From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 .../base/threading/platform_thread_linux.cc        | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 security/sandbox/chromium/base/threading/platform_thread_linux.cc

(limited to 'security/sandbox/chromium/base/threading/platform_thread_linux.cc')

diff --git a/security/sandbox/chromium/base/threading/platform_thread_linux.cc b/security/sandbox/chromium/base/threading/platform_thread_linux.cc
new file mode 100644
index 000000000..4057ede94
--- /dev/null
+++ b/security/sandbox/chromium/base/threading/platform_thread_linux.cc
@@ -0,0 +1,120 @@
+// 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>
+
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/threading/platform_thread_internal_posix.h"
+#include "base/threading/thread_id_name_manager.h"
+#include "base/tracked_objects.h"
+#include "build/build_config.h"
+
+#if !defined(OS_NACL)
+#include <pthread.h>
+#include <sys/prctl.h>
+#include <sys/types.h>
+#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  &&
+         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};
+  if (pthread_getschedparam(pthread_self(), &maybe_sched_rr,
+                            &maybe_realtime_prio) == 0 &&
+      maybe_sched_rr == SCHED_RR &&
+      maybe_realtime_prio.sched_priority == kRealTimePrio.sched_priority) {
+    *priority = ThreadPriority::REALTIME_AUDIO;
+    return true;
+  }
+#endif
+  return false;
+}
+
+}  // namespace internal
+
+// static
+void PlatformThread::SetName(const std::string& name) {
+  ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
+  tracked_objects::ThreadData::InitializeThreadContext(name);
+
+#if !defined(OS_NACL)
+  // On linux we can get the thread names to show up in the debugger by setting
+  // the process name for the LWP.  We don't want to do this for the main
+  // thread because that would rename the process, causing tools like killall
+  // to stop working.
+  if (PlatformThread::CurrentId() == getpid())
+    return;
+
+  // http://0pointer.de/blog/projects/name-your-threads.html
+  // Set the name for the LWP (which gets truncated to 15 characters).
+  // Note that glibc also has a 'pthread_setname_np' api, but it may not be
+  // available everywhere and it's only benefit over using prctl directly is
+  // 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
-- 
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