base: Set initial thread priority in ThreadFunc.

base/threading/platform_thread_posix.cc

 // Copyright (c) 2012 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.
 
 #include "base/threading/platform_thread.h"
 
 #include <errno.h>
 #include <pthread.h>
 #include <sched.h>
 #include <stddef.h>
@@ skipping 38 matching lines @@
 
   PlatformThread::Delegate* delegate = nullptr;
 
   {
     scoped_ptr<ThreadParams> thread_params(static_cast<ThreadParams*>(params));
 
     delegate = thread_params->delegate;
     if (!thread_params->joinable)
       base::ThreadRestrictions::SetSingletonAllowed(false);
 
-    if (thread_params->priority != ThreadPriority::NORMAL)
-      PlatformThread::SetCurrentThreadPriority(thread_params->priority);
+    // Threads on linux/android may inherit their priority from the thread
+    // where they were created. This explicitly sets the priority of all new
+    // threads.
+    PlatformThread::SetCurrentThreadPriority(thread_params->priority);
   }
 
   ThreadIdNameManager::GetInstance()->RegisterThread(
       PlatformThread::CurrentHandle().platform_handle(),
       PlatformThread::CurrentId());
 
   delegate->ThreadMain();
 
   ThreadIdNameManager::GetInstance()->RemoveName(
       PlatformThread::CurrentHandle().platform_handle(),
@@ skipping 183 matching lines @@
     return ThreadPriority::NORMAL;
   }
 
   return internal::NiceValueToThreadPriority(nice_value);
 #endif  // !defined(OS_NACL)
 }
 
 #endif  // !defined(OS_MACOSX)
 
 }  // namespace base