2 * atomic.h: Atomic operations
5 * Dick Porter (dick@ximian.com)
7 * (C) 2002 Ximian, Inc.
8 * Copyright 2012 Xamarin Inc
11 #ifndef _WAPI_ATOMIC_H_
12 #define _WAPI_ATOMIC_H_
17 #ifdef ENABLE_EXTENSION_MODULE
18 #include "../../../mono-extensions/mono/utils/atomic.h"
21 /* On Windows, we always use the functions provided by the Windows API. */
22 #if defined(__WIN32__) || defined(_WIN32)
24 #ifndef WIN32_LEAN_AND_MEAN
25 #define WIN32_LEAN_AND_MEAN
28 #include <mono/utils/mono-membar.h>
30 /* mingw is missing InterlockedCompareExchange64 () from winbase.h */
31 #if HAVE_DECL_INTERLOCKEDCOMPAREEXCHANGE64==0
32 static inline gint64 InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp)
34 return __sync_val_compare_and_swap (dest, comp, exch);
38 /* mingw is missing InterlockedExchange64 () from winbase.h */
39 #if HAVE_DECL_INTERLOCKEDEXCHANGE64==0
40 static inline gint64 InterlockedExchange64(volatile gint64 *val, gint64 new_val)
45 } while (InterlockedCompareExchange64 (val, new_val, old_val) != old_val);
50 /* mingw is missing InterlockedIncrement64 () from winbase.h */
51 #if HAVE_DECL_INTERLOCKEDINCREMENT64==0
52 static inline gint64 InterlockedIncrement64(volatile gint64 *val)
54 return __sync_add_and_fetch (val, 1);
58 /* mingw is missing InterlockedDecrement64 () from winbase.h */
59 #if HAVE_DECL_INTERLOCKEDDECREMENT64==0
60 static inline gint64 InterlockedDecrement64(volatile gint64 *val)
62 return __sync_sub_and_fetch (val, 1);
66 /* mingw is missing InterlockedAdd () from winbase.h */
67 #if HAVE_DECL_INTERLOCKEDADD==0
68 static inline gint32 InterlockedAdd(volatile gint32 *dest, gint32 add)
70 return __sync_add_and_fetch (dest, add);
74 /* mingw is missing InterlockedAdd64 () from winbase.h */
75 #if HAVE_DECL_INTERLOCKEDADD64==0
76 static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
78 return __sync_add_and_fetch (dest, add);
82 #if defined(_MSC_VER) && !defined(InterlockedAdd)
83 /* MSVC before 2013 only defines InterlockedAdd* for the Itanium architecture */
84 static inline gint32 InterlockedAdd(volatile gint32 *dest, gint32 add)
86 return InterlockedExchangeAdd (dest, add) + add;
90 #if defined(_MSC_VER) && !defined(InterlockedAdd64)
91 #if defined(InterlockedExchangeAdd64)
92 /* This may be defined only on amd64 */
93 static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
95 return InterlockedExchangeAdd64 (dest, add) + add;
98 static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
104 } while (prev_value != InterlockedCompareExchange64(dest, prev_value + add, prev_value));
106 return prev_value + add;
111 /* And now for some dirty hacks... The Windows API doesn't
112 * provide any useful primitives for this (other than getting
113 * into architecture-specific madness), so use CAS. */
115 static inline gint32 InterlockedRead(volatile gint32 *src)
117 return InterlockedCompareExchange (src, 0, 0);
120 static inline gint64 InterlockedRead64(volatile gint64 *src)
122 return InterlockedCompareExchange64 (src, 0, 0);
125 static inline gpointer InterlockedReadPointer(volatile gpointer *src)
127 return InterlockedCompareExchangePointer (src, NULL, NULL);
130 static inline void InterlockedWrite(volatile gint32 *dst, gint32 val)
132 InterlockedExchange (dst, val);
135 static inline void InterlockedWrite64(volatile gint64 *dst, gint64 val)
137 InterlockedExchange64 (dst, val);
140 static inline void InterlockedWritePointer(volatile gpointer *dst, gpointer val)
142 InterlockedExchangePointer (dst, val);
145 /* We can't even use CAS for these, so write them out
146 * explicitly according to x86(_64) semantics... */
148 static inline gint8 InterlockedRead8(volatile gint8 *src)
153 static inline gint16 InterlockedRead16(volatile gint16 *src)
158 static inline void InterlockedWrite8(volatile gint8 *dst, gint8 val)
