575 lines
21 KiB
C++
575 lines
21 KiB
C++
// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/threading/platform_thread_win.h"
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#include <stddef.h>
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#include <string>
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#include "base/allocator/partition_allocator/partition_alloc_buildflags.h"
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#include "base/debug/alias.h"
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#include "base/debug/crash_logging.h"
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#include "base/debug/profiler.h"
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#include "base/feature_list.h"
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#include "base/logging.h"
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#include "base/memory/raw_ptr.h"
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#include "base/metrics/histogram_macros.h"
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#include "base/process/memory.h"
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#include "base/strings/string_number_conversions.h"
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#include "base/strings/utf_string_conversions.h"
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#include "base/threading/scoped_blocking_call.h"
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#include "base/threading/scoped_thread_priority.h"
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#include "base/threading/thread_id_name_manager.h"
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#include "base/threading/thread_restrictions.h"
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#include "base/threading/threading_features.h"
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#include "base/time/time_override.h"
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#include "base/win/scoped_handle.h"
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#include "base/win/windows_version.h"
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#include "build/build_config.h"
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#include <windows.h>
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#if BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC) && BUILDFLAG(USE_STARSCAN)
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#include "base/allocator/partition_allocator/starscan/pcscan.h"
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#include "base/allocator/partition_allocator/starscan/stack/stack.h"
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#endif
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namespace base {
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BASE_FEATURE(kUseThreadPriorityLowest,
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"UseThreadPriorityLowest",
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base::FEATURE_DISABLED_BY_DEFAULT);
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BASE_FEATURE(kAboveNormalCompositingBrowserWin,
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"AboveNormalCompositingBrowserWin",
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base::FEATURE_DISABLED_BY_DEFAULT);
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namespace {
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// Flag used to set thread priority to |THREAD_PRIORITY_LOWEST| for
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// |kUseThreadPriorityLowest| Feature.
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std::atomic<bool> g_use_thread_priority_lowest{false};
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// Flag used to map Compositing ThreadType |THREAD_PRIORITY_ABOVE_NORMAL| on the
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// UI thread for |kAboveNormalCompositingBrowserWin| Feature.
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std::atomic<bool> g_above_normal_compositing_browser{false};
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// These values are sometimes returned by ::GetThreadPriority().
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constexpr int kWinDisplayPriority1 = 5;
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constexpr int kWinDisplayPriority2 = 6;
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// The information on how to set the thread name comes from
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// a MSDN article: http://msdn2.microsoft.com/en-us/library/xcb2z8hs.aspx
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const DWORD kVCThreadNameException = 0x406D1388;
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typedef struct tagTHREADNAME_INFO {
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DWORD dwType; // Must be 0x1000.
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LPCSTR szName; // Pointer to name (in user addr space).
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DWORD dwThreadID; // Thread ID (-1=caller thread).
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DWORD dwFlags; // Reserved for future use, must be zero.
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} THREADNAME_INFO;
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// The SetThreadDescription API was brought in version 1607 of Windows 10.
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typedef HRESULT(WINAPI* SetThreadDescription)(HANDLE hThread,
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PCWSTR lpThreadDescription);
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// This function has try handling, so it is separated out of its caller.
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void SetNameInternal(PlatformThreadId thread_id, const char* name) {
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THREADNAME_INFO info;
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info.dwType = 0x1000;
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info.szName = name;
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info.dwThreadID = thread_id;
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info.dwFlags = 0;
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__try {
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RaiseException(kVCThreadNameException, 0, sizeof(info) / sizeof(ULONG_PTR),
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reinterpret_cast<ULONG_PTR*>(&info));
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} __except (EXCEPTION_EXECUTE_HANDLER) {
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}
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}
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struct ThreadParams {
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raw_ptr<PlatformThread::Delegate> delegate;
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bool joinable;
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ThreadType thread_type;
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MessagePumpType message_pump_type;
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};
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DWORD __stdcall ThreadFunc(void* params) {
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ThreadParams* thread_params = static_cast<ThreadParams*>(params);
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PlatformThread::Delegate* delegate = thread_params->delegate;
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if (!thread_params->joinable)
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base::DisallowSingleton();
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if (thread_params->thread_type != ThreadType::kDefault)
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internal::SetCurrentThreadType(thread_params->thread_type,
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thread_params->message_pump_type);
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// Retrieve a copy of the thread handle to use as the key in the
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// thread name mapping.
