#include <bits/std_cstdlib.h>
#include <bits/std_cstring.h>
#include <bits/std_cassert.h>
-
-// To see the effects of this block of macro wrangling, jump to
-// "Default node allocator" below.
-#ifdef __STL_THREADS
-# include <bits/stl_threads.h>
-# define __NODE_ALLOCATOR_THREADS true
-# ifdef __STL_SGI_THREADS
- // We test whether threads are in use before locking.
- // Perhaps this should be moved into stl_threads.h, but that
- // probably makes it harder to avoid the procedure call when
- // it isn't needed.
- extern "C" {
- extern int __us_rsthread_malloc;
- }
- // The above is copied from malloc.h. Including <malloc.h>
- // would be cleaner but fails with certain levels of standard
- // conformance.
-# define __NODE_ALLOCATOR_LOCK if (__threads && __us_rsthread_malloc) \
- { _S_node_allocator_lock._M_acquire_lock(); }
-# define __NODE_ALLOCATOR_UNLOCK if (__threads && __us_rsthread_malloc) \
- { _S_node_allocator_lock._M_release_lock(); }
-# else /* !__STL_SGI_THREADS */
-# define __NODE_ALLOCATOR_LOCK \
- { if (__threads) _S_node_allocator_lock._M_acquire_lock(); }
-# define __NODE_ALLOCATOR_UNLOCK \
- { if (__threads) _S_node_allocator_lock._M_release_lock(); }
-# endif
-#else
-// Thread-unsafe
-# define __NODE_ALLOCATOR_LOCK
-# define __NODE_ALLOCATOR_UNLOCK
-# define __NODE_ALLOCATOR_THREADS false
-#endif
+#include <bits/stl_threads.h>
namespace std
{
static char* _S_end_free;
static size_t _S_heap_size;
-#ifdef __STL_THREADS
- static _STL_mutex_lock _S_node_allocator_lock;
-#endif
+ static _STL_mutex_lock _S_node_allocator_lock;
// It would be nice to use _STL_auto_lock here. But we
// don't need the NULL check. And we do need a test whether
friend class _Lock;
class _Lock {
public:
- _Lock() { __NODE_ALLOCATOR_LOCK; }
- ~_Lock() { __NODE_ALLOCATOR_UNLOCK; }
+ _Lock() { if (__threads) _S_node_allocator_lock._M_acquire_lock(); }
+ ~_Lock() { if (__threads) _S_node_allocator_lock._M_release_lock(); }
};
public:
// Acquire the lock here with a constructor call.
// This ensures that it is released in exit or during stack
// unwinding.
-# ifndef _NOTHREADS
- /*REFERENCED*/
_Lock __lock_instance;
-# endif
_Obj* __restrict__ __result = *__my_free_list;
if (__result == 0)
__ret = _S_refill(_S_round_up(__n));
_Obj* __q = (_Obj*)__p;
// acquire lock
-# ifndef _NOTHREADS
- /*REFERENCED*/
_Lock __lock_instance;
-# endif /* _NOTHREADS */
__q -> _M_free_list_link = *__my_free_list;
*__my_free_list = __q;
// lock is released here
return(__result);
}
-#ifdef __STL_THREADS
- template <bool __threads, int __inst>
- _STL_mutex_lock
- __default_alloc_template<__threads, __inst>::_S_node_allocator_lock
- __STL_MUTEX_INITIALIZER;
-#endif
-
+template <bool __threads, int __inst>
+_STL_mutex_lock
+__default_alloc_template<__threads, __inst>::_S_node_allocator_lock
+ __STL_MUTEX_INITIALIZER;
template <bool __threads, int __inst>
char* __default_alloc_template<__threads, __inst>::_S_start_free = 0;
] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
-// __NODE_ALLOCATOR_THREADS is predicated on __STL_THREADS being defined or not
-typedef __default_alloc_template<__NODE_ALLOCATOR_THREADS, 0> alloc;
+typedef __default_alloc_template<true, 0> alloc;
typedef __default_alloc_template<false, 0> single_client_alloc;
#ifndef __SGI_STL_INTERNAL_THREADS_H
#define __SGI_STL_INTERNAL_THREADS_H
-// Supported threading models are native SGI, pthreads, uithreads
-// (similar to pthreads, but based on an earlier draft of the Posix
-// threads standard), and Win32 threads. Uithread support by Jochen
-// Schlick, 1999.
