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# qatomic_i386.h

Go to the documentation of this file.

    00001 /****************************************************************************
    00002 **
    00003 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
    00004 ** All rights reserved.
    00005 ** Contact: Nokia Corporation (qt-info@nokia.com)
    00006 **
    00007 ** This file is part of the QtCore module of the Qt Toolkit.
    00008 **
    00009 ** $QT_BEGIN_LICENSE:LGPL$
    00010 ** Commercial Usage
    00011 ** Licensees holding valid Qt Commercial licenses may use this file in
    00012 ** accordance with the Qt Commercial License Agreement provided with the
    00013 ** Software or, alternatively, in accordance with the terms contained in
    00014 ** a written agreement between you and Nokia.
    00015 **
    00016 ** GNU Lesser General Public License Usage
    00017 ** Alternatively, this file may be used under the terms of the GNU Lesser
    00018 ** General Public License version 2.1 as published by the Free Software
    00019 ** Foundation and appearing in the file LICENSE.LGPL included in the
    00020 ** packaging of this file.  Please review the following information to
    00021 ** ensure the GNU Lesser General Public License version 2.1 requirements
    00022 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    00023 **
    00024 ** In addition, as a special exception, Nokia gives you certain additional
    00025 ** rights.  These rights are described in the Nokia Qt LGPL Exception
    00026 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this module.
    00027 **
    00028 ** GNU General Public License Usage
    00029 ** Alternatively, this file may be used under the terms of the GNU
    00030 ** General Public License version 3.0 as published by the Free Software
    00031 ** Foundation and appearing in the file LICENSE.GPL included in the
    00032 ** packaging of this file.  Please review the following information to
    00033 ** ensure the GNU General Public License version 3.0 requirements will be
    00034 ** met: http://www.gnu.org/copyleft/gpl.html.
    00035 **
    00036 ** If you have questions regarding the use of this file, please contact
    00037 ** Nokia at qt-info@nokia.com.
    00038 ** $QT_END_LICENSE$
    00039 **
    00040 ****************************************************************************/
    00041
    00042 #ifndef QATOMIC_I386_H
    00043 #define QATOMIC_I386_H
    00044
    00045 QT_BEGIN_HEADER
    00046 QT_BEGIN_NAMESPACE
    00047
    00048 #define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_ALWAYS_NATIVE
    00049 #define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_WAIT_FREE
    00050
    00051 inline bool QBasicAtomicInt::isReferenceCountingNative()
    00052 { return true; }
    00053 inline bool QBasicAtomicInt::isReferenceCountingWaitFree()
    00054 { return true; }
    00055
    00056 #define Q_ATOMIC_INT_TEST_AND_SET_IS_ALWAYS_NATIVE
    00057 #define Q_ATOMIC_INT_TEST_AND_SET_IS_WAIT_FREE
    00058
    00059 inline bool QBasicAtomicInt::isTestAndSetNative()
    00060 { return true; }
    00061 inline bool QBasicAtomicInt::isTestAndSetWaitFree()
    00062 { return true; }
    00063
    00064 #define Q_ATOMIC_INT_FETCH_AND_STORE_IS_ALWAYS_NATIVE
    00065 #define Q_ATOMIC_INT_FETCH_AND_STORE_IS_WAIT_FREE
    00066
    00067 inline bool QBasicAtomicInt::isFetchAndStoreNative()
    00068 { return true; }
    00069 inline bool QBasicAtomicInt::isFetchAndStoreWaitFree()
    00070 { return true; }
    00071
    00072 #define Q_ATOMIC_INT_FETCH_AND_ADD_IS_ALWAYS_NATIVE
    00073 #define Q_ATOMIC_INT_FETCH_AND_ADD_IS_WAIT_FREE
    00074
    00075 inline bool QBasicAtomicInt::isFetchAndAddNative()
    00076 { return true; }
    00077 inline bool QBasicAtomicInt::isFetchAndAddWaitFree()
    00078 { return true; }
    00079
    00080 #define Q_ATOMIC_POINTER_TEST_AND_SET_IS_ALWAYS_NATIVE
    00081 #define Q_ATOMIC_POINTER_TEST_AND_SET_IS_WAIT_FREE
    00082
    00083 template <typename T>
    00084 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetNative()
    00085 { return true; }
    00086 template <typename T>
    00087 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetWaitFree()
    00088 { return true; }
    00089
    00090 #define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_ALWAYS_NATIVE
    00091 #define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_WAIT_FREE
    00092
    00093 template <typename T>
    00094 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreNative()
    00095 { return true; }
    00096 template <typename T>
    00097 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreWaitFree()
    00098 { return true; }
