15 KiB
高性能网络协程库,支持 Linux/BSD/Mac/Windows
1、概述
本协程库为 acl 工程 的协程模块,该模块提供了 C 库和 C++ 库,其中 C 库实现了有关协程的核心功能,C++ 库是对 C 库的封装,从而更方便使用者快速开发协程类应用。目前支持的操作系统有:Linux,FreeBSD,MacOS 和 Windows,支持的事件类型有:select,poll,epoll,kqueue,iocp 及 Windows GUI 窗口消息。通过 libfiber 网络协程库,用户可以非常容易地写出高性能、高可靠的网络通信服务。因为使用了同步顺序编程的思维方式,相对于异步模式(无论是 reactor 模型还是 proactor 模型),编写网络应用更加简单。
libfiber 不仅支持常见的 IO 事件引擎,而且支持 Win32 GUI 界面消息引擎,这样当你使用 MFC,wtl 或其它 GUI 界面库编写界面网络应用时,也会变得异常简单,这的确是件令人兴奋的事。
2、支持的事件引擎
以下为 libfiber 所支持的事件引擎:
Event | Linux | BSD | Mac | Windows |
---|---|---|---|---|
select | yes | yes | yes | yes |
poll | yes | yes | yes | yes |
epoll | yes | no | no | no |
kqueue | no | yes | yes | no |
iocp | no | no | no | yes |
Win GUI message | no | no | no | yes |
3、示例
3.1、基于协程的网络服务器
// fiber_server.c
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "fiber/lib_fiber.h"
#include "patch.h" // in lib_fiber/samples/patch.h
static size_t __stack_size = 128000;
static const char *__listen_ip = "127.0.0.1";
static int __listen_port = 9001;
static void fiber_client(ACL_FIBER *fb, void *ctx)
{
SOCKET *pfd = (SOCKET *) ctx;
char buf[8192];
while (1) {
#if defined(_WIN32) || defined(_WIN64)
int ret = acl_fiber_recv(*pfd, buf, sizeof(buf), 0);
#else
int ret = recv(*pfd, buf, sizeof(buf), 0);
#endif
if (ret == 0) {
break;
} else if (ret < 0) {
if (acl_fiber_last_error() == FIBER_EINTR) {
continue;
}
break;
}
#if defined(_WIN32) || defined(_WIN64)
if (acl_fiber_send(*pfd, buf, ret, 0) < 0) {
#else
if (send(*pfd, buf, ret, 0) < 0) {
#endif
break;
}
}
socket_close(*pfd);
free(pfd);
}
static void fiber_accept(ACL_FIBER *fb, void *ctx)
{
const char *addr = (const char *) ctx;
SOCKET lfd = socket_listen(__listen_ip, __listen_port);
assert(lfd >= 0);
for (;;) {
SOCKET *pfd, cfd = socket_accept(lfd);
if (cfd == INVALID_SOCKET) {
printf("accept error %s\r\n", acl_fiber_last_serror());
break;
}
pfd = (SOCKET *) malloc(sizeof(SOCKET));
*pfd = cfd;
// create and start one fiber to handle the client socket IO
acl_fiber_create(fiber_client, pfd, __stack_size);
}
socket_close(lfd);
exit (0);
}
// FIBER_EVENT_KERNEL represents the event type on
// Linux(epoll), BSD(kqueue), Mac(kqueue), Windows(iocp)
// FIBER_EVENT_POLL: poll on Linux/BSD/Mac/Windows
// FIBER_EVENT_SELECT: select on Linux/BSD/Mac/Windows
// FIBER_EVENT_WMSG: Win GUI message on Windows
// acl_fiber_create/acl_fiber_schedule_with are in `lib_fiber.h`.
