Add MDB_NO_ROBUST to disable Robust Mutexes

[platform/upstream/lmdb.git] / libraries / liblmdb / mdb.c

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index d4888be..80b914b 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -252,7 +252,25 @@ union semun {
 #define MDB_OWNERDEAD  EOWNERDEAD      /**< #LOCK_MUTEX0() result if dead owner */
 #endif
 
-#ifdef MDB_OWNERDEAD
+/* Android currently lacks Robust Mutex support */
+#if defined(ANDROID) && defined(MDB_USE_POSIX_MUTEX)
+#define MDB_NO_ROBUST  1
+#endif
+
+/** Some platforms define the EOWNERDEAD error code
+ * even though they don't support Robust Mutexes.
+ * Compile with -DMDB_NO_ROBUST, or use some other
+ * mechanism like -DMDB_USE_SYSV_SEM instead of
+ * -DMDB_USE_POSIX_MUTEX. (SysV semaphores are
+ * also Robust, but some systems don't support them
+ * either.)
+ */
+
+#ifndef MDB_NO_ROBUST
+#define MDB_NO_ROBUST  0
+#endif
+
+#if defined(MDB_OWNERDEAD) && !(MDB_NO_ROBUST)
 #define MDB_ROBUST_SUPPORTED   1
 #endif