Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 172 insertions, 0 deletions

diff --git a/include/my_atomic.h b/include/my_atomic.h
new file mode 100644
index 00000000..81da9e35
--- /dev/null
+++ b/include/my_atomic.h
@@ -0,0 +1,172 @@
+#ifndef MY_ATOMIC_INCLUDED
+#define MY_ATOMIC_INCLUDED
+
+/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
+   Copyright (c) 2018, 2020, MariaDB
+
+   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/*
+  This header defines five atomic operations:
+
+  my_atomic_add#(&var, what)
+  my_atomic_add#_explicit(&var, what, memory_order)
+    'Fetch and Add'
+    add 'what' to *var, and return the old value of *var
+    All memory orders are valid.
+
+  my_atomic_fas#(&var, what)
+  my_atomic_fas#_explicit(&var, what, memory_order)
+    'Fetch And Store'
+    store 'what' in *var, and return the old value of *var
+    All memory orders are valid.
+
+  my_atomic_cas#(&var, &old, new)
+  my_atomic_cas#_weak_explicit(&var, &old, new, succ, fail)
+  my_atomic_cas#_strong_explicit(&var, &old, new, succ, fail)
+    'Compare And Swap'
+    if *var is equal to *old, then store 'new' in *var, and return TRUE
+    otherwise store *var in *old, and return FALSE
+    succ - the memory synchronization ordering for the read-modify-write
+    operation if the comparison succeeds. All memory orders are valid.
+    fail - the memory synchronization ordering for the load operation if the
+    comparison fails. Cannot be MY_MEMORY_ORDER_RELEASE or
+    MY_MEMORY_ORDER_ACQ_REL and cannot specify stronger ordering than succ.
+
+    The weak form is allowed to fail spuriously, that is, act as if *var != *old
+    even if they are equal. When a compare-and-exchange is in a loop, the weak
+    version will yield better performance on some platforms. When a weak
+    compare-and-exchange would require a loop and a strong one would not, the
+    strong one is preferable.
+
+  my_atomic_load#(&var)
+  my_atomic_load#_explicit(&var, memory_order)
+    return *var
+    Order must be one of MY_MEMORY_ORDER_RELAXED, MY_MEMORY_ORDER_CONSUME,
+    MY_MEMORY_ORDER_ACQUIRE, MY_MEMORY_ORDER_SEQ_CST.
+
+  my_atomic_store#(&var, what)
+  my_atomic_store#_explicit(&var, what, memory_order)
+    store 'what' in *var
+    Order must be one of MY_MEMORY_ORDER_RELAXED, MY_MEMORY_ORDER_RELEASE,
+    MY_MEMORY_ORDER_SEQ_CST.
+
+  '#' is substituted by a size suffix - 8, 16, 32, 64, or ptr
+  (e.g. my_atomic_add8, my_atomic_fas32, my_atomic_casptr).
+
+  The first version orders memory accesses according to MY_MEMORY_ORDER_SEQ_CST,
+  the second version (with _explicit suffix) orders memory accesses according to
+  given memory order.
+
+  memory_order specifies how non-atomic memory accesses are to be ordered around
+  an atomic operation:
+
+  MY_MEMORY_ORDER_RELAXED - there are no constraints on reordering of memory
+                            accesses around the atomic variable.
+  MY_MEMORY_ORDER_CONSUME - no reads in the current thread dependent on the
+                            value currently loaded can be reordered before this
+                            load. This ensures that writes to dependent
+                            variables in other threads that release the same
+                            atomic variable are visible in the current thread.
+                            On most platforms, this affects compiler
+                            optimization only.
+  MY_MEMORY_ORDER_ACQUIRE - no reads in the current thread can be reordered
+                            before this load. This ensures that all writes in
+                            other threads that release the same atomic variable
+                            are visible in the current thread.
+  MY_MEMORY_ORDER_RELEASE - no writes in the current thread can be reordered
+                            after this store. This ensures that all writes in
+                            the current thread are visible in other threads that
+                            acquire the same atomic variable.
+  MY_MEMORY_ORDER_ACQ_REL - no reads in the current thread can be reordered
+                            before this load as well as no writes in the current
+                            thread can be reordered after this store. The
+                            operation is read-modify-write operation. It is
+                            ensured that all writes in another threads that
+                            release the same atomic variable are visible before
+                            the modification and the modification is visible in
+                            other threads that acquire the same atomic variable.