-
-// GCC extension begin
-// In order to present a stable threading configuration, in all cases,
-// gcc looks for it's own abstraction layer before all others. All
-// modifications to this file are marked to allow easier importation of
-// STL upgrades.
-#if defined(__STL_GTHREADS)
+// The only supported threading model is GCC's own gthr.h abstraction layer.
#include "bits/gthr.h"
-#else
-// GCC extension end
-#if defined(__STL_SGI_THREADS)
-#include <mutex.h>
-#include <time.h>
-#elif defined(__STL_PTHREADS)
-#include <pthread.h>
-#elif defined(__STL_UITHREADS)
-#include <thread.h>
-#include <synch.h>
-#elif defined(__STL_WIN32THREADS)
-#include <windows.h>
-#endif
-// GCC extension begin
-#endif
-// GCC extension end
namespace std
{
// _M_ref_count, and member functions _M_incr and _M_decr, which perform
// atomic preincrement/predecrement. The constructor initializes
// _M_ref_count.
-
-// Hack for SGI o32 compilers.
-#if defined(__STL_SGI_THREADS) && !defined(__add_and_fetch) && \
- (__mips < 3 || !(defined (_ABIN32) || defined(_ABI64)))
-# define __add_and_fetch(__l,__v) add_then_test((unsigned long*)__l,__v)
-# define __test_and_set(__l,__v) test_and_set(__l,__v)
-#endif /* o32 */
-
struct _Refcount_Base
{
// The type _RC_t
-# ifdef __STL_WIN32THREADS
- typedef long _RC_t;
-# else
typedef size_t _RC_t;
-#endif
// The data member _M_ref_count
volatile _RC_t _M_ref_count;
// Constructor
-// GCC extension begin
-#ifdef __STL_GTHREADS
__gthread_mutex_t _M_ref_count_lock;
_Refcount_Base(_RC_t __n) : _M_ref_count(__n)
{
#error __GTHREAD_MUTEX_INIT or __GTHREAD_MUTEX_INIT_FUNCTION should be defined by gthr.h abstraction layer, report problem to libstdc++@gcc.gnu.org.
#endif
}
-#else
-// GCC extension end
-# ifdef __STL_PTHREADS
- pthread_mutex_t _M_ref_count_lock;
- _Refcount_Base(_RC_t __n) : _M_ref_count(__n)
- { pthread_mutex_init(&_M_ref_count_lock, 0); }
-# elif defined(__STL_UITHREADS)
- mutex_t _M_ref_count_lock;
- _Refcount_Base(_RC_t __n) : _M_ref_count(__n)
- { mutex_init(&_M_ref_count_lock, USYNC_THREAD, 0); }
-# else
- _Refcount_Base(_RC_t __n) : _M_ref_count(__n) {}
-# endif
-// GCC extension begin
-#endif
-// GCC extension end
-// GCC extension begin
-#ifdef __STL_GTHREADS
void _M_incr() {
__gthread_mutex_lock(&_M_ref_count_lock);
++_M_ref_count;
__gthread_mutex_unlock(&_M_ref_count_lock);
return __tmp;
}
-#else
-// GCC extension end
- // _M_incr and _M_decr
-# ifdef __STL_SGI_THREADS
- void _M_incr() { __add_and_fetch(&_M_ref_count, 1); }
- _RC_t _M_decr() { return __add_and_fetch(&_M_ref_count, (size_t) -1); }
-# elif defined (__STL_WIN32THREADS)
- void _M_incr() { InterlockedIncrement((_RC_t*)&_M_ref_count); }
- _RC_t _M_decr() { return InterlockedDecrement((_RC_t*)&_M_ref_count); }
-# elif defined(__STL_PTHREADS)
- void _M_incr() {
- pthread_mutex_lock(&_M_ref_count_lock);
- ++_M_ref_count;
- pthread_mutex_unlock(&_M_ref_count_lock);
- }