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PlatformThreadHandle::Handle platform_handle;
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BOOL did_dup = DuplicateHandle(GetCurrentProcess(),
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GetCurrentThread(),
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GetCurrentProcess(),
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&platform_handle,
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0,
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FALSE,
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DUPLICATE_SAME_ACCESS);
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#if BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC) && BUILDFLAG(USE_STARSCAN)
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partition_alloc::internal::PCScan::NotifyThreadCreated(
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partition_alloc::internal::GetStackPointer());
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#endif
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win::ScopedHandle scoped_platform_handle;
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if (did_dup) {
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scoped_platform_handle.Set(platform_handle);
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ThreadIdNameManager::GetInstance()->RegisterThread(
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scoped_platform_handle.get(), PlatformThread::CurrentId());
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}
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delete thread_params;
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delegate->ThreadMain();
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if (did_dup) {
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ThreadIdNameManager::GetInstance()->RemoveName(scoped_platform_handle.get(),
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PlatformThread::CurrentId());
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}
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#if BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC) && BUILDFLAG(USE_STARSCAN)
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partition_alloc::internal::PCScan::NotifyThreadDestroyed();
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#endif
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// Ensure thread priority is at least NORMAL before initiating thread
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// destruction. Thread destruction on Windows holds the LdrLock while
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// performing TLS destruction which causes hangs if performed at background
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// priority (priority inversion) (see: http://crbug.com/1096203).
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if (::GetThreadPriority(::GetCurrentThread()) < THREAD_PRIORITY_NORMAL)
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PlatformThread::SetCurrentThreadType(ThreadType::kDefault);
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return 0;
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}
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// CreateThreadInternal() matches PlatformThread::CreateWithType(), except
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// that |out_thread_handle| may be nullptr, in which case a non-joinable thread
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// is created.
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bool CreateThreadInternal(size_t stack_size,
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PlatformThread::Delegate* delegate,
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PlatformThreadHandle* out_thread_handle,
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ThreadType thread_type,
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MessagePumpType message_pump_type) {
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unsigned int flags = 0;
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if (stack_size > 0) {
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flags = STACK_SIZE_PARAM_IS_A_RESERVATION;
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#if defined(ARCH_CPU_32_BITS)
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} else {
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// The process stack size is increased to give spaces to |RendererMain| in
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// |chrome/BUILD.gn|, but keep the default stack size of other threads to
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// 1MB for the address space pressure.
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flags = STACK_SIZE_PARAM_IS_A_RESERVATION;
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static BOOL is_wow64 = -1;
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if (is_wow64 == -1 && !IsWow64Process(GetCurrentProcess(), &is_wow64))
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is_wow64 = FALSE;
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// When is_wow64 is set that means we are running on 64-bit Windows and we
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// get 4 GiB of address space. In that situation we can afford to use 1 MiB
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// of address space for stacks. When running on 32-bit Windows we only get
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// 2 GiB of address space so we need to conserve. Typically stack usage on
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// these threads is only about 100 KiB.
