Cleanup common POSIX functionality.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 007b1e7737077a82575169c9b3e96d4c3af5fc5e..e0d3de60b8fc6df4c69a9ea30e454740ee78cc30 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -893,56 +893,6 @@ void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
 }
 
 
-void Thread::YieldCPU() {
-  sched_yield();
-}
-
-
-class LinuxMutex : public Mutex {
- public:
-  LinuxMutex() {
-    pthread_mutexattr_t attrs;
-    int result = pthread_mutexattr_init(&attrs);
-    ASSERT(result == 0);
-    result = pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_RECURSIVE);
-    ASSERT(result == 0);
-    result = pthread_mutex_init(&mutex_, &attrs);
-    ASSERT(result == 0);
-    USE(result);
-  }
-
-  virtual ~LinuxMutex() { pthread_mutex_destroy(&mutex_); }
-
-  virtual int Lock() {
-    int result = pthread_mutex_lock(&mutex_);
-    return result;
-  }
-
-  virtual int Unlock() {
-    int result = pthread_mutex_unlock(&mutex_);
-    return result;
-  }
-
-  virtual bool TryLock() {
-    int result = pthread_mutex_trylock(&mutex_);
-    // Return false if the lock is busy and locking failed.
-    if (result == EBUSY) {
-      return false;
-    }
-    ASSERT(result == 0);  // Verify no other errors.
-    return true;
-  }
-
- private:
-  pthread_mutex_t mutex_;   // Pthread mutex for POSIX platforms.
-};
-
-
-Mutex* OS::CreateMutex() {
-  return new LinuxMutex();
-}
-
-
 class LinuxSemaphore : public Semaphore {
  public:
   explicit LinuxSemaphore(int count) {  sem_init(&sem_, 0, count); }