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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>
82 lines
2.6 KiB
C++
82 lines
2.6 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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#include "util/fuchsia/scoped_task_suspend.h"
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#include <zircon/process.h>
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#include <zircon/syscalls.h>
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#include <zircon/syscalls/debug.h>
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#include <vector>
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#include "base/fuchsia/fuchsia_logging.h"
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#include "base/fuchsia/scoped_zx_handle.h"
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#include "base/logging.h"
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#include "util/fuchsia/koid_utilities.h"
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namespace crashpad {
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namespace {
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zx_obj_type_t GetHandleType(zx_handle_t handle) {
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zx_info_handle_basic_t basic;
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zx_status_t status = zx_object_get_info(
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handle, ZX_INFO_HANDLE_BASIC, &basic, sizeof(basic), nullptr, nullptr);
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if (status != ZX_OK) {
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ZX_LOG(ERROR, status) << "zx_object_get_info";
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return ZX_OBJ_TYPE_NONE;
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}
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return basic.type;
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}
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// Returns the suspend token of the suspended thread. This function attempts
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// to wait a short time for the thread to actually suspend before returning
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// but this is not guaranteed.
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base::ScopedZxHandle SuspendThread(zx_handle_t thread) {
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zx_handle_t token = ZX_HANDLE_INVALID;
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zx_status_t status = zx_task_suspend_token(thread, &token);
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if (status != ZX_OK) {
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ZX_LOG(ERROR, status) << "zx_task_suspend";
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base::ScopedZxHandle();
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}
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zx_signals_t observed = 0u;
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if (zx_object_wait_one(thread, ZX_THREAD_SUSPENDED,
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zx_deadline_after(ZX_MSEC(50)), &observed) != ZX_OK) {
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LOG(ERROR) << "thread failed to suspend";
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}
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return base::ScopedZxHandle(token);
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}
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} // namespace
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ScopedTaskSuspend::ScopedTaskSuspend(zx_handle_t task) {
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DCHECK_NE(task, zx_process_self());
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DCHECK_NE(task, zx_thread_self());
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zx_obj_type_t type = GetHandleType(task);
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if (type == ZX_OBJ_TYPE_THREAD) {
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suspend_tokens_.push_back(SuspendThread(task));
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} else if (type == ZX_OBJ_TYPE_PROCESS) {
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for (const auto& thread : GetChildHandles(task, ZX_INFO_PROCESS_THREADS))
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suspend_tokens_.push_back(SuspendThread(thread.get()));
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} else {
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LOG(ERROR) << "unexpected handle type";
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}
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}
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ScopedTaskSuspend::~ScopedTaskSuspend() = default;
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} // namespace crashpad
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