X-Git-Url: http://xvm.mit.edu/gitweb/invirt/third/libt4.git/blobdiff_plain/f2170465073de34adf89161d4287182b518352c4..2546a41ad36fdc9ef6471cb35a1d56930ae1b527:/paxos.cc

diff --git a/paxos.cc b/paxos.cc
index 83bf4f1..46d9c1c 100644
--- a/paxos.cc
+++ b/paxos.cc
@@ -1,10 +1,11 @@
 #include "paxos.h"
 #include "handle.h"
-#include <stdio.h>
-#include "tprintf.h"
+#include "threaded_log.h"
 #include "lang/verify.h"
 #include "lock.h"
 
+using std::stoi;
+
 // This module implements the proposer and acceptor of the Paxos
 // distributed algorithm as described by Lamport's "Paxos Made
 // Simple".  To kick off an instance of Paxos, the caller supplies a
@@ -22,9 +23,9 @@ bool operator>= (const prop_t &a, const prop_t &b) {
     return (a.n > b.n || (a.n == b.n && a.m >= b.m));
 }
 
-std::string
-print_members(const std::vector<std::string> &nodes) {
-    std::string s;
+string
+print_members(const vector<string> &nodes) {
+    string s;
     s.clear();
     for (unsigned i = 0; i < nodes.size(); i++) {
         s += nodes[i];
@@ -35,7 +36,7 @@ print_members(const std::vector<std::string> &nodes) {
 }
 
 
-bool isamember(const std::string & m, const std::vector<std::string> & nodes) {
+bool isamember(const string & m, const vector<string> & nodes) {
     for (auto n : nodes) {
         if (n == m)
             return 1;
@@ -51,8 +52,7 @@ bool proposer::isrunning() {
 }
 
 // check if the servers in l2 contains a majority of servers in l1
-bool proposer::majority(const std::vector<std::string> &l1,
-		const std::vector<std::string> &l2) {
+bool proposer::majority(const vector<string> &l1, const vector<string> &l2) {
     unsigned n = 0;
 
     for (unsigned i = 0; i < l1.size(); i++) {
@@ -62,8 +62,7 @@ bool proposer::majority(const std::vector<std::string> &l1,
     return n >= (l1.size() >> 1) + 1;
 }
 
-proposer::proposer(class paxos_change *_cfg, class acceptor *_acceptor,
-        const std::string &_me)
+proposer::proposer(class paxos_change *_cfg, class acceptor *_acceptor, const string &_me)
   : cfg(_cfg), acc (_acceptor), me (_me), break1 (false), break2 (false),
     stable (true)
 {
@@ -76,19 +75,17 @@ void proposer::setn()
     my_n.n = acc->get_n_h().n + 1 > my_n.n + 1 ? acc->get_n_h().n + 1 : my_n.n + 1;
 }
 
-bool proposer::run(unsigned instance, const std::vector<std::string> & cur_nodes,
-        const std::string & newv)
+bool proposer::run(unsigned instance, const vector<string> & cur_nodes, const string & newv)
 {
-    std::vector<std::string> accepts;
-    std::vector<std::string> nodes;
-    std::string v;
+    vector<string> accepts;
+    vector<string> nodes;
+    string v;
     bool r = false;
 
     lock ml(pxs_mutex);
-    tprintf("start: initiate paxos for %s w. i=%d v=%s stable=%d\n",
-            print_members(cur_nodes).c_str(), instance, newv.c_str(), stable);
+    LOG("start: initiate paxos for " << print_members(cur_nodes) << " w. i=" << instance << " v=" << newv << " stable=" << stable);
     if (!stable) {  // already running proposer?
-        tprintf("proposer::run: already running\n");
+        LOG("proposer::run: already running");
         return false;
     }
     stable = false;
@@ -98,7 +95,7 @@ bool proposer::run(unsigned instance, const std::vector<std::string> & cur_nodes
     if (prepare(instance, accepts, cur_nodes, v)) {
 
         if (majority(cur_nodes, accepts)) {
-            tprintf("paxos::manager: received a majority of prepare responses\n");
+            LOG("paxos::manager: received a majority of prepare responses");
 
