namespace std
{
-
-// Class _Refcount_Base provides a type, _RC_t, a data member,
-// _M_ref_count, and member functions _M_incr and _M_decr, which perform
-// atomic preincrement/predecrement. The constructor initializes
-// _M_ref_count.
-struct _Refcount_Base
-{
- // The type _RC_t
- typedef size_t _RC_t;
-
- // The data member _M_ref_count
- volatile _RC_t _M_ref_count;
-
- // Constructor
- __gthread_mutex_t _M_ref_count_lock;
- _Refcount_Base(_RC_t __n) : _M_ref_count(__n)
+ // Class _Refcount_Base provides a type, _RC_t, a data member,
+ // _M_ref_count, and member functions _M_incr and _M_decr, which perform
+ // atomic preincrement/predecrement. The constructor initializes
+ // _M_ref_count.
+ struct _Refcount_Base
+ {
+ // The type _RC_t
+ typedef size_t _RC_t;
+
+ // The data member _M_ref_count
+ volatile _RC_t _M_ref_count;
+
+ // Constructor
+ __gthread_mutex_t _M_ref_count_lock;
+
+ _Refcount_Base(_RC_t __n) : _M_ref_count(__n)
{
#ifdef __GTHREAD_MUTEX_INIT
__gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
#endif
}
- void _M_incr() {
- __gthread_mutex_lock(&_M_ref_count_lock);
- ++_M_ref_count;
- __gthread_mutex_unlock(&_M_ref_count_lock);
- }
- _RC_t _M_decr() {
- __gthread_mutex_lock(&_M_ref_count_lock);
- volatile _RC_t __tmp = --_M_ref_count;
- __gthread_mutex_unlock(&_M_ref_count_lock);
- return __tmp;
- }
-};
+ void
+ _M_incr()
+ {
+ __gthread_mutex_lock(&_M_ref_count_lock);
+ ++_M_ref_count;
+ __gthread_mutex_unlock(&_M_ref_count_lock);
+ }
-// Atomic swap on unsigned long
-// This is guaranteed to behave as though it were atomic only if all
-// possibly concurrent updates use _Atomic_swap.
-// In some cases the operation is emulated with a lock.
+ _RC_t
+ _M_decr()
+ {
+ __gthread_mutex_lock(&_M_ref_count_lock);
+ volatile _RC_t __tmp = --_M_ref_count;
+ __gthread_mutex_unlock(&_M_ref_count_lock);
+ return __tmp;
+ }
+ };
+
+ // Atomic swap on unsigned long
+ // This is guaranteed to behave as though it were atomic only if all
+ // possibly concurrent updates use _Atomic_swap.
+ // In some cases the operation is emulated with a lock.
#if defined (__GTHREAD_MUTEX_INIT)
-// This could be optimized to use the atomicity.h abstraction layer.
-// vyzo: simple _Atomic_swap implementation following the guidelines above
- // We use a template here only to get a unique initialized instance.
- template<int __dummy>
- struct _Swap_lock_struct {
- static __gthread_mutex_t _S_swap_lock;
- };
-
- template<int __dummy>
+ // This could be optimized to use the atomicity.h abstraction layer.
+ // vyzo: simple _Atomic_swap implementation following the guidelines above
+ // We use a template here only to get a unique initialized instance.
+ template<int __dummy>
+ struct _Swap_lock_struct
+ { static __gthread_mutex_t _S_swap_lock; };
+
+ template<int __dummy>
__gthread_mutex_t
_Swap_lock_struct<__dummy>::_S_swap_lock = __GTHREAD_MUTEX_INIT;
- // This should be portable, but performance is expected
- // to be quite awful. This really needs platform specific
- // code.
- inline unsigned long _Atomic_swap(unsigned long * __p, unsigned long __q) {
- __gthread_mutex_lock(&_Swap_lock_struct<0>::_S_swap_lock);
- unsigned long __result = *__p;
- *__p = __q;
- __gthread_mutex_unlock(&_Swap_lock_struct<0>::_S_swap_lock);
- return __result;
- }
+ // This should be portable, but performance is expected to be quite
+ // awful. This really needs platform specific code.
+ inline unsigned long
+ _Atomic_swap(unsigned long * __p, unsigned long __q)
+ {
+ __gthread_mutex_lock(&_Swap_lock_struct<0>::_S_swap_lock);
+ unsigned long __result = *__p;
+ *__p = __q;
+ __gthread_mutex_unlock(&_Swap_lock_struct<0>::_S_swap_lock);
+ return __result;
+ }
#endif
-// Locking class. Note that this class *does not have a constructor*.
-// It must be initialized either statically, with __STL_MUTEX_INITIALIZER,
-// or dynamically, by explicitly calling the _M_initialize member function.
-// (This is similar to the ways that a pthreads mutex can be initialized.)
-// There are explicit member functions for acquiring and releasing the lock.
+ // Locking class. Note that this class *does not have a
+ // constructor*. It must be initialized either statically, with
+ // __STL_MUTEX_INITIALIZER, or dynamically, by explicitly calling
+ // the _M_initialize member function. (This is similar to the ways
+ // that a pthreads mutex can be initialized.) There are explicit
+ // member functions for acquiring and releasing the lock.
-// There is no constructor because static initialization is essential for
-// some uses, and only a class aggregate (see section 8.5.1 of the C++
-// standard) can be initialized that way. That means we must have no
-// constructors, no base classes, no virtual functions, and no private or
-// protected members.
