void
print_features (struct event_base *base)
{
const char *method=event_base_get_method(base);
printf ("--- method <%s> ---\n", method);
int cnt = event_base_get_features(base);
if (cnt & EV_FEATURE_ET) {
/* see man for more information about edge-triggered and level-triggered */
printf("support edge-triggered events with EV_ET\n");
}
if(cnt & EV_FEATURE_O1) {
/* poll and select is O(n) */
printf("having one event triggered among many is an O(1) operation.\n");
}
if(cnt & EV_FEATURE_FDS) {
/* epoll not support it */
printf("allows file descriptors as well as sockets. \n");
}
if (cnt & EV_FEATURE_EARLY_CLOSE) {
/* detect connection close without the necessity of reading all the pending data. */
printf ("EV_FEATURE_EARLY_CLOSE\n");
}
printf ("that is all\n\n");
}
CIOServer::CIOServer()
: m_evbase(event_base_new())
, m_status(status_null)
, m_binit(false)
, m_id(gen_ioserverid())
, m_curpost( 0 )
, m_haspostdata( false )
{
//static CNetInit netinit;
if ( !m_evbase )
{
XH_LOG_ERROR(::xhnet::logname_base, "Create EventBase Failed, Check OS config");
}
else
{
XH_LOG_DEBUG(::xhnet::logname_base, "Using LibEvent with backend method " << event_base_get_method(m_evbase));
// 设置m_evbase的优先级范围0-10
//event_base_priority_init(m_evbase, 10);
//event_priority_set 设置event的优先级
//event_base_get_npriorities // 2.1.1
#ifdef _DEBUG
int f = event_base_get_features(m_evbase);
if ((f & EV_FEATURE_ET))
XH_LOG_DEBUG(::xhnet::logname_base, " Edge-triggered events are supported.");
if ((f & EV_FEATURE_O1))
XH_LOG_DEBUG(::xhnet::logname_base, " O(1) event notification is supported.");
if ((f & EV_FEATURE_FDS))
XH_LOG_DEBUG(::xhnet::logname_base, " All FD types are supported.");
#endif
}
}
int main(int argc, char*argv[]) {
printf("Hello, world!\n");
event_config *conf = event_config_new();
#ifdef WIN32
WORD wVersionRequested;
WSADATA wsaData;
int err;
/* Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h */
wVersionRequested = MAKEWORD(2, 2);
err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
/* Tell the user that we could not find a usable */
/* Winsock DLL. */
printf("WSAStartup failed with error: %d\n", err);
return 1;
}
evthread_use_windows_threads();
event_config_set_flag(conf, EVENT_BASE_FLAG_STARTUP_IOCP);
#endif
base = event_base_new_with_config(conf);
const char ** methods = event_get_supported_methods();
int loop;
std::cout << "Version: " << event_get_version() << std::endl;
std::cout << "Method: " << event_base_get_method(base) << std::endl;
std::cout << "Features: 0x" << std::hex << event_base_get_features(base)
<< std::endl;
std::cout << "Base: " << base << std::endl;
while (*methods) {
std::cout << "Method: " << *methods++ << std::endl;
}
event_set_log_callback(_log_cb);
/* The caller has already set up fd1, fd2 somehow, and make them
nonblocking. */
if (0) {
evutil_socket_t fd1 = 1;
evutil_socket_t fd2 = 1;
struct timeval five_seconds = { 5, 0 };
struct event *ev1 = event_new(base, fd1,
EV_TIMEOUT | EV_READ/*|EV_PERSIST*/, cb_func,
(char*) "Reading event");
struct event *ev2 = event_new(base, fd2, EV_WRITE/*|EV_PERSIST*/, cb_func,
(char*) "Writing event");
event_add(ev1, &five_seconds);
event_add(ev2, NULL);
std::cout << "\nEntering loop" << std::endl;
loop = event_base_loop(base, 0);
std::cout << "Exiting loop: " << loop << std::endl;
}
// http server
evhttp *ev_http = evhttp_new(base);
int http_port = 9090;
// evhttp_bind_socket expects its PORT param in host byte order. Sigh.
int r = evhttp_bind_socket(ev_http, "0.0.0.0", http_port);
// This return value is undocumented (!), but this seems to work.
if (r == -1) {
std::cerr << "could not open port " << http_port << std::endl;
return 3;
}
evhttp_set_gencb(ev_http, http_handle_generic, 0);
//evhttp_set_cb(ev_http, "/", http_handle_root);
std::cout << "\nEntering loop" << std::endl;
loop = event_base_loop(base, 0);
std::cout << "Exiting loop: " << loop << std::endl;
evhttp_free(ev_http);
event_base_free(base);
event_config_free(conf);
return 0;
}
