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00048 #ifndef __SGI_STL_INTERNAL_THREADS_H
00049 #define __SGI_STL_INTERNAL_THREADS_H
00050
00051
00052 #include "bits/gthr.h"
00053
00054 namespace std
00055 {
00056
00057
00058
00059
00060 struct _Refcount_Base
00061 {
00062
00063 typedef size_t _RC_t;
00064
00065
00066 volatile _RC_t _M_ref_count;
00067
00068
00069 __gthread_mutex_t _M_ref_count_lock;
00070
00071 _Refcount_Base(_RC_t __n) : _M_ref_count(__n)
00072 {
00073 #ifdef __GTHREAD_MUTEX_INIT
00074 __gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
00075 _M_ref_count_lock = __tmp;
00076 #elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00077 __GTHREAD_MUTEX_INIT_FUNCTION (&_M_ref_count_lock);
00078 #else
00079 #error __GTHREAD_MUTEX_INIT or __GTHREAD_MUTEX_INIT_FUNCTION should be defined by gthr.h abstraction layer, report problem to libstdc++@gcc.gnu.org.
00080 #endif
00081 }
00082
00083 void
00084 _M_incr()
00085 {
00086 __gthread_mutex_lock(&_M_ref_count_lock);
00087 ++_M_ref_count;
00088 __gthread_mutex_unlock(&_M_ref_count_lock);
00089 }
00090
00091 _RC_t
00092 _M_decr()
00093 {
00094 __gthread_mutex_lock(&_M_ref_count_lock);
00095 volatile _RC_t __tmp = --_M_ref_count;
00096 __gthread_mutex_unlock(&_M_ref_count_lock);
00097 return __tmp;
00098 }
00099 };
00100
00101
00102
00103
00104
00105 #if defined (__GTHREAD_MUTEX_INIT)
00106
00107
00108
00109 template<int __dummy>
00110 struct _Swap_lock_struct
00111 { static __gthread_mutex_t _S_swap_lock; };
00112
00113 template<int __dummy>
00114 __gthread_mutex_t
00115 _Swap_lock_struct<__dummy>::_S_swap_lock = __GTHREAD_MUTEX_INIT;
00116
00117
00118
00119 inline unsigned long
00120 _Atomic_swap(unsigned long * __p, unsigned long __q)
00121 {
00122 __gthread_mutex_lock(&_Swap_lock_struct<0>::_S_swap_lock);
00123 unsigned long __result = *__p;
00124 *__p = __q;
00125 __gthread_mutex_unlock(&_Swap_lock_struct<0>::_S_swap_lock);
00126 return __result;
00127 }
00128 #endif
00129
00130
00131
00132
00133
00134
00135
00136
00137
00138
00139
00140
00141
00142
00143 #if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00144 extern __gthread_mutex_t _GLIBCPP_mutex;
00145 extern __gthread_mutex_t *_GLIBCPP_mutex_address;
00146 extern __gthread_once_t _GLIBCPP_once;
00147 extern void _GLIBCPP_mutex_init (void);
00148 extern void _GLIBCPP_mutex_address_init (void);
00149 #endif
00150
00151 struct _STL_mutex_lock
00152 {
00153
00154 #if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00155 volatile int _M_init_flag;
00156 __gthread_once_t _M_once;
00157 #endif
00158 __gthread_mutex_t _M_lock;
00159
00160 void
00161 _M_initialize()
00162 {
00163 #ifdef __GTHREAD_MUTEX_INIT
00164
00165 #elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00166 if (_M_init_flag) return;
00167 if (__gthread_once (&_GLIBCPP_once, _GLIBCPP_mutex_init) != 0
00168 && __gthread_active_p ())
00169 abort ();
00170 __gthread_mutex_lock (&_GLIBCPP_mutex);
00171 if (!_M_init_flag)
00172 {
00173
00174
00175
00176 _GLIBCPP_mutex_address = &_M_lock;
00177 if (__gthread_once (&_M_once, _GLIBCPP_mutex_address_init) != 0
00178 && __gthread_active_p ())
00179 abort ();
00180 _M_init_flag = 1;
00181 }
00182 __gthread_mutex_unlock (&_GLIBCPP_mutex);
00183 #endif
00184 }
00185
00186 void
00187 _M_acquire_lock()
00188 {
00189 #if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00190 if (!_M_init_flag) _M_initialize();
00191 #endif
00192 __gthread_mutex_lock(&_M_lock);
00193 }
00194
00195 void
00196 _M_release_lock()
00197 {
00198 #if !defined(__GTHREAD_MUTEX_INIT) && defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00199 if (!_M_init_flag) _M_initialize();
00200 #endif
00201 __gthread_mutex_unlock(&_M_lock);
00202 }
00203 };
00204
00205 #ifdef __GTHREAD_MUTEX_INIT
00206 #define __STL_MUTEX_INITIALIZER = { __GTHREAD_MUTEX_INIT }
00207 #elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
00208 #ifdef __GTHREAD_MUTEX_INIT_DEFAULT
00209 #define __STL_MUTEX_INITIALIZER \
00210 = { 0, __GTHREAD_ONCE_INIT, __GTHREAD_MUTEX_INIT_DEFAULT }
00211 #else
00212 #define __STL_MUTEX_INITIALIZER = { 0, __GTHREAD_ONCE_INIT }
00213 #endif
00214 #endif
00215
00216
00217
00218
00219
00220 struct _STL_auto_lock
00221 {
00222 _STL_mutex_lock& _M_lock;
00223
00224 _STL_auto_lock(_STL_mutex_lock& __lock) : _M_lock(__lock)
00225 { _M_lock._M_acquire_lock(); }
00226
00227 ~_STL_auto_lock() { _M_lock._M_release_lock(); }
00228
00229 private:
00230 void operator=(const _STL_auto_lock&);
00231 _STL_auto_lock(const _STL_auto_lock&);
00232 };
00233
00234 }
00235
00236 #endif