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The Tor Browser
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platform_thread_internal_posix.h (2760B)

      1 // Copyright 2015 The Chromium Authors
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
      6 #define BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
      7 
      8 #include "base/base_export.h"
      9 #include "base/threading/platform_thread.h"
     10 #include "build/build_config.h"
     11 #include "third_party/abseil-cpp/absl/types/optional.h"
     12 
     13 namespace base {
     14 
     15 namespace internal {
     16 
     17 struct ThreadTypeToNiceValuePair {
     18  ThreadType thread_type;
     19  int nice_value;
     20 };
     21 
     22 struct ThreadPriorityToNiceValuePairForTest {
     23  ThreadPriorityForTest priority;
     24  int nice_value;
     25 };
     26 
     27 // The elements must be listed in the order of increasing priority (lowest
     28 // priority first), that is, in the order of decreasing nice values (highest
     29 // nice value first).
     30 extern const ThreadTypeToNiceValuePair kThreadTypeToNiceValueMap[7];
     31 
     32 // The elements must be listed in the order of decreasing priority (highest
     33 // priority first), that is, in the order of increasing nice values (lowest nice
     34 // value first).
     35 extern const ThreadPriorityToNiceValuePairForTest
     36    kThreadPriorityToNiceValueMapForTest[7];
     37 
     38 // Returns the nice value matching |priority| based on the platform-specific
     39 // implementation of kThreadTypeToNiceValueMap.
     40 int ThreadTypeToNiceValue(ThreadType thread_type);
     41 
     42 // Returns whether SetCurrentThreadTypeForPlatform can set a thread as
     43 // kRealtimeAudio.
     44 bool CanSetThreadTypeToRealtimeAudio();
     45 
     46 // Allows platform specific tweaks to the generic POSIX solution for
     47 // SetCurrentThreadType(). Returns true if the platform-specific
     48 // implementation handled this |thread_type| change, false if the generic
     49 // implementation should instead proceed.
     50 bool SetCurrentThreadTypeForPlatform(ThreadType thread_type,
     51                                     MessagePumpType pump_type_hint);
     52 
     53 #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
     54 // Current thread id is cached in thread local storage for performance reasons.
     55 // In some rare cases it's important to invalidate that cache explicitly (e.g.
     56 // after going through clone() syscall which does not call pthread_atfork()
     57 // handlers).
     58 // This can only be called when the process is single-threaded.
     59 BASE_EXPORT void InvalidateTidCache();
     60 #endif  // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
     61 
     62 // Returns the ThreadPrioirtyForTest matching |nice_value| based on the
     63 // platform-specific implementation of kThreadPriorityToNiceValueMapForTest.
     64 ThreadPriorityForTest NiceValueToThreadPriorityForTest(int nice_value);
     65 
     66 absl::optional<ThreadPriorityForTest>
     67 GetCurrentThreadPriorityForPlatformForTest();
     68 
     69 int GetCurrentThreadNiceValue();
     70 
     71 }  // namespace internal
     72 
     73 }  // namespace base
     74 
     75 #endif  // BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_