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Merge #14336: net: implement poll

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4927bf2f25 Increase maxconnections limit when using poll. (Patrick Strateman)
11cc491a28 Implement poll() on systems which support it properly. (Patrick Strateman)
28211a4bc9 Move SocketEvents logic to private method. (Patrick Strateman)
7e403c0ae7 Move GenerateSelectSet logic to private method. (Patrick Strateman)
1e6afd0dbc Introduce and use constant SELECT_TIMEOUT_MILLISECONDS. (Patrick Strateman)

Pull request description:

  Implement poll() on systems which support it properly.

  This eliminates the restriction on maximum socket descriptor number.

Tree-SHA512: b945cd9294afdafcce96d547f67679d5cdd684cf257904a239cd1248de3b5e093b8d6d28d8d1b7cc923dc0b2b5723faef9bc9bf118a9ce1bdcf357c2323f5573
This commit is contained in:
Wladimir J. van der Laan
2019-01-02 13:04:39 +01:00
parent 3ec4cc0a9e 4927bf2f25
commit 62cf608e93
5 changed files with 172 additions and 43 deletions
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176
src/net.cpp
View File

@@ -26,6 +26,10 @@
#include <fcntl.h>
#endif
#ifdef USE_POLL
#include <poll.h>
#endif
#ifdef USE_UPNP
#include <miniupnpc/miniupnpc.h>
#include <miniupnpc/miniwget.h>
@@ -33,6 +37,7 @@
#include <miniupnpc/upnperrors.h>
#endif
#include <unordered_map>
#include <math.h>
@@ -71,6 +76,10 @@ enum BindFlags {
BF_WHITELIST = (1U << 2),
};
// The set of sockets cannot be modified while waiting
// The sleep time needs to be small to avoid new sockets stalling
static const uint64_t SELECT_TIMEOUT_MILLISECONDS = 50;
const static std::string NET_MESSAGE_COMMAND_OTHER = "*other*";
static const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL; // SHA256("netgroup")[0:8]
@@ -1258,28 +1267,10 @@ void CConnman::InactivityCheck(CNode *pnode)
}
}
void CConnman::SocketHandler()
bool CConnman::GenerateSelectSet(std::set<SOCKET> &recv_set, std::set<SOCKET> &send_set, std::set<SOCKET> &error_set)
{
//
// Find which sockets have data to receive
//
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 50000; // frequency to poll pnode->vSend
fd_set fdsetRecv;
fd_set fdsetSend;
fd_set fdsetError;
FD_ZERO(&fdsetRecv);
FD_ZERO(&fdsetSend);
FD_ZERO(&fdsetError);
SOCKET hSocketMax = 0;
bool have_fds = false;
for (const ListenSocket& hListenSocket : vhListenSocket) {
FD_SET(hListenSocket.socket, &fdsetRecv);
hSocketMax = std::max(hSocketMax, hListenSocket.socket);
have_fds = true;
recv_set.insert(hListenSocket.socket);
}
{
@@ -1308,46 +1299,151 @@ void CConnman::SocketHandler()
if (pnode->hSocket == INVALID_SOCKET)
continue;
FD_SET(pnode->hSocket, &fdsetError);
hSocketMax = std::max(hSocketMax, pnode->hSocket);
have_fds = true;
error_set.insert(pnode->hSocket);
if (select_send) {
FD_SET(pnode->hSocket, &fdsetSend);
send_set.insert(pnode->hSocket);
continue;
}
if (select_recv) {
FD_SET(pnode->hSocket, &fdsetRecv);
recv_set.insert(pnode->hSocket);
}
}
}
int nSelect = select(have_fds ? hSocketMax + 1 : 0,
&fdsetRecv, &fdsetSend, &fdsetError, &timeout);
return !recv_set.empty() || !send_set.empty() || !error_set.empty();
}
#ifdef USE_POLL
void CConnman::SocketEvents(std::set<SOCKET> &recv_set, std::set<SOCKET> &send_set, std::set<SOCKET> &error_set)
{
std::set<SOCKET> recv_select_set, send_select_set, error_select_set;
if (!GenerateSelectSet(recv_select_set, send_select_set, error_select_set)) {
interruptNet.sleep_for(std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS));
return;
}
std::unordered_map<SOCKET, struct pollfd> pollfds;
for (SOCKET socket_id : recv_select_set) {
pollfds[socket_id].fd = socket_id;
pollfds[socket_id].events |= POLLIN;
}
for (SOCKET socket_id : send_select_set) {
