2c43cff01d
The object hierarchy was confusing and convoluted. This removes a lot of unnecessary code, and consolidates the BacktraceCurrent and BacktraceThread code into BacktraceCurrent. Change-Id: I01c8407d493712a48169df49dd3ff46db4a7c3ae
127 lines
3.4 KiB
C++
127 lines
3.4 KiB
C++
/*
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* Copyright (C) 2015 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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#include <pthread.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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#include <time.h>
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#include <ucontext.h>
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#include "BacktraceLog.h"
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#include "ThreadEntry.h"
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// Initialize static member variables.
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ThreadEntry* ThreadEntry::list_ = nullptr;
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pthread_mutex_t ThreadEntry::list_mutex_ = PTHREAD_MUTEX_INITIALIZER;
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// Assumes that ThreadEntry::list_mutex_ has already been locked before
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// creating a ThreadEntry object.
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ThreadEntry::ThreadEntry(pid_t pid, pid_t tid)
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: pid_(pid), tid_(tid), ref_count_(1), mutex_(PTHREAD_MUTEX_INITIALIZER),
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wait_mutex_(PTHREAD_MUTEX_INITIALIZER), wait_value_(0),
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next_(ThreadEntry::list_), prev_(nullptr) {
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pthread_condattr_t attr;
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pthread_condattr_init(&attr);
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pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
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pthread_cond_init(&wait_cond_, &attr);
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// Add ourselves to the list.
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if (ThreadEntry::list_) {
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ThreadEntry::list_->prev_ = this;
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}
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ThreadEntry::list_ = this;
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}
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ThreadEntry* ThreadEntry::Get(pid_t pid, pid_t tid, bool create) {
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pthread_mutex_lock(&ThreadEntry::list_mutex_);
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ThreadEntry* entry = list_;
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while (entry != nullptr) {
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if (entry->Match(pid, tid)) {
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break;
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}
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entry = entry->next_;
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}
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if (!entry) {
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if (create) {
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entry = new ThreadEntry(pid, tid);
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}
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} else {
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entry->ref_count_++;
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}
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pthread_mutex_unlock(&ThreadEntry::list_mutex_);
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return entry;
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}
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void ThreadEntry::Remove(ThreadEntry* entry) {
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pthread_mutex_unlock(&entry->mutex_);
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pthread_mutex_lock(&ThreadEntry::list_mutex_);
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if (--entry->ref_count_ == 0) {
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delete entry;
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}
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pthread_mutex_unlock(&ThreadEntry::list_mutex_);
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}
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// Assumes that ThreadEntry::list_mutex_ has already been locked before
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// deleting a ThreadEntry object.
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ThreadEntry::~ThreadEntry() {
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if (list_ == this) {
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list_ = next_;
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} else {
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if (next_) {
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next_->prev_ = prev_;
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}
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prev_->next_ = next_;
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}
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next_ = nullptr;
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prev_ = nullptr;
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pthread_cond_destroy(&wait_cond_);
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}
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void ThreadEntry::Wait(int value) {
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timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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ts.tv_sec += 10;
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pthread_mutex_lock(&wait_mutex_);
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while (wait_value_ != value) {
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int ret = pthread_cond_timedwait(&wait_cond_, &wait_mutex_, &ts);
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if (ret != 0) {
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BACK_LOGW("pthread_cond_timedwait failed: %s", strerror(ret));
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break;
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}
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}
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pthread_mutex_unlock(&wait_mutex_);
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}
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void ThreadEntry::Wake() {
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pthread_mutex_lock(&wait_mutex_);
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wait_value_++;
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pthread_mutex_unlock(&wait_mutex_);
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pthread_cond_signal(&wait_cond_);
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}
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void ThreadEntry::CopyUcontextFromSigcontext(void* sigcontext) {
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ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(sigcontext);
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// The only thing the unwinder cares about is the mcontext data.
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memcpy(&ucontext_.uc_mcontext, &ucontext->uc_mcontext, sizeof(ucontext->uc_mcontext));
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}
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