5 extern "C" void cas_error_type_with_bad_size_used(void);
7 #define MACRO_CAS_ASSERT(rs,cs) \
9 cas_error_type_with_bad_size_used()
12 template< typename A, typename B >
19 Pair(A const &a, B const &b) : first(a), second(b) {}
23 //---------------------------------------------------------------------------
26 template< typename Type > inline
28 cas (Type *ptr, Type oldval, Type newval)
30 MACRO_CAS_ASSERT(sizeof(Type),sizeof(Mword));
31 return cas_unsafe (reinterpret_cast<Mword*>(ptr),
32 (Mword)oldval, (Mword)newval);
35 template< typename Type > inline
37 cas2 (Type *ptr, Type *oldval, Type *newval)
39 MACRO_CAS_ASSERT(sizeof(Type),(sizeof(Mword)*2));
40 return cas2_unsafe (reinterpret_cast<Mword*>(ptr),
41 reinterpret_cast<Mword*>(oldval),
42 reinterpret_cast<Mword*>(newval));
45 template <typename T> inline
47 atomic_change(T *ptr, T mask, T bits)
54 while (! cas (ptr, old, (old & mask) | bits));
58 //---------------------------------------------------------------------------
59 IMPLEMENTATION [ia32,ux]:
63 atomic_mp_add (Mword *l, Mword value)
65 asm volatile ("lock; addl %1, %2" : "=m"(*l) : "ir"(value), "m"(*l));
70 atomic_add (Mword *l, Mword value)
72 asm volatile ("addl %1, %2" : "=m"(*l) : "ir"(value), "m"(*l));
77 atomic_and (Mword *l, Mword mask)
79 asm volatile ("andl %1, %2" : "=m"(*l) : "ir"(mask), "m"(*l));
84 atomic_or (Mword *l, Mword bits)
86 asm volatile ("orl %1, %2" : "=m"(*l) : "ir"(bits), "m"(*l));
89 // ``unsafe'' stands for no safety according to the size of the given type.
90 // There are type safe versions of the cas operations in the architecture
91 // independent part of atomic that use the unsafe versions and make a type
96 cas_unsafe (Mword *ptr, Mword oldval, Mword newval)
103 : "r" (newval), "m" (*ptr), "a" (oldval)
106 return tmp == oldval;
112 mp_cas_arch(Mword *m, Mword o, Mword n)
117 ("lock; cmpxchgl %1, %2"
119 : "r" (n), "m" (*m), "a" (o)
127 cas2_unsafe (Mword *ptr, Mword *oldval, Mword *newval)
131 ("cmpxchg8b %3 ; sete %%cl"
136 "a" (* oldval), "d" (*(oldval+1)),
137 "b" (* newval), "c" (*(newval+1))
145 mp_cas2_arch (char *m, Mword o1, Mword o2, Mword n1, Mword n2)
149 ("lock; cmpxchg8b %3 ; sete %%cl"
150 : "=c" (ret), "=a" (o1), "=d" (o2)
151 : "m" (*m), "a" (o1), "d" (o2),
162 asm volatile ("xchg %0, %1" : "=r"(tmp) : "m"(*l), "0"(1) : "memory");
166 //---------------------------------------------------------------------------
167 IMPLEMENTATION[(ppc32 && !mp) || (arm && !armv6plus)]:
169 #include "processor.h"
171 inline NEEDS["processor.h"]
173 atomic_mp_add (Mword *l, Mword value)
175 Proc::Status s = Proc::cli_save();
177 Proc::sti_restore(s);
181 //---------------------------------------------------------------------------
182 IMPLEMENTATION[arm && armv6plus]:
186 atomic_mp_add (Mword *l, Mword value)
192 "ldrex %[v], [%[mem]] \n"
193 "add %[v], %[v], %[addval] \n"
194 "strex %[ret], %[v], [%[mem]] \n"
197 : [v] "=&r" (tmp), [ret] "=&r" (ret), "+m" (*l)
198 : [mem] "r" (l), [addval] "r" (value)
205 mp_cas_arch(Mword *m, Mword o, Mword n)
210 ("ldrex %[tmp], [%[m]] \n"
212 "teq %[tmp], %[o] \n"
213 "strexeq %[res], %[n], [%[m]] \n"
214 : [tmp] "=&r" (tmp), [res] "=&r" (res), "+m" (*m)
215 : [n] "r" (n), [m] "r" (m), [o] "r" (o)
219 // res == 1 is failed
226 mp_cas2_arch (char *m, Mword o1, Mword o2, Mword n1, Mword n2)
228 register Mword _n1 asm("r6") = n1;
229 register Mword _n2 asm("r7") = n2;
230 register Mword tmp1 asm("r8");
231 register Mword tmp2 asm("r9");
235 ("ldrexd %[tmp1], [%[m]] \n"
237 "teq %[tmp1], %[o1] \n"
238 "teqeq %[tmp2], %[o2] \n"
239 "strexdeq %[res], %[n1], [%[m]] \n"
240 : [tmp1] "=r" (tmp1), [tmp2] "=r" (tmp2),
241 [res] "=&r" (res), "+m" (*m), "+m" (*(m + 1))
242 : "0" (tmp1), "1" (tmp2),
243 [n1] "r" (_n1), "r" (_n2),
245 [o1] "r" (o1), [o2] "r" (o2)
251 //---------------------------------------------------------------------------
254 template< typename T > inline
256 mp_cas (T *m, T o, T n)
258 MACRO_CAS_ASSERT(sizeof(T),sizeof(Mword));
259 return mp_cas_arch(reinterpret_cast<Mword*>(m),
264 template< typename T, typename T2 > inline
266 mp_cas2 (Pair<T,T2> *m, T o1, T2 o2, T n1, T2 n2)
268 MACRO_CAS_ASSERT(sizeof(T),sizeof(Mword));
269 MACRO_CAS_ASSERT(sizeof(T2),sizeof(Mword));
270 return mp_cas2_arch(reinterpret_cast<char *>(m),
278 //---------------------------------------------------------------------------
279 IMPLEMENTATION [!mp]:
281 template< typename T > inline
283 mp_cas (T *m, T o, T n)
284 { return cas(m,o,n); }