1 /*
2 * Distributed under the Boost Software License, Version 1.0.
3 * (See accompanying file LICENSE_1_0.txt or copy at
4 * http://www.boost.org/LICENSE_1_0.txt)
5 *
6 * Copyright (c) 2014 Andrey Semashev
7 */
8 /*!
9 * \file atomic/detail/ops_gcc_atomic.hpp
10 *
11 * This header contains implementation of the \c operations template.
12 */
13
14 #ifndef BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_
15 #define BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_
16
17 #include <boost/memory_order.hpp>
18 #include <boost/atomic/detail/config.hpp>
19 #include <boost/atomic/detail/storage_type.hpp>
20 #include <boost/atomic/detail/operations_fwd.hpp>
21 #include <boost/atomic/capabilities.hpp>
22 #if defined(__clang__) && (defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B) || defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B))
23 #include <boost/atomic/detail/ops_gcc_x86_dcas.hpp>
24 #include <boost/atomic/detail/ops_cas_based.hpp>
25 #endif
26
27 #if __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE || __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE ||\
28 __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE || __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE ||\
29 __GCC_ATOMIC_CHAR_LOCK_FREE != BOOST_ATOMIC_CHAR_LOCK_FREE || __GCC_ATOMIC_BOOL_LOCK_FREE != BOOST_ATOMIC_BOOL_LOCK_FREE ||\
30 __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE
31 // There are platforms where we need to use larger storage types
32 #include <boost/atomic/detail/int_sizes.hpp>
33 #include <boost/atomic/detail/ops_extending_cas_based.hpp>
34 #endif
35
36 #ifdef BOOST_HAS_PRAGMA_ONCE
37 #pragma once
38 #endif
39
40 #if defined(__INTEL_COMPILER)
41 // This is used to suppress warning #32013 described below for Intel Compiler.
42 // In debug builds the compiler does not inline any functions, so basically
43 // every atomic function call results in this warning. I don't know any other
44 // way to selectively disable just this one warning.
45 #pragma system_header
46 #endif
47
48 namespace boost {
49 namespace atomics {
50 namespace detail {
51
52 /*!
53 * The function converts \c boost::memory_order values to the compiler-specific constants.
54 *
55 * NOTE: The intention is that the function is optimized away by the compiler, and the
56 * compiler-specific constants are passed to the intrinsics. I know constexpr doesn't
57 * work in this case because the standard atomics interface require memory ordering
58 * constants to be passed as function arguments, at which point they stop being constexpr.
59 * However it is crucial that the compiler sees constants and not runtime values,
60 * because otherwise it just ignores the ordering value and always uses seq_cst.
61 * This is the case with Intel C++ Compiler 14.0.3 (Composer XE 2013 SP1, update 3) and
62 * gcc 4.8.2. Intel Compiler issues a warning in this case:
63 *
64 * warning #32013: Invalid memory order specified. Defaulting to seq_cst memory order.
65 *
66 * while gcc acts silently.
67 *
68 * To mitigate the problem ALL functions, including the atomic<> members must be
69 * declared with BOOST_FORCEINLINE. In this case the compilers are able to see that
70 * all functions are called with constant orderings and call intrinstcts properly.
71 *
72 * Unfortunately, this still doesn't work in debug mode as the compiler doesn't
73 * inline functions even when marked with BOOST_FORCEINLINE. In this case all atomic
74 * operaions will be executed with seq_cst semantics.
