123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687 |
- #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_SYNC_HPP_INCLUDED
- #define BOOST_SMART_PTR_DETAIL_SPINLOCK_SYNC_HPP_INCLUDED
- #if defined(_MSC_VER) && (_MSC_VER >= 1020)
- # pragma once
- #endif
- #include <boost/smart_ptr/detail/yield_k.hpp>
- #if defined( __ia64__ ) && defined( __INTEL_COMPILER )
- # include <ia64intrin.h>
- #endif
- namespace boost
- {
- namespace detail
- {
- class spinlock
- {
- public:
- int v_;
- public:
- bool try_lock()
- {
- int r = __sync_lock_test_and_set( &v_, 1 );
- return r == 0;
- }
- void lock()
- {
- for( unsigned k = 0; !try_lock(); ++k )
- {
- boost::detail::yield( k );
- }
- }
- void unlock()
- {
- __sync_lock_release( &v_ );
- }
- public:
- class scoped_lock
- {
- private:
- spinlock & sp_;
- scoped_lock( scoped_lock const & );
- scoped_lock & operator=( scoped_lock const & );
- public:
- explicit scoped_lock( spinlock & sp ): sp_( sp )
- {
- sp.lock();
- }
- ~scoped_lock()
- {
- sp_.unlock();
- }
- };
- };
- }
- }
- #define BOOST_DETAIL_SPINLOCK_INIT {0}
- #endif
|