我一直在寻找boost::fibers一种方法来处理我的一些数据处理和 IO 问题。特别shared_work是调度程序看起来很有希望，因为它可以让我为每个数据处理源启动一个数据处理任务，然后让它们根据需要在几个线程中相互分配。
然而，这让我想到了我的问题的根源：看起来我每个进程只能有一个shared_work“池”。如果我想在 4 个线程之间共享处理数据中的一组 12 根光纤，而同时另一组 12 根光纤正在将处理后的数据写入另外 4 个线程之间共享的文件，我该怎么办。
就像是：
#include<string>
#include<iostream>
#include<vector>
#include<mutex>
#include<thread>
#include<random>
#include<map>
#include<sstream>
#include<boost/bind.hpp>
#include<boost/fiber/all.hpp>
typedef boost::fibers::fiber FiberType;
typedef std::unique_lock<boost::fibers::mutex> LockType;
static const int fiberIterationCount = 5000;
static const int fiberCount = 12;
static const int threadCount = 4;
static const int distLowerLimit = 50;
static const int distUpperLimit = 500;
static boost::fibers::mutex firstMutex{};
static boost::fibers::mutex secondMutex{};
static boost::fibers::condition_variable firstCondition{};
static boost::fibers::condition_variable secondCondition{};
static boost::fibers::barrier synchronize{2*threadCount};
static int typeOneFibersFinished{0};
static int typeTwoFibersFinished{0};
static std::mt19937 typeOneGenerators[fiberCount];
static std::mt19937 typeTwoGenerators[fiberCount];
static std::mutex typeMapMutex;//lock for writing unnecessary for reads
static std::map<std::thread::id, std::string> threadTypeMap;
//simple function to give a heavy cpu load of variable duration
unsigned long long findPrimeNumber(int n)
{
int count=0;
unsigned long long a = 2;
while(count<n)
{
bool isPrime = true;
for(unsigned long long b = 2; (b * b) <= a; ++b)
{
if((a % b) == 0)
{
isPrime = false;
break;
}
}
if(isPrime)
{
count++;
}
++a;
}
return (a - 1);
}
void fiberTypeOne(int fiberNumber)
{
std::cout<<"Starting Type One Fiber #"<<fiberNumber;
std::uniform_int_distribution<int> dist(distLowerLimit, distUpperLimit);
for(int i=0; i<fiberIterationCount; ++i)
{
//generate a randomish load on this fiber so that it does not take a regular time slice
int tempPrime = dist(typeOneGenerators[fiberNumber]);
unsigned long long temp = findPrimeNumber(tempPrime);
std::cout << "T1 fiber #"<<fiberNumber<<" running on "<<threadTypeMap[std::this_thread::get_id()]
<<"\n Generated: "<<tempPrime<<", "<<temp;
boost::this_fiber::yield();
}
{
LockType lock(firstMutex);
++typeOneFibersFinished;
}
firstCondition.notify_all();
}
void threadTypeOne(int threadNumber)
{
//make a shared work scheduler that associates its fibers with "fiber pool 0"
boost::fibers::use_scheduling_algorithm< multi_pool_scheduler<0> >();
std::cout<<"Starting Type One Thread #"<<threadNumber<<" With Thread ID: "<<std::this_thread::get_id();
{
std::unique_lock<std::mutex> lock{typeMapMutex};
std::ostringstream gen;
gen<<"Thread Type 1 - Number: "<<threadNumber<<" with id: "<<std::this_thread::get_id();
threadTypeMap[std::this_thread::get_id()] = gen.str();
}
if(threadNumber == 0)
{ //if we are thread zero, create the fibers then join them to take ourselves off the "fiber list"
std::cout<<"Spawning Type One Fibers";
for(int fiberNumber=0; fiberNumber<fiberCount; ++fiberNumber)
{//create the fibers and instantly detach them
FiberType(boost::bind(&fiberTypeOne, fiberNumber)).detach();
}
}
synchronize.wait();
std::cout<<"T1 Thread preparing to wait";
//now let the fibers do their thing
LockType lock(firstMutex);
firstCondition.wait(lock, [](){return (typeOneFibersFinished == fiberCount);});
}
void fiberTypeTwo(int fiberNumber)
{
std::cout<<"Starting Type Two Fiber #"<<fiberNumber;
std::uniform_int_distribution<int> dist(distLowerLimit, distUpperLimit);
for(int i=0; i<fiberIterationCount; ++i)
{
//generate a randomish load on this fiber so that it does not take a regular time slice
int tempPrime = dist(typeTwoGenerators[fiberNumber]);
unsigned long long temp = findPrimeNumber(tempPrime);
std::cout << "T2 fiber #"<<fiberNumber<<" running on "<<threadTypeMap[std::this_thread::get_id()]
<<"\n Generated: "<<tempPrime<<", "<<temp;
boost::this_fiber::yield();
}
{
LockType lock(secondMutex);
++typeTwoFibersFinished;
}
secondCondition.notify_all();
}
void threadTypeTwo(int threadNumber)
{
//make a shared work scheduler that associates its fibers with "fiber pool 1"
boost::fibers::use_scheduling_algorithm< multi_pool_scheduler<1> >();
std::cout<<"Starting Type Two Thread #"<<threadNumber<<" With Thread ID: "<<std::this_thread::get_id();
{
std::unique_lock<std::mutex> lock{typeMapMutex};
std::ostringstream gen;
gen<<"Thread Type 2 - Number: "<<threadNumber<<" with id: "<<std::this_thread::get_id();
threadTypeMap[std::this_thread::get_id()] = gen.str();
}
if(threadNumber == 0)
{ //if we are thread zero, create the fibers then join them to take ourselves off the "fiber list"
std::cout<<"Spawning Type Two Fibers";
for(int fiberNumber=0; fiberNumber<fiberCount; ++fiberNumber)
{//create the fibers and instantly detach them
FiberType(boost::bind(&fiberTypeTwo, fiberNumber)).detach();
}
}
synchronize.wait();
std::cout<<"T2 Thread preparing to wait";
//now let the fibers do their thing
LockType lock(secondMutex);
secondCondition.wait(lock, [](){return (typeTwoFibersFinished == fiberCount);});
}
int main(int argc, char* argv[])
{
std::cout<<"Initializing Random Number Generators";
for(unsigned i=0; i<fiberCount; ++i)
{
typeOneGenerators->seed(i*500U - 1U);
typeTwoGenerators->seed(i*1500U - 1U);
}
std::cout<<"Commencing Main Thread Startup Startup";
std::vector<std::thread> typeOneThreads;
std::vector<std::thread> typeTwoThreads;
for(int i=0; i<threadCount; ++i)
{
typeOneThreads.emplace_back(std::thread(boost::bind(&threadTypeOne, i)));
typeTwoThreads.emplace_back(std::thread(boost::bind(&threadTypeTwo, i)));
}
//now let the threads do their thing and wait for them to finish with join
for(unsigned i=0; i<threadCount; ++i)
{
typeOneThreads[i].join();
}
for(unsigned i=0; i<threadCount; ++i)
{
typeTwoThreads[i].join();
}
std::cout<<"Shutting Down";
return 0;
}
如果不编写自己的光纤调度程序，这可能吗？如果是这样，怎么做？