diff --git a/.gitignore b/.gitignore index 68731bdd..e0d983d0 100644 --- a/.gitignore +++ b/.gitignore @@ -395,4 +395,8 @@ test/files/**/*.txt *.old .metals/ -.scala-build/ \ No newline at end of file +.scala-build/ + +/.tools/ +_apalache-out/ +states/ \ No newline at end of file diff --git a/systems/locksvc/go.mod b/systems/locksvc/go.mod index c268e4ec..6ea4a282 100644 --- a/systems/locksvc/go.mod +++ b/systems/locksvc/go.mod @@ -4,13 +4,31 @@ go 1.18 replace github.com/UBC-NSS/pgo/distsys => ../../distsys -require github.com/UBC-NSS/pgo/distsys v0.0.0-20230205084253-49d68d375870 +require github.com/UBC-NSS/pgo/distsys v0.0.0-20241028153046-7065304c9763 require ( github.com/benbjohnson/immutable v0.4.3 // indirect + github.com/cespare/xxhash v1.1.0 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/dgraph-io/badger/v3 v3.2103.5 // indirect + github.com/dgraph-io/ristretto v0.1.1 // indirect + github.com/dustin/go-humanize v1.0.1 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/glog v1.0.0 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/golang/snappy v0.0.4 // indirect + github.com/google/flatbuffers v23.1.21+incompatible // indirect + github.com/klauspost/compress v1.15.15 // indirect + github.com/pkg/errors v0.9.1 // indirect github.com/segmentio/fasthash v1.0.3 // indirect - github.com/stretchr/testify v1.8.0 // indirect + github.com/stretchr/testify v1.8.1 // indirect + go.opencensus.io v0.24.0 // indirect go.uber.org/atomic v1.10.0 // indirect go.uber.org/multierr v1.9.0 // indirect golang.org/x/exp v0.0.0-20230213192124-5e25df0256eb // indirect + golang.org/x/net v0.7.0 // indirect + golang.org/x/sync v0.1.0 // indirect + golang.org/x/sys v0.5.0 // indirect + google.golang.org/protobuf v1.28.1 // indirect ) diff --git a/systems/locksvc/go.sum b/systems/locksvc/go.sum index 9e0bc6d0..fe9fc303 100644 --- a/systems/locksvc/go.sum +++ b/systems/locksvc/go.sum @@ -1,24 +1,210 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8= github.com/benbjohnson/immutable v0.4.3 h1:GYHcksoJ9K6HyAUpGxwZURrbTkXA0Dh4otXGqbhdrjA= github.com/benbjohnson/immutable v0.4.3/go.mod h1:qJIKKSmdqz1tVzNtst1DZzvaqOU1onk1rc03IeM3Owk= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko= +github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc= +github.com/cespare/xxhash/v2 v2.1.1/go.mod 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-4,13 +4,10 @@ CONSTANT defaultInitValue = defaultInitValue CONSTANT NumClients = 5 \* SPECIFICATION definition -SPECIFICATION Spec +SPECIFICATION SpecNoDeadlock \* INVARIANT definition INVARIANT Safety \* PROPERTY definition -PROPERTY Liveness - -\* CHECK_DEADLOCK setting -CHECK_DEADLOCK FALSE \ No newline at end of file +PROPERTY Liveness \ No newline at end of file diff --git a/systems/locksvc/locksvc.go b/systems/locksvc/locksvc.go index 0944f165..9b9d3129 100644 --- a/systems/locksvc/locksvc.go +++ b/systems/locksvc/locksvc.go @@ -199,7 +199,10 @@ var jumpTable = distsys.MakeMPCalJumpTable( if err != nil { return err } - hasLock := iface.RequireArchetypeResource("AClient.hasLock") + hasLock, err := iface.RequireArchetypeResourceRef("AClient.hasLock") + if err != nil { + return err + } var respRead tla.Value respRead, err = iface.Read(network3, []tla.Value{iface.Self()}) if err != nil { @@ -211,7 +214,7 @@ var jumpTable = distsys.MakeMPCalJumpTable( return fmt.Errorf("%w: (resp) = (GrantMsg)", distsys.ErrAssertionFailed) } // no statements - err = iface.Write(hasLock, nil, tla.ModuleTRUE) + err = iface.Write(hasLock, []tla.Value{iface.Self()}, tla.ModuleTRUE) if err != nil { return err } @@ -223,11 +226,18 @@ var jumpTable = distsys.MakeMPCalJumpTable( Body: func(iface distsys.ArchetypeInterface) error { var err error _ = err + hasLock0, err := iface.RequireArchetypeResourceRef("AClient.hasLock") + if err != nil { + return err + } network4, err := iface.RequireArchetypeResourceRef("AClient.network") if err != nil { return err } - hasLock0 := iface.RequireArchetypeResource("AClient.hasLock") + err = iface.Write(hasLock0, []tla.Value{iface.Self()}, tla.ModuleFALSE) + if err != nil { + return err + } err = iface.Write(network4, []tla.Value{ServerID(iface)}, tla.MakeRecord([]tla.RecordField{ {tla.MakeString("from"), iface.Self()}, {tla.MakeString("type"), UnlockMsg(iface)}, @@ -235,10 +245,6 @@ var jumpTable = distsys.MakeMPCalJumpTable( if err != nil { return err } - err = iface.Write(hasLock0, nil, tla.ModuleFALSE) - if err != nil { - return err - } return iface.Goto("AClient.Done") }, }, @@ -266,11 +272,10 @@ var AServer = distsys.MPCalArchetype{ var AClient = distsys.MPCalArchetype{ Name: "AClient", Label: "AClient.acquireLock", - RequiredRefParams: []string{"AClient.network"}, + RequiredRefParams: []string{"AClient.network", "AClient.hasLock"}, RequiredValParams: []string{}, JumpTable: jumpTable, ProcTable: procTable, PreAmble: func(iface distsys.ArchetypeInterface) { - iface.EnsureArchetypeResourceLocal("AClient.hasLock", tla.ModuleFALSE) }, } diff --git a/systems/locksvc/locksvc.tla b/systems/locksvc/locksvc.tla index a376cffe..ba5d4887 100644 --- a/systems/locksvc/locksvc.tla +++ b/systems/locksvc/locksvc.tla @@ -57,8 +57,7 @@ CONSTANT NumClients }; } - archetype AClient(ref network[_]) - variable hasLock = FALSE; + archetype AClient(ref network[_], ref hasLock[_]) { acquireLock: network[ServerID] := [from |-> self, type |-> LockMsg]; @@ -66,26 +65,24 @@ CONSTANT NumClients with (resp = network[self]) { assert resp = GrantMsg; }; - hasLock := TRUE; - \* print <<"in critical section: ", self>>; + hasLock[self] := TRUE; unlock: + hasLock[self] := FALSE; network[ServerID] := [from |-> self, type |-> UnlockMsg]; - hasLock := FALSE; } - variables network = [id \in NodeSet |-> <<>>]; + variables network = [id \in NodeSet |-> <<>>], hasLock = [id \in NodeSet |-> FALSE]; fair process (Server \in ServerSet) == instance AServer(ref network[_]) mapping network[_] via ReliableFIFOLink; - - fair process (client \in ClientSet) == instance AClient(ref network[_]) + fair process (client \in ClientSet) == instance AClient(ref network[_], ref hasLock[_]) mapping network[_] via ReliableFIFOLink; } \* BEGIN PLUSCAL TRANSLATION --algorithm locksvc { - variables network = [id \in NodeSet |-> <<>>]; + variables network = [id \in NodeSet |-> <<>>]; hasLock = [id \in NodeSet |-> FALSE]; define{ ServerID == 0 ServerSet == {ServerID} @@ -144,7 +141,6 @@ CONSTANT NumClients } fair process (client \in ClientSet) - variables hasLock = FALSE; { acquireLock: with (value10 = [from |-> self, type |-> LockMsg]) { @@ -160,14 +156,14 @@ CONSTANT NumClients resp1 = yielded_network00 ) { assert (resp1) = (GrantMsg); - hasLock := TRUE; + hasLock := [hasLock EXCEPT ![self] = TRUE]; goto unlock; }; }; unlock: + hasLock := [hasLock EXCEPT ![self] = FALSE]; with (value20 = [from |-> self, type |-> UnlockMsg]) { network := [network EXCEPT ![ServerID] = Append((network)[ServerID], value20)]; - hasLock := FALSE; goto Done; }; } @@ -176,9 +172,9 @@ CONSTANT NumClients \* END PLUSCAL TRANSLATION ********************) -\* BEGIN TRANSLATION (chksum(pcal) = "48ee4eec" /\ chksum(tla) = "98748790") +\* BEGIN TRANSLATION (chksum(pcal) = "c964cf97" /\ chksum(tla) = "70ef86db") CONSTANT defaultInitValue -VARIABLES network, pc +VARIABLES pc, network, hasLock (* define statement *) ServerID == 0 @@ -189,19 +185,18 @@ LockMsg == 1 UnlockMsg == 2 GrantMsg == 3 -VARIABLES msg, q, hasLock +VARIABLES msg, q -vars == << network, pc, msg, q, hasLock >> +vars == << pc, network, hasLock, msg, q >> ProcSet == (ServerSet) \cup (ClientSet) Init == (* Global variables *) /\ network = [id \in NodeSet |-> <<>>] + /\ hasLock = [id \in NodeSet |-> FALSE] (* Process Server *) /\ msg = [self \in ServerSet |-> defaultInitValue] /\ q = [self \in ServerSet |-> <<>>] - (* Process client *) - /\ hasLock = [self \in ClientSet |-> FALSE] /\ pc = [self \in ProcSet |-> CASE self \in ServerSet -> "serverLoop" [] self \in ClientSet -> "acquireLock"] @@ -209,7 +204,7 @@ serverLoop(self) == /\ pc[self] = "serverLoop" /\ IF TRUE THEN /\ pc' = [pc EXCEPT ![self] = "serverReceive"] ELSE /\ pc' = [pc EXCEPT ![self] = "Done"] - /\ UNCHANGED << network, msg, q, hasLock >> + /\ UNCHANGED << network, hasLock, msg, q >> serverReceive(self) == /\ pc[self] = "serverReceive" /\ (Len((network)[self])) > (0) @@ -218,7 +213,7 @@ serverReceive(self) == /\ pc[self] = "serverReceive" /\ LET yielded_network1 == readMsg00 IN /\ msg' = [msg EXCEPT ![self] = yielded_network1] /\ pc' = [pc EXCEPT ![self] = "serverRespond"] - /\ UNCHANGED << q, hasLock >> + /\ UNCHANGED << hasLock, q >> serverRespond(self) == /\ pc[self] = "serverRespond" /\ IF ((msg[self]).type) = (LockMsg) @@ -240,7 +235,7 @@ serverRespond(self) == /\ pc[self] = "serverRespond" /\ UNCHANGED network ELSE /\ pc' = [pc EXCEPT ![self] = "serverLoop"] /\ UNCHANGED << network, q >> - /\ UNCHANGED << msg, hasLock >> + /\ UNCHANGED << hasLock, msg >> Server(self) == serverLoop(self) \/ serverReceive(self) \/ serverRespond(self) @@ -249,7 +244,7 @@ acquireLock(self) == /\ pc[self] = "acquireLock" /\ LET value10 == [from |-> self, type |-> LockMsg] IN /\ network' = [network EXCEPT ![ServerID] = Append((network)[ServerID], value10)] /\ pc' = [pc EXCEPT ![self] = "criticalSection"] - /\ UNCHANGED << msg, q, hasLock >> + /\ UNCHANGED << hasLock, msg, q >> criticalSection(self) == /\ pc[self] = "criticalSection" /\ (Len((network)[self])) > (0) @@ -258,15 +253,15 @@ criticalSection(self) == /\ pc[self] = "criticalSection" /\ LET yielded_network00 == readMsg10 IN LET resp1 == yielded_network00 IN /\ Assert((resp1) = (GrantMsg), - "Failure of assertion at line 162, column 11.") + "Failure of assertion at line 158, column 11.") /\ hasLock' = [hasLock EXCEPT ![self] = TRUE] /\ pc' = [pc EXCEPT ![self] = "unlock"] /\ UNCHANGED << msg, q >> unlock(self) == /\ pc[self] = "unlock" + /\ hasLock' = [hasLock EXCEPT ![self] = FALSE] /\ LET value20 == [from |-> self, type |-> UnlockMsg] IN /\ network' = [network EXCEPT ![ServerID] = Append((network)[ServerID], value20)] - /\ hasLock' = [hasLock EXCEPT ![self] = FALSE] /\ pc' = [pc EXCEPT ![self] = "Done"] /\ UNCHANGED << msg, q >> @@ -288,16 +283,28 @@ Termination == <>(\A self \in ProcSet: pc[self] = "Done") \* END TRANSLATION +ServerIsIdle == + \E self \in ServerSet : + /\ pc[self] = "serverReceive" + /\ UNCHANGED vars + +SpecNoDeadlock == + /\ Init + /\ [][Next \/ ServerIsIdle]_vars + /\ \A self \in ServerSet : WF_vars(Server(self)) + /\ \A self \in ClientSet : WF_vars(client(self)) + \* Invariants -Safety == \lnot (\A i, j \in ClientSet: - /\ i /= j - /\ hasLock[i] - /\ hasLock[j]) +Safety == + \A i, j \in ClientSet: + (/\ i # j + /\ hasLock[i]) + => ~ hasLock[j] \* Properties -ProgressOK(i) == pc[i] = "acquireLock" ~> pc[i] = "criticalSection" +ProgressOK(i) == pc[i] = "acquireLock" ~> (pc[i] = "criticalSection" ~> pc[i] = "unlock") Liveness == \A i \in NodeSet: ProgressOK(i) ============================================================================= diff --git a/systems/locksvc/locksvc_test.go b/systems/locksvc/locksvc_test.go new file mode 100644 index 00000000..0ec69ea4 --- /dev/null +++ b/systems/locksvc/locksvc_test.go @@ -0,0 +1,162 @@ +package