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639cba075c
We are transitioning to a token-based API and will be removing the old one. Changes to use a thread state wait rather than reading the registers in a loop to determine when the thread is actually suspended. Change-Id: I4b015bb0fc74b15177304a62be6c1d9a59b45c80 Reviewed-on: https://chromium-review.googlesource.com/1100170 Commit-Queue: Brett Wilson <brettw@chromium.org> Reviewed-by: Scott Graham <scottmg@chromium.org>
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
// Copyright 2018 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_UTIL_FUCHSIA_SCOPED_TASK_SUSPEND_H_
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#define CRASHPAD_UTIL_FUCHSIA_SCOPED_TASK_SUSPEND_H_
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#include <zircon/types.h>
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#include <vector>
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#include "base/fuchsia/scoped_zx_handle.h"
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#include "base/macros.h"
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namespace crashpad {
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//! \brief Manages the suspension of another task.
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//!
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//! The underlying API only supports suspending threads (despite its name) not
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//! entire tasks. As a result, it's possible some threads may not be correctly
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//! suspended/resumed as their creation might race enumeration.
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//!
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//! Additionally, suspending a thread is asynchronous and may take an
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//! arbitrary amount of time.
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//!
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//! Because of these limitations, this class is limited to being a best-effort,
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//! and correct suspension/resumption cannot be relied upon.
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//!
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//! Callers should not attempt to suspend the current task as obtained via
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//! `zx_process_self()`.
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class ScopedTaskSuspend {
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public:
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explicit ScopedTaskSuspend(zx_handle_t task);
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~ScopedTaskSuspend();
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private:
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// Could be one (for a thread) or many (for every process in a thread).
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std::vector<base::ScopedZxHandle> suspend_tokens_;
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DISALLOW_COPY_AND_ASSIGN(ScopedTaskSuspend);
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_FUCHSIA_SCOPED_TASK_SUSPEND_H_
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