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if (is_wow64)
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stack_size = 1024 * 1024;
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else
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stack_size = 512 * 1024;
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#endif
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}
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ThreadParams* params = new ThreadParams;
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params->delegate = delegate;
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params->joinable = out_thread_handle != nullptr;
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params->thread_type = thread_type;
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params->message_pump_type = message_pump_type;
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// Using CreateThread here vs _beginthreadex makes thread creation a bit
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// faster and doesn't require the loader lock to be available. Our code will
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// have to work running on CreateThread() threads anyway, since we run code on
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// the Windows thread pool, etc. For some background on the difference:
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// http://www.microsoft.com/msj/1099/win32/win321099.aspx
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void* thread_handle =
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::CreateThread(nullptr, stack_size, ThreadFunc, params, flags, nullptr);
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if (!thread_handle) {
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DWORD last_error = ::GetLastError();
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switch (last_error) {
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case ERROR_NOT_ENOUGH_MEMORY:
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case ERROR_OUTOFMEMORY:
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case ERROR_COMMITMENT_LIMIT:
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TerminateBecauseOutOfMemory(stack_size);
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break;
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default:
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static auto* last_error_crash_key = debug::AllocateCrashKeyString(
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"create_thread_last_error", debug::CrashKeySize::Size32);
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debug::SetCrashKeyString(last_error_crash_key,
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base::NumberToString(last_error));
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break;
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}
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delete params;
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return false;
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}
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if (out_thread_handle)
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*out_thread_handle = PlatformThreadHandle(thread_handle);
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else
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CloseHandle(thread_handle);
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return true;
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}
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} // namespace
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namespace internal {
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void AssertMemoryPriority(HANDLE thread, int memory_priority) {
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#if DCHECK_IS_ON()
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static const auto get_thread_information_fn =
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reinterpret_cast<decltype(&::GetThreadInformation)>(::GetProcAddress(
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::GetModuleHandle(L"Kernel32.dll"), "GetThreadInformation"));
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DCHECK(get_thread_information_fn);
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MEMORY_PRIORITY_INFORMATION memory_priority_information = {};
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DCHECK(get_thread_information_fn(thread, ::ThreadMemoryPriority,
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&memory_priority_information,
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sizeof(memory_priority_information)));
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DCHECK_EQ(memory_priority,
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static_cast<int>(memory_priority_information.MemoryPriority));
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#endif
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}
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} // namespace internal
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// static
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PlatformThreadId PlatformThread::CurrentId() {
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return ::GetCurrentThreadId();
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}
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// static
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PlatformThreadRef PlatformThread::CurrentRef() {
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return PlatformThreadRef(::GetCurrentThreadId());
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}
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// static
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PlatformThreadHandle PlatformThread::CurrentHandle() {
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return PlatformThreadHandle(::GetCurrentThread());
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}
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// static
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void PlatformThread::YieldCurrentThread() {
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::Sleep(0);
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}
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// static
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void PlatformThread::Sleep(TimeDelta duration) {
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// When measured with a high resolution clock, Sleep() sometimes returns much
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// too early. We may need to call it repeatedly to get the desired duration.
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// PlatformThread::Sleep doesn't support mock-time, so this always uses
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// real-time.
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const TimeTicks end = subtle::TimeTicksNowIgnoringOverride() + duration;
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for (TimeTicks now = subtle::TimeTicksNowIgnoringOverride(); now < end;
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now = subtle::TimeTicksNowIgnoringOverride()) {
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::Sleep(static_cast<DWORD>((end - now).InMillisecondsRoundedUp()));
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}
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}
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// static
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void PlatformThread::SetName(const std::string& name) {
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ThreadIdNameManager::GetInstance()->SetName(name);
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// The SetThreadDescription API works even if no debugger is attached.
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static auto set_thread_description_func =
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reinterpret_cast<SetThreadDescription>(::GetProcAddress(
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::GetModuleHandle(L"Kernel32.dll"), "SetThreadDescription"));
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if (set_thread_description_func) {
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set_thread_description_func(::GetCurrentThread(),
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base::UTF8ToWide(name).c_str());
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}
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// The debugger needs to be around to catch the name in the exception. If
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// there isn't a debugger, we are just needlessly throwing an exception.
