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Merge [76119] to release. Refs #6308.

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[SVN r76120]
This commit is contained in:
Peter Dimov
2011-12-23 15:10:51 +00:00
parent 90db9a6435
commit d1348ea05e
1 changed files with 38 additions and 10 deletions
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48
include/boost/smart_ptr/detail/sp_counted_base_aix.hpp
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@ -26,6 +26,39 @@
namespace boost
{
inline void atomic_increment( int32_t* pw )
{
// ++*pw;
fetch_and_add( pw, 1 );
}
inline int32_t atomic_decrement( int32_t * pw )
{
// return --*pw;
int32_t originalValue;
__asm__ __volatile__( "sync" );
originalValue = fetch_and_add( pw, -1 );
__asm__ __volatile__( "isync" );
return (originalValue - 1);
}
inline int32_t atomic_conditional_increment( int32_t * pw )
{
// if( *pw != 0 ) ++*pw;
// return *pw;
int32_t tmp = fetch_and_add( pw, 0 );
for( ;; )
{
if( tmp == 0 ) return 0;
if( compare_and_swap( pw, &tmp, tmp + 1 ) ) return (tmp + 1);
}
}
namespace detail
{
@ -65,22 +98,17 @@ public:
void add_ref_copy()
{
fetch_and_add( &use_count_, 1 );
atomic_increment( &use_count_ );
}
bool add_ref_lock() // true on success
{
int32_t tmp = fetch_and_add( &use_count_, 0 );
for( ;; )
{
if( tmp == 0 ) return false;
if( compare_and_swap( &use_count_, &tmp, tmp + 1 ) ) return true;
}
return atomic_conditional_increment( &use_count_ ) != 0;
}
void release() // nothrow
{
if( fetch_and_add( &use_count_, -1 ) == 1 )
if( atomic_decrement( &use_count_ ) == 0 )
{
dispose();
weak_release();
@ -89,12 +117,12 @@ public:
void weak_add_ref() // nothrow
{
fetch_and_add( &weak_count_, 1 );
atomic_increment( &weak_count_ );
}
void weak_release() // nothrow
{
if( fetch_and_add( &weak_count_, -1 ) == 1 )
if( atomic_decrement( &weak_count_ ) == 0 )
{
destroy();
}