/*
* Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
*
* Copyright (c) 1997-1999
* Silicon Graphics Computer Systems, Inc.
*
* Copyright (c) 1999
* Boris Fomitchev
*
* This material is provided "as is", with absolutely no warranty expressed
* or implied. Any use is at your own risk.
*
* Permission to use or copy this software for any purpose is hereby granted
* without fee, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*
*/
// WARNING: This is an internal header file, included by other C++
// standard library headers. You should not attempt to use this header
// file directly.
#ifndef _STLP_INTERNAL_THREADS_H
#define _STLP_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, and Solaris threads generalized to them.
#ifndef _STLP_INTERNAL_CSTDDEF
# include <stl/_cstddef.h>
#endif
#ifndef _STLP_INTERNAL_CSTDLIB
# include <stl/_cstdlib.h>
#endif
// On SUN and Mac OS X gcc, zero-initialization works just fine...
#if defined (__sun) || (defined (__GNUC__) && defined(__APPLE__))
# define _STLP_MUTEX_INITIALIZER
#endif
/* This header defines the following atomic operation that platform should
* try to support as much as possible. Atomic operation are exposed as macro
* in order to easily test for their existance. They are:
* __stl_atomic_t _STLP_ATOMIC_INCREMENT(volatile __stl_atomic_t* __ptr) :
* increment *__ptr by 1 and returns the new value
* __stl_atomic_t _STLP_ATOMIC_DECREMENT(volatile __stl_atomic_t* __ptr) :
* decrement *__ptr by 1 and returns the new value
* __stl_atomic_t _STLP_ATOMIC_EXCHANGE(volatile __stl_atomic_t* __target, __stl_atomic_t __val) :
* assign __val to *__target and returns former *__target value
* void* _STLP_ATOMIC_EXCHANGE_PTR(void* volatile* __target, void* __ptr) :
* assign __ptr to *__target and returns former *__target value
* __stl_atomic_t _STLP_ATOMIC_ADD(volatile __stl_atomic_t* __target, __stl_atomic_t __val) :
* does *__target = *__target + __val and returns the old *__target value
*/
#if defined (_STLP_WIN32) || defined (__sgi) || defined (_STLP_SPARC_SOLARIS_THREADS)
typedef long __stl_atomic_t;
#else
/* Don't import whole namespace!!!! - ptr */
// # if defined (_STLP_USE_NAMESPACES) && ! defined (_STLP_VENDOR_GLOBAL_CSTD)
// // using _STLP_VENDOR_CSTD::size_t;
// using namespace _STLP_VENDOR_CSTD;
// # endif
typedef size_t __stl_atomic_t;
#endif
#if defined (_STLP_THREADS)
# if defined (_STLP_SGI_THREADS)
# include <mutex.h>
// Hack for SGI o32 compilers.
# if !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 */
# if __mips < 3 || !(defined (_ABIN32) || defined(_ABI64))
# define _STLP_ATOMIC_EXCHANGE(__p, __q) test_and_set(__p, __q)
# else
# define _STLP_ATOMIC_EXCHANGE(__p, __q) __test_and_set((unsigned long*)__p, (unsigned long)__q)
# endif
# define _STLP_ATOMIC_INCREMENT(__x) __add_and_fetch(__x, 1)
# define _STLP_ATOMIC_DECREMENT(__x) __add_and_fetch(__x, (size_t) -1)
# elif defined (_STLP_PTHREADS)
# include <pthread.h>
# if !defined (_STLP_USE_PTHREAD_SPINLOCK)
# if defined (PTHREAD_MUTEX_INITIALIZER) && !defined (_STLP_MUTEX_INITIALIZER) && defined (_REENTRANT)
# define _STLP_MUTEX_INITIALIZER = { PTHREAD_MUTEX_INITIALIZER }
# endif
//HPUX variants have (on some platforms optional) non-standard "DCE" pthreads impl
