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

runtime/vm/os_thread_win.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"  // NOLINT
 #if defined(HOST_OS_WINDOWS)
 
 #include "vm/growable_array.h"
 #include "vm/lockers.h"
 #include "vm/os_thread.h"
@@ skipping 20 matching lines @@
   uword parameter() const { return parameter_; }
 
  private:
   const char* name_;
   OSThread::ThreadStartFunction function_;
   uword parameter_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadStartData);
 };
 
-
 // Dispatch to the thread start function provided by the caller. This trampoline
 // is used to ensure that the thread is properly destroyed if the thread just
 // exits.
 static unsigned int __stdcall ThreadEntry(void* data_ptr) {
   ThreadStartData* data = reinterpret_cast<ThreadStartData*>(data_ptr);
 
   const char* name = data->name();
   OSThread::ThreadStartFunction function = data->function();
   uword parameter = data->parameter();
   delete data;
 
   MonitorData::GetMonitorWaitDataForThread();
 
   // Create new OSThread object and set as TLS for new thread.
   OSThread* thread = OSThread::CreateOSThread();
   if (thread != NULL) {
     OSThread::SetCurrent(thread);
     thread->set_name(name);
 
     // Call the supplied thread start function handing it its parameters.
     function(parameter);
   }
 
   // Clean up the monitor wait data for this thread.
   MonitorWaitData::ThreadExit();
 
   return 0;
 }
 
-
 int OSThread::Start(const char* name,
                     ThreadStartFunction function,
                     uword parameter) {
   ThreadStartData* start_data = new ThreadStartData(name, function, parameter);
   uint32_t tid;
   uintptr_t thread = _beginthreadex(NULL, OSThread::GetMaxStackSize(),
                                     ThreadEntry, start_data, 0, &tid);
   if (thread == -1L || thread == 0) {
 #ifdef DEBUG
     fprintf(stderr, "_beginthreadex error: %d (%s)\n", errno, strerror(errno));
 #endif
     return errno;
   }
 
   // Close the handle, so we don't leak the thread object.
   CloseHandle(reinterpret_cast<HANDLE>(thread));
 
   return 0;
 }
 
-
 const ThreadId OSThread::kInvalidThreadId = 0;
 const ThreadJoinId OSThread::kInvalidThreadJoinId = NULL;
 
-
 ThreadLocalKey OSThread::CreateThreadLocal(ThreadDestructor destructor) {
   ThreadLocalKey key = TlsAlloc();
   if (key == kUnsetThreadLocalKey) {
     FATAL1("TlsAlloc failed %d", GetLastError());
   }
   ThreadLocalData::AddThreadLocal(key, destructor);
   return key;
 }
 
-
 void OSThread::DeleteThreadLocal(ThreadLocalKey key) {
   ASSERT(key != kUnsetThreadLocalKey);
   BOOL result = TlsFree(key);
   if (!result) {
     FATAL1("TlsFree failed %d", GetLastError());
   }
   ThreadLocalData::RemoveThreadLocal(key);
 }
 
-
 intptr_t OSThread::GetMaxStackSize() {
   const int kStackSize = (128 * kWordSize * KB);
   return kStackSize;
 }
 
-
 ThreadId OSThread::GetCurrentThreadId() {
   return ::GetCurrentThreadId();
 }
 
-
 #ifndef PRODUCT
 ThreadId OSThread::GetCurrentThreadTraceId() {
   return ::GetCurrentThreadId();
 }
 #endif  // PRODUCT
 
-
 ThreadJoinId OSThread::GetCurrentThreadJoinId(OSThread* thread) {
   ASSERT(thread != NULL);
   // Make sure we're filling in the join id for the current thread.
   ThreadId id = GetCurrentThreadId();
   ASSERT(thread->id() == id);
   // Make sure the join_id_ hasn't been set, yet.
   DEBUG_ASSERT(thread->join_id_ == kInvalidThreadJoinId);
   HANDLE handle = OpenThread(SYNCHRONIZE, false, id);
   ASSERT(handle != NULL);
 #if defined(DEBUG)
   thread->join_id_ = handle;
 #endif
   return handle;
 }
 