pollfds[socket_id].fd = socket_id;
pollfds[socket_id].events |= POLLOUT;
}
for (SOCKET socket_id : error_select_set) {
pollfds[socket_id].fd = socket_id;
// These flags are ignored, but we set them for clarity
pollfds[socket_id].events |= POLLERR|POLLHUP;
}
std::vector<struct pollfd> vpollfds;
vpollfds.reserve(pollfds.size());
for (auto it : pollfds) {
vpollfds.push_back(std::move(it.second));
}
if (poll(vpollfds.data(), vpollfds.size(), SELECT_TIMEOUT_MILLISECONDS) < 0) return;
if (interruptNet) return;
for (struct pollfd pollfd_entry : vpollfds) {
if (pollfd_entry.revents & POLLIN) recv_set.insert(pollfd_entry.fd);
if (pollfd_entry.revents & POLLOUT) send_set.insert(pollfd_entry.fd);
if (pollfd_entry.revents & (POLLERR|POLLHUP)) error_set.insert(pollfd_entry.fd);
}
}
#else
void CConnman::SocketEvents(std::set<SOCKET> &recv_set, std::set<SOCKET> &send_set, std::set<SOCKET> &error_set)
{
std::set<SOCKET> recv_select_set, send_select_set, error_select_set;
if (!GenerateSelectSet(recv_select_set, send_select_set, error_select_set)) {
interruptNet.sleep_for(std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS));
return;
}
//
// Find which sockets have data to receive
//
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = SELECT_TIMEOUT_MILLISECONDS * 1000; // frequency to poll pnode->vSend
fd_set fdsetRecv;
fd_set fdsetSend;
fd_set fdsetError;
FD_ZERO(&fdsetRecv);
FD_ZERO(&fdsetSend);
FD_ZERO(&fdsetError);
SOCKET hSocketMax = 0;
for (SOCKET hSocket : recv_select_set) {
FD_SET(hSocket, &fdsetRecv);
hSocketMax = std::max(hSocketMax, hSocket);
}
for (SOCKET hSocket : send_select_set) {
FD_SET(hSocket, &fdsetSend);
hSocketMax = std::max(hSocketMax, hSocket);
}
for (SOCKET hSocket : error_select_set) {
FD_SET(hSocket, &fdsetError);
hSocketMax = std::max(hSocketMax, hSocket);
}
int nSelect = select(hSocketMax + 1, &fdsetRecv, &fdsetSend, &fdsetError, &timeout);
if (interruptNet)
return;
if (nSelect == SOCKET_ERROR)
{
if (have_fds)
{
int nErr = WSAGetLastError();
LogPrintf("socket select error %s\n", NetworkErrorString(nErr));
for (unsigned int i = 0; i <= hSocketMax; i++)
FD_SET(i, &fdsetRecv);
}
int nErr = WSAGetLastError();
LogPrintf("socket select error %s\n", NetworkErrorString(nErr));
for (unsigned int i = 0; i <= hSocketMax; i++)
FD_SET(i, &fdsetRecv);
FD_ZERO(&fdsetSend);
FD_ZERO(&fdsetError);
if (!interruptNet.sleep_for(std::chrono::milliseconds(timeout.tv_usec/1000)))
if (!interruptNet.sleep_for(std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS)))
return;
}
for (SOCKET hSocket : recv_select_set) {
if (FD_ISSET(hSocket, &fdsetRecv)) {
recv_set.insert(hSocket);
}
}
for (SOCKET hSocket : send_select_set) {
if (FD_ISSET(hSocket, &fdsetSend)) {
send_set.insert(hSocket);
}
}
for (SOCKET hSocket : error_select_set) {
if (FD_ISSET(hSocket, &fdsetError)) {
error_set.insert(hSocket);
}
}
}
#endif
void CConnman::SocketHandler()
{
std::set<SOCKET> recv_set, send_set, error_set;
SocketEvents(recv_set, send_set, error_set);
if (interruptNet) return;
//
// Accept new connections
//
for (const ListenSocket& hListenSocket : vhListenSocket)
{
if (hListenSocket.socket != INVALID_SOCKET && FD_ISSET(hListenSocket.socket, &fdsetRecv))
if (hListenSocket.socket != INVALID_SOCKET && recv_set.count(hListenSocket.socket) > 0)
{
AcceptConnection(hListenSocket);
}
@@ -1378,9 +1474,9 @@ void CConnman::SocketHandler()
LOCK(pnode->cs_hSocket);
if (pnode->hSocket == INVALID_SOCKET)
continue;
recvSet = FD_ISSET(pnode->hSocket, &fdsetRecv);
sendSet = FD_ISSET(pnode->hSocket, &fdsetSend);
errorSet = FD_ISSET(pnode->hSocket, &fdsetError);
recvSet = recv_set.count(pnode->hSocket) > 0;
sendSet = send_set.count(pnode->hSocket) > 0;
errorSet = error_set.count(pnode->hSocket) > 0;
}
if (recvSet || errorSet)
{