# if defined (_DECTHREADS_) && (defined (_PTHREAD_USE_D4) || defined (__hpux)) && !defined (_CMA_SUPPRESS_EXTERNALS_)
# define _STLP_PTHREAD_ATTR_DEFAULT pthread_mutexattr_default
# else
# define _STLP_PTHREAD_ATTR_DEFAULT 0
# endif
# else // _STLP_USE_PTHREAD_SPINLOCK
# if defined (__OpenBSD__)
# include <spinlock.h>
# endif
# endif // _STLP_USE_PTHREAD_SPINLOCK
# if defined (__GNUC__) && defined (__i386__)
# if !defined (_STLP_ATOMIC_INCREMENT)
inline long _STLP_atomic_increment_gcc_x86(long volatile* p) {
long result;
__asm__ __volatile__
("lock; xaddl %1, %0;"
:"=m" (*p), "=r" (result)
:"m" (*p), "1" (1)
:"cc");
return result + 1;
}
# define _STLP_ATOMIC_INCREMENT(__x) (_STLP_atomic_increment_gcc_x86((long volatile*)__x))
# endif
# if !defined (_STLP_ATOMIC_DECREMENT)
inline long _STLP_atomic_decrement_gcc_x86(long volatile* p) {
long result;
__asm__ __volatile__
("lock; xaddl %1, %0;"
:"=m" (*p), "=r" (result)
:"m" (*p), "1" (-1)
:"cc");
return result - 1;
}
# define _STLP_ATOMIC_DECREMENT(__x) (_STLP_atomic_decrement_gcc_x86((long volatile*)__x))
# endif
# if !defined (_STLP_ATOMIC_ADD)
inline long _STLP_atomic_add_gcc_x86(long volatile* p, long addend) {
long result;
__asm__ __volatile__
("lock; xaddl %1, %0;"
:"=m" (*p), "=r" (result)
:"m" (*p), "1" (addend)
:"cc");
return result + addend;
}
# define _STLP_ATOMIC_ADD(__dst, __val) (_STLP_atomic_add_gcc_x86((long volatile*)__dst, (long)__val))
# endif
# endif /* if defined(__GNUC__) && defined(__i386__) */
# elif defined (_STLP_WIN32THREADS)
# if !defined (_STLP_ATOMIC_INCREMENT)
# if !defined (_STLP_NEW_PLATFORM_SDK)
# define _STLP_ATOMIC_INCREMENT(__x) InterlockedIncrement(__CONST_CAST(long*, __x))
# define _STLP_ATOMIC_DECREMENT(__x) InterlockedDecrement(__CONST_CAST(long*, __x))
# define _STLP_ATOMIC_EXCHANGE(__x, __y) InterlockedExchange(__CONST_CAST(long*, __x), __y)
# else
# define _STLP_ATOMIC_INCREMENT(__x) InterlockedIncrement(__x)
# define _STLP_ATOMIC_DECREMENT(__x) InterlockedDecrement(__x)
# define _STLP_ATOMIC_EXCHANGE(__x, __y) InterlockedExchange(__x, __y)
# endif
# define _STLP_ATOMIC_EXCHANGE_PTR(__x, __y) STLPInterlockedExchangePointer(__x, __y)
/*
* The following functionnality is only available since Windows 98, those that are targeting previous OSes
* should define _WIN32_WINDOWS to a value lower that the one of Win 98, see Platform SDK documentation for
* more informations:
*/
# if defined (_STLP_NEW_PLATFORM_SDK) && (!defined (_STLP_WIN32_VERSION) || (_STLP_WIN32_VERSION >= 0x0410))
# define _STLP_ATOMIC_ADD(__dst, __val) InterlockedExchangeAdd(__dst, __val)
# endif
# endif
# elif defined (__DECC) || defined (__DECCXX)
# include <machine/builtins.h>
# define _STLP_ATOMIC_EXCHANGE __ATOMIC_EXCH_LONG
# define _STLP_ATOMIC_INCREMENT(__x) __ATOMIC_ADD_LONG(__x, 1)
# define _STLP_ATOMIC_DECREMENT(__x) __ATOMIC_ADD_LONG(__x, -1)
# elif defined(_STLP_SPARC_SOLARIS_THREADS)
# include <stl/_sparc_atomic.h>
# elif defined (_STLP_UITHREADS)
// this inclusion is potential hazard to bring up all sorts
// of old-style headers. Let's assume vendor already know how
// to deal with that.
