author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 15:26:22 +0300 | |
changeset 34 | 5fae379060a7 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* |
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* Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. |
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* |
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* Copyright (c) 1994 |
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* Hewlett-Packard Company |
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* |
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* Copyright (c) 1996,1997 |
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* Silicon Graphics Computer Systems, Inc. |
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* |
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* Copyright (c) 1997 |
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* Moscow Center for SPARC Technology |
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* |
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* Copyright (c) 1999 |
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* Boris Fomitchev |
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* |
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* This material is provided "as is", with absolutely no warranty expressed |
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* or implied. Any use is at your own risk. |
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* |
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* Permission to use or copy this software for any purpose is hereby granted |
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* without fee, provided the above notices are retained on all copies. |
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* Permission to modify the code and to distribute modified code is granted, |
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* provided the above notices are retained, and a notice that the code was |
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* modified is included with the above copyright notice. |
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* |
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*/ |
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#ifndef _STLP_THREADS_C |
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#define _STLP_THREADS_C |
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#ifndef _STLP_INTERNAL_THREADS_H |
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# include <stl/_threads.h> |
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#endif |
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#if defined (_STLP_EXPOSE_GLOBALS_IMPLEMENTATION) |
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#if defined (_STLP_SGI_THREADS) |
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# include <time.h> |
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#elif defined (_STLP_UNIX) |
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# ifndef _STLP_INTERNAL_CTIME |
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# include <stl/_ctime.h> |
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# endif |
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# if defined (_STLP_USE_NAMESPACES) && !defined (_STLP_VENDOR_GLOBAL_CSTD) |
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using _STLP_VENDOR_CSTD::time_t; |
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# endif |
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# include <sys/time.h> |
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#endif |
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_STLP_BEGIN_NAMESPACE |
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#if (_STLP_STATIC_TEMPLATE_DATA > 0) |
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# if defined (_STLP_USE_ATOMIC_SWAP_MUTEX) |
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#if !defined(__SYMBIAN32__WSD__) |
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template<int __32bits> |
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_STLP_STATIC_MUTEX |
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_Atomic_swap_struct<__32bits>::_S_swap_lock _STLP_MUTEX_INITIALIZER; |
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#endif |
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# undef _STLP_USE_ATOMIC_SWAP_MUTEX |
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# endif |
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# if defined (_STLP_THREADS) && !defined (_STLP_USE_PTHREAD_SPINLOCK) |
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//Note: For SYMBIAN Emulator, these entries are to be considered WSD. |
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//Still, EWSD solution can't be applied since it's templated. |
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template <int __inst> |
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unsigned _STLP_mutex_spin<__inst>::__max = _STLP_mutex_spin<__inst>::__low_max; |
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template <int __inst> |
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unsigned _STLP_mutex_spin<__inst>::__last = 0; |
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# endif // _STLP_USE_PTHREAD_SPINLOCK |
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#else /* ( _STLP_STATIC_TEMPLATE_DATA > 0 ) */ |
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# if defined (_STLP_USE_ATOMIC_SWAP_MUTEX) |
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__DECLARE_INSTANCE(_STLP_STATIC_MUTEX, _Atomic_swap_struct<sizeof(__stl_atomic_t) == sizeof(void*)>::_S_swap_lock, |
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_STLP_MUTEX_INITIALIZER ); |
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# undef _STLP_USE_ATOMIC_SWAP_MUTEX |
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# endif /* _STLP_PTHREADS */ |
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# if defined (_STLP_THREADS) && !defined (_STLP_USE_PTHREAD_SPINLOCK) |
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__DECLARE_INSTANCE(unsigned, _STLP_mutex_spin<0>::__max, =30); |
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__DECLARE_INSTANCE(unsigned, _STLP_mutex_spin<0>::__last, =0); |
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# endif // _STLP_USE_PTHREAD_SPINLOCK |
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#endif /* ( _STLP_STATIC_TEMPLATE_DATA > 0 ) */ |
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#if defined (_STLP_THREADS) && !defined (_STLP_USE_PTHREAD_SPINLOCK) |
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# if defined (_STLP_SPARC_SOLARIS_THREADS) |
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// underground function in libc.so; we do not want dependance on librt |
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extern "C" int __nanosleep(const struct timespec*, struct timespec*); |
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# define _STLP_NANOSLEEP __nanosleep |
