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Contemplating this <atomic> reorganization...

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@115087 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2010-09-29 21:20:03 +00:00
parent 5b6af69387
commit 767ae2b483
2 changed files with 201 additions and 38 deletions
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237
include/atomic
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@ -2415,6 +2415,85 @@ void atomic_signal_fence(memory_order);
#pragma GCC system_header
// Begin "Intrinsics"
inline _LIBCPP_INLINE_VISIBILITY
bool
__test_and_set_relaxed(volatile bool* __b)
{
return __sync_lock_test_and_set(__b, true);
}
inline _LIBCPP_INLINE_VISIBILITY
bool
__test_and_set_consume(volatile bool* __b)
{
return __sync_lock_test_and_set(__b, true);
}
inline _LIBCPP_INLINE_VISIBILITY
bool
__test_and_set_acquire(volatile bool* __b)
{
return __sync_lock_test_and_set(__b, true);
}
inline _LIBCPP_INLINE_VISIBILITY
bool
__test_and_set_release(volatile bool* __b)
{
__sync_synchronize();
return __sync_lock_test_and_set(__b, true);
}
inline _LIBCPP_INLINE_VISIBILITY
bool
__test_and_set_acq_rel(volatile bool* __b)
{
__sync_synchronize();
return __sync_lock_test_and_set(__b, true);
}
inline _LIBCPP_INLINE_VISIBILITY
bool
__test_and_set_seq_cst(volatile bool* __b)
{
__sync_synchronize();
return __sync_lock_test_and_set(__b, true);
}
inline _LIBCPP_INLINE_VISIBILITY
void
__atomic_store_relaxed(volatile bool* __b, bool __x)
{
__sync_lock_test_and_set(__b, __x);
}
inline _LIBCPP_INLINE_VISIBILITY
void
__atomic_store_consume(volatile bool* __b, bool __x)
{
__sync_lock_test_and_set(__b, __x);
}
inline _LIBCPP_INLINE_VISIBILITY
void
__atomic_store_release(volatile bool* __b, bool __x)
{
__sync_synchronize();
__sync_lock_test_and_set(__b, __x);
}
inline _LIBCPP_INLINE_VISIBILITY
void
__atomic_store_seq_cst(volatile bool* __b, bool __x)
{
__sync_synchronize();
__sync_lock_test_and_set(__b, __x);
}
// End "Intrinsics"
_LIBCPP_BEGIN_NAMESPACE_STD
typedef enum memory_order
@ -2433,42 +2512,54 @@ kill_dependency(_Tp __y)
// flag type and operations
struct __atomic_flag_init {};
struct atomic_flag;
typedef struct atomic_flag
bool atomic_flag_test_and_set(volatile atomic_flag*);
bool atomic_flag_test_and_set(atomic_flag*);
bool atomic_flag_test_and_set_explicit(volatile atomic_flag*, memory_order);
bool atomic_flag_test_and_set_explicit(atomic_flag*, memory_order);
void atomic_flag_clear(volatile atomic_flag*);
void atomic_flag_clear(atomic_flag*);
void atomic_flag_clear_explicit(volatile atomic_flag*, memory_order);
void atomic_flag_clear_explicit(atomic_flag*, memory_order);
typedef struct _LIBCPP_VISIBLE atomic_flag
{
bool __flg_;
bool test_and_set(memory_order __o = memory_order_seq_cst) volatile
{
switch (__o)
{
case memory_order_relaxed:
case memory_order_consume:
case memory_order_acquire:
return __sync_lock_test_and_set(&__flg_, true);
case memory_order_release:
case memory_order_acq_rel:
case memory_order_seq_cst:
bool __r = __sync_lock_test_and_set(&__flg_, true);
__sync_synchronize();
return __r;
}
}
_LIBCPP_INLINE_VISIBILITY
bool test_and_set() volatile
{return atomic_flag_test_and_set(this);}
_LIBCPP_INLINE_VISIBILITY
bool test_and_set(memory_order __o) volatile
{return atomic_flag_test_and_set_explicit(this, __o);}
_LIBCPP_INLINE_VISIBILITY
bool test_and_set()
{return atomic_flag_test_and_set(this);}
_LIBCPP_INLINE_VISIBILITY
bool test_and_set(memory_order __o)
{return atomic_flag_test_and_set_explicit(this, __o);}
bool test_and_set(memory_order __o = memory_order_seq_cst)
{return const_cast<volatile atomic_flag*>(this)->test_and_set(__o);}
