X-Git-Url: http://xvm.mit.edu/gitweb/invirt/third/libt4.git/blobdiff_plain/26ade07ab0e62b98b452fbbd18edba0450035e35..c279db4240a3a3c30f069ab9dea8055cf94280da:/rpc/connection.cc

diff --git a/rpc/connection.cc b/rpc/connection.cc
index d118539..8966cc2 100644
--- a/rpc/connection.cc
+++ b/rpc/connection.cc
@@ -15,7 +15,7 @@ connection::connection(connection_delegate * delegate, socket_t && f1, int l1)
 
     signal(SIGPIPE, SIG_IGN);
 
-    poll_mgr::shared_mgr.add_callback(fd, CB_RDONLY, this);
+    global->shared_mgr.add_callback(fd, CB_RDONLY, this);
 }
 
 connection::~connection() {
@@ -28,9 +28,9 @@ connection::~connection() {
     }
     // after block_remove_fd, select will never wait on fd and no callbacks
     // will be active
-    poll_mgr::shared_mgr.block_remove_fd(fd);
+    global->shared_mgr.block_remove_fd(fd);
     VERIFY(dead_);
-    VERIFY(!wpdu_.buf.size());
+    VERIFY(wpdu_.status == unused);
 }
 
 shared_ptr<connection> connection::to_dst(const sockaddr_in & dst, connection_delegate * delegate, int lossy) {
@@ -42,46 +42,39 @@ shared_ptr<connection> connection::to_dst(const sockaddr_in & dst, connection_de
         return nullptr;
     }
     IF_LEVEL(2) LOG_NONMEMBER << "connection::to_dst fd=" << s << " to dst " << inet_ntoa(dst.sin_addr) << ":" << ntoh(dst.sin_port);
-    return make_shared<connection>(delegate, std::move(s), lossy);
+    return std::make_shared<connection>(delegate, std::move(s), lossy);
 }
 
 bool connection::send(const string & b) {
     lock ml(m_);
 
-    waiters_++;
-    while (!dead_ && wpdu_.buf.size())
+    while (!dead_ && wpdu_.status != unused)
         send_wait_.wait(ml);
-    waiters_--;
 
     if (dead_)
         return false;
 
-    wpdu_.buf = b;
-    wpdu_.solong = 0;
+    wpdu_ = {inflight, b, 0};
 
-    if (lossy_) {
-        if ((random()%100) < lossy_) {
-            IF_LEVEL(1) LOG << "send LOSSY TEST shutdown fd " << fd;
-            shutdown(fd,SHUT_RDWR);
-        }
+    if (std::bernoulli_distribution(lossy_*.01)(global->random_generator)) {
+        IF_LEVEL(1) LOG << "send LOSSY TEST shutdown fd " << fd;
+        shutdown(fd,SHUT_RDWR);
     }
 
     if (!writepdu()) {
         dead_ = true;
         ml.unlock();
-        poll_mgr::shared_mgr.block_remove_fd(fd);
+        global->shared_mgr.block_remove_fd(fd);
         ml.lock();
-    } else if (wpdu_.solong != wpdu_.buf.size()) {
+    } else if (wpdu_.status == inflight && wpdu_.cursor < b.size()) {
         // should be rare to need to explicitly add write callback
-        poll_mgr::shared_mgr.add_callback(fd, CB_WRONLY, this);
-        while (!dead_ && wpdu_.solong != size_t_max && wpdu_.solong < wpdu_.buf.size())
+        global->shared_mgr.add_callback(fd, CB_WRONLY, this);
+        while (!dead_ && wpdu_.status == inflight && wpdu_.cursor < b.size())
             send_complete_.wait(ml);
     }
-    bool ret = (!dead_ && wpdu_.solong == wpdu_.buf.size());
-    wpdu_.solong = 0;
-    wpdu_.buf.clear();
-    if (waiters_ > 0)
-        send_wait_.notify_all();
+    bool ret = (!dead_ && wpdu_.status == inflight && wpdu_.cursor == b.size());
+    wpdu_ = {unused, "", 0};
+    send_wait_.notify_all();
     return ret;
 }
 
@@ -90,22 +83,38 @@ void connection::write_cb(int s) {
     lock ml(m_);
     VERIFY(!dead_);
     VERIFY(fd == s);
-    if (wpdu_.buf.size() == 0) {
-        poll_mgr::shared_mgr.del_callback(fd, CB_WRONLY);
+    if (wpdu_.status != inflight) {
+        global->shared_mgr.del_callback(fd, CB_WRONLY);
         return;
     }
     if (!writepdu()) {
-        poll_mgr::shared_mgr.del_callback(fd, CB_RDWR);
+        global->shared_mgr.del_callback(fd, CB_RDWR);
         dead_ = true;
     } else {
-        VERIFY(wpdu_.solong != size_t_max);
-        if (wpdu_.solong < wpdu_.buf.size()) {
+        VERIFY(wpdu_.status != error);
+        if (wpdu_.cursor < wpdu_.buf.size())
             return;
-        }
     }
     send_complete_.notify_one();
 }
 