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if (!::IsDebuggerPresent())
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return;
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SetNameInternal(CurrentId(), name.c_str());
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}
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// static
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const char* PlatformThread::GetName() {
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return ThreadIdNameManager::GetInstance()->GetName(CurrentId());
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}
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// static
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bool PlatformThread::CreateWithType(size_t stack_size,
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Delegate* delegate,
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PlatformThreadHandle* thread_handle,
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ThreadType thread_type,
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MessagePumpType pump_type_hint) {
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DCHECK(thread_handle);
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return CreateThreadInternal(stack_size, delegate, thread_handle, thread_type,
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pump_type_hint);
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}
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// static
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bool PlatformThread::CreateNonJoinable(size_t stack_size, Delegate* delegate) {
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return CreateNonJoinableWithType(stack_size, delegate, ThreadType::kDefault);
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}
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// static
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bool PlatformThread::CreateNonJoinableWithType(size_t stack_size,
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Delegate* delegate,
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ThreadType thread_type,
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MessagePumpType pump_type_hint) {
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return CreateThreadInternal(stack_size, delegate, nullptr /* non-joinable */,
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thread_type, pump_type_hint);
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}
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// static
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void PlatformThread::Join(PlatformThreadHandle thread_handle) {
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DCHECK(thread_handle.platform_handle());
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DWORD thread_id = 0;
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thread_id = ::GetThreadId(thread_handle.platform_handle());
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DWORD last_error = 0;
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if (!thread_id)
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last_error = ::GetLastError();
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// Record information about the exiting thread in case joining hangs.
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base::debug::Alias(&thread_id);
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base::debug::Alias(&last_error);
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base::internal::ScopedBlockingCallWithBaseSyncPrimitives scoped_blocking_call(
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FROM_HERE, base::BlockingType::MAY_BLOCK);
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// Wait for the thread to exit. It should already have terminated but make
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// sure this assumption is valid.
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CHECK_EQ(WAIT_OBJECT_0,
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WaitForSingleObject(thread_handle.platform_handle(), INFINITE));
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CloseHandle(thread_handle.platform_handle());
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}
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// static
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void PlatformThread::Detach(PlatformThreadHandle thread_handle) {
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CloseHandle(thread_handle.platform_handle());
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}
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// static
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bool PlatformThread::CanChangeThreadType(ThreadType from, ThreadType to) {
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return true;
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}
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namespace {
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void SetCurrentThreadPriority(ThreadType thread_type,
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MessagePumpType pump_type_hint) {
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if (thread_type == ThreadType::kCompositing &&
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pump_type_hint == MessagePumpType::UI &&
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!g_above_normal_compositing_browser) {
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// Ignore kCompositing thread type for UI thread as Windows has a
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// priority boost mechanism. See
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// https://docs.microsoft.com/en-us/windows/win32/procthread/priority-boosts
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return;
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}
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PlatformThreadHandle::Handle thread_handle =
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PlatformThread::CurrentHandle().platform_handle();
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if (!g_use_thread_priority_lowest && thread_type != ThreadType::kBackground) {
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// Exit background mode if the new priority is not BACKGROUND. This is a
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// no-op if not in background mode.
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::SetThreadPriority(thread_handle, THREAD_MODE_BACKGROUND_END);
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// We used to DCHECK that memory priority is MEMORY_PRIORITY_NORMAL here,
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// but found that it is not always the case (e.g. in the installer).
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// crbug.com/1340578#c2
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}
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int desired_priority = THREAD_PRIORITY_ERROR_RETURN;
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switch (thread_type) {
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case ThreadType::kBackground:
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// Using THREAD_MODE_BACKGROUND_BEGIN instead of THREAD_PRIORITY_LOWEST
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// improves input latency and navigation time. See
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// https://docs.google.com/document/d/16XrOwuwTwKWdgPbcKKajTmNqtB4Am8TgS9GjbzBYLc0
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//
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// MSDN recommends THREAD_MODE_BACKGROUND_BEGIN for threads that perform
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// background work, as it reduces disk and memory priority in addition to
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// CPU priority.
