From 79b12bbd7bb806c7f70b305e976b8c3e63823f2a Mon Sep 17 00:00:00 2001 From: Howard Chu Date: Wed, 11 Nov 2015 00:02:06 +0000 Subject: [PATCH] Tweak robust mutex detection for glibc --- libraries/liblmdb/mdb.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c index 98c7383..9af3704 100644 --- a/libraries/liblmdb/mdb.c +++ b/libraries/liblmdb/mdb.c @@ -238,7 +238,9 @@ typedef SSIZE_T ssize_t; #define MDB_OWNERDEAD EOWNERDEAD /**< #LOCK_MUTEX0() result if dead owner */ #endif - +#ifdef __GLIBC__ +#define GLIBC_VER ((__GLIBC__ << 16 )| __GLIBC_MINOR__) +#endif /** Some platforms define the EOWNERDEAD error code * even though they don't support Robust Mutexes. * Compile with -DMDB_USE_ROBUST=0, or use some other @@ -248,12 +250,19 @@ typedef SSIZE_T ssize_t; * either.) */ #ifndef MDB_USE_ROBUST -/* Android currently lacks Robust Mutex support */ -#if defined(ANDROID) && defined(MDB_USE_POSIX_MUTEX) && !defined(MDB_USE_ROBUST) -#define MDB_USE_ROBUST 0 -#else -#define MDB_USE_ROBUST 1 -#endif +/* Android currently lacks Robust Mutex support. So does glibc < 2.4. */ +# if defined(MDB_USE_POSIX_MUTEX) && (defined(ANDROID) || \ + (defined(__GLIBC__) && GLIBC_VER < 0x020004)) +# define MDB_USE_ROBUST 0 +# else +# define MDB_USE_ROBUST 1 +/* glibc < 2.10 only provided _np API */ +# if defined(__GLIBC__) && GLIBC_VER < 0x02000a +# define PTHREAD_MUTEX_ROBUST PTHREAD_MUTEX_ROBUST_NP +# define pthread_mutexattr_setrobust(attr, flag) pthread_mutexattr_setrobust_np(attr, flag) +# define pthread_mutex_consistent(mutex) pthread_mutex_consistent_np(mutex) +# endif +# endif #endif /* MDB_USE_ROBUST */ #if defined(MDB_OWNERDEAD) && MDB_USE_ROBUST