-
 void OSThread::Join(ThreadJoinId id) {
   HANDLE handle = static_cast<HANDLE>(id);
   ASSERT(handle != NULL);
   DWORD res = WaitForSingleObject(handle, INFINITE);
   CloseHandle(handle);
   ASSERT(res == WAIT_OBJECT_0);
 }
 
-
 intptr_t OSThread::ThreadIdToIntPtr(ThreadId id) {
   ASSERT(sizeof(id) <= sizeof(intptr_t));
   return static_cast<intptr_t>(id);
 }
 
-
 ThreadId OSThread::ThreadIdFromIntPtr(intptr_t id) {
   return static_cast<ThreadId>(id);
 }
 
-
 bool OSThread::Compare(ThreadId a, ThreadId b) {
   return a == b;
 }
 
-
 bool OSThread::GetCurrentStackBounds(uword* lower, uword* upper) {
 // On Windows stack limits for the current thread are available in
 // the thread information block (TIB). Its fields can be accessed through
 // FS segment register on x86 and GS segment register on x86_64.
 #ifdef _WIN64
   *upper = static_cast<uword>(__readgsqword(offsetof(NT_TIB64, StackBase)));
   *lower = static_cast<uword>(__readgsqword(offsetof(NT_TIB64, StackLimit)));
 #else
   *upper = static_cast<uword>(__readfsdword(offsetof(NT_TIB, StackBase)));
   *lower = static_cast<uword>(__readfsdword(offsetof(NT_TIB, StackLimit)));
 #endif
   return true;
 }
 
-
 void OSThread::SetThreadLocal(ThreadLocalKey key, uword value) {
   ASSERT(key != kUnsetThreadLocalKey);
   BOOL result = TlsSetValue(key, reinterpret_cast<void*>(value));
   if (!result) {
     FATAL1("TlsSetValue failed %d", GetLastError());
   }
 }
 
-
 Mutex::Mutex() {
   // Allocate unnamed semaphore with initial count 1 and max count 1.
   data_.semaphore_ = CreateSemaphore(NULL, 1, 1, NULL);
   if (data_.semaphore_ == NULL) {
     FATAL1("Mutex allocation failed %d", GetLastError());
   }
 #if defined(DEBUG)
   // When running with assertions enabled we do track the owner.
   owner_ = OSThread::kInvalidThreadId;
 #endif  // defined(DEBUG)
 }
 
-
 Mutex::~Mutex() {
   CloseHandle(data_.semaphore_);
 #if defined(DEBUG)
   // When running with assertions enabled we do track the owner.
   ASSERT(owner_ == OSThread::kInvalidThreadId);
 #endif  // defined(DEBUG)
 }
 
-
 void Mutex::Lock() {
   DWORD result = WaitForSingleObject(data_.semaphore_, INFINITE);
   if (result != WAIT_OBJECT_0) {
     FATAL1("Mutex lock failed %d", GetLastError());
   }
 #if defined(DEBUG)
   // When running with assertions enabled we do track the owner.
   owner_ = OSThread::GetCurrentThreadId();
 #endif  // defined(DEBUG)
 }
 
-
 bool Mutex::TryLock() {
   // Attempt to pass the semaphore but return immediately.
   DWORD result = WaitForSingleObject(data_.semaphore_, 0);
   if (result == WAIT_OBJECT_0) {
 #if defined(DEBUG)
     // When running with assertions enabled we do track the owner.
     owner_ = OSThread::GetCurrentThreadId();
 #endif  // defined(DEBUG)
     return true;
   }
   if (result == WAIT_ABANDONED || result == WAIT_FAILED) {
     FATAL1("Mutex try lock failed %d", GetLastError());
   }
   ASSERT(result == WAIT_TIMEOUT);
   return false;
 }
 