+bool connection::writepdu() {
+    VERIFY(wpdu_.status == inflight);
+    if (wpdu_.cursor == wpdu_.buf.size())
+        return true;
+
+    ssize_t n = write(fd, &wpdu_.buf[wpdu_.cursor], (wpdu_.buf.size()-wpdu_.cursor));
+    if (n < 0) {
+        if (errno != EAGAIN) {
+            IF_LEVEL(1) LOG << "writepdu fd " << fd << " failure errno=" << errno;
+            wpdu_ = {error, "", 0};
+        }
+        return (errno == EAGAIN);
+    }
+    wpdu_.cursor += (size_t)n;
+    return true;
+}
+
 // fd is ready to be read
 void connection::read_cb(int s) {
     lock ml(m_);
@@ -115,45 +124,26 @@ void connection::read_cb(int s) {
 
     IF_LEVEL(5) LOG << "got data on fd " << s;
 
-    if (!rpdu_.buf.size() || rpdu_.solong < rpdu_.buf.size()) {
+    if (rpdu_.status == unused || rpdu_.cursor < rpdu_.buf.size()) {
         if (!readpdu()) {
             IF_LEVEL(5) LOG << "readpdu on fd " << s << " failed; dying";
-            poll_mgr::shared_mgr.del_callback(fd, CB_RDWR);
+            global->shared_mgr.del_callback(fd, CB_RDWR);
             dead_ = true;
             send_complete_.notify_one();
         }
     }
 
-    if (rpdu_.buf.size() && rpdu_.buf.size() == rpdu_.solong) {
+    if (rpdu_.status == inflight && rpdu_.buf.size() == rpdu_.cursor) {
         if (delegate_->got_pdu(shared_from_this(), rpdu_.buf)) {
             // connection_delegate has successfully consumed the pdu
-            rpdu_.buf.clear();
-            rpdu_.solong = 0;
+            rpdu_ = {unused, "", 0};
         }
     }
 }
 
-bool connection::writepdu() {
-    VERIFY(wpdu_.solong != size_t_max);
-    if (wpdu_.solong == wpdu_.buf.size())
-        return true;
-
-    ssize_t n = write(fd, &wpdu_.buf[wpdu_.solong], (wpdu_.buf.size()-wpdu_.solong));
-    if (n < 0) {
-        if (errno != EAGAIN) {
-            IF_LEVEL(1) LOG << "writepdu fd " << fd << " failure errno=" << errno;
-            wpdu_.solong = size_t_max;
-            wpdu_.buf.clear();
-        }
-        return (errno == EAGAIN);
-    }
-    wpdu_.solong += (size_t)n;
-    return true;
-}
-
 bool connection::readpdu() {
     IF_LEVEL(5) LOG << "the receive buffer has length " << rpdu_.buf.size();
-    if (!rpdu_.buf.size()) {
+    if (rpdu_.status == unused) {
         rpc_protocol::rpc_sz_t sz1;
         ssize_t n = fd.read(sz1);
 
@@ -179,22 +169,20 @@ bool connection::readpdu() {
 
         IF_LEVEL(5) LOG << "read size of datagram = " << sz;
 
-        rpdu_.buf.assign(sz+sizeof(sz1), 0);
-        rpdu_.solong = sizeof(sz1);
+        rpdu_ = {inflight, string(sz+sizeof(sz1), 0), sizeof(sz1)};
     }
 
-    ssize_t n = fd.read(&rpdu_.buf[rpdu_.solong], rpdu_.buf.size() - rpdu_.solong);
+    ssize_t n = fd.read(&rpdu_.buf[rpdu_.cursor], rpdu_.buf.size() - rpdu_.cursor);
 
     IF_LEVEL(5) LOG << "read " << n << " bytes";
 
     if (n <= 0) {
         if (errno == EAGAIN)
             return true;
-        rpdu_.buf.clear();
-        rpdu_.solong = 0;
+        rpdu_ = {unused, "", 0};
         return false;
     }
-    rpdu_.solong += (size_t)n;
+    rpdu_.cursor += (size_t)n;
     return true;
 }
 
@@ -226,11 +214,11 @@ connection_listener::connection_listener(connection_delegate * delegate, in_port
 
     IF_LEVEL(2) LOG << "listen on " << port_ << " " << sin.sin_port;
 
-    poll_mgr::shared_mgr.add_callback(tcp_, CB_RDONLY, this);
+    global->shared_mgr.add_callback(tcp_, CB_RDONLY, this);
 }
 
 connection_listener::~connection_listener() {
-    poll_mgr::shared_mgr.block_remove_fd(tcp_);
+    global->shared_mgr.block_remove_fd(tcp_);
 }
 
 void connection_listener::read_cb(int) {
@@ -239,11 +227,10 @@ void connection_listener::read_cb(int) {
     int s1 = accept(tcp_, (sockaddr *)&sin, &slen);
     if (s1 < 0) {
         perror("connection_listener::accept_conn error");
-        throw runtime_error("connection listener failure");
+        throw std::runtime_error("connection listener failure");
     }
 
     IF_LEVEL(2) LOG << "accept_loop got connection fd=" << s1 << " " << inet_ntoa(sin.sin_addr) << ":" << ntoh(sin.sin_port);
-    auto ch = make_shared<connection>(delegate_, s1, lossy_);
 
     // garbage collect dead connections
     for (auto i = conns_.begin(); i != conns_.end();) {
@@ -253,5 +240,5 @@ void connection_listener::read_cb(int) {
             ++i;
     }
 
-    conns_[s1] = ch;
+    conns_[s1] = std::make_shared<connection>(delegate_, s1, lossy_);
 }