blob: b5dfcd7bf12bbcdc58299b395d00d4e49c4cb752 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// Copyright 2019 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.
#ifndef BASE_PROFILER_SUSPENDABLE_THREAD_DELEGATE_H_
#define BASE_PROFILER_SUSPENDABLE_THREAD_DELEGATE_H_
#include <vector>
#include "base/base_export.h"
#include "base/profiler/register_context.h"
#include "base/profiler/thread_delegate.h"
namespace base {
// Platform-specific thread and stack manipulation delegate, for use by the
// platform-independent stack copying/walking implementation in
// StackSamplerImpl for suspension-based stack copying.
//
// IMPORTANT NOTE: Most methods in this interface are invoked while the target
// thread is suspended so must not do any allocation from the heap, including
// indirectly via use of DCHECK/CHECK or other logging statements. Otherwise the
// implementation can deadlock on heap locks acquired by the target thread
// before it was suspended. These functions are commented with "NO HEAP
// ALLOCATIONS".
class BASE_EXPORT SuspendableThreadDelegate : public ThreadDelegate {
public:
// Implementations of this interface should suspend the thread for the
// object's lifetime. NO HEAP ALLOCATIONS between the time the thread is
// suspended and resumed.
class BASE_EXPORT ScopedSuspendThread {
public:
ScopedSuspendThread() = default;
virtual ~ScopedSuspendThread() = default;
ScopedSuspendThread(const ScopedSuspendThread&) = delete;
ScopedSuspendThread& operator=(const ScopedSuspendThread&) = delete;
virtual bool WasSuccessful() const = 0;
};
SuspendableThreadDelegate() = default;
// Creates an object that holds the thread suspended for its lifetime.
virtual std::unique_ptr<ScopedSuspendThread> CreateScopedSuspendThread() = 0;
// Gets the register context for the thread.
// NO HEAP ALLOCATIONS.
virtual bool GetThreadContext(RegisterContext* thread_context) = 0;
// Returns true if the thread's stack can be copied, where the bottom address
// of the thread is at |stack_pointer|.
// NO HEAP ALLOCATIONS.
virtual bool CanCopyStack(uintptr_t stack_pointer) = 0;
};
} // namespace base
#endif // BASE_PROFILER_SUSPENDABLE_THREAD_DELEGATE_H_
|