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desired_priority =
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g_use_thread_priority_lowest.load(std::memory_order_relaxed)
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? THREAD_PRIORITY_LOWEST
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: THREAD_MODE_BACKGROUND_BEGIN;
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break;
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case ThreadType::kUtility:
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desired_priority = THREAD_PRIORITY_BELOW_NORMAL;
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break;
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case ThreadType::kResourceEfficient:
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case ThreadType::kDefault:
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desired_priority = THREAD_PRIORITY_NORMAL;
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break;
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case ThreadType::kCompositing:
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case ThreadType::kDisplayCritical:
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desired_priority = THREAD_PRIORITY_ABOVE_NORMAL;
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break;
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case ThreadType::kRealtimeAudio:
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desired_priority = THREAD_PRIORITY_TIME_CRITICAL;
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break;
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}
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DCHECK_NE(desired_priority, THREAD_PRIORITY_ERROR_RETURN);
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[[maybe_unused]] const BOOL success =
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::SetThreadPriority(thread_handle, desired_priority);
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DPLOG_IF(ERROR, !success)
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<< "Failed to set thread priority to " << desired_priority;
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if (!g_use_thread_priority_lowest && thread_type == ThreadType::kBackground) {
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// In a background process, THREAD_MODE_BACKGROUND_BEGIN lowers the memory
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// and I/O priorities but not the CPU priority (kernel bug?). Use
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// THREAD_PRIORITY_LOWEST to also lower the CPU priority.
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// https://crbug.com/901483
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if (PlatformThread::GetCurrentThreadPriorityForTest() !=
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ThreadPriorityForTest::kBackground) {
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::SetThreadPriority(thread_handle, THREAD_PRIORITY_LOWEST);
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// We used to DCHECK that memory priority is MEMORY_PRIORITY_VERY_LOW
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// here, but found that it is not always the case (e.g. in the installer).
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// crbug.com/1340578#c2
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}
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}
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}
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void SetCurrentThreadQualityOfService(ThreadType thread_type) {
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// QoS and power throttling were introduced in Win10 1709
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if (win::GetVersion() < win::Version::WIN10_RS3) {
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return;
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}
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static const auto set_thread_information_fn =
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reinterpret_cast<decltype(&::SetThreadInformation)>(::GetProcAddress(
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::GetModuleHandle(L"kernel32.dll"), "SetThreadInformation"));
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DCHECK(set_thread_information_fn);
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bool desire_ecoqos = false;
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switch (thread_type) {
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case ThreadType::kBackground:
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case ThreadType::kUtility:
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case ThreadType::kResourceEfficient:
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desire_ecoqos = true;
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break;
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case ThreadType::kDefault:
