latest sources commit

deps/mysqllite/include/internal/atomic/nolock.h

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+#ifndef ATOMIC_NOLOCK_INCLUDED
+#define ATOMIC_NOLOCK_INCLUDED
+
+/* Copyright (C) 2006 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#if defined(__i386__) || defined(_MSC_VER) || defined(__x86_64__)   \
+    || defined(HAVE_GCC_ATOMIC_BUILTINS) \
+    || defined(HAVE_SOLARIS_ATOMIC)
+
+#  ifdef MY_ATOMIC_MODE_DUMMY
+#    define LOCK_prefix ""
+#  else
+#    define LOCK_prefix "lock"
+#  endif
+/*
+  We choose implementation as follows:
+  ------------------------------------
+  On Windows using Visual C++ the native implementation should be
+  preferrable. When using gcc we prefer the Solaris implementation
+  before the gcc because of stability preference, we choose gcc
+  builtins if available, otherwise we choose the somewhat broken
+  native x86 implementation. If neither Visual C++ or gcc we still
+  choose the Solaris implementation on Solaris (mainly for SunStudio
+  compilers).
+*/
+#  if defined(_MSV_VER)
+#    include "generic-msvc.h"
+#  elif __GNUC__
+#    if defined(HAVE_SOLARIS_ATOMIC)
+#      include "solaris.h"
+#    elif defined(HAVE_GCC_ATOMIC_BUILTINS)
+#      include "gcc_builtins.h"
+#    elif defined(__i386__) || defined(__x86_64__)
+#      include "x86-gcc.h"
+#    endif
+#  elif defined(HAVE_SOLARIS_ATOMIC)
+#    include "solaris.h"
+#  endif
+#endif
+
+#if defined(make_atomic_cas_body)
+/*
+  Type not used so minimal size (emptry struct has different size between C
+  and C++, zero-length array is gcc-specific).
+*/
+typedef char my_atomic_rwlock_t __attribute__ ((unused));
+#define my_atomic_rwlock_destroy(name)
+#define my_atomic_rwlock_init(name)
+#define my_atomic_rwlock_rdlock(name)
+#define my_atomic_rwlock_wrlock(name)
+#define my_atomic_rwlock_rdunlock(name)
+#define my_atomic_rwlock_wrunlock(name)
+
+#endif
+
+#endif /* ATOMIC_NOLOCK_INCLUDED */