a2efd3ac7a
This new version doesn't require any specialized thread implementation, it uses the Current implementation to do its job. In addition, it runs much faster when multiple threads are trying to unwind at the same time since the global signal lock is held for only a small amount of time. Even running through the threads one at a time should be faster since it no longer requires two passes through the unwound stacks. The new code now allows multiple simultaneous unwinds of the same thread. Finally, add the ability to unwind from a ucontext_t passed in. This functionality doesn't work for remote unwinds yet. Change-Id: I4d181d7ca5ffd2acfd1686e668e6d21e36b425cb
90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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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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*/
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#ifndef _LIBBACKTRACE_BACKTRACE_THREAD_H
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#define _LIBBACKTRACE_BACKTRACE_THREAD_H
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#include <inttypes.h>
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#include <pthread.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/types.h>
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#include <ucontext.h>
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#include "BacktraceImpl.h"
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// The signal used to cause a thread to dump the stack.
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#if defined(__GLIBC__)
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// GLIBC reserves __SIGRTMIN signals, so use SIGRTMIN to avoid errors.
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#define THREAD_SIGNAL SIGRTMIN
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#else
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#define THREAD_SIGNAL (__SIGRTMIN+1)
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#endif
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class ThreadEntry {
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public:
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static ThreadEntry* Get(pid_t pid, pid_t tid, bool create = true);
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static void Remove(ThreadEntry* entry);
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inline void CopyUcontext(ucontext_t* ucontext) {
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memcpy(&ucontext_, ucontext, sizeof(ucontext_));
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}
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void Wake();
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void Wait(int);
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inline void Lock() {
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pthread_mutex_lock(&mutex_);
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// Reset the futex value in case of multiple unwinds of the same thread.
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futex_ = 0;
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}
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inline void Unlock() {
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pthread_mutex_unlock(&mutex_);
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}
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inline ucontext_t* GetUcontext() { return &ucontext_; }
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private:
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ThreadEntry(pid_t pid, pid_t tid);
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~ThreadEntry();
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bool Match(pid_t chk_pid, pid_t chk_tid) { return (chk_pid == pid_ && chk_tid == tid_); }
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pid_t pid_;
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pid_t tid_;
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int futex_;
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int ref_count_;
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pthread_mutex_t mutex_;
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ThreadEntry* next_;
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ThreadEntry* prev_;
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ucontext_t ucontext_;
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static ThreadEntry* list_;
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static pthread_mutex_t list_mutex_;
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};
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class BacktraceThread : public BacktraceCurrent {
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public:
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BacktraceThread(BacktraceImpl* impl, pid_t tid, BacktraceMap* map);
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virtual ~BacktraceThread();
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virtual bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext);
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};
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#endif // _LIBBACKTRACE_BACKTRACE_THREAD_H
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