# ifndef _STLP_INTERNAL_CTIME
# include <stl/_ctime.h>
# endif
# if defined (_STLP_USE_NAMESPACES) && ! defined (_STLP_VENDOR_GLOBAL_CSTD)
using _STLP_VENDOR_CSTD::time_t;
# endif
# include <synch.h>
# include <cstdio>
# include <cwchar>
# elif defined (_STLP_BETHREADS)
# include <OS.h>
# include <cassert>
# include <stdio.h>
# define _STLP_MUTEX_INITIALIZER = { 0 }
# elif defined (_STLP_NWTHREADS)
# include <nwthread.h>
# include <nwsemaph.h>
# elif defined(_STLP_OS2THREADS)
# if defined (__GNUC__)
# define INCL_DOSSEMAPHORES
# include <os2.h>
# else
// This section serves to replace os2.h for VisualAge C++
typedef unsigned long ULONG;
# if !defined (__HEV__) /* INCL_SEMAPHORE may also define HEV */
# define __HEV__
typedef ULONG HEV;
typedef HEV* PHEV;
# endif
typedef ULONG APIRET;
typedef ULONG HMTX;
typedef HMTX* PHMTX;
typedef const char* PCSZ;
typedef ULONG BOOL32;
APIRET _System DosCreateMutexSem(PCSZ pszName, PHEV phev, ULONG flAttr, BOOL32 fState);
APIRET _System DosRequestMutexSem(HMTX hmtx, ULONG ulTimeout);
APIRET _System DosReleaseMutexSem(HMTX hmtx);
APIRET _System DosCloseMutexSem(HMTX hmtx);
# define _STLP_MUTEX_INITIALIZER = { 0 }
# endif /* GNUC */
# endif
#else
/* no threads */
# define _STLP_ATOMIC_INCREMENT(__x) ++(*__x)
# define _STLP_ATOMIC_DECREMENT(__x) --(*__x)
/* We do not grant other atomic operations as they are useless if STLport do not have
* to be thread safe
*/
#endif
#if !defined (_STLP_MUTEX_INITIALIZER)
# if defined(_STLP_ATOMIC_EXCHANGE)
# define _STLP_MUTEX_INITIALIZER = { 0 }
# elif defined(_STLP_UITHREADS)
# define _STLP_MUTEX_INITIALIZER = { DEFAULTMUTEX }
# else
# define _STLP_MUTEX_INITIALIZER
# endif
#endif
_STLP_BEGIN_NAMESPACE
#if defined (_STLP_THREADS) && !defined (_STLP_USE_PTHREAD_SPINLOCK)
// Helper struct. This is a workaround for various compilers that don't
// handle static variables in inline functions properly.
template <int __inst>
struct _STLP_mutex_spin {
enum { __low_max = 30, __high_max = 1000 };
// Low if we suspect uniprocessor, high for multiprocessor.
//Note: For SYMBIAN Emulator, these entries are to be considered WSD.
//Still, EWSD solution can't be applied since it's templated.
static unsigned __max;
static unsigned __last;
static void _STLP_CALL _M_do_lock(volatile __stl_atomic_t* __lock);
static void _STLP_CALL _S_nsec_sleep(int __log_nsec);
};
#endif // !_STLP_USE_PTHREAD_SPINLOCK
// Locking class. Note that this class *does not have a constructor*.
// It must be initialized either statically, with _STLP_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.
// For non-static cases, clients should use _STLP_mutex.
struct _STLP_CLASS_DECLSPEC _STLP_mutex_base {
#if defined (_STLP_ATOMIC_EXCHANGE) || defined (_STLP_SGI_THREADS)
// It should be relatively easy to get this to work on any modern Unix.
