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possible fallbacks
This implements a full memory barrier.
On ubuntu amd64 with results in an 'mfence' instruction.
This is required to syncronization between threads, where
there's typically only one write of a memory that should be
synced between all threads with the barrier.
Much more details can be found here:
https://gcc.gnu.org/onlinedocs/gcc-7.3.0/gcc/_005f_005fatomic-Builtins.html#g_t_005f_005fatomic-Builtins
https://gcc.gnu.org/onlinedocs/gcc-7.3.0/gcc/_005f_005fsync-Builtins.html#g_t_005f_005fsync-Builtins
The main one we use seems to be in C11 via stdatomic.h,
the oldest fallback is __sync_synchronize(), which is available
since 2005 in gcc.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
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solaris 11
Without this we got the following defines in config.h:
#define HAVE_DECL_PTHREAD_MUTEXATTR_SETROBUST_NP 1
#define HAVE_DECL_PTHREAD_MUTEX_CONSISTENT_NP 1
#define HAVE_PTHREAD_MUTEXATTR_SETROBUST 1
#define HAVE_PTHREAD_MUTEX_CONSISTENT 1
#define HAVE_ROBUST_MUTEXES 1
#define USE_TDB_MUTEX_LOCKING 1
And the build failed with PTHREAD_MUTEX_ROBUST being unknown.
Note that PTHREAD_MUTEX_ROBUST and PTHREAD_MUTEX_ROBUST_NP are enum values
while they're defines on solaris 11
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11319
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
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Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
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Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
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Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
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