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multi_queue_epoll_server.cpp
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multi_queue_epoll_server.cpp
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#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include <unistd.h>
#include <vector>
#include <iostream>
#include <thread>
#include <sys/epoll.h>
#include <arpa/inet.h>
#include <iostream>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <csignal>
#include <unordered_map>
#include "data.h"
#include "mullti_thread_worker.h"
using namespace std;
/*-------------------------------------------------
* global variables
* -------------------------------------------------
*/
#define NUM_WORKERS 20
#define ECHO_SERVER_PORT 6000
#define NUM_FD 1200
#define LISTEN_BACKLOG 16
#define MAX_EPOLL_EVENT_COUNT (NUM_FD>>2)
#define EPOLL_WAIT_TIMEOUT 0
// todo profiling purpose
static unsigned long JobCountLimit=2001000L;
static std::vector<MultiThreadWorker> works(NUM_WORKERS);
static int epoll_fd, server_fd;
static volatile bool running = true;
// event for the server
static struct epoll_event event;
static unsigned long long JobCount = 0;
static Package ClientInfoArr[NUM_FD];
static ProcessStatus FDProcessStatusArr[NUM_FD];
/*-------------------------------------------------
* function prototypes
* -------------------------------------------------
*/
void process(struct epoll_event *epollEvent);
void ProgramTerminated();
void ReceivePackage(struct epoll_event *epollEvent);
void SendResult(struct epoll_event *epollEvent);
void sig_handler(int sig) {
if (sig == SIGINT) {
printf("JobCount:%llu\t\n", JobCount);
ProgramTerminated();
}
}
// back end thread
void ProcessJob(int i) {
while (true) {
struct epoll_event epollEvent = works[i].PopJob();
if ((epollEvent.events) & EPOLLIN) {
// receive from the client
ReceivePackage(&epollEvent);
// works[i].popJob();
} else {
if ((epollEvent.events) & EPOLLOUT) {
// send to the client
SendResult(&epollEvent);
// works[i].popJob();
} else {
assert(false);
}
}
}
}
// deprecated version
Package receivePackage(int client_fd) {
// receive the Package from the client
char recvPackage[PACKAGE_BUFFER_SIZE];
Package buffer;
memset(&buffer, 0, sizeof(Package)); // clean to 0
ssize_t rs = recv(client_fd, recvPackage, PACKAGE_BUFFER_SIZE, 0);
memcpy(&buffer, recvPackage, sizeof(Package));
#ifdef DEBUG_OUTPUT
printf("recv over id:%u, key:%d, value:%d\n", (unsigned int) buffer.id, buffer.key.id, buffer.value.id);
#endif
return buffer;
}
// deprecated SendResult
void sendResult(int client_fd, Package &buffer) {
// send the response
int sendbytes;
Result result(buffer.id);
if ((sendbytes = send(client_fd, (char *) &result, sizeof(Result), 0)) == -1) {
perror("respond");
exit(1);
}
#ifdef DEBUG_OUTPUT
printf("send the Result, id:%d\n", result.id);
#endif
}
// current version
void ReceivePackage(struct epoll_event *epollEvent) {
int epollEventFD = epollEvent->data.fd;
// in receiving, so not in ready stage
assert(!FDProcessStatusArr[epollEventFD].ready_to_receive_);
// receive the Package from the client
Package buffer;
char recvPackage[PACKAGE_BUFFER_SIZE];
// Package buffer;
memset(&buffer, 0, sizeof(Package)); // clean to 0
int ret = recv(epollEventFD, recvPackage, PACKAGE_BUFFER_SIZE, 0);
if (ret <= 0) {
#ifdef DEBUG_OUTPUT
printf("close connection from fd: %d \n", epollEventFD);
#endif
// delete the event, last argument can be ignored
epoll_ctl(epoll_fd, EPOLL_CTL_DEL, epollEventFD, epollEvent);
// close fd
close(epollEventFD);
// update ready_to_send_ and ready_to_receive_ status
FDProcessStatusArr[epollEventFD].ready_to_send_ = true;
FDProcessStatusArr[epollEventFD].ready_to_receive_ = true;
return;
} else {
memcpy(&buffer, recvPackage, sizeof(Package));
#ifdef DEBUG_OUTPUT
printf("fd: %d \t recv over id:%u, key:%d, value:%d\n", epollEventFD, (unsigned int) buffer.id,
buffer.key.id, buffer.value.id);
#endif
}
#ifdef EDGE_TRIGGERED
epollEvent->events=EPOLLOUT | EPOLLET;
#else
epollEvent->events = EPOLLOUT;
#endif
// store the received information
ClientInfoArr[epollEventFD] = (buffer);
#ifdef DEBUG_OUTPUT
printf("Store clientInfo: fd: %d, value:%d \n", epollEventFD, buffer.value.id);