161 mono_memory_barrier ();
164 static inline void InterlockedWrite16(volatile gint16 *dst, gint16 val)
167 mono_memory_barrier ();
170 /* Prefer GCC atomic ops if the target supports it (see configure.in). */
171 #elif defined(USE_GCC_ATOMIC_OPS)
173 static inline gint32 InterlockedCompareExchange(volatile gint32 *dest,
174 gint32 exch, gint32 comp)
176 return __sync_val_compare_and_swap (dest, comp, exch);
179 static inline gpointer InterlockedCompareExchangePointer(volatile gpointer *dest, gpointer exch, gpointer comp)
181 return __sync_val_compare_and_swap (dest, comp, exch);
184 static inline gint32 InterlockedAdd(volatile gint32 *dest, gint32 add)
186 return __sync_add_and_fetch (dest, add);
189 static inline gint32 InterlockedIncrement(volatile gint32 *val)
191 return __sync_add_and_fetch (val, 1);
194 static inline gint32 InterlockedDecrement(volatile gint32 *val)
196 return __sync_sub_and_fetch (val, 1);
199 static inline gint32 InterlockedExchange(volatile gint32 *val, gint32 new_val)
204 } while (__sync_val_compare_and_swap (val, old_val, new_val) != old_val);
208 static inline gpointer InterlockedExchangePointer(volatile gpointer *val,
214 } while (__sync_val_compare_and_swap (val, old_val, new_val) != old_val);
218 static inline gint32 InterlockedExchangeAdd(volatile gint32 *val, gint32 add)
220 return __sync_fetch_and_add (val, add);
223 static inline gint8 InterlockedRead8(volatile gint8 *src)
225 /* Kind of a hack, but GCC doesn't give us anything better, and it's
226 * certainly not as bad as using a CAS loop. */
227 return __sync_fetch_and_add (src, 0);
230 static inline gint16 InterlockedRead16(volatile gint16 *src)
232 return __sync_fetch_and_add (src, 0);
235 static inline gint32 InterlockedRead(volatile gint32 *src)
237 return __sync_fetch_and_add (src, 0);
240 static inline void InterlockedWrite8(volatile gint8 *dst, gint8 val)
242 /* Nothing useful from GCC at all, so fall back to CAS. */
246 } while (__sync_val_compare_and_swap (dst, old_val, val) != old_val);
249 static inline void InterlockedWrite16(volatile gint16 *dst, gint16 val)
254 } while (__sync_val_compare_and_swap (dst, old_val, val) != old_val);
257 static inline void InterlockedWrite(volatile gint32 *dst, gint32 val)
259 /* Nothing useful from GCC at all, so fall back to CAS. */
263 } while (__sync_val_compare_and_swap (dst, old_val, val) != old_val);
266 #if defined (TARGET_OSX) || defined (__arm__) || (defined (__mips__) && !defined (__mips64)) || (defined (__powerpc__) && !defined (__powerpc64__)) || (defined (__sparc__) && !defined (__arch64__))
267 #define BROKEN_64BIT_ATOMICS_INTRINSIC 1
270 #if !defined (BROKEN_64BIT_ATOMICS_INTRINSIC)
272 static inline gint64 InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp)
274 return __sync_val_compare_and_swap (dest, comp, exch);
277 static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
279 return __sync_add_and_fetch (dest, add);
282 static inline gint64 InterlockedIncrement64(volatile gint64 *val)
284 return __sync_add_and_fetch (val, 1);
287 static inline gint64 InterlockedDecrement64(volatile gint64 *val)
289 return __sync_sub_and_fetch (val, 1);
292 static inline gint64 InterlockedExchangeAdd64(volatile gint64 *val, gint64 add)
294 return __sync_fetch_and_add (val, add);
297 static inline gint64 InterlockedRead64(volatile gint64 *src)
299 /* Kind of a hack, but GCC doesn't give us anything better. */
300 return __sync_fetch_and_add (src, 0);
305 /* Implement 64-bit cmpxchg by hand or emulate it. */
306 extern gint64 InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp);
308 /* Implement all other 64-bit atomics in terms of a specialized CAS
309 * in this case, since chances are that the other 64-bit atomic
310 * intrinsics are broken too.