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# else |
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# define _STLP_NANOSLEEP nanosleep |
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# endif |
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template <int __inst> |
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void _STLP_CALL |
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_STLP_mutex_spin<__inst>::_S_nsec_sleep(int __log_nsec) { |
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# if defined (_STLP_WIN32THREADS) |
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if (__log_nsec <= 20) { |
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101 |
// Note from boost (www.boost.org): |
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102 |
// Changed to Sleep(1) from Sleep(0). |
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103 |
// According to MSDN, Sleep(0) will never yield |
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104 |
// to a lower-priority thread, whereas Sleep(1) |
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105 |
// will. Performance seems not to be affected. |
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106 |
Sleep(1); |
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107 |
} else { |
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108 |
Sleep(1 << (__log_nsec - 20)); |
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109 |
} |
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110 |
# elif defined(_STLP_OS2THREADS) |
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111 |
if (__log_nsec <= 20) { |
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112 |
DosSleep(0); |
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113 |
} else { |
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114 |
DosSleep(1 << (__log_nsec - 20)); |
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115 |
} |
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# elif defined (_STLP_UNIX) |
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117 |
timespec __ts; |
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/* Max sleep is 2**27nsec ~ 60msec */ |
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__ts.tv_sec = 0; |
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__ts.tv_nsec = 1 << __log_nsec; |
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_STLP_NANOSLEEP(&__ts, 0); |
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122 |
# endif |
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123 |
} |
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124 |
|
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125 |
template <int __inst> |
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126 |
void _STLP_CALL |
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_STLP_mutex_spin<__inst>::_M_do_lock(volatile __stl_atomic_t* __lock) { |
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# if defined(_STLP_ATOMIC_EXCHANGE) |
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if (_Atomic_swap(__lock, 1)) { |
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unsigned __my_spin_max = _STLP_mutex_spin<0>::__max; |
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unsigned __my_last_spins = _STLP_mutex_spin<0>::__last; |
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volatile unsigned __junk = 17; // Value doesn't matter. |
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133 |
unsigned __i; |
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134 |
|
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135 |
for (__i = 0; __i < __my_spin_max; ++__i) { |
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if (__i < __my_last_spins/2 || *__lock) { |
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__junk *= __junk; __junk *= __junk; |
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__junk *= __junk; __junk *= __junk; |
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139 |
} else { |
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140 |
if (!_Atomic_swap(__lock, 1)) { |
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141 |
// got it! |
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142 |
// Spinning worked. Thus we're probably not being scheduled |
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// against the other process with which we were contending. |
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// Thus it makes sense to spin longer the next time. |
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_STLP_mutex_spin<0>::__last = __i; |
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_STLP_mutex_spin<0>::__max = _STLP_mutex_spin<0>::__high_max; |
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147 |
return; |
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148 |
} |
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149 |
} |
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150 |
} |
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151 |
|
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152 |
// We are probably being scheduled against the other process. Sleep. |
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_STLP_mutex_spin<0>::__max = _STLP_mutex_spin<0>::__low_max; |
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154 |
|
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155 |
for (__i = 0 ;; ++__i) { |
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int __log_nsec = __i + 6; |
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157 |
|
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if (__log_nsec > 27) __log_nsec = 27; |
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159 |
if (!_Atomic_swap(__lock, 1)) { |
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160 |
break; |
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161 |
} |
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_S_nsec_sleep(__log_nsec); |
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163 |
} |
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} /* first _Atomic_swap */ |
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# endif |
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166 |
} |
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#endif // _STLP_USE_PTHREAD_SPINLOCK |
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168 |
|
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_STLP_END_NAMESPACE |
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170 |
|
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#endif /* _STLP_EXPOSE_GLOBALS_IMPLEMENTATION */ |
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#endif /* _STLP_THREADS_C */ |
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173 |
|
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// Local Variables: |
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// mode:C++ |
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176 |
// End: |