locksvc_test + +import ( + "fmt" + "log" + "sync" + "testing" + + "github.com/DistCompiler/pgo/systems/locksvc" + "github.com/UBC-NSS/pgo/distsys" + "github.com/UBC-NSS/pgo/distsys/resources" + "github.com/UBC-NSS/pgo/distsys/tla" +) + +func addressFn(myIdx tla.Value) func(idx tla.Value) (resources.MailboxKind, string) { + return func(idx tla.Value) (kind resources.MailboxKind, addr string) { + addr = fmt.Sprintf("localhost:%d", idx.AsNumber()+8000) + if myIdx.Equal(idx) { + kind = resources.MailboxesLocal + } else { + kind = resources.MailboxesRemote + } + return + } +} + +func runOrPanic(ctx *distsys.MPCalContext) { + err := (*distsys.MPCalContext)(ctx).Run() + if err != nil { + panic(err.Error()) + } +} + +type matcherResource struct { + distsys.ArchetypeResourceLeafMixin + expectedValue tla.Value + onMatch chan struct{} + lock sync.Mutex +} + +func (m *matcherResource) Abort() chan struct{} { + return nil +} + +func (m *matcherResource) Close() error { + m.lock.Lock() + defer m.lock.Unlock() + + if m.onMatch != nil { + panic("stopped archetype resource while matcher resource was waiting") + } + + return nil +} + +func (m *matcherResource) Commit() chan struct{} { + m.lock.Lock() + defer m.lock.Unlock() + + close(m.onMatch) + m.onMatch = nil + m.expectedValue = tla.Value{} + return nil +} + +func (m *matcherResource) PreCommit() chan error { + return nil +} + +func (m *matcherResource) ReadValue() (tla.Value, error) { + panic("shouldn't be reading a matcher resource") +} + +func (m *matcherResource) WriteValue(value tla.Value) error { + m.lock.Lock() + defer m.lock.Unlock() + + if m.onMatch == nil { + return distsys.ErrCriticalSectionAborted + } + + if m.expectedValue.Equal(value) { + return nil + } else { + return distsys.ErrCriticalSectionAborted + } +} + +func (m *matcherResource) AwaitValue(value tla.Value) chan struct{} { + m.lock.Lock() + defer m.lock.Unlock() + + if m.onMatch != nil { + panic("tried to await a matcherResource that's already being awaited") + } + + m.onMatch = make(chan struct{}) + m.expectedValue = value + return m.onMatch +} + +func whileHoldingLock(clientId tla.Value, body func()) { + matcher := &matcherResource{} + + ctx := distsys.NewMPCalContext(clientId, locksvc.AClient, + distsys.EnsureArchetypeRefParam("network", resources.NewRelaxedMailboxes(addressFn(clientId))), + distsys.EnsureArchetypeRefParam("hasLock", resources.NewIncMap(func(index tla.Value) distsys.ArchetypeResource { + if !index.Equal(clientId) { + panic(fmt.Errorf("Not indexed at clientId %v, got index %v instead", clientId, index)) + } + return matcher + })), + ) + defer ctx.Stop() + go runOrPanic(ctx) + + <-matcher.AwaitValue(tla.MakeBool(true)) + body() + <-matcher.AwaitValue(tla.MakeBool(false)) +} + +func testNClients(t *testing.T, clientCount int) { + srvId := tla.MakeNumber(0) + srvCtx := distsys.NewMPCalContext(srvId, locksvc.AServer, + distsys.EnsureArchetypeRefParam("network", resources.NewRelaxedMailboxes(addressFn(srvId))), + ) + defer srvCtx.Stop() + go runOrPanic(srvCtx) + + completionCh := make(chan struct{}) + counter := 0 + for i := 0; i < clientCount; i++ { + go whileHoldingLock(tla.MakeNumber(int32(i+1)), func() { + counter++ + completionCh <- struct{}{} + }) + } + + for i := 0; i < clientCount; i++ { + <-completionCh + } + close(completionCh) + + finalCounter := counter + if finalCounter != clientCount { + t.Errorf("Wrong counter at end. Got %d, expected %d", finalCounter, clientCount) + } else { + log.Default().Printf("Ended with counter %d", finalCounter) + } +} + +func Test1Client(t *testing.T) { + testNClients(t, 1) +} + +func Test5Clients(t *testing.T) { + testNClients(t, 5) +} + +func Test1000Clients(t *testing.T) { + testNClients(t, 1000) +}