75 */
convert_memory_order_to_gcc(memory_order order)76 BOOST_FORCEINLINE BOOST_CONSTEXPR int convert_memory_order_to_gcc(memory_order order) BOOST_NOEXCEPT
77 {
78 return (order == memory_order_relaxed ? __ATOMIC_RELAXED : (order == memory_order_consume ? __ATOMIC_CONSUME :
79 (order == memory_order_acquire ? __ATOMIC_ACQUIRE : (order == memory_order_release ? __ATOMIC_RELEASE :
80 (order == memory_order_acq_rel ? __ATOMIC_ACQ_REL : __ATOMIC_SEQ_CST)))));
81 }
82
83 template< typename T >
84 struct gcc_atomic_operations
85 {
86 typedef T storage_type;
87
storeboost::atomics::detail::gcc_atomic_operations88 static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
89 {
90 __atomic_store_n(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
91 }
92
loadboost::atomics::detail::gcc_atomic_operations93 static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
94 {
95 return __atomic_load_n(&storage, atomics::detail::convert_memory_order_to_gcc(order));
96 }
97
fetch_addboost::atomics::detail::gcc_atomic_operations98 static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
99 {
100 return __atomic_fetch_add(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
101 }
102
fetch_subboost::atomics::detail::gcc_atomic_operations103 static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
104 {
105 return __atomic_fetch_sub(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
106 }
107
exchangeboost::atomics::detail::gcc_atomic_operations108 static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
109 {
110 return __atomic_exchange_n(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
111 }
112
compare_exchange_strongboost::atomics::detail::gcc_atomic_operations113 static BOOST_FORCEINLINE bool compare_exchange_strong(
114 storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
115 {
116 return __atomic_compare_exchange_n
117 (
118 &storage, &expected, desired, false,
119 atomics::detail::convert_memory_order_to_gcc(success_order),
120 atomics::detail::convert_memory_order_to_gcc(failure_order)
121 );
122 }
123
compare_exchange_weakboost::atomics::detail::gcc_atomic_operations124 static BOOST_FORCEINLINE bool compare_exchange_weak(
125 storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
126 {
127 return __atomic_compare_exchange_n
128 (
129 &storage, &expected, desired, true,
130 atomics::detail::convert_memory_order_to_gcc(success_order),
131 atomics::detail::convert_memory_order_to_gcc(failure_order)
132 );
133 }
134
fetch_andboost::atomics::detail::gcc_atomic_operations135 static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
136 {
137 return __atomic_fetch_and(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
138 }
139
fetch_orboost::atomics::detail::gcc_atomic_operations140 static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
141 {
142 return __atomic_fetch_or(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
143 }
144
fetch_xorboost::atomics::detail::gcc_atomic_operations145 static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
146 {
147 return __atomic_fetch_xor(&storage, v, atomics::detail::convert_memory_order_to_gcc(order));
148 }
149
test_and_setboost::atomics::detail::gcc_atomic_operations150 static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
151 {
152 return __atomic_test_and_set(&storage, atomics::detail::convert_memory_order_to_gcc(order));
153 }
154
clearboost::atomics::detail::gcc_atomic_operations155 static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT
156 {
157 __atomic_clear(const_cast< storage_type* >(&storage), atomics::detail::convert_memory_order_to_gcc(order));
158 }
159
is_lock_freeboost::atomics::detail::gcc_atomic_operations160 static BOOST_FORCEINLINE bool is_lock_free(storage_type const volatile& storage) BOOST_NOEXCEPT
161 {
162 return __atomic_is_lock_free(sizeof(storage_type), &storage);
163 }
164 };
165
166 #if BOOST_ATOMIC_INT128_LOCK_FREE > 0
167 #if defined(__clang__) && defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG16B)
168
169 // Workaround for clang bug: http://llvm.org/bugs/show_bug.cgi?id=19149
170 // Clang 3.4 does not implement 128-bit __atomic* intrinsics even though it defines __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
171 template< bool Signed >
172 struct operations< 16u, Signed > :
173 public cas_based_operations< gcc_dcas_x86_64< Signed > >
174 {
175 };
176
177 #else
178
179 template< bool Signed >
180 struct operations< 16u, Signed > :
181 public gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >
182 {
183 };
184
185 #endif
186 #endif
187
188
189 #if BOOST_ATOMIC_INT64_LOCK_FREE > 0
190 #if defined(__clang__) && defined(BOOST_ATOMIC_DETAIL_X86_HAS_CMPXCHG8B)
191
192 // Workaround for clang bug http://llvm.org/bugs/show_bug.cgi?id=19355
193 template< bool Signed >
194 struct operations< 8u, Signed > :
195 public cas_based_operations< gcc_dcas_x86< Signed > >
196 {
197 };
198
199 #elif (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 8 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
200 (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 8 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
201 (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 8 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
202 (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 8 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
203 (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 8 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)
204
205 #define BOOST_ATOMIC_DETAIL_INT64_EXTENDED
206
207 template< bool Signed >
208 struct operations< 8u, Signed > :
209 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 8u, Signed >