volatile __stl_atomic_t _M_lock;
#endif
#if defined (_STLP_THREADS)
# if defined (_STLP_ATOMIC_EXCHANGE)
inline void _M_initialize() { _M_lock = 0; }
inline void _M_destroy() {}
void _M_acquire_lock() {
_STLP_mutex_spin<0>::_M_do_lock(&_M_lock);
}
inline void _M_release_lock() {
volatile __stl_atomic_t* __lock = &_M_lock;
# if defined(_STLP_SGI_THREADS) && defined(__GNUC__) && __mips >= 3
asm("sync");
*__lock = 0;
# elif defined(_STLP_SGI_THREADS) && __mips >= 3 && \
(defined (_ABIN32) || defined(_ABI64))
__lock_release(__lock);
# elif defined (_STLP_SPARC_SOLARIS_THREADS)
# if defined (__WORD64) || defined (__arch64__) || defined (__sparcv9) || defined (__sparcv8plus)
asm("membar #StoreStore ; membar #LoadStore");
# else
asm(" stbar ");
# endif
*__lock = 0;
# else
*__lock = 0;
// This is not sufficient on many multiprocessors, since
// writes to protected variables and the lock may be reordered.
# endif
}
# elif defined (_STLP_PTHREADS)
# if defined (_STLP_USE_PTHREAD_SPINLOCK)
# if !defined (__OpenBSD__)
pthread_spinlock_t _M_lock;
inline void _M_initialize() { pthread_spin_init( &_M_lock, 0 ); }
inline void _M_destroy() { pthread_spin_destroy( &_M_lock ); }
// sorry, but no static initializer for pthread_spinlock_t;
// this will not work for compilers that has problems with call
// constructor of static object...
// _STLP_mutex_base()
// { pthread_spin_init( &_M_lock, 0 ); }
// ~_STLP_mutex_base()
// { pthread_spin_destroy( &_M_lock ); }
inline void _M_acquire_lock() { pthread_spin_lock( &_M_lock ); }
inline void _M_release_lock() { pthread_spin_unlock( &_M_lock ); }
# else // __OpenBSD__
spinlock_t _M_lock;
inline void _M_initialize() { _SPINLOCK_INIT( &_M_lock ); }
inline void _M_destroy() { }
inline void _M_acquire_lock() { _SPINLOCK( &_M_lock ); }
inline void _M_release_lock() { _SPINUNLOCK( &_M_lock ); }
# endif // __OpenBSD__
# else // !_STLP_USE_PTHREAD_SPINLOCK
pthread_mutex_t _M_lock;
inline void _M_initialize()
{ pthread_mutex_init(&_M_lock,_STLP_PTHREAD_ATTR_DEFAULT); }
inline void _M_destroy()
{ pthread_mutex_destroy(&_M_lock); }
inline void _M_acquire_lock() {
# if defined ( __hpux ) && ! defined (PTHREAD_MUTEX_INITIALIZER)
if (!_M_lock.field1) _M_initialize();
# endif
pthread_mutex_lock(&_M_lock);
}
inline void _M_release_lock() { pthread_mutex_unlock(&_M_lock); }
# endif // !_STLP_USE_PTHREAD_SPINLOCK
# elif defined (_STLP_UITHREADS)
mutex_t _M_lock;
inline void _M_initialize()
{ mutex_init(&_M_lock, 0, NULL); }
inline void _M_destroy()
{ mutex_destroy(&_M_lock); }
inline void _M_acquire_lock() { mutex_lock(&_M_lock); }
inline void _M_release_lock() { mutex_unlock(&_M_lock); }
# elif defined (_STLP_OS2THREADS)
HMTX _M_lock;
inline void _M_initialize() { DosCreateMutexSem(NULL, &_M_lock, 0, false); }
inline void _M_destroy() { DosCloseMutexSem(_M_lock); }
inline void _M_acquire_lock() {
if (!_M_lock) _M_initialize();
DosRequestMutexSem(_M_lock, SEM_INDEFINITE_WAIT);
}
inline void _M_release_lock() { DosReleaseMutexSem(_M_lock); }
# elif defined (_STLP_BETHREADS)
sem_id sem;
inline void _M_initialize() {
sem = create_sem(1, "STLPort");
assert(sem > 0);
}
inline void _M_destroy() {
int t = delete_sem(sem);
assert(t == B_NO_ERROR);
}
inline void _M_acquire_lock();
inline void _M_release_lock() {
status_t t = release_sem(sem);
assert(t == B_NO_ERROR);
}
# elif defined (_STLP_NWTHREADS)
LONG _M_lock;
inline void _M_initialize()
{ _M_lock = OpenLocalSemaphore(1); }
inline void _M_destroy()
{ CloseLocalSemaphore(_M_lock); }
inline void _M_acquire_lock()
{ WaitOnLocalSemaphore(_M_lock); }
inline void _M_release_lock() { SignalLocalSemaphore(_M_lock); }
# else //*ty 11/24/2001 - added configuration check
# error "Unknown thread facility configuration"
# endif
#else /* No threads */
inline void _M_initialize() {}
inline void _M_destroy() {}
inline void _M_acquire_lock() {}
inline void _M_release_lock() {}
#endif // _STLP_PTHREADS
};
// Locking class. The constructor initializes the lock, the destructor destroys it.