// socket_listen/socket_accept/socket_close are in patch.c of the samples path.
int main(void)
{
int event_mode = FIBER_EVENT_KERNEL;
#if defined(_WIN32) || defined(_WIN64)
socket_init();
#endif
// create one fiber to accept connections
acl_fiber_create(fiber_accept, NULL, __stack_size);
// start the fiber schedule process
acl_fiber_schedule_with(event_mode);
#if defined(_WIN32) || defined(_WIN64)
socket_end();
#endif
return 0;
}
3.2、基于协程的客户端程序
// fiber_client.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "fiber/lib_fiber.h"
#include "patch.h" // in lib_fiber/samples/patch.h
static const char *__server_ip = "127.0.0.1";
static int __server_port = 9001;
// socket_init/socket_end/socket_connect/socket_close are in patch.c of the samples path
static void fiber_client(ACL_FIBER *fb, void *ctx)
{
SOCKET cfd = socket_connect(__server_ip, __server_port);
const char *s = "hello world\r\n";
char buf[8192];
int i, ret;
if (cfd == INVALID_SOCKET) {
return;
}
for (i = 0; i < 1024; i++) {
#if defined(_WIN32) || defined(_WIN64)
if (acl_fiber_send(cfd, s, strlen(s), 0) <= 0) {
#else
if (send(cfd, s, strlen(s), 0) <= 0) {
#endif
printf("send error %s\r\n", acl_fiber_last_serror());
break;
}
#if defined(_WIN32) || defined(_WIN64)
ret = acl_fiber_recv(cfd, buf, sizeof(buf), 0);
#else
ret = recv(cfd, buf, sizeof(buf), 0);
#endif
if (ret <= 0) {
break;
}
}
#if defined(_WIN32) || defined(_WIN64)
acl_fiber_close(cfd);
#else
close(cfd);
#endif
}
int main(void)
{
int event_mode = FIBER_EVENT_KERNEL;
size_t stack_size = 128000;
int i;
#if defined(_WIN32) || defined(_WIN64)
socket_init();
#endif
for (i = 0; i < 100; i++) {
acl_fiber_create(fiber_client, NULL, stack_size);
}
acl_fiber_schedule_with(event_mode);
#if defined(_WIN32) || defined(_WIN64)
socket_end();
#endif
return 0;
}
3.3、使用 acl 网络库例子
上面的例子中因为使用了系统原生的网络 API,所以感觉代码有些臃肿,下面的例子使用 acl 库中提供的网络 API,显得更为简单些:
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
class fiber_client : public acl::fiber
{
public:
fiber_client(acl::socket_stream* conn) : conn_(conn) {}
protected:
// @override
void run(void)
{
printf("fiber-%d-%d running\r\n", get_id(), acl::fiber::self());
char buf[8192];
while (true) {
int ret = conn_->read(buf, sizeof(buf), false);
if (ret == -1) {
break;
}
if (conn_->write(buf, ret) == -1) {
break;
}
}
delete conn_;
delete this;
}
private:
acl::socket_stream* conn_;
~fiber_client(void) {}
};
class fiber_server : public acl::fiber
{
public:
fiber_server(acl::server_socket& ss) : ss_(ss) {}
~fiber_server(void) {}
protected:
// @override
void run(void)
{
while (true) {
acl::socket_stream* conn = ss_.accept();
if (conn == NULL) {
printf("accept error %s\r\n", acl::last_serror());
break;
}
printf("accept ok, fd: %d\r\n", conn->sock_handle());
// create one fiber for one connection
fiber_client* fc = new fiber_client(conn);
// start the fiber
fc->start();
}
}
private:
acl::server_socket& ss_;
};
static void usage(const char* procname)
{