void clear(memory_order = memory_order_seq_cst) volatile;
void clear(memory_order = memory_order_seq_cst);
_LIBCPP_INLINE_VISIBILITY
void clear() volatile
{atomic_flag_clear(this);}
_LIBCPP_INLINE_VISIBILITY
void clear(memory_order __o) volatile
{atomic_flag_clear_explicit(this, __o);}
_LIBCPP_INLINE_VISIBILITY
void clear()
{atomic_flag_clear(this);}
_LIBCPP_INLINE_VISIBILITY
void clear(memory_order __o)
{atomic_flag_clear_explicit(this, __o);}
#ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
atomic_flag() = default;
#else
atomic_flag() {};
_LIBCPP_INLINE_VISIBILITY
atomic_flag() : __flg_(false) {};
#endif
#if 0
#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
atomic_flag(const atomic_flag&) = delete;
atomic_flag& operator=(const atomic_flag&) = delete;
@ -2480,21 +2571,93 @@ private:
atomic_flag& operator=(const atomic_flag&) volatile;
public:
#endif
#else
atomic_flag(__atomic_flag_init) : __flg_(false) {} // temporary
#endif
} atomic_flag;
bool atomic_flag_test_and_set(volatile atomic_flag*);
bool atomic_flag_test_and_set(atomic_flag*);
bool atomic_flag_test_and_set_explicit(volatile atomic_flag*, memory_order);
bool atomic_flag_test_and_set_explicit(atomic_flag*, memory_order);
void atomic_flag_clear(volatile atomic_flag*);
void atomic_flag_clear(atomic_flag*);
void atomic_flag_clear_explicit(volatile atomic_flag*, memory_order);
void atomic_flag_clear_explicit(atomic_flag*, memory_order);
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set(volatile atomic_flag* __f)
{
return __test_and_set_seq_cst(&__f->__flg_);
}
#define ATOMIC_FLAG_INIT _STD::__atomic_flag_init()
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set(atomic_flag* __f)
{
return atomic_flag_test_and_set(const_cast<volatile atomic_flag*>(__f));
}
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set_explicit(volatile atomic_flag* __f, memory_order __o)
{
switch (__o)
{
case memory_order_relaxed:
return __test_and_set_relaxed(&__f->__flg_);
case memory_order_consume:
return __test_and_set_consume(&__f->__flg_);
case memory_order_acquire:
return __test_and_set_acquire(&__f->__flg_);
case memory_order_release:
return __test_and_set_release(&__f->__flg_);
case memory_order_acq_rel:
return __test_and_set_acq_rel(&__f->__flg_);
case memory_order_seq_cst:
return __test_and_set_seq_cst(&__f->__flg_);
}
}
inline _LIBCPP_INLINE_VISIBILITY
bool
atomic_flag_test_and_set_explicit(atomic_flag* __f, memory_order __o)
{
return atomic_flag_test_and_set_explicit(const_cast<volatile atomic_flag*>(__f), __o);
}
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear(volatile atomic_flag* __f)
{
return __atomic_store_seq_cst(&__f->__flg_, false);
}
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear(atomic_flag* __f)
{
atomic_flag_clear(const_cast<volatile atomic_flag*>(__f));
}
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear_explicit(volatile atomic_flag* __f, memory_order __o)
{
switch (__o)
{
case memory_order_relaxed:
__atomic_store_relaxed(&__f->__flg_, false);
break;
case memory_order_consume:
__atomic_store_consume(&__f->__flg_, false);
break;
case memory_order_release:
__atomic_store_release(&__f->__flg_, false);
break;
case memory_order_seq_cst:
__atomic_store_seq_cst(&__f->__flg_, false);
break;
}
}
inline _LIBCPP_INLINE_VISIBILITY
void
atomic_flag_clear_explicit(atomic_flag* __f, memory_order __o)
{
atomic_flag_clear_explicit(const_cast<volatile atomic_flag*>(__f), __o);
}
#define ATOMIC_FLAG_INIT {false}
_LIBCPP_END_NAMESPACE_STD

2
test/atomics/atomics.flag/test_and_set.pass.cpp
View File

@ -19,7 +19,7 @@
int main()
{
std::atomic_flag f = ATOMIC_FLAG_INIT;
std::atomic_flag f;
assert(f.test_and_set() == 0);
assert(f.test_and_set() == 1);
}