#endif
epoll_ctl(epoll_fd, EPOLL_CTL_MOD, epollEventFD, epollEvent);
// receive done, able to send
FDProcessStatusArr[epollEventFD].ready_to_send_ = true;
}
// current version
void SendResult(struct epoll_event *epollEvent) {
int epollEventFD = epollEvent->data.fd;
// in sending stage, so this fd is no longer in ready stage
assert(!FDProcessStatusArr[epollEventFD].ready_to_send_);
// send the response
#ifdef DEBUG_OUTPUT
printf("Read ClientInfoArr: fd: %d, value:%d \n", epollEventFD,
ClientInfoArr[epollEventFD].value.id);
#endif
Result result(ClientInfoArr[epollEventFD].value.id);
int sendbytes = send(epollEventFD, (char *) &result, sizeof(Result), 0);
if (sendbytes < 0) {
perror("send failed.\n");
return;
}
#ifdef EDGE_TRIGGERED
epollEvent->events=EPOLLIN | EPOLLET;
#else
epollEvent->events = EPOLLIN;
#endif
#ifdef DEBUG_OUTPUT
printf("fd: %d \t send the Result, id:%d\n", epollEventFD, result.id);
#endif
epoll_ctl(epoll_fd, EPOLL_CTL_MOD, epollEventFD, epollEvent);
// already send, so able to receive
FDProcessStatusArr[epollEventFD].ready_to_receive_ = true;
}
// receive and send together
void process(struct epoll_event *epollEvent) {
// receive the Package from the client
Package buffer;
char recvPackage[PACKAGE_BUFFER_SIZE];
// Package buffer;
memset(&buffer, 0, sizeof(Package)); // clean to 0
int ret = recv(epollEvent->data.fd, recvPackage, PACKAGE_BUFFER_SIZE, 0);
if (ret <= 0) {
#ifdef DEBUG_OUTPUT
printf("close connection from fd: %d \n", epollEvent->data.fd);
#endif
close(epollEvent->data.fd);
epoll_ctl(epoll_fd, EPOLL_CTL_DEL, epollEvent->data.fd, &event);
return;
} else {
#ifdef DEBUG_OUTPUT
printf("recv over id:%u, key:%d, value:%d\n", (unsigned int) buffer.id, buffer.key.id, buffer.value.id);
#endif
}
memcpy(&buffer, recvPackage, sizeof(Package));
// packages[i] = (buffer);// may use std::move
Result result(buffer.id);
int sendbytes = send(epollEvent->data.fd, (char *) &result, sizeof(Result), 0);
if (sendbytes < 0) {
perror("send failed.\n");
return;
}
#ifdef DEBUG_OUTPUT
printf("send the Result, id:%d\n", result.id);
#endif
}
void InitializeWorkers(std::vector<std::thread> &workers) {
for (int i = 0; i < NUM_WORKERS; ++i) {
workers.push_back(std::thread(ProcessJob, i));
workers.back().detach();
// if (workers[i].joinable()) {
// workers[i].detach();
// }
}
}
// todo may optimzie as pass by reference
inline void Polling(struct epoll_event epollEvent) {
works[JobCount % NUM_WORKERS].addJob(epollEvent);
#ifdef DEBUG_OUTPUT
printf("jobCount: %d \n", JobCount);
#endif
++JobCount;
}
void SetNonBlocking(int sock) {
int opts;
opts = fcntl(sock, F_GETFL);
if (opts < 0) {
perror("fcntl(sock,GETFL)");
exit(1);
}
opts = opts | O_NONBLOCK;
if (fcntl(sock, F_SETFL, opts) < 0) {
perror("fcntl(sock,SETFL,opts)");
exit(1);
}
}
void ProgramTerminated() {
running = false;
cout << "\n\nterminating the program..." << endl;
close(epoll_fd);
close(server_fd);
}
int main(int argc, char *argv[]) {
printf("start %s \n", argv[0]);
signal(SIGINT, sig_handler);
int i, maxi, server_fd, new_client_fd, sockfd, nfds/*number of fd s*/, portnumber;
ssize_t n;
socklen_t length;
if (argc == 2) {
if ((portnumber = atoi(argv[1])) < 0) {
fprintf(stderr, "Usage:%s PORT_NUMBER/a/n", argv[0]);
return 1;
}
} else {
portnumber = SERVER_PORT;
}
// the event_array is reponsible for active epoll event
struct epoll_event event_array[MAX_EPOLL_EVENT_COUNT];
epoll_fd = epoll_create(NUM_FD);
struct sockaddr_in client_addr;
struct sockaddr_in serveraddr;
server_fd = socket(AF_INET, SOCK_STREAM, 0);
// set to non blocking
SetNonBlocking(server_fd);
// set fd
event.data.fd = server_fd;
// in default, it is level triggered
#ifdef EDGE_TRIGGERED
event.events = EPOLLIN | EPOLLET;
#else
event.events = EPOLLIN;
#endif
// register epoll event
// 1st: epoll_create()'s return value,
// 2nd: add new fd into epoll_fd
// 3rd: fd needs to listen
// 4th: what needs to listen
// This system call is used to add, modify, or remove entries in the
// interest list of the epoll(7) instance referred to by the file
// descriptor epfd. It requests that the operation op be performed for
// the target file descriptor, fd.
