diff --git a/Makefile.am b/Makefile.am
index c699ace..83e9517 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6,4 +6,16 @@ docs:
 	doxygen doc/Doxyfile-api
 	doxygen doc/Doxyfile-developers
 
-.PHONY: docs
\ No newline at end of file
+precoverage : 
+	find . -name '*.bb' | xargs rm -f
+	find . -name '*.bbg' | xargs rm -f
+	find . -name '*.da' | xargs rm -f
+
+coverage: precoverage check
+	echo '(make profile requires CFLAGS="-fprofile-arcs -ftest-coverage -pg -O0")'
+	lcov -c --directory src/libdfa/ --directory src/lladd/ --directory test/   > tmp.info
+#	lcov -c --directory .  > tmp.info
+	genhtml -o doc/coverage tmp.info
+	rm tmp.info
+
+.PHONY: docs precoverage coverage
\ No newline at end of file
diff --git a/README b/README
index af2e1ea..f6c6726 100644
--- a/README
+++ b/README
@@ -34,3 +34,27 @@ http://mission.base.com/peter/source/
 LLADD's version of the package adds the jbhash.* files, and compiles PBL using
 LLADD's make files.  Currently, LLADD's hash table implementations are based upon
 code from PBL, and pbl is used in a number of places throughout LLADD.
+
+In order to use gcc's profiling and coverage tools (gprof, and gcov, respectively),
+ execute this command:
+
+export CFLAGS="-fprofile-arcs -ftest-coverage -pg -O0"
+./configure
+make clean
+make check
+
+
+The 'make check' step will output profiles and test coverage that reflects the test
+cases.  You can simply invoke 'make' if you are interested in profiling the 
+library for a specific program.
+
+To produce the gcov output, you may then run this command in src/
+
+ls *.c logger/*.c operations/*.c page/*.c | xargs -n 1 gcov | grep  executed | sort -k1,1n
+
+Or, run this:
+
+lcov -c --directory .  > tmp.info
+genhtml tmp.info
+
+For HTML output.
\ No newline at end of file
diff --git a/clean.sh b/clean.sh
index 06b9f2e..ed08e1a 100755
--- a/clean.sh
+++ b/clean.sh
@@ -1,10 +1,13 @@
 #! /bin/sh
 make distclean
-rm -rf Makefile.in  aclocal.m4  autom4te.cache  config.h.in  configure  depcomp  hello.c  install-sh  missing doc/api doc/developers
+rm -rf Makefile.in  aclocal.m4  autom4te.cache  config.h.in  configure  depcomp  hello.c  install-sh  missing doc/api doc/developers doc/coverage autoscan.log configure.scan
 find . | grep \~$ | xargs rm -f
+find . -name '*.bb' | xargs rm -f
+find . -name '*.bbg' | xargs rm -f
+find . -name '*.da' | xargs rm -f
 find . | perl -ne 'print if (/\/core(\.\d+)?$/)' | xargs rm -f
 find . | perl -ne 'print if (/\/Makefile.in$/)' | xargs rm -f
 find . | perl -ne 'print if (/\/storefile.txt$/)' | xargs rm -f
 find . | perl -ne 'print if (/\/logfile.txt$/)' | xargs rm -f
 find . | perl -ne 'print if (/\/blob._file.txt$/)' | xargs rm -f
-
+rm -f test/gmon.out test/lladd/gmon.out
diff --git a/doc/index.html b/doc/index.html
index 56332a3..02e368d 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -11,6 +11,7 @@ functionality in a modular way.</p>
 <ul>
    <li><a href="api/html/index.html">User Guide (API)</a></li>
    <li><a href="developers/html/index.html">Documentation of LLADD's internals</a></li>
+   <li><a href="coverage/index.html">Unit Test Coverage Report</a></li>
 </ul>
 
 <hr>
diff --git a/src/libdfa/rw.c b/src/libdfa/rw.c
index f7ca7a5..c03f6c1 100644
--- a/src/libdfa/rw.c
+++ b/src/libdfa/rw.c
@@ -83,8 +83,11 @@ void downgradelock(rwl * lock) {
   assert(lock->writers);
   lock->writers--;
   lock->readers++;
-  pthread_cond_signal (lock->writeOK); 
-  pthread_cond_broadcast(lock->readOK);
+  if(lock->waiting) {
+    pthread_cond_signal (lock->writeOK); 
+  } else {
+    pthread_cond_broadcast(lock->readOK);
+  }
   pthread_mutex_unlock(lock->mut);
 }
 
@@ -92,13 +95,18 @@ void unlock(rwl * lock) {
   pthread_mutex_lock (lock->mut);
   if(lock->readers) {
     lock->readers--;
-    pthread_cond_signal (lock->writeOK);
+    if(lock->waiting) {
+      pthread_cond_signal (lock->writeOK);
+    }
   } else {
     assert (lock->writers);
     lock->writers--;
     /* Need this as well (in case there's another writer, which is blocking the all of the readers. */
-    pthread_cond_signal (lock->writeOK); 
-    pthread_cond_broadcast (lock->readOK);
+    if(lock->waiting) {
+      pthread_cond_signal (lock->writeOK); 
+    } else {
+      pthread_cond_broadcast (lock->readOK);
+    }
   }
   pthread_mutex_unlock (lock->mut);
 }
diff --git a/test/lladd/check_blobRecovery.c b/test/lladd/check_blobRecovery.c
index e3ee2ca..092385a 100644
--- a/test/lladd/check_blobRecovery.c
+++ b/test/lladd/check_blobRecovery.c
@@ -129,15 +129,15 @@ END_TEST
 