-
 void Mutex::Unlock() {
 #if defined(DEBUG)
   // When running with assertions enabled we do track the owner.
   ASSERT(IsOwnedByCurrentThread());
   owner_ = OSThread::kInvalidThreadId;
 #endif  // defined(DEBUG)
   BOOL result = ReleaseSemaphore(data_.semaphore_, 1, NULL);
   if (result == 0) {
     FATAL1("Mutex unlock failed %d", GetLastError());
   }
 }
 
-
 ThreadLocalKey MonitorWaitData::monitor_wait_data_key_ = kUnsetThreadLocalKey;
 
-
 Monitor::Monitor() {
   InitializeCriticalSection(&data_.cs_);
   InitializeCriticalSection(&data_.waiters_cs_);
   data_.waiters_head_ = NULL;
   data_.waiters_tail_ = NULL;
 
 #if defined(DEBUG)
   // When running with assertions enabled we track the owner.
   owner_ = OSThread::kInvalidThreadId;
 #endif  // defined(DEBUG)
 }
 
-
 Monitor::~Monitor() {
 #if defined(DEBUG)
   // When running with assertions enabled we track the owner.
   ASSERT(owner_ == OSThread::kInvalidThreadId);
 #endif  // defined(DEBUG)
 
   DeleteCriticalSection(&data_.cs_);
   DeleteCriticalSection(&data_.waiters_cs_);
 }
 
-
 bool Monitor::TryEnter() {
   // Attempt to pass the semaphore but return immediately.
   BOOL result = TryEnterCriticalSection(&data_.cs_);
   if (!result) {
     return false;
   }
 #if defined(DEBUG)
   // When running with assertions enabled we do track the owner.
   ASSERT(owner_ == OSThread::kInvalidThreadId);
   owner_ = OSThread::GetCurrentThreadId();
 #endif  // defined(DEBUG)
   return true;
 }
 
-
 void Monitor::Enter() {
   EnterCriticalSection(&data_.cs_);
 
 #if defined(DEBUG)
   // When running with assertions enabled we track the owner.
   ASSERT(owner_ == OSThread::kInvalidThreadId);
   owner_ = OSThread::GetCurrentThreadId();
 #endif  // defined(DEBUG)
 }
 
-
 void Monitor::Exit() {
 #if defined(DEBUG)
   // When running with assertions enabled we track the owner.
   ASSERT(IsOwnedByCurrentThread());
   owner_ = OSThread::kInvalidThreadId;
 #endif  // defined(DEBUG)
 
   LeaveCriticalSection(&data_.cs_);
 }
 
-
 void MonitorWaitData::ThreadExit() {
   if (MonitorWaitData::monitor_wait_data_key_ != kUnsetThreadLocalKey) {
     uword raw_wait_data =
         OSThread::GetThreadLocal(MonitorWaitData::monitor_wait_data_key_);
     // Clear in case this is called a second time.
     OSThread::SetThreadLocal(MonitorWaitData::monitor_wait_data_key_, 0);
     if (raw_wait_data != 0) {
       MonitorWaitData* wait_data =
           reinterpret_cast<MonitorWaitData*>(raw_wait_data);
       delete wait_data;
     }
   }
 }
 
-
 void MonitorData::AddWaiter(MonitorWaitData* wait_data) {
   // Add the MonitorWaitData object to the list of objects waiting for
   // this monitor.
   EnterCriticalSection(&waiters_cs_);
   if (waiters_tail_ == NULL) {
     ASSERT(waiters_head_ == NULL);
     waiters_head_ = waiters_tail_ = wait_data;
   } else {
     waiters_tail_->next_ = wait_data;
     waiters_tail_ = wait_data;
   }
   LeaveCriticalSection(&waiters_cs_);
 }
 
-
 void MonitorData::RemoveWaiter(MonitorWaitData* wait_data) {
   // Remove the MonitorWaitData object from the list of objects
   // waiting for this monitor.
   EnterCriticalSection(&waiters_cs_);
   MonitorWaitData* previous = NULL;
   MonitorWaitData* current = waiters_head_;
   while (current != NULL) {
     if (current == wait_data) {
       if (waiters_head_ == waiters_tail_) {
         waiters_head_ = waiters_tail_ = NULL;
@@ skipping 10 matching lines @@
       // Clear next.
       wait_data->next_ = NULL;
       break;
     }
     previous = current;
     current = current->next_;
   }
   LeaveCriticalSection(&waiters_cs_);
 }
 
