Added BOOST_ATOMIC_NO_DARWIN_ULOCK macro.

The new macro disables ulock-based implementation of waiting and notifying
operations on Darwin systems. This may be useful to comply with Apple
App Store requirements.

Closes #55.

doc/atomic.qbk

@@ -1,6 +1,6 @@
 [/
  / Copyright (c) 2009 Helge Bahmann
- / Copyright (c) 2014, 2017, 2018, 2020, 2021 Andrey Semashev
+ / Copyright (c) 2014, 2017, 2018, 2020-2022 Andrey Semashev
  /
  / Distributed under the Boost Software License, Version 1.0. (See accompanying
  / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
@@ -11,7 +11,7 @@
     [authors [Bahmann, Helge][Semashev, Andrey]]
     [copyright 2011 Helge Bahmann]
     [copyright 2012 Tim Blechmann]
-    [copyright 2013, 2017, 2018, 2020, 2021 Andrey Semashev]
+    [copyright 2013, 2017, 2018, 2020-2022 Andrey Semashev]
     [id atomic]
     [dirname atomic]
     [purpose Atomic operations]
@@ -386,6 +386,9 @@ The following macros affect library behavior:
     [[`BOOST_ATOMIC_NO_FLOATING_POINT`] [When defined, support for floating point operations is disabled.
       Floating point types shall be treated similar to trivially copyable structs and no capability macros
       will be defined.]]
+    [[`BOOST_ATOMIC_NO_DARWIN_ULOCK`] [Affects compilation on Darwin systems (Mac OS, iOS, tvOS, watchOS).
+      When defined, disables use of `ulock` API to implement waiting and notifying operations. This may
+      be useful to comply with Apple App Store requirements.]]
     [[`BOOST_ATOMIC_FORCE_FALLBACK`] [When defined, all operations are implemented with locks.
       This is mostly used for testing and should not be used in real world projects.]]
     [[`BOOST_ATOMIC_DYN_LINK` and `BOOST_ALL_DYN_LINK`] [Control library linking. If defined,

doc/changelog.qbk

@@ -10,6 +10,7 @@
 [heading Boost 1.79]
 
 * Fixed compilation for Universal Windows Platform (UWP). ([github_issue 54])
+* Added `BOOST_ATOMIC_NO_DARWIN_ULOCK` configuration macro. The macto affects compilation on Darwin systems and disables `ulock`-based implementation of waiting and notifying operations. This may be useful to comply with Apple App Store requirements. ([github_issue 55])
 
 [heading Boost 1.78]
 

include/boost/atomic/detail/platform.hpp

@@ -100,12 +100,12 @@
     ((defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 407)) ||\
         (defined(BOOST_CLANG) && ((__clang_major__ * 100 + __clang_minor__) >= 302))) &&\
     (\
-        (__GCC_ATOMIC_BOOL_LOCK_FREE + 0) == 2 ||\
-        (__GCC_ATOMIC_CHAR_LOCK_FREE + 0) == 2 ||\
-        (__GCC_ATOMIC_SHORT_LOCK_FREE + 0) == 2 ||\
-        (__GCC_ATOMIC_INT_LOCK_FREE + 0) == 2 ||\
-        (__GCC_ATOMIC_LONG_LOCK_FREE + 0) == 2 ||\
-        (__GCC_ATOMIC_LLONG_LOCK_FREE + 0) == 2\
+        (__GCC_ATOMIC_BOOL_LOCK_FREE == 2) ||\
+        (__GCC_ATOMIC_CHAR_LOCK_FREE == 2) ||\
+        (__GCC_ATOMIC_SHORT_LOCK_FREE == 2) ||\
+        (__GCC_ATOMIC_INT_LOCK_FREE == 2) ||\
+        (__GCC_ATOMIC_LONG_LOCK_FREE == 2) ||\
+        (__GCC_ATOMIC_LLONG_LOCK_FREE == 2)\
     )
 
 #define BOOST_ATOMIC_DETAIL_CORE_BACKEND gcc_atomic
@@ -153,10 +153,11 @@
 #if defined(BOOST_ATOMIC_DETAIL_HAS_FUTEX)
 #define BOOST_ATOMIC_DETAIL_WAIT_BACKEND futex
 #elif defined(__APPLE__)
-#if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200) || \
+#if !defined(BOOST_ATOMIC_NO_DARWIN_ULOCK) && (\
+    (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200) || \
     (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ >= 100000) || \
     (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ >= 100000) || \
-    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 30000)
+    (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 30000))
 // Darwin 16+ supports ulock API
 #define BOOST_ATOMIC_DETAIL_WAIT_BACKEND darwin_ulock
 #endif // __ENVIRONMENT_*_VERSION_MIN_REQUIRED__