// Well - behaving class, does not need static initializer
class _STLP_CLASS_DECLSPEC _STLP_mutex : public _STLP_mutex_base {
public:
inline _STLP_mutex () { _M_initialize(); }
inline ~_STLP_mutex () { _M_destroy(); }
private:
_STLP_mutex(const _STLP_mutex&);
void operator=(const _STLP_mutex&);
};
// A locking class that uses _STLP_STATIC_MUTEX. The constructor takes
// a reference to an _STLP_STATIC_MUTEX, 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 _STLP_CLASS_DECLSPEC _STLP_auto_lock {
_STLP_auto_lock(_STLP_STATIC_MUTEX& __lock) : _M_lock(__lock)
{ _M_lock._M_acquire_lock(); }
~_STLP_auto_lock()
{ _M_lock._M_release_lock(); }
private:
_STLP_STATIC_MUTEX& _M_lock;
void operator=(const _STLP_auto_lock&);
_STLP_auto_lock(const _STLP_auto_lock&);
};
/*
* Class _Refcount_Base provides a type, __stl_atomic_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.
*/
class _STLP_CLASS_DECLSPEC _Refcount_Base {
// The data member _M_ref_count
#if defined (__DMC__)
public:
#endif
_STLP_VOLATILE __stl_atomic_t _M_ref_count;
#if defined (_STLP_THREADS) && \
(!defined (_STLP_ATOMIC_INCREMENT) || !defined (_STLP_ATOMIC_DECREMENT) || \
(defined (_STLP_WIN32_VERSION) && (_STLP_WIN32_VERSION <= 0x0400)))
# define _STLP_USE_MUTEX
_STLP_mutex _M_mutex;
#endif
public:
// Constructor
_Refcount_Base(__stl_atomic_t __n) : _M_ref_count(__n) {}
// _M_incr and _M_decr
#if defined (_STLP_THREADS)
# if !defined (_STLP_USE_MUTEX)
__stl_atomic_t _M_incr() { return _STLP_ATOMIC_INCREMENT(&_M_ref_count); }
__stl_atomic_t _M_decr() { return _STLP_ATOMIC_DECREMENT(&_M_ref_count); }
# else
# undef _STLP_USE_MUTEX
__stl_atomic_t _M_incr() {
_STLP_auto_lock l(_M_mutex);
return ++_M_ref_count;
}
__stl_atomic_t _M_decr() {
_STLP_auto_lock l(_M_mutex);
return --_M_ref_count;
}
# endif
#else /* No threads */
__stl_atomic_t _M_incr() { return ++_M_ref_count; }
__stl_atomic_t _M_decr() { return --_M_ref_count; }
#endif
};
_STLP_END_NAMESPACE
#ifdef __SYMBIAN32__WSD__
_STLP_DECLSPEC std::_STLP_STATIC_MUTEX& exp_get_threads_S_swap_lock();
_STLP_DECLSPEC std::_STLP_STATIC_MUTEX& exp_get_threads_0_S_swap_lock();
#endif
_STLP_BEGIN_NAMESPACE
/* Atomic swap on __stl_atomic_t
* 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.
* Idem for _Atomic_swap_ptr
*/
/* Helper struct to handle following cases:
* - on platforms where sizeof(__stl_atomic_t) == sizeof(void*) atomic
* exchange can be done on pointers
* - on platform without atomic operation swap is done in a critical section,
* portable but inefficient.