210 {
211 };
212
213 #else
214
215 template< bool Signed >
216 struct operations< 8u, Signed > :
217 public gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >
218 {
219 };
220
221 #endif
222 #endif
223
224 #if BOOST_ATOMIC_INT32_LOCK_FREE > 0
225 #if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 4 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
226 (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 4 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
227 (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 4 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
228 (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 4 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
229 (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 4 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)
230
231 #define BOOST_ATOMIC_DETAIL_INT32_EXTENDED
232
233 #if !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
234
235 template< bool Signed >
236 struct operations< 4u, Signed > :
237 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 4u, Signed >
238 {
239 };
240
241 #else // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
242
243 template< bool Signed >
244 struct operations< 4u, Signed > :
245 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 4u, Signed >
246 {
247 };
248
249 #endif // !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
250
251 #else
252
253 template< bool Signed >
254 struct operations< 4u, Signed > :
255 public gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >
256 {
257 };
258
259 #endif
260 #endif
261
262 #if BOOST_ATOMIC_INT16_LOCK_FREE > 0
263 #if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 2 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
264 (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 2 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
265 (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 2 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
266 (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 2 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
267 (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 2 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE)
268
269 #define BOOST_ATOMIC_DETAIL_INT16_EXTENDED
270
271 #if !defined(BOOST_ATOMIC_DETAIL_INT32_EXTENDED)
272
273 template< bool Signed >
274 struct operations< 2u, Signed > :
275 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >, 2u, Signed >
276 {
277 };
278
279 #elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
280
281 template< bool Signed >
282 struct operations< 2u, Signed > :
283 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 2u, Signed >
284 {
285 };
286
287 #else
288
289 template< bool Signed >
290 struct operations< 2u, Signed > :
291 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 2u, Signed >
292 {
293 };
294
295 #endif
296
297 #else
298
299 template< bool Signed >
300 struct operations< 2u, Signed > :
301 public gcc_atomic_operations< typename make_storage_type< 2u, Signed >::type >
302 {
303 };
304
305 #endif
306 #endif
307
308 #if BOOST_ATOMIC_INT8_LOCK_FREE > 0
309 #if (BOOST_ATOMIC_DETAIL_SIZEOF_LLONG == 1 && __GCC_ATOMIC_LLONG_LOCK_FREE != BOOST_ATOMIC_LLONG_LOCK_FREE) ||\
310 (BOOST_ATOMIC_DETAIL_SIZEOF_LONG == 1 && __GCC_ATOMIC_LONG_LOCK_FREE != BOOST_ATOMIC_LONG_LOCK_FREE) ||\
311 (BOOST_ATOMIC_DETAIL_SIZEOF_INT == 1 && __GCC_ATOMIC_INT_LOCK_FREE != BOOST_ATOMIC_INT_LOCK_FREE) ||\
312 (BOOST_ATOMIC_DETAIL_SIZEOF_SHORT == 1 && __GCC_ATOMIC_SHORT_LOCK_FREE != BOOST_ATOMIC_SHORT_LOCK_FREE) ||\
313 (BOOST_ATOMIC_DETAIL_SIZEOF_WCHAR_T == 1 && __GCC_ATOMIC_WCHAR_T_LOCK_FREE != BOOST_ATOMIC_WCHAR_T_LOCK_FREE) ||\
314 (__GCC_ATOMIC_CHAR_LOCK_FREE != BOOST_ATOMIC_CHAR_LOCK_FREE) ||\
315 (__GCC_ATOMIC_BOOL_LOCK_FREE != BOOST_ATOMIC_BOOL_LOCK_FREE)
316
317 #if !defined(BOOST_ATOMIC_DETAIL_INT16_EXTENDED)
318
319 template< bool Signed >
320 struct operations< 1u, Signed > :
321 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 2u, Signed >::type >, 1u, Signed >
322 {
323 };
324
325 #elif !defined(BOOST_ATOMIC_DETAIL_INT32_EXTENDED)
326
327 template< bool Signed >
328 struct operations< 1u, Signed > :
329 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 4u, Signed >::type >, 1u, Signed >
330 {
331 };
332
333 #elif !defined(BOOST_ATOMIC_DETAIL_INT64_EXTENDED)
334
335 template< bool Signed >
336 struct operations< 1u, Signed > :
337 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 8u, Signed >::type >, 1u, Signed >
338 {
339 };
340
341 #else
342
343 template< bool Signed >
344 struct operations< 1u, Signed > :
345 public extending_cas_based_operations< gcc_atomic_operations< typename make_storage_type< 16u, Signed >::type >, 1u, Signed >
346 {
347 };
348
349 #endif
350
351 #else
352
353 template< bool Signed >
354 struct operations< 1u, Signed > :
355 public gcc_atomic_operations< typename make_storage_type< 1u, Signed >::type >
356 {
357 };
358
359 #endif
360 #endif
361
362 #undef BOOST_ATOMIC_DETAIL_INT16_EXTENDED
363 #undef BOOST_ATOMIC_DETAIL_INT32_EXTENDED
364 #undef BOOST_ATOMIC_DETAIL_INT64_EXTENDED
365
thread_fence(memory_order order)366 BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT
367 {
368 __atomic_thread_fence(atomics::detail::convert_memory_order_to_gcc(order));
369 }
370
signal_fence(memory_order order)371 BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT
372 {
373 __atomic_signal_fence(atomics::detail::convert_memory_order_to_gcc(order));
374 }
375
376 } // namespace detail
377 } // namespace atomics
378 } // namespace boost
379
380 #endif // BOOST_ATOMIC_DETAIL_OPS_GCC_ATOMIC_HPP_INCLUDED_
381