313 static inline gint64 InterlockedExchangeAdd64(volatile gint64 *dest, gint64 add)
318 } while (InterlockedCompareExchange64 (dest, old_val + add, old_val) != old_val);
322 static inline gint64 InterlockedIncrement64(volatile gint64 *val)
328 } while (InterlockedCompareExchange64 (val, set, get) != get);
332 static inline gint64 InterlockedDecrement64(volatile gint64 *val)
338 } while (InterlockedCompareExchange64 (val, set, get) != get);
342 static inline gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add)
348 } while (InterlockedCompareExchange64 (dest, set, get) != get);
352 static inline gint64 InterlockedRead64(volatile gint64 *src)
354 return InterlockedCompareExchange64 (src, 0, 0);
359 static inline gpointer InterlockedReadPointer(volatile gpointer *src)
361 return InterlockedCompareExchangePointer (src, NULL, NULL);
364 static inline void InterlockedWritePointer(volatile gpointer *dst, gpointer val)
366 InterlockedExchangePointer (dst, val);
369 /* We always implement this in terms of a 64-bit cmpxchg since
370 * GCC doesn't have an intrisic to model it anyway. */
371 static inline gint64 InterlockedExchange64(volatile gint64 *val, gint64 new_val)
376 } while (InterlockedCompareExchange64 (val, new_val, old_val) != old_val);
380 static inline void InterlockedWrite64(volatile gint64 *dst, gint64 val)
382 /* Nothing useful from GCC at all, so fall back to CAS. */
383 InterlockedExchange64 (dst, val);
386 #elif defined(__ia64__)
388 #ifdef __INTEL_COMPILER
389 #include <ia64intrin.h>
392 static inline gint32 InterlockedCompareExchange(gint32 volatile *dest,
393 gint32 exch, gint32 comp)
398 #ifdef __INTEL_COMPILER
399 old = _InterlockedCompareExchange (dest, exch, comp);
401 /* cmpxchg4 zero extends the value read from memory */
402 real_comp = (guint64)(guint32)comp;
403 asm volatile ("mov ar.ccv = %2 ;;\n\t"
404 "cmpxchg4.acq %0 = [%1], %3, ar.ccv\n\t"
405 : "=r" (old) : "r" (dest), "r" (real_comp), "r" (exch));
411 static inline gpointer InterlockedCompareExchangePointer(gpointer volatile *dest,
412 gpointer exch, gpointer comp)
416 #ifdef __INTEL_COMPILER
417 old = _InterlockedCompareExchangePointer (dest, exch, comp);
419 asm volatile ("mov ar.ccv = %2 ;;\n\t"
420 "cmpxchg8.acq %0 = [%1], %3, ar.ccv\n\t"
421 : "=r" (old) : "r" (dest), "r" (comp), "r" (exch));
427 static inline gint32 InterlockedIncrement(gint32 volatile *val)
429 #ifdef __INTEL_COMPILER
430 return _InterlockedIncrement (val);
436 } while (InterlockedCompareExchange (val, old + 1, old) != old);
442 static inline gint32 InterlockedDecrement(gint32 volatile *val)
444 #ifdef __INTEL_COMPILER
445 return _InterlockedDecrement (val);
451 } while (InterlockedCompareExchange (val, old - 1, old) != old);
457 static inline gint32 InterlockedExchange(gint32 volatile *dest, gint32 new_val)
459 #ifdef __INTEL_COMPILER
460 return _InterlockedExchange (dest, new_val);
466 } while (InterlockedCompareExchange (dest, new_val, res) != res);
472 static inline gpointer InterlockedExchangePointer(gpointer volatile *dest, gpointer new_val)
474 #ifdef __INTEL_COMPILER
475 return (gpointer)_InterlockedExchange64 ((gint64*)dest, (gint64)new_val);
481 } while (InterlockedCompareExchangePointer (dest, new_val, res) != res);
487 static inline gint32 InterlockedExchangeAdd(gint32 volatile *val, gint32 add)
491 #ifdef __INTEL_COMPILER
492 old = _InterlockedExchangeAdd (val, add);
496 } while (InterlockedCompareExchange (val, old + add, old) != old);
504 #define WAPI_NO_ATOMIC_ASM
506 extern gint32 InterlockedCompareExchange(volatile gint32 *dest, gint32 exch, gint32 comp);
507 extern gint64 InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp);
508 extern gpointer InterlockedCompareExchangePointer(volatile gpointer *dest, gpointer exch, gpointer comp);
509 extern gint32 InterlockedAdd(volatile gint32 *dest, gint32 add);
510 extern gint64 InterlockedAdd64(volatile gint64 *dest, gint64 add);
511 extern gint32 InterlockedIncrement(volatile gint32 *dest);
512 extern gint64 InterlockedIncrement64(volatile gint64 *dest);
513 extern gint32 InterlockedDecrement(volatile gint32 *dest);
514 extern gint64 InterlockedDecrement64(volatile gint64 *dest);
515 extern gint32 InterlockedExchange(volatile gint32 *dest, gint32 exch);
516 extern gint64 InterlockedExchange64(volatile gint64 *dest, gint64 exch);
517 extern gpointer InterlockedExchangePointer(volatile gpointer *dest, gpointer exch);
518 extern gint32 InterlockedExchangeAdd(volatile gint32 *dest, gint32 add);
519 extern gint64 InterlockedExchangeAdd64(volatile gint64 *dest, gint64 add);
520 extern gint8 InterlockedRead8(volatile gint8 *src);
521 extern gint16 InterlockedRead16(volatile gint16 *src);
522 extern gint32 InterlockedRead(volatile gint32 *src);
523 extern gint64 InterlockedRead64(volatile gint64 *src);
524 extern gpointer InterlockedReadPointer(volatile gpointer *src);
525 extern void InterlockedWrite8(volatile gint8 *dst, gint8 val);
526 extern void InterlockedWrite16(volatile gint16 *dst, gint16 val);
527 extern void InterlockedWrite(volatile gint32 *dst, gint32 val);
528 extern void InterlockedWrite64(volatile gint64 *dst, gint64 val);
529 extern void InterlockedWritePointer(volatile gpointer *dst, gpointer val);
533 #endif /* _WAPI_ATOMIC_H_ */