*/
template <int __use_ptr_atomic_swap>
class _Atomic_swap_struct {
public:
#if defined (_STLP_THREADS) && \
!defined (_STLP_ATOMIC_EXCHANGE) && \
(defined (_STLP_PTHREADS) || defined (_STLP_UITHREADS) || defined (_STLP_OS2THREADS) || \
defined (_STLP_USE_PTHREAD_SPINLOCK) || defined (_STLP_NWTHREADS))
# define _STLP_USE_ATOMIC_SWAP_MUTEX
#if !defined(__SYMBIAN32__WSD__)
static _STLP_STATIC_MUTEX _S_swap_lock;
#else
static _STLP_STATIC_MUTEX& get_threads_S_swap_lock()
{ return ::exp_get_threads_S_swap_lock(); }
# define _S_swap_lock get_threads_S_swap_lock()
#endif
#endif
static __stl_atomic_t _S_swap(_STLP_VOLATILE __stl_atomic_t* __p, __stl_atomic_t __q) {
#if defined (_STLP_THREADS)
# if defined (_STLP_ATOMIC_EXCHANGE)
return _STLP_ATOMIC_EXCHANGE(__p, __q);
# elif defined (_STLP_USE_ATOMIC_SWAP_MUTEX)
_S_swap_lock._M_acquire_lock();
__stl_atomic_t __result = *__p;
*__p = __q;
_S_swap_lock._M_release_lock();
return __result;
# else
# error Missing atomic swap implementation
# endif
#else
/* no threads */
__stl_atomic_t __result = *__p;
*__p = __q;
return __result;
#endif // _STLP_THREADS
}
static void* _S_swap_ptr(void* _STLP_VOLATILE* __p, void* __q) {
#if defined (_STLP_THREADS)
# if defined (_STLP_ATOMIC_EXCHANGE_PTR)
return _STLP_ATOMIC_EXCHANGE_PTR(__p, __q);
# elif defined (_STLP_ATOMIC_EXCHANGE)
_STLP_STATIC_ASSERT(sizeof(__stl_atomic_t) == sizeof(void*))
return __REINTERPRET_CAST(void*, _STLP_ATOMIC_EXCHANGE(__REINTERPRET_CAST(volatile __stl_atomic_t*, __p),
__REINTERPRET_CAST(__stl_atomic_t, __q))
);
# elif defined (_STLP_USE_ATOMIC_SWAP_MUTEX)
_S_swap_lock._M_acquire_lock();
void *__result = *__p;
*__p = __q;
_S_swap_lock._M_release_lock();
return __result;
# else
# error Missing pointer atomic swap implementation
# endif
#else
/* no thread */
void *__result = *__p;
*__p = __q;
return __result;
#endif
}
};
#if defined(__SYMBIAN32__WSD__)
# undef _S_swap_lock
#endif
_STLP_TEMPLATE_NULL
class _Atomic_swap_struct<0> {
public:
#if defined (_STLP_THREADS) && \
(!defined (_STLP_ATOMIC_EXCHANGE) || !defined (_STLP_ATOMIC_EXCHANGE_PTR)) && \
(defined (_STLP_PTHREADS) || defined (_STLP_UITHREADS) || defined (_STLP_OS2THREADS) || \
defined (_STLP_USE_PTHREAD_SPINLOCK) || defined (_STLP_NWTHREADS))
# define _STLP_USE_ATOMIC_SWAP_MUTEX
#if !defined(__SYMBIAN32__WSD__)
static _STLP_STATIC_MUTEX _S_swap_lock;
#else
static _STLP_STATIC_MUTEX& get_threads_0_S_swap_lock()
{ return ::exp_get_threads_0_S_swap_lock(); }
# define _S_swap_lock get_threads_0_S_swap_lock()
#endif
#endif
static __stl_atomic_t _S_swap(_STLP_VOLATILE __stl_atomic_t* __p, __stl_atomic_t __q) {
#if defined (_STLP_THREADS)
# if defined (_STLP_ATOMIC_EXCHANGE)
return _STLP_ATOMIC_EXCHANGE(__p, __q);
# elif defined (_STLP_USE_ATOMIC_SWAP_MUTEX)
/* This should be portable, but performance is expected
* to be quite awful. This really needs platform specific
* code.