             if (v.size() == 0)
                 v = newv;
@@ -110,20 +107,20 @@ bool proposer::run(unsigned instance, const std::vector<std::string> & cur_nodes
             accept(instance, accepts, nodes, v);
 
             if (majority(cur_nodes, accepts)) {
-                tprintf("paxos::manager: received a majority of accept responses\n");
+                LOG("paxos::manager: received a majority of accept responses");
 
                 breakpoint2();
 
                 decide(instance, accepts, v);
                 r = true;
             } else {
-                tprintf("paxos::manager: no majority of accept responses\n");
+                LOG("paxos::manager: no majority of accept responses");
             }
         } else {
-            tprintf("paxos::manager: no majority of prepare responses\n");
+            LOG("paxos::manager: no majority of prepare responses");
         }
     } else {
-        tprintf("paxos::manager: prepare is rejected %d\n", stable);
+        LOG("paxos::manager: prepare is rejected " << stable);
     }
     stable = true;
     return r;
@@ -135,9 +132,9 @@ bool proposer::run(unsigned instance, const std::vector<std::string> & cur_nodes
 // otherwise fill in accepts with set of nodes that accepted,
 // set v to the v_a with the highest n_a, and return true.
 bool
-proposer::prepare(unsigned instance, std::vector<std::string> & accepts,
-        const std::vector<std::string> & nodes,
-        std::string & v)
+proposer::prepare(unsigned instance, vector<string> & accepts,
+        const vector<string> & nodes,
+        string & v)
 {
     struct paxos_protocol::preparearg arg = { instance, my_n };
     struct paxos_protocol::prepareres res;
@@ -150,14 +147,14 @@ proposer::prepare(unsigned instance, std::vector<std::string> & accepts,
         int status = r->call_timeout(paxos_protocol::preparereq, rpcc::to(1000), res, me, arg);
         if (status == paxos_protocol::OK) {
             if (res.oldinstance) {
-                tprintf("commiting old instance!\n");
+                LOG("commiting old instance!");
                 acc->commit(instance, res.v_a);
                 return false;
             }
             if (res.accept) {
                 accepts.push_back(i);
                 if (res.n_a >= n_a) {
-                    tprintf("found a newer accepted proposal\n");
+                    LOG("found a newer accepted proposal");
                     v = res.v_a;
                     n_a = res.n_a;
                 }
@@ -170,8 +167,8 @@ proposer::prepare(unsigned instance, std::vector<std::string> & accepts,
 // run() calls this to send out accept RPCs to accepts.
 // fill in accepts with list of nodes that accepted.
 void
-proposer::accept(unsigned instance, std::vector<std::string> & accepts,
-        const std::vector<std::string> & nodes, const std::string & v)
+proposer::accept(unsigned instance, vector<string> & accepts,
+        const vector<string> & nodes, const string & v)
 {
     struct paxos_protocol::acceptarg arg = { instance, my_n, v };
     rpcc *r;
@@ -187,8 +184,8 @@ proposer::accept(unsigned instance, std::vector<std::string> & accepts,
 }
 
 void
-proposer::decide(unsigned instance, const std::vector<std::string> & accepts,
-        const std::string & v)
+proposer::decide(unsigned instance, const vector<string> & accepts,
+        const string & v)
 {
     struct paxos_protocol::decidearg arg = { instance, v };
     rpcc *r;
@@ -201,8 +198,8 @@ proposer::decide(unsigned instance, const std::vector<std::string> & accepts,
     }
 }
 
-acceptor::acceptor(class paxos_change *_cfg, bool _first, const std::string & _me,
-        const std::string & _value)
+acceptor::acceptor(class paxos_change *_cfg, bool _first, const string & _me,
+        const string & _value)
   : cfg(_cfg), me (_me), instance_h(0)
 {
     n_h.n = 0;
@@ -219,14 +216,14 @@ acceptor::acceptor(class paxos_change *_cfg, bool _first, const std::string & _m
         instance_h = 1;
     }
 
