base: Set initial thread priority in ThreadFunc.

base/threading/platform_thread_linux.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 <sched.h>
 #include <stddef.h>
 
@@ skipping 11 matching lines @@
 #include <unistd.h>
 #endif
 
 namespace base {
 
 namespace internal {
 
 namespace {
 #if !defined(OS_NACL)
 const struct sched_param kRealTimePrio = {8};
-const struct sched_param kResetPrio = {0};
 #endif
 }  // namespace
 
 const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
     {ThreadPriority::BACKGROUND, 10},
     {ThreadPriority::NORMAL, 0},
     {ThreadPriority::DISPLAY, -6},
     {ThreadPriority::REALTIME_AUDIO, -10},
 };
 
 bool SetCurrentThreadPriorityForPlatform(ThreadPriority priority) {
 #if !defined(OS_NACL)
-  ThreadPriority current_priority;
-  if (priority != ThreadPriority::REALTIME_AUDIO &&
-      GetCurrentThreadPriorityForPlatform(&current_priority) &&
-      current_priority == ThreadPriority::REALTIME_AUDIO) {
-    // If the pthread's round-robin scheduler is already enabled, and the new
-    // priority will use setpriority() instead, the pthread scheduler should be
-    // reset to use SCHED_OTHER so that setpriority() just works.
-    pthread_setschedparam(pthread_self(), SCHED_OTHER, &kResetPrio);
-    return false;
-  }
-  return priority == ThreadPriority::REALTIME_AUDIO  &&
+  return priority == ThreadPriority::REALTIME_AUDIO &&
          pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0;
 #else
   return false;
 #endif
 }
 
 bool GetCurrentThreadPriorityForPlatform(ThreadPriority* priority) {
 #if !defined(OS_NACL)
   int maybe_sched_rr = 0;
   struct sched_param maybe_realtime_prio = {0};
@@ skipping 30 matching lines @@
   // that it can set the name of threads other than the current thread.
   int err = prctl(PR_SET_NAME, name.c_str());
   // We expect EPERM failures in sandboxed processes, just ignore those.
   if (err < 0 && errno != EPERM)
     DPLOG(ERROR) << "prctl(PR_SET_NAME)";
 #endif  //  !defined(OS_NACL)
 }
 
 void InitThreading() {}
 
-void InitOnThread() {}
-
 void TerminateOnThread() {}
 
 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
 #if !defined(THREAD_SANITIZER)
   return 0;
 #else
   // ThreadSanitizer bloats the stack heavily. Evidence has been that the
   // default stack size isn't enough for some browser tests.
   return 2 * (1 << 23);  // 2 times 8192K (the default stack size on Linux).
 #endif
 }
 
 }  // namespace base