
 
-
 // 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, di->fd(), NULL));
 }
 
-
 static void AddToEpollInstance(intptr_t epoll_fd_, DescriptorInfo* di) {
   struct epoll_event event;
   event.events = EPOLLRDHUP | di->GetPollEvents();
   if (!di->IsListeningSocket()) {
     event.events |= EPOLLET;
   }
   event.data.ptr = di;
   int status =
       NO_RETRY_EXPECTED(epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, di->fd(), &event));
   if (status == -1) {
     // TODO(dart:io): Verify that the dart end is handling this correctly.
 
     // 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.
     di->NotifyAllDartPorts(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");
   }
   if (!FDUtils::SetNonBlocking(interrupt_fds_[0])) {
     FATAL("Failed to set pipe fd non blocking\n");
   }
@@ skipping 31 matching lines @@
   event.events = EPOLLIN;
   event.data.fd = timer_fd_;
   status =
       NO_RETRY_EXPECTED(epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, timer_fd_, &event));
   if (status == -1) {
     FATAL2("Failed adding timerfd fd(%i) to epoll instance: %i", timer_fd_,
            errno);
   }
 }
 
-
 static void DeleteDescriptorInfo(void* info) {
   DescriptorInfo* di = reinterpret_cast<DescriptorInfo*>(info);
   di->Close();
   delete di;
 }
 
-
 EventHandlerImplementation::~EventHandlerImplementation() {
   socket_map_.Clear(DeleteDescriptorInfo);
   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]));
 }
 
-
 void EventHandlerImplementation::UpdateEpollInstance(intptr_t old_mask,
                                                      DescriptorInfo* di) {
   intptr_t new_mask = di->Mask();
   if ((old_mask != 0) && (new_mask == 0)) {
     RemoveFromEpollInstance(epoll_fd_, di);
   } else if ((old_mask == 0) && (new_mask != 0)) {
     AddToEpollInstance(epoll_fd_, di);
   } else if ((old_mask != 0) && (new_mask != 0) && (old_mask != new_mask)) {
     ASSERT(!di->IsListeningSocket());
     RemoveFromEpollInstance(epoll_fd_, di);
     AddToEpollInstance(epoll_fd_, di);
   }
 }
 
-
 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);
   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 DescriptorInfo for the file descriptor is inserted.
     if (is_listening) {
       di = new DescriptorInfoMultiple(fd);
     } else {
       di = new DescriptorInfoSingle(fd);
     }
     entry->value = di;
   }
   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;
   // WriteToBlocking will write up to 512 bytes atomically, and since our msg
   // is smaller than 512, we don't need a thread lock.
   // See: http://linux.die.net/man/7/pipe, section 'Pipe_buf'.
   ASSERT(kInterruptMessageSize < PIPE_BUF);
   intptr_t result =
       FDUtils::WriteToBlocking(interrupt_fds_[1], &msg, kInterruptMessageSize);
   if (result != kInterruptMessageSize) {
     if (result == -1) {
       perror("Interrupt message failure:");
     }
     FATAL1("Interrupt message failure. Wrote %" Pd " bytes.", result);
   }
 }
 
-
 void EventHandlerImplementation::HandleInterruptFd() {
   const intptr_t MAX_MESSAGES = kInterruptMessageSize;
   InterruptMessage msg[MAX_MESSAGES];
   ssize_t bytes = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
       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);
       struct itimerspec it;
       memset(&it, 0, sizeof(it));
@@ skipping 71 matching lines @@
         intptr_t old_mask = di->Mask();
         di->SetPortAndMask(msg[i].dart_port, msg[i].data & EVENT_MASK);
         UpdateEpollInstance(old_mask, di);
       } else {
         UNREACHABLE();
       }
     }
   }
 }
 
-
 #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) {
@@ skipping 12 matching lines @@
       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,
                                                    DescriptorInfo* di) {
 #ifdef DEBUG_POLL
   PrintEventMask(di->fd(), events);
 #endif
   if ((events & EPOLLERR) != 0) {
     // Return error only if EPOLLIN is present.
     return ((events & EPOLLIN) != 0) ? (1 << kErrorEvent) : 0;
   }
   intptr_t event_mask = 0;
   if ((events & EPOLLIN) != 0) {
     event_mask |= (1 << kInEvent);
   }
   if ((events & EPOLLOUT) != 0) {
     event_mask |= (1 << kOutEvent);
   }
   if ((events & (EPOLLHUP | EPOLLRDHUP)) != 0) {
     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)));
@@ skipping 17 matching lines @@
       }
     }
   }
   if (interrupt_seen) {
     // Handle after socket events, so we avoid closing a socket before we handle
     // the current events.
     HandleInterruptFd();
   }
 }
 
-
 void EventHandlerImplementation::Poll(uword args) {
   ThreadSignalBlocker signal_blocker(SIGPROF);
   static const intptr_t kMaxEvents = 16;
   struct epoll_event events[kMaxEvents];
   EventHandler* handler = reinterpret_cast<EventHandler*>(args);
   EventHandlerImplementation* handler_impl = &handler->delegate_;
   ASSERT(handler_impl != NULL);
 
   while (!handler_impl->shutdown_) {
     intptr_t result = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
         epoll_wait(handler_impl->epoll_fd_, events, kMaxEvents, -1));
     ASSERT(EAGAIN == EWOULDBLOCK);
     if (result <= 0) {
       if (errno != EWOULDBLOCK) {
         perror("Poll failed");
       }
     } else {
       handler_impl->HandleEvents(events, result);
     }
   }
   DEBUG_ASSERT(ReferenceCounted<Socket>::instances() == 0);
   handler->NotifyShutdownDone();
 }
 
-
 void EventHandlerImplementation::Start(EventHandler* handler) {
   int result = Thread::Start(&EventHandlerImplementation::Poll,
                              reinterpret_cast<uword>(handler));
   if (result != 0) {
     FATAL1("Failed to start event handler thread %d", result);
   }
 }
 
-
 void EventHandlerImplementation::Shutdown() {
   SendData(kShutdownId, 0, 0);
 }
 
-
 void EventHandlerImplementation::SendData(intptr_t id,
                                           Dart_Port dart_port,
                                           int64_t data) {
   WakeupHandler(id, dart_port, data);
 }
 
-
 void* EventHandlerImplementation::GetHashmapKeyFromFd(intptr_t fd) {
   // The hashmap does not support keys with value 0.
   return reinterpret_cast<void*>(fd + 1);
 }
 
-
 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(HOST_OS_LINUX)
 
 #endif  // !defined(DART_IO_DISABLED)