    00099
    00100 #define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_ALWAYS_NATIVE
    00101 #define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_WAIT_FREE
    00102
    00103 template <typename T>
    00104 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddNative()
    00105 { return true; }
    00106 template <typename T>
    00107 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree()
    00108 { return true; }
    00109
    00110 #if defined(Q_CC_GNU) || defined(Q_CC_INTEL)
    00111
    00112 inline bool QBasicAtomicInt::ref()
    00113 {
    00114     unsigned char ret;
    00115     asm volatile("lock\n"
    00116                  "incl %0\n"
    00117                  "setne %1"
    00118                  : "=m" (_q_value), "=qm" (ret)
    00119                  : "m" (_q_value)
    00120                  : "memory");
    00121     return ret != 0;
    00122 }
    00123
    00124 inline bool QBasicAtomicInt::deref()
    00125 {
    00126         unsigned char ret;
    00127     asm volatile("lock\n"
    00128                  "decl %0\n"
    00129                  "setne %1"
    00130                  : "=m" (_q_value), "=qm" (ret)
    00131                  : "m" (_q_value)
    00132                  : "memory");
    00133     return ret != 0;
    00134 }
    00135
    00136 inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
    00137 {
    00138     unsigned char ret;
    00139     asm volatile("lock\n"
    00140                  "cmpxchgl %3,%2\n"
    00141                  "sete %1\n"
    00142                  : "=a" (newValue), "=qm" (ret), "+m" (_q_value)
    00143                  : "r" (newValue), "0" (expectedValue)
    00144                  : "memory");
    00145     return ret != 0;
    00146 }
    00147
    00148 inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
    00149 {
    00150     asm volatile("xchgl %0,%1"
    00151                  : "=r" (newValue), "+m" (_q_value)
    00152                  : "0" (newValue)
    00153                  : "memory");
    00154     return newValue;
    00155 }
    00156
    00157 inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
    00158 {
    00159     asm volatile("lock\n"
    00160                  "xaddl %0,%1"
    00161                  : "=r" (valueToAdd), "+m" (_q_value)
    00162                  : "0" (valueToAdd)
    00163                  : "memory");
    00164     return valueToAdd;
    00165 }
    00166
    00167 template <typename T>
    00168 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
    00169 {
    00170     unsigned char ret;
    00171     asm volatile("lock\n"
    00172                  "cmpxchgl %3,%2\n"
    00173                  "sete %1\n"
    00174                  : "=a" (newValue), "=qm" (ret), "+m" (_q_value)
    00175                  : "r" (newValue), "0" (expectedValue)
    00176                  : "memory");
    00177     return ret != 0;
    00178 }
    00179
    00180 template <typename T>
    00181 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
    00182 {
    00183     asm volatile("xchgl %0,%1"
    00184                  : "=r" (newValue), "+m" (_q_value)
    00185                  : "0" (newValue)
    00186                  : "memory");
    00187     return newValue;
    00188 }
    00189
    00190 template <typename T>
    00191 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd)
    00192 {
    00193     asm volatile("lock\n"
    00194                  "xaddl %0,%1"
    00195                  : "=r" (valueToAdd), "+m" (_q_value)
    00196                  : "0" (valueToAdd * sizeof(T))
    00197                  : "memory");
    00198     return reinterpret_cast<T *>(valueToAdd);
    00199 }
    00200
    00201 #else
    00202
    00203 extern "C" {
    00204     Q_CORE_EXPORT int q_atomic_test_and_set_int(volatile int *ptr, int expected, int newval);
    00205     Q_CORE_EXPORT int q_atomic_test_and_set_ptr(volatile void *ptr, void *expected, void *newval);
    00206     Q_CORE_EXPORT int q_atomic_increment(volatile int *ptr);
    00207     Q_CORE_EXPORT int q_atomic_decrement(volatile int *ptr);
    00208     Q_CORE_EXPORT int q_atomic_set_int(volatile int *ptr, int newval);
    00209     Q_CORE_EXPORT void *q_atomic_set_ptr(volatile void *ptr, void *newval);
    00210     Q_CORE_EXPORT int q_atomic_fetch_and_add_int(volatile int *ptr, int value);
    00211     Q_CORE_EXPORT void *q_atomic_fetch_and_add_ptr(volatile void *ptr, int value);
    00212 } // extern "C"
    00213
    00214 inline bool QBasicAtomicInt::ref()
    00215 {
    00216     return q_atomic_increment(&_q_value) != 0;
    00217 }
    00218
    00219 inline bool QBasicAtomicInt::deref()
    00220 {
    00221     return q_atomic_decrement(&_q_value) != 0;