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case ThreadType::kCompositing:
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case ThreadType::kDisplayCritical:
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case ThreadType::kRealtimeAudio:
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desire_ecoqos = false;
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break;
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}
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THREAD_POWER_THROTTLING_STATE thread_power_throttling_state{
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.Version = THREAD_POWER_THROTTLING_CURRENT_VERSION,
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.ControlMask =
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desire_ecoqos ? THREAD_POWER_THROTTLING_EXECUTION_SPEED : 0ul,
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.StateMask =
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desire_ecoqos ? THREAD_POWER_THROTTLING_EXECUTION_SPEED : 0ul,
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};
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[[maybe_unused]] const BOOL success = set_thread_information_fn(
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::GetCurrentThread(), ::ThreadPowerThrottling,
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&thread_power_throttling_state, sizeof(thread_power_throttling_state));
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DPLOG_IF(ERROR, !success)
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<< "Failed to set EcoQoS to " << std::boolalpha << desire_ecoqos;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
namespace internal {
|
|
|
|
void SetCurrentThreadTypeImpl(ThreadType thread_type,
|
|
MessagePumpType pump_type_hint) {
|
|
SetCurrentThreadPriority(thread_type, pump_type_hint);
|
|
SetCurrentThreadQualityOfService(thread_type);
|
|
}
|
|
|
|
} // namespace internal
|
|
|
|
// static
|
|
ThreadPriorityForTest PlatformThread::GetCurrentThreadPriorityForTest() {
|
|
static_assert(
|
|
THREAD_PRIORITY_IDLE < 0,
|
|
"THREAD_PRIORITY_IDLE is >= 0 and will incorrectly cause errors.");
|
|
static_assert(
|
|
THREAD_PRIORITY_LOWEST < 0,
|
|
"THREAD_PRIORITY_LOWEST is >= 0 and will incorrectly cause errors.");
|
|
static_assert(THREAD_PRIORITY_BELOW_NORMAL < 0,
|
|
"THREAD_PRIORITY_BELOW_NORMAL is >= 0 and will incorrectly "
|
|
"cause errors.");
|
|
static_assert(
|
|
THREAD_PRIORITY_NORMAL == 0,
|
|
"The logic below assumes that THREAD_PRIORITY_NORMAL is zero. If it is "
|
|
"not, ThreadPriorityForTest::kBackground may be incorrectly detected.");
|
|
static_assert(THREAD_PRIORITY_ABOVE_NORMAL >= 0,
|
|
"THREAD_PRIORITY_ABOVE_NORMAL is < 0 and will incorrectly be "
|
|
"translated to ThreadPriorityForTest::kBackground.");
|
|
static_assert(THREAD_PRIORITY_HIGHEST >= 0,
|
|
"THREAD_PRIORITY_HIGHEST is < 0 and will incorrectly be "
|
|
"translated to ThreadPriorityForTest::kBackground.");
|
|
static_assert(THREAD_PRIORITY_TIME_CRITICAL >= 0,
|
|
"THREAD_PRIORITY_TIME_CRITICAL is < 0 and will incorrectly be "
|
|
"translated to ThreadPriorityForTest::kBackground.");
|
|
static_assert(THREAD_PRIORITY_ERROR_RETURN >= 0,
|
|
"THREAD_PRIORITY_ERROR_RETURN is < 0 and will incorrectly be "
|
|
"translated to ThreadPriorityForTest::kBackground.");
|
|
|
|
const int priority =
|
|
::GetThreadPriority(PlatformThread::CurrentHandle().platform_handle());
|
|
|
|
// Negative values represent a background priority. We have observed -3, -4,
|
|
// -6 when THREAD_MODE_BACKGROUND_* is used. THREAD_PRIORITY_IDLE,
|
|
// THREAD_PRIORITY_LOWEST and THREAD_PRIORITY_BELOW_NORMAL are other possible
|
|
// negative values.
|
|
if (priority < THREAD_PRIORITY_BELOW_NORMAL)
|
|
return ThreadPriorityForTest::kBackground;
|
|
|
|
switch (priority) {
|
|
case THREAD_PRIORITY_BELOW_NORMAL:
|
|
return ThreadPriorityForTest::kUtility;
|
|
case THREAD_PRIORITY_NORMAL:
|
|
return ThreadPriorityForTest::kNormal;
|
|
case kWinDisplayPriority1:
|
|
[[fallthrough]];
|
|
case kWinDisplayPriority2:
|
|
return ThreadPriorityForTest::kDisplay;
|
|
case THREAD_PRIORITY_ABOVE_NORMAL:
|
|
case THREAD_PRIORITY_HIGHEST:
|
|
return ThreadPriorityForTest::kDisplay;
|
|
case THREAD_PRIORITY_TIME_CRITICAL:
|
|
return ThreadPriorityForTest::kRealtimeAudio;
|
|
case THREAD_PRIORITY_ERROR_RETURN:
|
|
DPCHECK(false) << "::GetThreadPriority error";
|
|
}
|
|
|
|
NOTREACHED() << "::GetThreadPriority returned " << priority << ".";
|
|
return ThreadPriorityForTest::kNormal;
|
|
}
|
|
|
|
void InitializePlatformThreadFeatures() {
|
|
g_use_thread_priority_lowest.store(
|
|
FeatureList::IsEnabled(kUseThreadPriorityLowest),
|
|
std::memory_order_relaxed);
|
|
g_above_normal_compositing_browser.store(
|
|
FeatureList::IsEnabled(kAboveNormalCompositingBrowserWin),
|
|
std::memory_order_relaxed);
|
|
}
|
|
|
|
// static
|
|
size_t PlatformThread::GetDefaultThreadStackSize() {
|
|
return 0;
|
|
}
|
|
|
|
} // namespace base
|