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84 lines
2.2 KiB
84 lines
2.2 KiB
#ifndef ANDROID_DVR_PERFORMANCED_TASK_H_
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#define ANDROID_DVR_PERFORMANCED_TASK_H_
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#include <sys/types.h>
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#include <array>
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#include <cstdio>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include <android-base/unique_fd.h>
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#include "unique_file.h"
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namespace android {
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namespace dvr {
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// Task provides access to task-related information from the procfs
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// pseudo-filesystem.
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class Task {
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public:
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explicit Task(pid_t task_id);
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bool IsValid() const { return task_fd_.get() >= 0; }
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explicit operator bool() const { return IsValid(); }
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pid_t task_id() const { return task_id_; }
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std::string name() const { return name_; }
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pid_t thread_group_id() const { return thread_group_id_; }
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pid_t parent_process_id() const { return parent_process_id_; }
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size_t thread_count() const { return thread_count_; }
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uint32_t cpus_allowed_mask() const { return cpus_allowed_mask_; }
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const std::string& cpus_allowed_list() const { return cpus_allowed_list_; }
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const std::array<int, 4>& user_id() const { return user_id_; }
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const std::array<int, 4>& group_id() const { return group_id_; }
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// Indices into user and group id arrays.
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enum {
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kUidReal = 0,
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kUidEffective,
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kUidSavedSet,
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kUidFilesystem,
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};
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std::string GetCpuSetPath() const;
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private:
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pid_t task_id_;
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base::unique_fd task_fd_;
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// Fields read from /proc/<task_id_>/status.
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std::string name_;
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pid_t thread_group_id_;
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pid_t parent_process_id_;
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std::array<int, 4> user_id_;
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std::array<int, 4> group_id_;
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size_t thread_count_;
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uint32_t cpus_allowed_mask_;
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std::string cpus_allowed_list_;
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// Opens the file /proc/<task_id_>/|name| and returns the open file
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// descriptor.
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base::unique_fd OpenTaskFile(const std::string& name) const;
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// Similar to OpenTaskFile() but returns a file pointer.
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UniqueFile OpenTaskFilePointer(const std::string& name) const;
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// Reads the field named |field| from /proc/<task_id_>/status.
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std::string GetStatusField(const std::string& field) const;
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// Reads a subset of the fields in /proc/<task_id_>/status.
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void ReadStatusFields();
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Task(const Task&) = delete;
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void operator=(const Task&) = delete;
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};
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} // namespace dvr
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} // namespace android
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#endif // ANDROID_DVR_PERFORMANCED_TASK_H_
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