-
 void MonitorData::SignalAndRemoveFirstWaiter() {
   EnterCriticalSection(&waiters_cs_);
   MonitorWaitData* first = waiters_head_;
   if (first != NULL) {
     // Remove from list.
     if (waiters_head_ == waiters_tail_) {
       waiters_tail_ = waiters_head_ = NULL;
     } else {
       waiters_head_ = waiters_head_->next_;
     }
     // Clear next.
     first->next_ = NULL;
     // Signal event.
     BOOL result = SetEvent(first->event_);
     if (result == 0) {
       FATAL1("Monitor::Notify failed to signal event %d", GetLastError());
     }
   }
   LeaveCriticalSection(&waiters_cs_);
 }
 
-
 void MonitorData::SignalAndRemoveAllWaiters() {
   EnterCriticalSection(&waiters_cs_);
   // Extract list to signal.
   MonitorWaitData* current = waiters_head_;
   // Clear list.
   waiters_head_ = waiters_tail_ = NULL;
   // Iterate and signal all events.
   while (current != NULL) {
     // Copy next.
     MonitorWaitData* next = current->next_;
     // Clear next.
     current->next_ = NULL;
     // Signal event.
     BOOL result = SetEvent(current->event_);
     if (result == 0) {
       FATAL1("Failed to set event for NotifyAll %d", GetLastError());
     }
     current = next;
   }
   LeaveCriticalSection(&waiters_cs_);
 }
 
-
 MonitorWaitData* MonitorData::GetMonitorWaitDataForThread() {
   // Ensure that the thread local key for monitor wait data objects is
   // initialized.
   ASSERT(MonitorWaitData::monitor_wait_data_key_ != kUnsetThreadLocalKey);
 
   // Get the MonitorWaitData object containing the event for this
   // thread from thread local storage. Create it if it does not exist.
   uword raw_wait_data =
       OSThread::GetThreadLocal(MonitorWaitData::monitor_wait_data_key_);
   MonitorWaitData* wait_data = NULL;
   if (raw_wait_data == 0) {
     HANDLE event = CreateEvent(NULL, FALSE, FALSE, NULL);
     wait_data = new MonitorWaitData(event);
     OSThread::SetThreadLocal(MonitorWaitData::monitor_wait_data_key_,
                              reinterpret_cast<uword>(wait_data));
   } else {
     wait_data = reinterpret_cast<MonitorWaitData*>(raw_wait_data);
     wait_data->next_ = NULL;
   }
   return wait_data;
 }
 
-
 Monitor::WaitResult Monitor::Wait(int64_t millis) {
 #if defined(DEBUG)
   // When running with assertions enabled we track the owner.
   ASSERT(IsOwnedByCurrentThread());
   ThreadId saved_owner = owner_;
   owner_ = OSThread::kInvalidThreadId;
 #endif  // defined(DEBUG)
 
   Monitor::WaitResult retval = kNotified;
 
@@ skipping 34 matching lines @@
 
 #if defined(DEBUG)
   // When running with assertions enabled we track the owner.
   ASSERT(owner_ == OSThread::kInvalidThreadId);
   owner_ = OSThread::GetCurrentThreadId();
   ASSERT(owner_ == saved_owner);
 #endif  // defined(DEBUG)
   return retval;
 }
 
-
 Monitor::WaitResult Monitor::WaitMicros(int64_t micros) {
   // TODO(johnmccutchan): Investigate sub-millisecond sleep times on Windows.
   int64_t millis = micros / kMicrosecondsPerMillisecond;
   if ((millis * kMicrosecondsPerMillisecond) < micros) {
     // We've been asked to sleep for a fraction of a millisecond,
     // this isn't supported on Windows. Bumps milliseconds up by one
     // so that we never return too early. We likely return late though.
     millis += 1;
   }
   return Wait(millis);
 }
 
