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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 _LIBBACKTRACE_BACKTRACE_THREAD_H
#define _LIBBACKTRACE_BACKTRACE_THREAD_H
#include <inttypes.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <ucontext.h>
#include "BacktraceImpl.h"
// The signal used to cause a thread to dump the stack.
#if defined(__GLIBC__)
// GLIBC reserves __SIGRTMIN signals, so use SIGRTMIN to avoid errors.
#define THREAD_SIGNAL SIGRTMIN
#else
#define THREAD_SIGNAL (__SIGRTMIN+1)
#endif
class ThreadEntry {
public:
static ThreadEntry* Get(pid_t pid, pid_t tid, bool create = true);
static void Remove(ThreadEntry* entry);
void Wake();
void Wait(int);
void CopyUcontextFromSigcontext(void*);
inline void Lock() {
pthread_mutex_lock(&mutex_);
// Reset the futex value in case of multiple unwinds of the same thread.
futex_ = 0;
}
inline void Unlock() {
pthread_mutex_unlock(&mutex_);
}
inline ucontext_t* GetUcontext() { return &ucontext_; }
private:
ThreadEntry(pid_t pid, pid_t tid);
~ThreadEntry();
bool Match(pid_t chk_pid, pid_t chk_tid) { return (chk_pid == pid_ && chk_tid == tid_); }
pid_t pid_;
pid_t tid_;
int futex_;
int ref_count_;
pthread_mutex_t mutex_;
ThreadEntry* next_;
ThreadEntry* prev_;
ucontext_t ucontext_;
static ThreadEntry* list_;
static pthread_mutex_t list_mutex_;
};
class BacktraceThread : public BacktraceCurrent {
public:
BacktraceThread(BacktraceImpl* impl, pid_t tid, BacktraceMap* map);
virtual ~BacktraceThread();
virtual bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext);
};
#endif // _LIBBACKTRACE_BACKTRACE_THREAD_H
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