- _RC_t _M_decr() {
- pthread_mutex_lock(&_M_ref_count_lock);
- volatile _RC_t __tmp = --_M_ref_count;
- pthread_mutex_unlock(&_M_ref_count_lock);
- return __tmp;
- }
-# elif defined(__STL_UITHREADS)
- void _M_incr() {
- mutex_lock(&_M_ref_count_lock);
- ++_M_ref_count;
- mutex_unlock(&_M_ref_count_lock);
- }
- _RC_t _M_decr() {
- mutex_lock(&_M_ref_count_lock);
- /*volatile*/ _RC_t __tmp = --_M_ref_count;
- mutex_unlock(&_M_ref_count_lock);
- return __tmp;
- }
-# else /* No threads */
- void _M_incr() { ++_M_ref_count; }
- _RC_t _M_decr() { return --_M_ref_count; }
-# endif
-// GCC extension begin
-#endif
-// GCC extension end
};
// 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.
-// GCC extension begin
-#if defined (__STL_GTHREADS) && defined (__GTHREAD_MUTEX_INIT)
-// We don't provide an _Atomic_swap in this configuration. This only
-// affects the use of ext/rope with threads. Someone could add this
-// later, if required. You can start by cloning the __STL_PTHREADS
-// path while making the obvious changes. Later it could be optimized
-// to use the atomicity.h abstraction layer from libstdc++-v3.
+#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>
__gthread_mutex_unlock(&_Swap_lock_struct<0>::_S_swap_lock);
return __result;
}
-
-#else
-// GCC extension end
-# ifdef __STL_SGI_THREADS
- inline unsigned long _Atomic_swap(unsigned long * __p, unsigned long __q) {
-# if __mips < 3 || !(defined (_ABIN32) || defined(_ABI64))
- return test_and_set(__p, __q);
-# else
- return __test_and_set(__p, (unsigned long)__q);
-# endif
- }
-# elif defined(__STL_WIN32THREADS)
- inline unsigned long _Atomic_swap(unsigned long * __p, unsigned long __q) {
- return (unsigned long) InterlockedExchange((LPLONG)__p, (LONG)__q);
- }
-# elif defined(__STL_PTHREADS)
- // We use a template here only to get a unique initialized instance.
- template<int __dummy>
- struct _Swap_lock_struct {
- static pthread_mutex_t _S_swap_lock;
- };
-
- template<int __dummy>
- pthread_mutex_t
- _Swap_lock_struct<__dummy>::_S_swap_lock = PTHREAD_MUTEX_INITIALIZER;
-
- // 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) {
- pthread_mutex_lock(&_Swap_lock_struct<0>::_S_swap_lock);
- unsigned long __result = *__p;
- *__p = __q;
- pthread_mutex_unlock(&_Swap_lock_struct<0>::_S_swap_lock);
- return __result;
- }
-# elif defined(__STL_UITHREADS)
- // We use a template here only to get a unique initialized instance.
- template<int __dummy>
- struct _Swap_lock_struct {
- static mutex_t _S_swap_lock;
- };
-
- template<int __dummy>
- mutex_t
- _Swap_lock_struct<__dummy>::_S_swap_lock = DEFAULTMUTEX;
-
- // 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) {
- mutex_lock(&_Swap_lock_struct<0>::_S_swap_lock);
- unsigned long __result = *__p;
- *__p = __q;
- mutex_unlock(&_Swap_lock_struct<0>::_S_swap_lock);
- return __result;
- }
-# elif defined (__STL_SOLARIS_THREADS)
- // any better solutions ?
