[infer][threadsafety] model tryLock() for java.util.concurrent.locks.Lock

Summary: we were just missing this model, adding it

Reviewed By: sblackshear

Differential Revision: D4701435

fbshipit-source-id: 9718305

infer/src/checkers/ThreadSafety.ml

@@ -55,9 +55,8 @@ module TransferFunctions (CFG : ProcCfg.S) = struct
     | Typ.Procname.Java java_pname ->
         begin
           match Typ.Procname.java_get_class_name java_pname, Typ.Procname.java_get_method java_pname with
-          | "java.util.concurrent.locks.Lock", "lock" ->
-              Lock
-          | ("java.util.concurrent.locks.ReentrantLock"
+          | ("java.util.concurrent.locks.Lock"
+            | "java.util.concurrent.locks.ReentrantLock"
             | "java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock"
             | "java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock"),
             ("lock" | "tryLock" | "lockInterruptibly") ->

infer/tests/codetoanalyze/java/threadsafety/Locks.java

@@ -76,6 +76,13 @@ public class Locks {
     mReentrantLock.unlock();
   }
 
+  public void normalLockTryLockOk() {
+    if (mLock.tryLock()) {
+      f = 42;
+      mLock.unlock();
+    }
+  }
+
   public void rReentrantLockTryLockOk() {
     if (mReentrantLock.tryLock()) {
       f = 42;
@@ -83,6 +90,7 @@ public class Locks {
     }
   }
 
+
   public void reentrantLockInterruptiblyOk() throws InterruptedException {
     mReentrantLock.lockInterruptibly();
     f = 42;