*/
_S_swap_lock._M_acquire_lock();
__stl_atomic_t __result = *__p;
*__p = __q;
_S_swap_lock._M_release_lock();
return __result;
# else
# error Missing atomic swap implementation
# endif
#else
/* no threads */
__stl_atomic_t __result = *__p;
*__p = __q;
return __result;
#endif // _STLP_THREADS
}
static void* _S_swap_ptr(void* _STLP_VOLATILE* __p, void* __q) {
#if defined (_STLP_THREADS)
# if defined (_STLP_ATOMIC_EXCHANGE_PTR)
return _STLP_ATOMIC_EXCHANGE_PTR(__p, __q);
# elif defined (_STLP_ATOMIC_EXCHANGE)
_STLP_STATIC_ASSERT(sizeof(__stl_atomic_t) == sizeof(void*))
return __REINTERPRET_CAST(void*, _STLP_ATOMIC_EXCHANGE(__REINTERPRET_CAST(volatile __stl_atomic_t*, __p),
__REINTERPRET_CAST(__stl_atomic_t, __q))
);
# elif defined (_STLP_USE_ATOMIC_SWAP_MUTEX)
_S_swap_lock._M_acquire_lock();
void *__result = *__p;
*__p = __q;
_S_swap_lock._M_release_lock();
return __result;
# else
# error Missing pointer atomic swap implementation
# endif
#else
/* no thread */
void *__result = *__p;
*__p = __q;
return __result;
#endif
}
};
#if defined(__SYMBIAN32__WSD__)
# undef _S_swap_lock
#endif
#if defined (_STLP_MSVC) && (_STLP_MSVC == 1300)
# pragma warning (push)
# pragma warning (disable : 4189) //__use_ptr_atomic_swap initialized but not used
#endif
inline __stl_atomic_t _STLP_CALL _Atomic_swap(_STLP_VOLATILE __stl_atomic_t * __p, __stl_atomic_t __q) {
const int __use_ptr_atomic_swap = sizeof(__stl_atomic_t) == sizeof(void*);
return _Atomic_swap_struct<__use_ptr_atomic_swap>::_S_swap(__p, __q);
}
inline void* _STLP_CALL _Atomic_swap_ptr(void* _STLP_VOLATILE* __p, void* __q) {
const int __use_ptr_atomic_swap = sizeof(__stl_atomic_t) == sizeof(void*);
return _Atomic_swap_struct<__use_ptr_atomic_swap>::_S_swap_ptr(__p, __q);
}
#if defined (_STLP_MSVC) && (_STLP_MSVC == 1300)
# pragma warning (pop)
#endif
#if defined (_STLP_BETHREADS)
template <int __inst>
struct _STLP_beos_static_lock_data {
static bool is_init;
struct mutex_t : public _STLP_mutex {
mutex_t()
{ _STLP_beos_static_lock_data<0>::is_init = true; }
~mutex_t()
{ _STLP_beos_static_lock_data<0>::is_init = false; }
};
static mutex_t mut;
};
template <int __inst>
bool _STLP_beos_static_lock_data<__inst>::is_init = false;
template <int __inst>
typename _STLP_beos_static_lock_data<__inst>::mutex_t _STLP_beos_static_lock_data<__inst>::mut;
inline void _STLP_mutex_base::_M_acquire_lock() {
if (sem == 0) {
// we need to initialise on demand here
// to prevent race conditions use our global
// mutex if it's available:
if (_STLP_beos_static_lock_data<0>::is_init) {
_STLP_auto_lock al(_STLP_beos_static_lock_data<0>::mut);
if (sem == 0) _M_initialize();
}
else {
// no lock available, we must still be
// in startup code, THERE MUST BE ONE THREAD
// ONLY active at this point.
_M_initialize();
}
}
status_t t;
t = acquire_sem(sem);
assert(t == B_NO_ERROR);
}
#endif
_STLP_END_NAMESPACE
#if !defined (_STLP_LINK_TIME_INSTANTIATION)
# include <stl/_threads.c>
#endif
#endif /* _STLP_INTERNAL_THREADS_H */
// Local Variables:
// mode:C++
// End: