這是6.0之前的poll模型。
solaris\native\sun\nio\ch\SocketChannelImpl.c
JNIEXPORT?jint?JNICALL
Java_sun_nio_ch_SocketChannelImpl_checkConnect(JNIEnv?*env,?jobject?this,
???????????????????????????jobject?fdo,?jboolean?block,
???????????????????????????????????????????????jboolean?ready)
{
????int?error?=?0;
????int?n?=?sizeof(int);
????jint?fd?=?fdval(env,?fdo);
????int?result?=?0;
????struct?pollfd?poller;
????poller.revents?=?1;
????if?(!ready)?{
????????poller.fd?=?fd;
????????poller.events?=?POLLOUT;
????????poller.revents?=?0;
????????result?=?poll(&poller,?1,?block???-1?:?0);
????????if?(result?<?0)?{
????????????JNU_ThrowIOExceptionWithLastError(env,?"Poll?failed");
????????????return?IOS_THROWN;
????????}
????if?(!block?&&?(result?==?0))
????????return?IOS_UNAVAILABLE;
????}
????if?(poller.revents)?{
????????errno?=?0;
????????result?=?getsockopt(fd,?SOL_SOCKET,?SO_ERROR,?&error,?&n);
????????if?(result?<?0)?{
????????????handleSocketError(env,?errno);
????????????return?JNI_FALSE;
????????}?else?if?(error)?{
????????????handleSocketError(env,?error);
????????????return?JNI_FALSE;
????????}
????????return?1;
????}
????return?0;
}
6.0缺省的模型是使用epoll
E:\Java\jdk-6-rc-src\j2se\src\solaris\native\sun\nio\ch\EPollArrayWrapper.c
JNIEXPORT?void?JNICALL
Java_sun_nio_ch_EPollArrayWrapper_init(JNIEnv?*env,?jclass?this)?
{
????epoll_create_func?=?(epoll_create_t)?dlsym(RTLD_DEFAULT,?"epoll_create");
????epoll_ctl_func????=?(epoll_ctl_t)????dlsym(RTLD_DEFAULT,?"epoll_ctl");
????epoll_wait_func???=?(epoll_wait_t)???dlsym(RTLD_DEFAULT,?"epoll_wait");
???????????????????????????????????????????????????????????????????????????????????????????????????
????if?((epoll_create_func?==?NULL)?||?(epoll_ctl_func?==?NULL)?||
????????(epoll_wait_func?==?NULL))?{
????????JNU_ThrowInternalError(env,?"unable?to?get?address?of?epoll?functions,?pre-2.6?kernel?");
????}
}
具體程序的流程我還是不夠清楚，還有待進一步深入了解。