printf("usage: %s -h [help] -s listen_addr\r\n", procname);
}
int main(int argc, char *argv[])
{
int ch;
acl::acl_cpp_init();
acl::string addr("127.0.0.1:9006");
acl::log::stdout_open(true);
while ((ch = getopt(argc, argv, "hs:")) > 0) {
switch (ch) {
case 'h':
usage(argv[0]);
return 0;
case 's':
addr = optarg;
break;
default:
break;
}
}
acl::server_socket ss;
if (ss.open(addr) == false) {
printf("listen %s error %s\r\n", addr.c_str(), acl::last_serror());
return 1;
}
printf("listen %s ok\r\n", addr.c_str());
fiber_server fs(ss);
fs.start(); // start listen fiber
acl::fiber::schedule(); // start fiber schedule
return 0;
}
3.4、使用C++11示例
如果使用C++11的特性,则示上面例更为简单,如下:
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
static void fiber_client(acl::socket_stream* conn)
{
printf("fiber-%d running\r\n", acl::fiber::self());
char buf[8192];
while (true) {
int ret = conn->read(buf, sizeof(buf), false);
if (ret == -1) {
break;
}
if (conn->write(buf, ret) == -1) {
break;
}
}
delete conn;
}
static void fiber_server(acl::server_socket& ss)
{
while (true) {
acl::socket_stream* conn = ss.accept();
if (conn == NULL) {
printf("accept error %s\r\n", acl::last_serror());
break;
}
printf("accept ok, fd: %d\r\n", conn->sock_handle());
go[=] {
fiber_client(conn);
};
}
}
static void usage(const char* procname)
{
printf("usage: %s -h [help] -s listen_addr\r\n", procname);
}
int main(int argc, char *argv[])
{
int ch;
acl::acl_cpp_init();
acl::string addr("127.0.0.1:9006");
acl::log::stdout_open(true);
while ((ch = getopt(argc, argv, "hs:")) > 0) {
switch (ch) {
case 'h':
usage(argv[0]);
return 0;
case 's':
addr = optarg;
break;
default:
break;
}
}
acl::server_socket ss;
if (ss.open(addr) == false) {
printf("listen %s error %s\r\n", addr.c_str(), acl::last_serror());
return 1;
}
printf("listen %s ok\r\n", addr.c_str());
go[&] {
fiber_server(ss);
};
acl::fiber::schedule(); // start fiber schedule
return 0;
}
3.5、基于协程的 Windows 界面网络程序
在示例目录 下为基于协程的 Windows 界面网络程序,程序运行截屏如
该 Windows 界面程序包含网络服务器
和网络客户端
两个功能。在运行时,服务模块和客户端模块运行在 Windows 界面线程中,因为协程库使用了 Windows 界面消息泵,所以协程模块可以与界面上元素成为一体
而不必跨越线程,也不必使用令人烦恼的异步套接字 API。
3.6、更多例子
在 acl工程中,有更多的示例来描述网络协程编程,当然,这些例子还大量使用了 acl 库中的其它库的 API。
4、编译协程库
4.1、在 Unix 平台编译
$cd lib_fiber
$make
$cd samples
$make
则会在 lib_fiber/lib/
目录下生成 libfiber.a
和 libfiber_cpp.a
,分别对应着 C 和 C++ 版本的协程库,其中 libfiber_cpp.a
是用 C++ 对 libfiber.a
的二次封装。
下面给出了一个例子的 Makefile 内容:
fiber_server: fiber_server.c
gcc -o fiber_server fiber_server.c patch.c -I{path_of_fiber_header} -L{path_of_fiber_lib) -lfiber -ldl -lpthread
fiber_client: fiber_client.c
gcc -o fiber_client fiber_client.c patch.c -I{path_of_fiber_header} -L{path_of_fiber_lib) -lfiber -ldl -lpthread
如果编译并使用 acl 基础库和 libfiber_cpp.a,则需要注意库的依赖关系:
fiber_server: fiber_server.cpp
g++ -o fiber_server fiber_server.cpp -lfiber_cpp -lacl_cpp -lprotocol -lacl -lfiber
在该 Makefile 中,-lfiber_cpp 放到最前面,是因为其依赖于其它几个库,而 -lfiber 放在最后,是因为该库需要 hook 系统 IO 操作。
4.2、在 Windows 平台编译
