aa63d9f980
This guarantees that any application is not also using this signal for some other purpose. Change-Id: I7c9bbb0ec8bb4e13322ecda951bcd43c6bf6ee1a
99 lines
2.7 KiB
C++
99 lines
2.7 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 <signal.h>
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#include <sys/types.h>
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#include "BacktraceImpl.h"
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enum state_e {
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STATE_WAITING = 0,
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STATE_DUMPING,
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STATE_DONE,
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STATE_CANCEL,
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};
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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 BacktraceThreadInterface;
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struct ThreadEntry {
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ThreadEntry(
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BacktraceThreadInterface* impl, pid_t pid, pid_t tid,
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size_t num_ignore_frames);
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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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static ThreadEntry* AddThreadToUnwind(
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BacktraceThreadInterface* thread_intf, pid_t pid, pid_t tid,
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size_t num_ignored_frames);
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BacktraceThreadInterface* thread_intf;
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pid_t pid;
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pid_t tid;
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ThreadEntry* next;
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ThreadEntry* prev;
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int32_t state;
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int num_ignore_frames;
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};
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// Interface class that does not contain any local storage, only defines
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// virtual functions to be defined by subclasses.
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class BacktraceThreadInterface {
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public:
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virtual ~BacktraceThreadInterface() { }
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virtual void ThreadUnwind(
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siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames) = 0;
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};
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class BacktraceThread : public BacktraceCurrent {
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public:
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// impl and thread_intf should point to the same object, this allows
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// the compiler to catch if an implementation does not properly
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// subclass both.
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BacktraceThread(
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BacktraceImpl* impl, BacktraceThreadInterface* thread_intf, pid_t tid,
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BacktraceMap* map);
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virtual ~BacktraceThread();
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virtual bool Unwind(size_t num_ignore_frames);
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virtual void ThreadUnwind(
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siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames) {
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thread_intf_->ThreadUnwind(siginfo, sigcontext, num_ignore_frames);
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}
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private:
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virtual bool TriggerUnwindOnThread(ThreadEntry* entry);
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virtual void FinishUnwind();
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BacktraceThreadInterface* thread_intf_;
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};
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#endif // _LIBBACKTRACE_BACKTRACE_THREAD_H
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