-    pxs = new rpcs((uint32_t)std::stoi(_me));
+    pxs = new rpcs((uint32_t)stoi(_me));
     pxs->reg(paxos_protocol::preparereq, &acceptor::preparereq, this);
     pxs->reg(paxos_protocol::acceptreq, &acceptor::acceptreq, this);
     pxs->reg(paxos_protocol::decidereq, &acceptor::decidereq, this);
 }
 
 paxos_protocol::status
-acceptor::preparereq(paxos_protocol::prepareres & r, const std::string &,
+acceptor::preparereq(paxos_protocol::prepareres & r, const string &,
         paxos_protocol::preparearg a)
 {
     lock ml(pxs_mutex);
@@ -242,13 +239,13 @@ acceptor::preparereq(paxos_protocol::prepareres & r, const std::string &,
         l->logprop(n_h);
         r.accept = true;
     } else {
-        tprintf("I totally rejected this request.  Ha.\n");
+        LOG("I totally rejected this request.  Ha.");
     }
     return paxos_protocol::OK;
 }
 
 paxos_protocol::status
-acceptor::acceptreq(bool & r, const std::string &, paxos_protocol::acceptarg a)
+acceptor::acceptreq(bool & r, const string &, paxos_protocol::acceptarg a)
 {
     lock ml(pxs_mutex);
     r = false;
@@ -263,11 +260,10 @@ acceptor::acceptreq(bool & r, const std::string &, paxos_protocol::acceptarg a)
 
 // the src argument is only for debugging
 paxos_protocol::status
-acceptor::decidereq(int &, const std::string &, paxos_protocol::decidearg a)
+acceptor::decidereq(int &, const string &, paxos_protocol::decidearg a)
 {
     lock ml(pxs_mutex);
-    tprintf("decidereq for accepted instance %d (my instance %d) v=%s\n",
-            a.instance, instance_h, v_a.c_str());
+    LOG("decidereq for accepted instance " << a.instance << " (my instance " << instance_h << ") v=" << v_a);
     if (a.instance == instance_h + 1) {
         VERIFY(v_a == a.v);
         commit(a.instance, v_a, ml);
@@ -281,11 +277,11 @@ acceptor::decidereq(int &, const std::string &, paxos_protocol::decidearg a)
 }
 
 void
-acceptor::commit(unsigned instance, const std::string & value, lock & pxs_mutex_lock)
+acceptor::commit(unsigned instance, const string & value, lock & pxs_mutex_lock)
 {
-    tprintf("acceptor::commit: instance=%d has v= %s\n", instance, value.c_str());
+    LOG("acceptor::commit: instance=" << instance << " has v=" << value);
     if (instance > instance_h) {
-        tprintf("commit: highestaccepteinstance = %d\n", instance);
+        LOG("commit: highestaccepteinstance = " << instance);
         values[instance] = value;
         l->loginstance(instance, value);
         instance_h = instance;
@@ -303,20 +299,20 @@ acceptor::commit(unsigned instance, const std::string & value, lock & pxs_mutex_
 }
 
 void
-acceptor::commit(unsigned instance, const std::string & value)
+acceptor::commit(unsigned instance, const string & value)
 {
     lock ml(pxs_mutex);
     commit(instance, value, ml);
 }
 
-std::string
+string
 acceptor::dump()
 {
     return l->dump();
 }
 
 void
-acceptor::restore(const std::string & s)
+acceptor::restore(const string & s)
 {
     l->restore(s);
     l->logread();
@@ -331,7 +327,7 @@ void
 proposer::breakpoint1()
 {
     if (break1) {
-        tprintf("Dying at breakpoint 1!\n");
+        LOG("Dying at breakpoint 1!");
         exit(1);
     }
 }
@@ -341,7 +337,7 @@ void
 proposer::breakpoint2()
 {
     if (break2) {
-        tprintf("Dying at breakpoint 2!\n");
+        LOG("Dying at breakpoint 2!");
         exit(1);
     }
 }
@@ -350,10 +346,10 @@ void
 proposer::breakpoint(int b)
 {
     if (b == 3) {
-        tprintf("Proposer: breakpoint 1\n");
+        LOG("Proposer: breakpoint 1");
         break1 = true;
     } else if (b == 4) {
-        tprintf("Proposer: breakpoint 2\n");
+        LOG("Proposer: breakpoint 2");
         break2 = true;
     }
 }