目前可以使用 vc2012/vc2013/vc2015 分别打开 fiber_vc2012.sln /fiber_vc2013.sln/fiber_vc2015.sln 编译 libfiber 库。
5、性能测试
下面仅做了简单的 IOPS (网络 IO 性能)的测试,同时和其它协程库做了简单的对比:
其它的网络协程库有:libmill,golang 和 libco。其中,各个库的压测示例:
- 基于 libmill 和 libco 的压测用例在 目录 下;
- 基于 Golang 的压测用例在 目录中;
- 基于 libfiber 的压测用例:示例;
- 客户端压测程序:https://github.com/acl-dev/acl/tree/master/lib_fiber/samples/client2
6、API 列表
6.1、Base API
- acl_fiber_create
- acl_fiber_self
- acl_fiber_status
- acl_fiber_kill
- acl_fiber_killed
- acl_fiber_signal
- acl_fiber_yield
- acl_fiber_ready
- acl_fiber_switch
- acl_fiber_schedule_init
- acl_fiber_schedule
- acl_fiber_schedule_with
- acl_fiber_scheduled
- acl_fiber_schedule_stop
- acl_fiber_set_specific
- acl_fiber_get_specific
- acl_fiber_delay
- acl_fiber_last_error
- acl_fiber_last_serror
6.2、IO API
- acl_fiber_recv
- acl_fiber_recvfrom
- acl_fiber_read
- acl_fiber_readv
- acl_fiber_recvmsg
- acl_fiber_write
- acl_fiber_writev
- acl_fiber_send
- acl_fiber_sendto
- acl_fiber_sendmsg
- acl_fiber_select
- acl_fiber_poll
- acl_fiber_close
6.3、Net API
- acl_fiber_socket
- acl_fiber_listen
- acl_fiber_accept
- acl_fiber_connect
- acl_fiber_gethostbyname_r
- acl_fiber_getaddrinfo
- acl_fiber_freeaddrinfo
6.4、Channel API
- acl_channel_create
- acl_channel_free
- acl_channel_send
- acl_channel_send_nb
- acl_channel_recv
- acl_channel_recv_nb
- acl_channel_sendp
- acl_channel_recvp
- acl_channel_sendp_nb
- acl_channel_recvp_nb
- acl_channel_sendul
- acl_channel_recvul
- acl_channel_sendul_nb
- acl_channel_recvul_nb
6.5、Sync API
ACL_FIBER_MUTEX
- acl_fiber_mutex_create
- acl_fiber_mutex_free
- acl_fiber_mutex_lock
- acl_fiber_mutex_trylock
- acl_fiber_mutex_unlock
ACL_FIBER_RWLOCK
- acl_fiber_rwlock_create
- acl_fiber_rwlock_free
- acl_fiber_rwlock_rlock
- acl_fiber_rwlock_tryrlock
- acl_fiber_rwlock_wlock
- acl_fiber_rwlock_trywlock
- acl_fiber_rwlock_runlock
- acl_fiber_rwlock_wunlock
ACL_FIBER_EVENT
- acl_fiber_event_create
- acl_fiber_event_free
- acl_fiber_event_wait
- acl_fiber_event_trywait
- acl_fiber_event_notify
ACL_FIBER_SEM
- acl_fiber_sem_create
- acl_fiber_sem_free
- acl_fiber_sem_wait
- acl_fiber_sem_post
- acl_fiber_sem_num
6.6、关于 API Hook
在 Linux/MacOS/FreeBSD 平台上,很多与 IO 和网络相关的的系统 API 被 hook 了,因此,在编译连接时将 libfiber 加上,这样你的应用程序中仅需使用系统标准 IO API,便可以使你的网络程序自动协程化。下面是一些被 hook 的系统 API 列表:
- close
- sleep
- read
- readv
- recv
- recvfrom
- recvmsg
- write
- writev
- send
- sendto
- sendmsg
- sendfile64
- socket
- listen
- accept
- connect
- select
- poll
- epoll: epoll_create, epoll_ctl, epoll_wait
- gethostbyname(_r)
- getaddrinfo/freeaddrinfo
7、更多参考
- Acl网络协程框架编程指南: https://blog.csdn.net/zsxxsz/article/details/89007127
- 网络协程编程:https://blog.csdn.net/zsxxsz/article/details/88388457
- 编译使用 acl 协程库:https://blog.csdn.net/zsxxsz/article/details/88349466
- 使用协程方式编写高并发的 WEB 服务:https://blog.csdn.net/zsxxsz/article/details/88349460
- 使用 acl 协程编写高并发网络服务:https://blog.csdn.net/zsxxsz/article/details/88349459
- acl开发--协程篇:https://blog.csdn.net/zsxxsz/category_8736935.html