Make LockImpl::Unlock available for inlining

base/synchronization/lock_impl.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_SYNCHRONIZATION_LOCK_IMPL_H_
 #define BASE_SYNCHRONIZATION_LOCK_IMPL_H_
 
 #include "base/base_export.h"
+#include "base/logging.h"
 #include "base/macros.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_POSIX)
+#include <errno.h>
 #include <pthread.h>
 #endif
 
 namespace base {
 namespace internal {
 
 // This class implements the underlying platform-specific spin-lock mechanism
 // used for the Lock class.  Most users should not use LockImpl directly, but
 // should instead use Lock.
 class BASE_EXPORT LockImpl {
  public:
 #if defined(OS_WIN)
   using NativeHandle = SRWLOCK;
 #elif defined(OS_POSIX)
-  using NativeHandle =  pthread_mutex_t;
+  using NativeHandle = pthread_mutex_t;
 #endif
 
   LockImpl();
   ~LockImpl();
 
   // If the lock is not held, take it and return true.  If the lock is already
   // held by something else, immediately return false.
   bool Try();
 
   // Take the lock, blocking until it is available if necessary.
   void Lock();
 
   // Release the lock.  This must only be called by the lock's holder: after
   // a successful call to Try, or a call to Lock.
-  void Unlock();
+  inline void Unlock();
 
   // Return the native underlying lock.
   // TODO(awalker): refactor lock and condition variables so that this is
   // unnecessary.
   NativeHandle* native_handle() { return &native_handle_; }
 
 #if defined(OS_POSIX)
   // Whether this lock will attempt to use priority inheritance.
   static bool PriorityInheritanceAvailable();
 #endif
 
  private:
   NativeHandle native_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(LockImpl);
 };
 
+#if defined(OS_WIN)
+void LockImpl::Unlock() {
+  ::ReleaseSRWLockExclusive(&native_handle_);
+}
+#elif defined(OS_POSIX)
+void LockImpl::Unlock() {
+  int rv = pthread_mutex_unlock(&native_handle_);
+  DCHECK_EQ(rv, 0) << ". " << strerror(rv);
+}
+#endif
+
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_SYNCHRONIZATION_LOCK_IMPL_H_