From d8f767c12f18c229627a49d709ba08fa19bf1e10 Mon Sep 17 00:00:00 2001
From: Justin Anderson <jander@mit.edu>
Date: Wed, 10 Oct 2007 19:02:54 +0000
Subject: [PATCH] simple multithreaded locking test for ccapi

ticket: 5459

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@20112 dc483132-0cff-0310-8789-dd5450dbe970
---
 src/ccapi/test/Makefile           |  7 +++-
 src/ccapi/test/simple_lock_test.c | 69 +++++++++++++++++++++++++++++++
 src/ccapi/test/test_ccapi.sh      |  2 +
 3 files changed, 76 insertions(+), 2 deletions(-)
 create mode 100644 src/ccapi/test/simple_lock_test.c

diff --git a/src/ccapi/test/Makefile b/src/ccapi/test/Makefile
index 31655f99d..bd7d743ad 100644
--- a/src/ccapi/test/Makefile
+++ b/src/ccapi/test/Makefile
@@ -20,7 +20,7 @@ TEST_NAMES = test_constants test_cc_initialize test_cc_context_get_version test_
 
 TEST_OBJECTS = $(patsubst %,$(OBJDIR)/%.o,$(TEST_NAMES))
 
-all: setup-test-dir build-base build-tests link-tests copy-script success-message
+all: setup-test-dir simple_lock_test build-base build-tests link-tests copy-script success-message
 
 # compile base files used by all tests
 build-base: $(OBJECTS)
@@ -28,7 +28,7 @@ build-base: $(OBJECTS)
 # compile each test
 build-tests: $(TEST_OBJECTS)
 
-# rule to compile files in src directory
+# rule to compile src files
 $(OBJDIR)/%.o: %.c
 	$(CC) -c -o $@ $<
 
@@ -45,6 +45,9 @@ link-tests: $(TEST_NAMES)
 $(TEST_NAMES): $(TEST_OBJECTS)
 	$(CC) -o $(TESTDIR)/$@ $(OBJDIR)/$@.o $(OBJECTS) $(LIBS)
 
+simple_lock_test:
+	$(CC) -o $(TESTDIR)/simple_lock_test simple_lock_test.c $(LIBS)
+
 copy-script:
 	cp $(SCRIPT_NAME) $(DSTDIR)/$(SCRIPT_NAME)
 
diff --git a/src/ccapi/test/simple_lock_test.c b/src/ccapi/test/simple_lock_test.c
new file mode 100644
index 000000000..6674a1ef6
--- /dev/null
+++ b/src/ccapi/test/simple_lock_test.c
@@ -0,0 +1,69 @@
+/*
+    simple_lock_test.c
+    
+    Initializes two contexts in two different threads and tries to get read locks on both at the same time.
+    Hangs at line 24.
+*/
+#include <pthread.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <Kerberos/CredentialsCache.h>
+
+void * other_thread ()
+{
+    cc_int32 err;
+    cc_context_t context = NULL;
+    
+    err = cc_initialize(&context, ccapi_version_7, NULL, NULL);
+
+    fprintf(stderr, "thread: attempting lock. may hang. err == %d\n", err);
+
+    if (!err) {
+        // hangs with cc_lock_read which should succeed immediately, but does not hang with write, upgrade, and downgrade, which fail immediately
+        err = cc_context_lock(context, cc_lock_read, cc_lock_noblock);
+    }
+
+    if (context) {
+        cc_context_unlock(context);
+        cc_context_release(context);
+        context = NULL;
+    }
+    fprintf(stderr, "thread: return. err == %d\n", err);
+}
+
+
+int main (int argc, char *argv[])
+{
+    cc_int32 err;
+    int status;
+    pthread_t thread_id;
+    cc_context_t context = NULL;
+    
+    err = cc_initialize(&context, ccapi_version_7, NULL, NULL);
+    if (!err) {
+        err = cc_context_lock(context, cc_lock_read, cc_lock_noblock);
+    }
+    
+    fprintf(stderr, "main: initialized and read locked context. err == %d\n", err);
+
+    status = pthread_create (&thread_id, NULL, (void *) other_thread, NULL);
+    if (status != 0) {
+        fprintf(stderr,"Create error!\n");
+        exit(-1);
+    }
+
+    pthread_join(thread_id, NULL);
+    
+    fprintf(stderr, "main: unlocking and releasing context. err == %d\n", err);
+    
+    if (context) {
+        cc_context_unlock(context);
+        cc_context_release(context);
+        context = NULL;
+    }
+
+    fprintf(stderr, "main: return. err == %d\n", err);
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/src/ccapi/test/test_ccapi.sh b/src/ccapi/test/test_ccapi.sh
index a59aa0c28..ed833c162 100644
--- a/src/ccapi/test/test_ccapi.sh
+++ b/src/ccapi/test/test_ccapi.sh
@@ -15,6 +15,8 @@ function run_test {
 printf "\nBeginning test of CCAPI...\n"
 printf "\nThese tests are based on the CCAPI v3 revision 8 draft documentation.\n"
 
+run_test simple_lock_test
+
 run_test test_constants
 
 run_test test_cc_initialize
-- 
2.26.2