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| author | Ivan Maidanski <ivmai@mail.ru> | 2018-11-21 00:19:20 +0300 |
|---|---|---|
| committer | Ivan Maidanski <ivmai@mail.ru> | 2018-11-21 00:19:20 +0300 |
| commit | 016f30060f3c34a69387fa64e1f75f69057d57c0 (patch) | |
| tree | 5249a13d3708ec3143c9d0d8bca9f9b840f03310 /configure.ac | |
| parent | 70283bbb4590a386ab11201feb578ed50166f030 (diff) | |
| download | bdwgc-016f30060f3c34a69387fa64e1f75f69057d57c0.tar.gz | |
Fix a deadlock in write_fault_handler if AO_or is emulated
* configure.ac [$with_libatomic_ops!=none && $need_atomic_ops_asm!=true]
(HAVE_LOCKFREE_AO_OR): New AC_DEFINE (defined in case of success of
AC_TRY_LINK of a code snippet calling AO_or).
* include/private/gc_atomic_ops.h [GC_BUILTIN_ATOMIC
&& !NO_LOCKFREE_AO_OR] (HAVE_LOCKFREE_AO_OR): Define (to 1).
* include/private/gc_priv.h [THREADS] (GC_acquire_dirty_lock,
GC_release_dirty_lock): Define to no-op only if HAVE_LOCKFREE_AO_OR
or GC_DISABLE_INCREMENTAL.
* os_dep.c [!GC_DISABLE_INCREMENTAL] (async_set_pht_entry_from_index):
Use set_pht_entry_from_index_concurrent() only if HAVE_LOCKFREE_AO_OR
(or not THREADS).
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 7db06459..0fd56663 100644 --- a/configure.ac +++ b/configure.ac @@ -1109,6 +1109,13 @@ AM_CONDITIONAL([NEED_ATOMIC_OPS_ASM], AS_IF([test x$with_libatomic_ops != xnone -a x$need_atomic_ops_asm != xtrue], [ old_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $AO_TRYLINK_CFLAGS $CFLAGS_EXTRA" + AC_MSG_CHECKING([for lock-free AO_or primitive]) + AC_TRY_LINK([#include "atomic_ops.h"], + [AO_t x=0;AO_or(&x,1)], + [ AC_MSG_RESULT(yes) + AC_DEFINE([HAVE_LOCKFREE_AO_OR], [1], + [libatomic_ops AO_or primitive implementation is lock-free.]) ], + [ AC_MSG_RESULT(no) ]) AC_MSG_CHECKING([for lock-free AO load/store, test-and-set primitives]) AC_TRY_LINK([#include "atomic_ops.h"], [AO_t x=0;unsigned char c=0;AO_TS_t z=AO_TS_INITIALIZER; |