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)
212 "ldr %[tmp], [%[m]] \n"
213 "teq %[tmp], %[o] \n"
215 "ldrex %[tmp], [%[m]] \n"
216 "teq %[tmp], %[o] \n"
217 "strexeq %[res], %[n], [%[m]] \n"
221 : [tmp] "=&r" (tmp), [res] "=&r" (res), "+m" (*m)
222 : [n] "r" (n), [m] "r" (m), [o] "r" (o)
226 // res == 1 is failed
233 mp_cas2_arch(char *m, Mword o1, Mword o2, Mword n1, Mword n2)
235 register Mword _n1 asm("r6") = n1;
236 register Mword _n2 asm("r7") = n2;
237 register Mword tmp1 asm("r8");
238 register Mword tmp2 asm("r9");
244 "ldrd %[tmp1], [%[m]] \n"
245 "teq %[tmp1], %[o1] \n"
246 "teqeq %[tmp2], %[o2] \n"
248 "ldrexd %[tmp1], [%[m]] \n"
250 "teq %[tmp1], %[o1] \n"
251 "teqeq %[tmp2], %[o2] \n"
252 "strexdeq %[res], %[n1], [%[m]] \n"
256 : [tmp1] "=r" (tmp1), [tmp2] "=r" (tmp2),
257 [res] "=&r" (res), "+m" (*m), "+m" (*(m + 1))
258 : "0" (tmp1), "1" (tmp2),
259 [n1] "r" (_n1), "r" (_n2),
261 [o1] "r" (o1), [o2] "r" (o2)
267 //---------------------------------------------------------------------------
270 template< typename T > inline
272 mp_cas(T *m, T o, T n)
274 MACRO_CAS_ASSERT(sizeof(T),sizeof(Mword));
275 return mp_cas_arch(reinterpret_cast<Mword*>(m),
280 template< typename T, typename T2 > inline
282 mp_cas2(Pair<T,T2> *m, T o1, T2 o2, T n1, T2 n2)
284 MACRO_CAS_ASSERT(sizeof(T),sizeof(Mword));
285 MACRO_CAS_ASSERT(sizeof(T2),sizeof(Mword));
286 return mp_cas2_arch(reinterpret_cast<char *>(m),
294 //---------------------------------------------------------------------------
295 IMPLEMENTATION [!mp]:
297 template< typename T > inline
299 mp_cas(T *m, T o, T n)
300 { return cas(m,o,n); }