Mutex-free implementation of pthread_rwlock

Bug: 8133149
Change-Id: Id6775010d95f2634b173daa55d87a59a3cf4131b

1 files changed, 37 insertions, 0 deletions

diff --git a/tests/pthread_test.cpp b/tests/pthread_test.cpp
index fa66d21d9..801540431 100644
--- a/tests/pthread_test.cpp
+++ b/tests/pthread_test.cpp
@@ -551,11 +551,48 @@ TEST(pthread, pthread_rwlock_smoke) {
   pthread_rwlock_t l;
   ASSERT_EQ(0, pthread_rwlock_init(&l, NULL));
 
+  // Single read lock
   ASSERT_EQ(0, pthread_rwlock_rdlock(&l));
   ASSERT_EQ(0, pthread_rwlock_unlock(&l));
 
+  // Multiple read lock
+  ASSERT_EQ(0, pthread_rwlock_rdlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_rdlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+
+  // Write lock
+   ASSERT_EQ(0, pthread_rwlock_wrlock(&l));
+   ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+
+  // Try writer lock
+  ASSERT_EQ(0, pthread_rwlock_trywrlock(&l));
+  ASSERT_EQ(EBUSY, pthread_rwlock_trywrlock(&l));
+  ASSERT_EQ(EBUSY, pthread_rwlock_tryrdlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+
+  // Try reader lock
+  ASSERT_EQ(0, pthread_rwlock_tryrdlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_tryrdlock(&l));
+  ASSERT_EQ(EBUSY, pthread_rwlock_trywrlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+
+  // Try writer lock after unlock
+  ASSERT_EQ(0, pthread_rwlock_wrlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+
+#ifdef __BIONIC__
+  // EDEADLK in "read after write"
+  ASSERT_EQ(0, pthread_rwlock_wrlock(&l));
+  ASSERT_EQ(EDEADLK, pthread_rwlock_rdlock(&l));
+  ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+
+  // EDEADLK in "write after write"
   ASSERT_EQ(0, pthread_rwlock_wrlock(&l));
+  ASSERT_EQ(EDEADLK, pthread_rwlock_wrlock(&l));
   ASSERT_EQ(0, pthread_rwlock_unlock(&l));
+#endif
 
   ASSERT_EQ(0, pthread_rwlock_destroy(&l));
 }