     @todo:  Until we have a non-idempotent operation on blobs, this test can't be written.
 */
-START_TEST (recoverBlob__exactlyOnce) {
+/* START_TEST (recoverBlob__exactlyOnce) {
   
   int xid; 
   int j;
   int k;
   recordid rid;
-  /*  if(1) {
+  / *  if(1) {
     return;
-    } */
+    } * /
   fail_unless(0, "Need to write this test...");
 
   Tinit();
@@ -161,7 +161,7 @@ START_TEST (recoverBlob__exactlyOnce) {
   
   Tdeinit();
 
-  Tinit();  /* Runs recovery.. */
+  Tinit();  / * Runs recovery.. * /
 
   k = 12312;
 
@@ -180,7 +180,7 @@ START_TEST (recoverBlob__exactlyOnce) {
 }
 END_TEST
 
-
+*/
 /** 
     @test
     Makes sure that aborted idempotent operations are correctly undone.
@@ -266,15 +266,15 @@ END_TEST
 
     @todo  logical operations on blobs.
 */
-START_TEST (recoverBlob__exactlyOnceAbort) {
+/* START_TEST (recoverBlob__exactlyOnceAbort) {
   
   int xid; 
   int j;
   int k;
   recordid rid;
-  /*  if(1) 
+  / *  if(1) 
     return ;
-  */
+  * /
   fail_unless(0, "Need to write this test...");
 
   Tinit();
@@ -311,20 +311,20 @@ START_TEST (recoverBlob__exactlyOnceAbort) {
 
 }
 END_TEST
-
+*/
 /**
    @test 
    Check the CLR mechanism with an aborted logical operation, and multipl Tinit()/Tdeinit() cycles.
 
    @todo Devise a way of implementing this for blobs. 
 */
-START_TEST(recoverBlob__clr) {
+/*START_TEST(recoverBlob__clr) {
   recordid rid;
   int xid;
   int j;
   int k;
 
-  /*  if(1) return; */
+  / *  if(1) return; * /
 
   fail_unless(0, "Need to write this test...");
 
@@ -381,7 +381,7 @@ START_TEST(recoverBlob__clr) {
 
 
 } END_TEST
-
+*/
 void simulateBufferManagerCrash();
 extern int numActiveXactions;
 /** 
@@ -550,22 +550,22 @@ Suite * check_suite(void) {
   Suite *s = suite_create("recovery_suite");
   /* Begin a new test */
   TCase *tc = tcase_create("recovery");
-  void * foobar;  /* used to supress warnings. */
+  /* void * foobar; */  /* used to supress warnings. */
   /* Sub tests are added, one per line, here */
   tcase_add_test(tc, recoverBlob__idempotent);
-  /*   tcase_add_test(tc, recoverBlob__exactlyOnce); */
-  foobar = (void*)&recoverBlob__exactlyOnce;
+  /*  tcase_add_test(tc, recoverBlob__exactlyOnce); 
+      foobar = (void*)&recoverBlob__exactlyOnce; */
 
   tcase_add_test(tc, recoverBlob__idempotentAbort);
-  /* tcase_add_test(tc, recoverBlob__exactlyOnceAbort); */
-  foobar = (void*)&recoverBlob__exactlyOnceAbort;
+  /*  tcase_add_test(tc, recoverBlob__exactlyOnceAbort);
+      foobar = (void*)&recoverBlob__exactlyOnceAbort; 
 
-  /* tcase_add_test(tc, recoverBlob__clr); */
-  foobar = (void*)&recoverBlob__clr;
+  tcase_add_test(tc, recoverBlob__clr);
+  foobar = (void*)&recoverBlob__clr; */
 
   tcase_add_test(tc, recoverBlob__crash);
-  /* tcase_add_test(tc, recoverBlob__multiple_xacts); */
-  foobar = (void*)&recoverBlob__multiple_xacts;  
+  tcase_add_test(tc, recoverBlob__multiple_xacts); 
+    /*foobar = (void*)&recoverBlob__multiple_xacts;   */
 
   /* --------------------------------------------- */
   tcase_add_checked_fixture(tc, setup, teardown);
diff --git a/test/lladd/check_logWriter.c b/test/lladd/check_logWriter.c
index e8bce97..826c4c9 100644
--- a/test/lladd/check_logWriter.c
+++ b/test/lladd/check_logWriter.c
@@ -240,7 +240,7 @@ START_TEST(logWriterTruncate) {
 
 } END_TEST
 
-#define ENTRIES_PER_THREAD 1000
+#define ENTRIES_PER_THREAD 2000
 
 pthread_mutex_t random_mutex;
 
@@ -318,7 +318,7 @@ START_TEST(logWriterCheckWorker) {
 
 START_TEST(logWriterCheckThreaded) {
 
-#define  THREAD_COUNT 50
+#define  THREAD_COUNT 100
   pthread_t workers[THREAD_COUNT];
   int i;
   pthread_mutex_init(&random_mutex, NULL);