    00222 }
    00223
    00224 inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
    00225 {
    00226     return q_atomic_test_and_set_int(&_q_value, expectedValue, newValue) != 0;
    00227 }
    00228
    00229 inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
    00230 {
    00231     return q_atomic_set_int(&_q_value, newValue);
    00232 }
    00233
    00234 inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
    00235 {
    00236     return q_atomic_fetch_and_add_int(&_q_value, valueToAdd);
    00237 }
    00238
    00239 template <typename T>
    00240 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
    00241 {
    00242     return q_atomic_test_and_set_ptr(&_q_value, expectedValue, newValue);
    00243 }
    00244
    00245 template <typename T>
    00246 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
    00247 {
    00248     return reinterpret_cast<T *>(q_atomic_set_ptr(&_q_value, newValue));
    00249 }
    00250
    00251 template <typename T>
    00252 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd)
    00253 {
    00254     return reinterpret_cast<T *>(q_atomic_fetch_and_add_ptr(&_q_value, valueToAdd * sizeof(T)));
    00255 }
    00256
    00257 #endif
    00258
    00259 inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue)
    00260 {
    00261     return testAndSetOrdered(expectedValue, newValue);
    00262 }
    00263
    00264 inline bool QBasicAtomicInt::testAndSetAcquire(int expectedValue, int newValue)
    00265 {
    00266     return testAndSetOrdered(expectedValue, newValue);
    00267 }
    00268
    00269 inline bool QBasicAtomicInt::testAndSetRelease(int expectedValue, int newValue)
    00270 {
    00271     return testAndSetOrdered(expectedValue, newValue);
    00272 }
    00273
    00274 inline int QBasicAtomicInt::fetchAndStoreRelaxed(int newValue)
    00275 {
    00276     return fetchAndStoreOrdered(newValue);
    00277 }
    00278
    00279 inline int QBasicAtomicInt::fetchAndStoreAcquire(int newValue)
    00280 {
    00281     return fetchAndStoreOrdered(newValue);
    00282 }
    00283
    00284 inline int QBasicAtomicInt::fetchAndStoreRelease(int newValue)
    00285 {
    00286     return fetchAndStoreOrdered(newValue);
    00287 }
    00288
    00289 inline int QBasicAtomicInt::fetchAndAddRelaxed(int valueToAdd)
    00290 {
    00291     return fetchAndAddOrdered(valueToAdd);
    00292 }
    00293
    00294 inline int QBasicAtomicInt::fetchAndAddAcquire(int valueToAdd)
    00295 {
    00296     return fetchAndAddOrdered(valueToAdd);
    00297 }
    00298
    00299 inline int QBasicAtomicInt::fetchAndAddRelease(int valueToAdd)
    00300 {
    00301     return fetchAndAddOrdered(valueToAdd);
    00302 }
    00303
    00304 template <typename T>
    00305 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValue, T *newValue)
    00306 {
    00307     return testAndSetOrdered(expectedValue, newValue);
    00308 }
    00309
    00310 template <typename T>
    00311 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetAcquire(T *expectedValue, T *newValue)
    00312 {
    00313     return testAndSetOrdered(expectedValue, newValue);
    00314 }
    00315
    00316 template <typename T>
    00317 Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelease(T *expectedValue, T *newValue)
    00318 {
    00319     return testAndSetOrdered(expectedValue, newValue);
    00320 }
    00321
    00322 template <typename T>
    00323 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue)
    00324 {
    00325     return fetchAndStoreOrdered(newValue);
    00326 }
    00327
    00328 template <typename T>
    00329 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreAcquire(T *newValue)
    00330 {
    00331     return fetchAndStoreOrdered(newValue);
    00332 }
    00333
    00334 template <typename T>
    00335 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelease(T *newValue)
    00336 {
    00337     return fetchAndStoreOrdered(newValue);
    00338 }
    00339
    00340 template <typename T>
    00341 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(qptrdiff valueToAdd)
    00342 {
    00343     return fetchAndAddOrdered(valueToAdd);
    00344 }
    00345
    00346 template <typename T>
    00347 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddAcquire(qptrdiff valueToAdd)
    00348 {
    00349     return fetchAndAddOrdered(valueToAdd);
    00350 }
    00351
    00352 template <typename T>
    00353 Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelease(qptrdiff valueToAdd)
    00354 {
    00355     return fetchAndAddOrdered(valueToAdd);
    00356 }
    00357
    00358 QT_END_NAMESPACE
    00359 QT_END_HEADER
    00360
    00361 #endif // QATOMIC_I386_H