Avoid duplication of OS::Thread methods for every POSIX platform.

src/platform-cygwin.cc

Index: src/platform-cygwin.cc
diff --git a/src/platform-cygwin.cc b/src/platform-cygwin.cc
index a9192775b76e9bdc69703e91cf898a3087dec549..c34330b3fb7210a169b1b17f703f86435c01d1a1 100644
--- a/src/platform-cygwin.cc
+++ b/src/platform-cygwin.cc
@@ -51,9 +51,6 @@
 namespace v8 {
 namespace internal {
 
-// 0 is never a valid thread id
-static const pthread_t kNoThread = (pthread_t) 0;
-
 
 double ceiling(double x) {
   return ceil(x);
@@ -418,110 +415,6 @@ bool VirtualMemory::HasLazyCommits() {
 }
 
 
-class Thread::PlatformData : public Malloced {
- public:
-  PlatformData() : thread_(kNoThread) {}
-  pthread_t thread_;  // Thread handle for pthread.
-};
-
-
-Thread::Thread(const Options& options)
-    : data_(new PlatformData()),
-      stack_size_(options.stack_size()),
-      start_semaphore_(NULL) {
-  set_name(options.name());
-}
-
-
-Thread::~Thread() {
-  delete data_;
-}
-
-
-static void* ThreadEntry(void* arg) {
-  Thread* thread = reinterpret_cast<Thread*>(arg);
-  // This is also initialized by the first argument to pthread_create() but we
-  // don't know which thread will run first (the original thread or the new
-  // one) so we initialize it here too.
-  thread->data()->thread_ = pthread_self();
-  ASSERT(thread->data()->thread_ != kNoThread);
-  thread->NotifyStartedAndRun();
-  return NULL;
-}
-
-
-void Thread::set_name(const char* name) {
-  strncpy(name_, name, sizeof(name_));
-  name_[sizeof(name_) - 1] = '\0';
-}
-
-
-void Thread::Start() {
-  pthread_attr_t* attr_ptr = NULL;
-  pthread_attr_t attr;
-  if (stack_size_ > 0) {
-    pthread_attr_init(&attr);
-    pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_));
-    attr_ptr = &attr;
-  }
-  pthread_create(&data_->thread_, attr_ptr, ThreadEntry, this);
-  ASSERT(data_->thread_ != kNoThread);
-}
-
-
-void Thread::Join() {
-  pthread_join(data_->thread_, NULL);
-}
-
-
-static inline Thread::LocalStorageKey PthreadKeyToLocalKey(
-    pthread_key_t pthread_key) {
-  // We need to cast pthread_key_t to Thread::LocalStorageKey in two steps
-  // because pthread_key_t is a pointer type on Cygwin. This will probably not
-  // work on 64-bit platforms, but Cygwin doesn't support 64-bit anyway.
-  STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t));
-  intptr_t ptr_key = reinterpret_cast<intptr_t>(pthread_key);
-  return static_cast<Thread::LocalStorageKey>(ptr_key);
-}
-
-
-static inline pthread_key_t LocalKeyToPthreadKey(
-    Thread::LocalStorageKey local_key) {
-  STATIC_ASSERT(sizeof(Thread::LocalStorageKey) == sizeof(pthread_key_t));
-  intptr_t ptr_key = static_cast<intptr_t>(local_key);
-  return reinterpret_cast<pthread_key_t>(ptr_key);
-}
-
-
-Thread::LocalStorageKey Thread::CreateThreadLocalKey() {
-  pthread_key_t key;
-  int result = pthread_key_create(&key, NULL);
-  USE(result);
-  ASSERT(result == 0);
-  return PthreadKeyToLocalKey(key);
-}
-
-
-void Thread::DeleteThreadLocalKey(LocalStorageKey key) {
-  pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
-  int result = pthread_key_delete(pthread_key);
-  USE(result);
-  ASSERT(result == 0);
-}
-
-
-void* Thread::GetThreadLocal(LocalStorageKey key) {
-  pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
-  return pthread_getspecific(pthread_key);
-}
-
-
-void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
-  pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
-  pthread_setspecific(pthread_key, value);
-}
-
-
 class CygwinSemaphore : public Semaphore {
  public:
   explicit CygwinSemaphore(int count) {  sem_init(&sem_, 0, count); }