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| 1 /* | 1 /* |
| 2 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved. | 2 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * This library is free software; you can redistribute it and/or | 4 * This library is free software; you can redistribute it and/or |
| 5 * modify it under the terms of the GNU Library General Public | 5 * modify it under the terms of the GNU Library General Public |
| 6 * License as published by the Free Software Foundation; either | 6 * License as published by the Free Software Foundation; either |
| 7 * version 2 of the License, or (at your option) any later version. | 7 * version 2 of the License, or (at your option) any later version. |
| 8 * | 8 * |
| 9 * This library is distributed in the hope that it will be useful, | 9 * This library is distributed in the hope that it will be useful, |
| 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 * Library General Public License for more details. | 12 * Library General Public License for more details. |
| 13 * | 13 * |
| 14 * You should have received a copy of the GNU Library General Public License | 14 * You should have received a copy of the GNU Library General Public License |
| 15 * along with this library; see the file COPYING.LIB. If not, write to | 15 * along with this library; see the file COPYING.LIB. If not, write to |
| 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 17 * Boston, MA 02110-1301, USA. | 17 * Boston, MA 02110-1301, USA. |
| 18 * | 18 * |
| 19 */ | 19 */ |
| 20 | 20 |
| 21 #ifndef RefCounted_h | 21 #ifndef RefCounted_h |
| 22 #define RefCounted_h | 22 #define RefCounted_h |
| 23 | 23 |
| 24 #include <wtf/Assertions.h> | 24 #include "wtf/Assertions.h" |
| 25 #include <wtf/FastAllocBase.h> | 25 #include "wtf/FastAllocBase.h" |
| 26 #include <wtf/Noncopyable.h> | 26 #include "wtf/Noncopyable.h" |
| 27 #include <wtf/OwnPtr.h> | 27 #include "wtf/OwnPtr.h" |
| 28 #include <wtf/ThreadRestrictionVerifier.h> | 28 #include "wtf/ThreadRestrictionVerifier.h" |
| 29 #include <wtf/UnusedParam.h> | 29 #include "wtf/UnusedParam.h" |
| 30 #include "wtf/WTFExport.h" |
| 30 | 31 |
| 31 namespace WTF { | 32 namespace WTF { |
| 32 | 33 |
| 33 #ifdef NDEBUG | 34 #ifdef NDEBUG |
| 34 #define CHECK_REF_COUNTED_LIFECYCLE 0 | 35 #define CHECK_REF_COUNTED_LIFECYCLE 0 |
| 35 #else | 36 #else |
| 36 #define CHECK_REF_COUNTED_LIFECYCLE 1 | 37 #define CHECK_REF_COUNTED_LIFECYCLE 1 |
| 37 #endif | 38 #endif |
| 38 | 39 |
| 39 // This base class holds the non-template methods and attributes. | 40 // This base class holds the non-template methods and attributes. |
| 40 // The RefCounted class inherits from it reducing the template bloat | 41 // The RefCounted class inherits from it reducing the template bloat |
| 41 // generated by the compiler (technique called template hoisting). | 42 // generated by the compiler (technique called template hoisting). |
| 42 class RefCountedBase { | 43 class WTF_EXPORT RefCountedBase { |
| 43 public: | 44 public: |
| 44 void ref() | 45 void ref() |
| 45 { | 46 { |
| 46 #if CHECK_REF_COUNTED_LIFECYCLE | 47 #if CHECK_REF_COUNTED_LIFECYCLE |
| 47 // Start thread verification as soon as the ref count gets to 2. This | 48 // Start thread verification as soon as the ref count gets to 2. This |
| 48 // heuristic reflects the fact that items are often created on one threa
d | 49 // heuristic reflects the fact that items are often created on one threa
d |
| 49 // and then given to another thread to be used. | 50 // and then given to another thread to be used. |
| 50 // FIXME: Make this restriction tigher. Especially as we move to more | 51 // FIXME: Make this restriction tigher. Especially as we move to more |
| 51 // common methods for sharing items across threads like CrossThreadCopie
r.h | 52 // common methods for sharing items across threads like CrossThreadCopie
r.h |
| 52 // We should be able to add a "detachFromThread" method to make this exp
licit. | 53 // We should be able to add a "detachFromThread" method to make this exp
licit. |
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| 195 { | 196 { |
| 196 } | 197 } |
| 197 }; | 198 }; |
| 198 | 199 |
| 199 } // namespace WTF | 200 } // namespace WTF |
| 200 | 201 |
| 201 using WTF::RefCounted; | 202 using WTF::RefCounted; |
| 202 using WTF::RefCountedCustomAllocated; | 203 using WTF::RefCountedCustomAllocated; |
| 203 | 204 |
| 204 #endif // RefCounted_h | 205 #endif // RefCounted_h |
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