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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _LIBUNWINDSTACK_THREAD_ENTRY_H
#define _LIBUNWINDSTACK_THREAD_ENTRY_H
#include <pthread.h>
#include <sys/types.h>
#include <ucontext.h>
#include <condition_variable>
#include <map>
#include <mutex>
namespace unwindstack {
enum WaitType : int {
WAIT_FOR_UCONTEXT = 1,
WAIT_FOR_UNWIND_TO_COMPLETE,
WAIT_FOR_THREAD_TO_RESTART,
};
class ThreadEntry {
public:
static ThreadEntry* Get(pid_t tid, bool create = true);
static void Remove(ThreadEntry* entry);
void Wake();
bool Wait(WaitType type);
void CopyUcontextFromSigcontext(void* sigcontext);
inline void Lock() {
mutex_.lock();
// Always reset the wait value since this could be the first or nth
// time this entry is locked.
wait_value_ = 0;
}
inline void Unlock() { mutex_.unlock(); }
inline ucontext_t* GetUcontext() { return &ucontext_; }
private:
ThreadEntry(pid_t tid);
~ThreadEntry();
pid_t tid_;
int ref_count_;
std::mutex mutex_;
std::mutex wait_mutex_;
std::condition_variable wait_cond_;
int wait_value_;
ucontext_t ucontext_;
static std::mutex entries_mutex_;
static std::map<pid_t, ThreadEntry*> entries_;
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_THREAD_ENTRY_H
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