- // We use a template here only to get a unique initialized instance.
- template<int __dummy>
- struct _Swap_lock_struct {
- static mutex_t _S_swap_lock;
- };
-
-# if ( __STL_STATIC_TEMPLATE_DATA > 0 )
- template<int __dummy>
- mutex_t
- _Swap_lock_struct<__dummy>::_S_swap_lock = DEFAULTMUTEX;
-# else
- __DECLARE_INSTANCE(mutex_t, _Swap_lock_struct<__dummy>::_S_swap_lock,
- =DEFAULTMUTEX);
-# endif /* ( __STL_STATIC_TEMPLATE_DATA > 0 ) */
-
- // 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) {
- mutex_lock(&_Swap_lock_struct<0>::_S_swap_lock);
- unsigned long __result = *__p;
- *__p = __q;
- mutex_unlock(&_Swap_lock_struct<0>::_S_swap_lock);
- return __result;
- }
-# else
- static inline unsigned long _Atomic_swap(unsigned long * __p, unsigned long __q) {
- unsigned long __result = *__p;
- *__p = __q;
- return __result;
- }
-# endif
-// GCC extension begin
#endif
-// GCC extension end
// Locking class. Note that this class *does not have a constructor*.
// It must be initialized either statically, with __STL_MUTEX_INITIALIZER,
// constructors, no base classes, no virtual functions, and no private or
// protected members.
-// Helper struct. This is a workaround for various compilers that don't
-// handle static variables in inline functions properly.
-template <int __inst>
-struct _STL_mutex_spin {
- enum { __low_max = 30, __high_max = 1000 };
- // Low if we suspect uniprocessor, high for multiprocessor.
-
- static unsigned __max;
- static unsigned __last;
-};
-
-template <int __inst>
-unsigned _STL_mutex_spin<__inst>::__max = _STL_mutex_spin<__inst>::__low_max;
-
-template <int __inst>
-unsigned _STL_mutex_spin<__inst>::__last = 0;
-
-// GCC extension begin
-#if defined(__STL_GTHREADS)
#if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
extern __gthread_mutex_t _GLIBCPP_mutex;
extern __gthread_mutex_t *_GLIBCPP_mutex_address;
extern void _GLIBCPP_mutex_init (void);
extern void _GLIBCPP_mutex_address_init (void);
#endif
-#endif
-// GCC extension end
struct _STL_mutex_lock
{
-// GCC extension begin
-#if defined(__STL_GTHREADS)
// 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;
#endif
__gthread_mutex_unlock(&_M_lock);
}
-#else
-// GCC extension end
-#if defined(__STL_SGI_THREADS) || defined(__STL_WIN32THREADS)
- // It should be relatively easy to get this to work on any modern Unix.
- volatile unsigned long _M_lock;
- void _M_initialize() { _M_lock = 0; }
- static void _S_nsec_sleep(int __log_nsec) {
-# ifdef __STL_SGI_THREADS
- struct timespec __ts;
- /* Max sleep is 2**27nsec ~ 60msec */
- __ts.tv_sec = 0;
- __ts.tv_nsec = 1L << __log_nsec;
- nanosleep(&__ts, 0);
-# elif defined(__STL_WIN32THREADS)
- if (__log_nsec <= 20) {
- Sleep(0);
- } else {
- Sleep(1 << (__log_nsec - 20));
- }
-# else
-# error unimplemented
-# endif
- }
- void _M_acquire_lock() {
- volatile unsigned long* __lock = &this->_M_lock;
-
- if (!_Atomic_swap((unsigned long*)__lock, 1)) {
- return;
- }
- unsigned __my_spin_max = _STL_mutex_spin<0>::__max;
- unsigned __my_last_spins = _STL_mutex_spin<0>::__last;
- volatile unsigned __junk = 17; // Value doesn't matter.
