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/*
* Copyright (C) 2015 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.
*/
#include <err.h>
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include <new>
#include "Action.h"
#include "Thread.h"
#include "Threads.h"
void* ThreadRunner(void* data) {
Thread* thread = reinterpret_cast<Thread*>(data);
while (true) {
thread->WaitForPending();
Action* action = thread->GetAction();
thread->AddTimeNsecs(action->Execute(thread->pointers()));
bool end_thread = action->EndThread();
thread->ClearPending();
if (end_thread) {
break;
}
}
return nullptr;
}
Threads::Threads(Pointers* pointers, size_t max_threads)
: pointers_(pointers), max_threads_(max_threads) {
size_t pagesize = getpagesize();
data_size_ = (max_threads_ * sizeof(Thread) + pagesize - 1) & ~(pagesize - 1);
max_threads_ = data_size_ / sizeof(Thread);
void* memory = mmap(nullptr, data_size_, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
if (memory == MAP_FAILED) {
err(1, "Failed to map in memory for Threads: map size %zu, max threads %zu\n",
data_size_, max_threads_);
}
if (Thread::ACTION_SIZE < Action::MaxActionSize()) {
err(1, "Thread action size is too small: ACTION_SIZE %zu, max size %zu\n",
Thread::ACTION_SIZE, Action::MaxActionSize());
}
threads_ = new (memory) Thread[max_threads_];
}
Threads::~Threads() {
if (threads_) {
munmap(threads_, data_size_);
threads_ = nullptr;
data_size_ = 0;
}
}
Thread* Threads::CreateThread(pid_t tid) {
if (num_threads_ == max_threads_) {
err(1, "Too many threads created, current max %zu.\n", num_threads_);
}
Thread* thread = FindEmptyEntry(tid);
if (thread == nullptr) {
err(1, "No empty entries found, current max %zu, num threads %zu\n",
max_threads_, num_threads_);
}
thread->tid_ = tid;
thread->pointers_ = pointers_;
thread->total_time_nsecs_ = 0;
if (pthread_create(&thread->thread_id_, nullptr, ThreadRunner, thread) == -1) {
err(1, "Failed to create thread %d: %s\n", tid, strerror(errno));
}
num_threads_++;
return thread;
}
Thread* Threads::FindThread(pid_t tid) {
size_t index = GetHashEntry(tid);
for (size_t entries = num_threads_; entries != 0; ) {
pid_t cur_tid = threads_[index].tid_;
if (cur_tid == tid) {
return threads_ + index;
}
if (cur_tid != 0) {
entries--;
}
if (++index == max_threads_) {
index = 0;
}
}
return nullptr;
}
void Threads::WaitForAllToQuiesce() {
for (size_t i = 0, threads = 0; threads < num_threads_; i++) {
pid_t cur_tid = threads_[i].tid_;
if (cur_tid != 0) {
threads++;
threads_[i].WaitForReady();
}
}
}
size_t Threads::GetHashEntry(pid_t tid) {
return tid % max_threads_;
}
Thread* Threads::FindEmptyEntry(pid_t tid) {
size_t index = GetHashEntry(tid);
for (size_t entries = 0; entries < max_threads_; entries++) {
if (threads_[index].tid_ == 0) {
return threads_ + index;
}
if (++index == max_threads_) {
index = 0;
}
}
return nullptr;
}
void Threads::Finish(Thread* thread) {
int ret = pthread_join(thread->thread_id_, nullptr);
if (ret != 0) {
fprintf(stderr, "pthread_join failed: %s\n", strerror(ret));
exit(1);
}
total_time_nsecs_ += thread->total_time_nsecs_;
thread->tid_ = 0;
num_threads_--;
}
void Threads::FinishAll() {
for (size_t i = 0; i < max_threads_; i++) {
if (threads_[i].tid_ != 0) {
threads_[i].CreateAction(0, "thread_done", nullptr);
threads_[i].SetPending();
Finish(threads_ + i);
}
}
}
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