-
 void Monitor::Notify() {
   // When running with assertions enabled we track the owner.
   ASSERT(IsOwnedByCurrentThread());
   data_.SignalAndRemoveFirstWaiter();
 }
 
-
 void Monitor::NotifyAll() {
   // When running with assertions enabled we track the owner.
   ASSERT(IsOwnedByCurrentThread());
   // If one of the objects in the list of waiters wakes because of a
   // timeout before we signal it, that object will get an extra
   // signal. This will be treated as a spurious wake-up and is OK
   // since all uses of monitors should recheck the condition after a
   // Wait.
   data_.SignalAndRemoveAllWaiters();
 }
 
-
 void ThreadLocalData::AddThreadLocal(ThreadLocalKey key,
                                      ThreadDestructor destructor) {
   ASSERT(thread_locals_ != NULL);
   if (destructor == NULL) {
     // We only care about thread locals with destructors.
     return;
   }
   MutexLocker ml(mutex_, false);
 #if defined(DEBUG)
   // Verify that we aren't added twice.
   for (intptr_t i = 0; i < thread_locals_->length(); i++) {
     const ThreadLocalEntry& entry = thread_locals_->At(i);
     ASSERT(entry.key() != key);
   }
 #endif
   // Add to list.
   thread_locals_->Add(ThreadLocalEntry(key, destructor));
 }
 
-
 void ThreadLocalData::RemoveThreadLocal(ThreadLocalKey key) {
   ASSERT(thread_locals_ != NULL);
   MutexLocker ml(mutex_, false);
   intptr_t i = 0;
   for (; i < thread_locals_->length(); i++) {
     const ThreadLocalEntry& entry = thread_locals_->At(i);
     if (entry.key() == key) {
       break;
     }
   }
   if (i == thread_locals_->length()) {
     // Not found.
     return;
   }
   thread_locals_->RemoveAt(i);
 }
 
-
 // This function is executed on the thread that is exiting. It is invoked
 // by |OnDartThreadExit| (see below for notes on TLS destructors on Windows).
 void ThreadLocalData::RunDestructors() {
   ASSERT(thread_locals_ != NULL);
   ASSERT(mutex_ != NULL);
   MutexLocker ml(mutex_, false);
   for (intptr_t i = 0; i < thread_locals_->length(); i++) {
     const ThreadLocalEntry& entry = thread_locals_->At(i);
     // We access the exiting thread's TLS variable here.
     void* p = reinterpret_cast<void*>(OSThread::GetThreadLocal(entry.key()));
     // We invoke the constructor here.
     entry.destructor()(p);
   }
 }
 
-
 Mutex* ThreadLocalData::mutex_ = NULL;
 MallocGrowableArray<ThreadLocalEntry>* ThreadLocalData::thread_locals_ = NULL;
 
-
 void ThreadLocalData::InitOnce() {
   mutex_ = new Mutex();
   thread_locals_ = new MallocGrowableArray<ThreadLocalEntry>();
 }
 
-
 void ThreadLocalData::Shutdown() {
   if (mutex_ != NULL) {
     delete mutex_;
     mutex_ = NULL;
   }
   if (thread_locals_ != NULL) {
     delete thread_locals_;
     thread_locals_ = NULL;
   }
 }
 
-
 }  // namespace dart
 
 // The following was adapted from Chromium:
 // src/base/threading/thread_local_storage_win.cc
 
 // Thread Termination Callbacks.
 // Windows doesn't support a per-thread destructor with its
 // TLS primitives.  So, we build it manually by inserting a
 // function to be called on each thread's exit.
 // This magic is from http://www.codeproject.com/threads/tls.asp
@@ skipping 63 matching lines @@
 #pragma data_seg(".CRT$XLB")
 PIMAGE_TLS_CALLBACK p_thread_callback_dart = OnDartThreadExit;
 
 // Reset the default section.
 #pragma data_seg()
 
 #endif  // _WIN64
 }  // extern "C"
 
 #endif  // defined(HOST_OS_WINDOWS)