- unsigned __i;
- for (__i = 0; __i < __my_spin_max; __i++) {
- if (__i < __my_last_spins/2 || *__lock) {
- __junk *= __junk; __junk *= __junk;
- __junk *= __junk; __junk *= __junk;
- continue;
- }
- if (!_Atomic_swap((unsigned long*)__lock, 1)) {
- // got it!
- // Spinning worked. Thus we're probably not being scheduled
- // against the other process with which we were contending.
- // Thus it makes sense to spin longer the next time.
- _STL_mutex_spin<0>::__last = __i;
- _STL_mutex_spin<0>::__max = _STL_mutex_spin<0>::__high_max;
- return;
- }
- }
- // We are probably being scheduled against the other process. Sleep.
- _STL_mutex_spin<0>::__max = _STL_mutex_spin<0>::__low_max;
- for (__i = 0 ;; ++__i) {
- int __log_nsec = __i + 6;
-
- if (__log_nsec > 27) __log_nsec = 27;
- if (!_Atomic_swap((unsigned long *)__lock, 1)) {
- return;
- }
- _S_nsec_sleep(__log_nsec);
- }
- }
- void _M_release_lock() {
- volatile unsigned long* __lock = &_M_lock;
-# if defined(__STL_SGI_THREADS) && defined(__GNUC__) && __mips >= 3
- asm("sync");
- *__lock = 0;
-# elif defined(__STL_SGI_THREADS) && __mips >= 3 \
- && (defined (_ABIN32) || defined(_ABI64))
- __lock_release(__lock);
-# else
- *__lock = 0;
- // This is not sufficient on many multiprocessors, since
- // writes to protected variables and the lock may be reordered.
-# endif
- }
-
-// We no longer use win32 critical sections.
-// They appear to be slower in the contention-free case,
-// and they appear difficult to initialize without introducing a race.
-
-#elif defined(__STL_PTHREADS)
- pthread_mutex_t _M_lock;
- void _M_initialize() { pthread_mutex_init(&_M_lock, NULL); }
- void _M_acquire_lock() { pthread_mutex_lock(&_M_lock); }
- void _M_release_lock() { pthread_mutex_unlock(&_M_lock); }
-#elif defined(__STL_UITHREADS)
- mutex_t _M_lock;
- void _M_initialize() { mutex_init(&_M_lock, USYNC_THREAD, 0); }
- void _M_acquire_lock() { mutex_lock(&_M_lock); }
- void _M_release_lock() { mutex_unlock(&_M_lock); }
-#else /* No threads */
- void _M_initialize() {}
- void _M_acquire_lock() {}
- void _M_release_lock() {}
-#endif
-// GCC extension begin
-#endif
-// GCC extension end
};
-// GCC extension begin
-#if defined(__STL_GTHREADS)
#ifdef __GTHREAD_MUTEX_INIT
#define __STL_MUTEX_INITIALIZER = { __GTHREAD_MUTEX_INIT }
#elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
#define __STL_MUTEX_INITIALIZER = { 0, __GTHREAD_ONCE_INIT }
#endif
#endif
-#else
-// GCC extension end
-#ifdef __STL_PTHREADS
-// Pthreads locks must be statically initialized to something other than
-// the default value of zero.
-# define __STL_MUTEX_INITIALIZER = { PTHREAD_MUTEX_INITIALIZER }
-#elif defined(__STL_UITHREADS)
-// UIthreads locks must be statically initialized to something other than
-// the default value of zero.
-# define __STL_MUTEX_INITIALIZER = { DEFAULTMUTEX }
-#elif defined(__STL_SGI_THREADS) || defined(__STL_WIN32THREADS)
-# define __STL_MUTEX_INITIALIZER = { 0 }
-#else
-# define __STL_MUTEX_INITIALIZER
-#endif
-// GCC extension begin
-#endif
-// GCC extension end
-
// A locking class that uses _STL_mutex_lock. The constructor takes a
// reference to an _STL_mutex_lock, and acquires a lock. The
// Local Variables:
// mode:C++
// End:
-
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