epoll_ctl(epoll_fd, EPOLL_CTL_ADD, server_fd, &event);
bzero(&serveraddr, sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
// serveraddr.sin_addr.s_addr = htons(INADDR_ANY);
string local_addr = "127.0.0.1";
inet_aton(local_addr.c_str(), &(serveraddr.sin_addr));
serveraddr.sin_port = htons(portnumber);
bind(server_fd, (sockaddr * ) & serveraddr, sizeof(serveraddr));
listen(server_fd, MAX_EPOLL_EVENT_COUNT);
// initializeWorkers thread to work
std::vector<std::thread> workers(NUM_WORKERS);
InitializeWorkers(workers);
int nfds_old = 0;
while (running) {
// wait for epoll event to happen
// interface: int epoll_wait(int epoll_fd, struct epoll_event *event_array, int maxevents, int timeout);
// The epoll_wait() system call waits for events on the epoll(7)
// instance referred to by the file descriptor epfd.
// The memory area pointed to by events will contain
// the events that will be available for the caller.
// Up to maxevents are returned by epoll_wait().
// The maxevents argument must be greater than zero.
nfds = epoll_wait(epoll_fd, event_array, MAX_EPOLL_EVENT_COUNT, EPOLL_WAIT_TIMEOUT);
// handle all happeing event_array
#ifdef DEBUG_OUTPUT
if (nfds != nfds_old) {
printf("\nnumber of fd: %d\n", nfds);
nfds_old = nfds;
}
#endif
for (i = 0; i < nfds; ++i) {
Package buffer;
// if detect a new client connect to the server's socket,
// create a new connection
if (event_array[i].data.fd == server_fd) {
new_client_fd = accept(server_fd, (sockaddr * ) & client_addr, &length);
if (new_client_fd < 0) {
#ifdef DEBUG_OUTPUT
// output client fd
cout << "Error, new_client_fd: " << new_client_fd << endl;
#endif
perror("new_client_fd < 0");
exit(1);
}
SetNonBlocking(new_client_fd);
#ifdef DEBUG_OUTPUT
// output client fd
char *str = inet_ntoa(client_addr.sin_addr);
cout << "accept a connection from " << str;
cout << "\tfd: " << new_client_fd << endl;
#endif
// set the fd
event.data.fd = new_client_fd;
// register event to be reading
#ifdef EDGE_TRIGGERED
event.events = EPOLLIN | EPOLLET;
#else
event.events = EPOLLIN;
#endif
// todo may optimize to increase speed
// register this client fd as neither receiving nor sending
FDProcessStatusArr[(new_client_fd)] = ProcessStatus();
// create the space
ClientInfoArr[new_client_fd] = Package(-1);
// epoll_ctl - control interface for an epoll file descriptor
// int epoll_ctl(int epoll_fd, int op, int fd, struct epoll_event *event);
// It requests that the operation op be performed for the target file descriptor, fd.
// add event
epoll_ctl(epoll_fd, EPOLL_CTL_ADD, new_client_fd, &event);
} else {
if ((event_array[i].events & EPOLLIN)) {
if (FDProcessStatusArr[event_array[i].data.fd].ready_to_receive_) {
// go to receiving stage, so no longer in ready stage
FDProcessStatusArr[event_array[i].data.fd].ready_to_receive_ = false;
#ifdef DEBUG_OUTPUT
printf("fd: %d \t ready_to_receive_ polling\n", event_array[i].data.fd);
#endif
Polling(event_array[i]);
}
#ifdef DEBUG_OUTPUT
printf("fd: %d \t waiting for ready_to_receive_ condition \n", event_array[i].data.fd);
#endif
} else {
if ((event_array[i].events & EPOLLOUT)) {
if (FDProcessStatusArr[event_array[i].data.fd].ready_to_send_) {
// go to sending stage, so no longer in ready stage
FDProcessStatusArr[event_array[i].data.fd].ready_to_send_ = false;
#ifdef DEBUG_OUTPUT
printf("fd: %d \t ready_to_send_ polling\n", event_array[i].data.fd);
#endif
Polling(event_array[i]);
}
#ifdef DEBUG_OUTPUT
printf("fd: %d \t waiting for ready_to_send_ condition \n", event_array[i].data.fd);
#endif
}
}
#ifdef PROFILING
if (JobCount == JobCountLimit) {
printf("reach the JobCount\n");
cout<<"ratio:"<<1.0*smallNFDS/totalNFDS<<endl;
exit(0);
}
#endif
}
}
}
atexit(ProgramTerminated);
return 0;
}