+  MY_MEMORY_ORDER_SEQ_CST - The operation has the same semantics as
+                            acquire-release operation, and additionally has
+                            sequentially-consistent operation ordering.
+
+  We choose implementation as follows: on Windows using Visual C++ the native
+  implementation should be preferable. When using gcc we prefer the Solaris
+  implementation before the gcc because of stability preference, we choose gcc
+  builtins if available.
+*/
+
+#if defined(_MSC_VER)
+#include "atomic/generic-msvc.h"
+#elif defined(HAVE_SOLARIS_ATOMIC)
+#include "atomic/solaris.h"
+#elif defined(HAVE_GCC_C11_ATOMICS)
+#include "atomic/gcc_builtins.h"
+#endif
+
+#if SIZEOF_LONG == 4
+#define my_atomic_addlong(A,B) my_atomic_add32((int32*) (A), (B))
+#define my_atomic_loadlong(A) my_atomic_load32((int32*) (A))
+#define my_atomic_loadlong_explicit(A,O) my_atomic_load32_explicit((int32*) (A), (O))
+#define my_atomic_storelong(A,B) my_atomic_store32((int32*) (A), (B))
+#define my_atomic_faslong(A,B) my_atomic_fas32((int32*) (A), (B))
+#define my_atomic_caslong(A,B,C) my_atomic_cas32((int32*) (A), (int32*) (B), (C))
+#else
+#define my_atomic_addlong(A,B) my_atomic_add64((int64*) (A), (B))
+#define my_atomic_loadlong(A) my_atomic_load64((int64*) (A))
+#define my_atomic_loadlong_explicit(A,O) my_atomic_load64_explicit((int64*) (A), (O))
+#define my_atomic_storelong(A,B) my_atomic_store64((int64*) (A), (B))
+#define my_atomic_faslong(A,B) my_atomic_fas64((int64*) (A), (B))
+#define my_atomic_caslong(A,B,C) my_atomic_cas64((int64*) (A), (int64*) (B), (C))
+#endif
+
+#ifndef MY_MEMORY_ORDER_SEQ_CST
+#define MY_MEMORY_ORDER_RELAXED
+#define MY_MEMORY_ORDER_CONSUME
+#define MY_MEMORY_ORDER_ACQUIRE
+#define MY_MEMORY_ORDER_RELEASE
+#define MY_MEMORY_ORDER_ACQ_REL
+#define MY_MEMORY_ORDER_SEQ_CST
+
+#define my_atomic_store32_explicit(P, D, O) my_atomic_store32((P), (D))
+#define my_atomic_store64_explicit(P, D, O) my_atomic_store64((P), (D))
+#define my_atomic_storeptr_explicit(P, D, O) my_atomic_storeptr((P), (D))
+
+#define my_atomic_load32_explicit(P, O) my_atomic_load32((P))
+#define my_atomic_load64_explicit(P, O) my_atomic_load64((P))
+#define my_atomic_loadptr_explicit(P, O) my_atomic_loadptr((P))
+
+#define my_atomic_fas32_explicit(P, D, O) my_atomic_fas32((P), (D))
+#define my_atomic_fas64_explicit(P, D, O) my_atomic_fas64((P), (D))
+#define my_atomic_fasptr_explicit(P, D, O) my_atomic_fasptr((P), (D))
+
+#define my_atomic_add32_explicit(P, A, O) my_atomic_add32((P), (A))
+#define my_atomic_add64_explicit(P, A, O) my_atomic_add64((P), (A))
+#define my_atomic_addptr_explicit(P, A, O) my_atomic_addptr((P), (A))
+
+#define my_atomic_cas32_weak_explicit(P, E, D, S, F) \
+  my_atomic_cas32((P), (E), (D))
+#define my_atomic_cas64_weak_explicit(P, E, D, S, F) \
+  my_atomic_cas64((P), (E), (D))
+#define my_atomic_casptr_weak_explicit(P, E, D, S, F) \
+  my_atomic_casptr((P), (E), (D))
+
+#define my_atomic_cas32_strong_explicit(P, E, D, S, F) \
+  my_atomic_cas32((P), (E), (D))
+#define my_atomic_cas64_strong_explicit(P, E, D, S, F) \
+  my_atomic_cas64((P), (E), (D))
+#define my_atomic_casptr_strong_explicit(P, E, D, S, F) \
+  my_atomic_casptr((P), (E), (D))
+#endif
+#endif /* MY_ATOMIC_INCLUDED */