+ // There is no constructor because static initialization is
+ // essential for some uses, and only a class aggregate (see section
+ // 8.5.1 of the C++ standard) can be initialized that way. That
+ // means we must have no constructors, no base classes, no virtual
+ // functions, and no private or protected members.
#if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
-extern __gthread_mutex_t _GLIBCPP_mutex;
-extern __gthread_mutex_t *_GLIBCPP_mutex_address;
-extern __gthread_once_t _GLIBCPP_once;
-extern void _GLIBCPP_mutex_init (void);
-extern void _GLIBCPP_mutex_address_init (void);
+ extern __gthread_mutex_t _GLIBCPP_mutex;
+ extern __gthread_mutex_t *_GLIBCPP_mutex_address;
+ extern __gthread_once_t _GLIBCPP_once;
+ extern void _GLIBCPP_mutex_init (void);
+ extern void _GLIBCPP_mutex_address_init (void);
#endif
-struct _STL_mutex_lock
-{
- // The class must be statically initialized with __STL_MUTEX_INITIALIZER.
+ struct _STL_mutex_lock
+ {
+ // The class must be statically initialized with __STL_MUTEX_INITIALIZER.
#if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
- volatile int _M_init_flag;
- __gthread_once_t _M_once;
+ volatile int _M_init_flag;
+ __gthread_once_t _M_once;
#endif
- __gthread_mutex_t _M_lock;
- void _M_initialize() {
+ __gthread_mutex_t _M_lock;
+
+ void
+ _M_initialize()
+ {
#ifdef __GTHREAD_MUTEX_INIT
- // There should be no code in this path given the usage rules above.
+ // There should be no code in this path given the usage rules above.
#elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
- if (_M_init_flag) return;
- if (__gthread_once (&_GLIBCPP_once, _GLIBCPP_mutex_init) != 0
- && __gthread_active_p ())
- abort ();
- __gthread_mutex_lock (&_GLIBCPP_mutex);
- if (!_M_init_flag) {
- // Even though we have a global lock, we use __gthread_once to be
- // absolutely certain the _M_lock mutex is only initialized once on
- // multiprocessor systems.
- _GLIBCPP_mutex_address = &_M_lock;
- if (__gthread_once (&_M_once, _GLIBCPP_mutex_address_init) != 0
+ if (_M_init_flag) return;
+ if (__gthread_once (&_GLIBCPP_once, _GLIBCPP_mutex_init) != 0
+ && __gthread_active_p ())
+ abort ();
+ __gthread_mutex_lock (&_GLIBCPP_mutex);
+ if (!_M_init_flag)
+ {
+ // Even though we have a global lock, we use __gthread_once to be
+ // absolutely certain the _M_lock mutex is only initialized once on
+ // multiprocessor systems.
+ _GLIBCPP_mutex_address = &_M_lock;
+ if (__gthread_once (&_M_once, _GLIBCPP_mutex_address_init) != 0
&& __gthread_active_p ())
- abort ();
- _M_init_flag = 1;
- }
- __gthread_mutex_unlock (&_GLIBCPP_mutex);
+ abort ();
+ _M_init_flag = 1;
+ }
+ __gthread_mutex_unlock (&_GLIBCPP_mutex);
#endif
- }
- void _M_acquire_lock() {
+ }
+
+ void
+ _M_acquire_lock()
+ {
#if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
- if (!_M_init_flag) _M_initialize();
+ if (!_M_init_flag) _M_initialize();
#endif
- __gthread_mutex_lock(&_M_lock);
- }
- void _M_release_lock() {
+ __gthread_mutex_lock(&_M_lock);
+ }
+
+ void
+ _M_release_lock()
+ {
#if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
- if (!_M_init_flag) _M_initialize();
+ if (!_M_init_flag) _M_initialize();
#endif
- __gthread_mutex_unlock(&_M_lock);
- }
-};
-
+ __gthread_mutex_unlock(&_M_lock);
+ }
+ };
+
#ifdef __GTHREAD_MUTEX_INIT
#define __STL_MUTEX_INITIALIZER = { __GTHREAD_MUTEX_INIT }
#elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
#endif
#endif
-// A locking class that uses _STL_mutex_lock. The constructor takes a
-// reference to an _STL_mutex_lock, and acquires a lock. The
-// destructor releases the lock. It's not clear that this is exactly
-// the right functionality. It will probably change in the future.
-
-struct _STL_auto_lock
-{
- _STL_mutex_lock& _M_lock;
-
- _STL_auto_lock(_STL_mutex_lock& __lock) : _M_lock(__lock)
+ // A locking class that uses _STL_mutex_lock. The constructor takes a
+ // reference to an _STL_mutex_lock, and acquires a lock. The
+ // destructor releases the lock. It's not clear that this is exactly
+ // the right functionality. It will probably change in the future.
+ struct _STL_auto_lock
+ {
+ _STL_mutex_lock& _M_lock;
+
+ _STL_auto_lock(_STL_mutex_lock& __lock) : _M_lock(__lock)
{ _M_lock._M_acquire_lock(); }
- ~_STL_auto_lock() { _M_lock._M_release_lock(); }
-private:
- void operator=(const _STL_auto_lock&);
- _STL_auto_lock(const _STL_auto_lock&);
-};
+ ~_STL_auto_lock() { _M_lock._M_release_lock(); }
+ private:
+ void operator=(const _STL_auto_lock&);
+ _STL_auto_lock(const _STL_auto_lock&);
+ };
+
} // namespace std
-#endif /* __SGI_STL_INTERNAL_THREADS_H */
-
-// Local Variables:
-// mode:C++
-// End:
+#endif
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