1 files changed, 65 insertions, 0 deletions
diff --git a/tests/rwlock6.c b/tests/rwlock6.c
new file mode 100644
index 0000000..38bc419
--- /dev/null
+++ b/tests/rwlock6.c
@@ -0,0 +1,65 @@
+/* 
+ * rwlock6.c
+ *
+ * Check that writer locks have priority.
+ *
+ * Depends on API functions: 
+ *	pthread_rwlock_rdlock()
+ *	pthread_rwlock_wrlock()
+ *	pthread_rwlock_unlock()
+ */
+
+#include "test.h"
+ 
+static pthread_rwlock_t rwlock1 = PTHREAD_RWLOCK_INITIALIZER;
+
+static int bankAccount;
+
+void * wrfunc(void * arg)
+{
+  assert(pthread_rwlock_wrlock(&rwlock1) == 0);
+  Sleep(1000);
+  bankAccount += 10;
+  assert(pthread_rwlock_unlock(&rwlock1) == 0);
+
+  return((void *) bankAccount); 
+}
+ 
+void * rdfunc(void * arg)
+{
+  int ba = 0;
+
+  assert(pthread_rwlock_rdlock(&rwlock1) == 0);
+  ba = bankAccount;
+  assert(pthread_rwlock_unlock(&rwlock1) == 0);
+
+  ba += 10;
+  return((void *) ba); 
+}
+ 
+int
+main()
+{
+  pthread_t wrt1;
+  pthread_t wrt2;
+  pthread_t rdt;
+  int wr1Result = 0;
+  int wr2Result = 0;
+  int rdResult = 0;
+
+  assert(pthread_create(&wrt1, NULL, wrfunc, NULL) == 0);
+  Sleep(200);
+  assert(pthread_create(&rdt, NULL, rdfunc, NULL) == 0);
+  Sleep(200);
+  assert(pthread_create(&wrt2, NULL, wrfunc, NULL) == 0);
+
+  assert(pthread_join(wrt1, (void *) &wr1Result) == 0);
+  assert(pthread_join(wrt2, (void *) &wr2Result) == 0);
+  assert(pthread_join(rdt, (void *) &rdResult) == 0);
+
+  assert(wr1Result == 10);
+  assert(wr2Result == 20);
+  assert(rdResult == 30);
+
+  return 0;
+}