29 #ifndef _GLIBCXX_ATOMICITY_H
30 #define _GLIBCXX_ATOMICITY_H 1
33 #include <bits/gthr.h>
36 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
38 _GLIBCXX_BEGIN_NAMESPACE_VERSION
44 #ifdef _GLIBCXX_ATOMIC_BUILTINS
45 static inline _Atomic_word
46 __exchange_and_add(
volatile _Atomic_word* __mem,
int __val)
47 {
return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
50 __atomic_add(
volatile _Atomic_word* __mem,
int __val)
51 { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
54 __attribute__ ((__unused__))
55 __exchange_and_add(volatile _Atomic_word*,
int) throw ();
58 __attribute__ ((__unused__))
59 __atomic_add(volatile _Atomic_word*,
int) throw ();
62 static inline _Atomic_word
63 __exchange_and_add_single(_Atomic_word* __mem,
int __val)
65 _Atomic_word __result = *__mem;
71 __atomic_add_single(_Atomic_word* __mem,
int __val)
74 static inline _Atomic_word
75 __attribute__ ((__unused__))
76 __exchange_and_add_dispatch(_Atomic_word* __mem,
int __val)
79 if (__gthread_active_p())
80 return __exchange_and_add(__mem, __val);
82 return __exchange_and_add_single(__mem, __val);
84 return __exchange_and_add_single(__mem, __val);
89 __attribute__ ((__unused__))
90 __atomic_add_dispatch(_Atomic_word* __mem,
int __val)
93 if (__gthread_active_p())
94 __atomic_add(__mem, __val);
96 __atomic_add_single(__mem, __val);
98 __atomic_add_single(__mem, __val);
102 _GLIBCXX_END_NAMESPACE_VERSION
108 #ifndef _GLIBCXX_READ_MEM_BARRIER
109 #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
111 #ifndef _GLIBCXX_WRITE_MEM_BARRIER
112 #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")