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1 | 1 |
2 /* | 2 /* |
3 * Copyright 2006 The Android Open Source Project | 3 * Copyright 2006 The Android Open Source Project |
4 * | 4 * |
5 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 6 * found in the LICENSE file. |
7 */ | 7 */ |
8 | 8 |
9 | 9 |
10 #ifndef SkRefCnt_DEFINED | 10 #ifndef SkRefCnt_DEFINED |
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240 T* fObj; | 240 T* fObj; |
241 }; | 241 }; |
242 // Can't use the #define trick below to guard a bare SkAutoTUnref(...) because i
t's templated. :( | 242 // Can't use the #define trick below to guard a bare SkAutoTUnref(...) because i
t's templated. :( |
243 | 243 |
244 class SkAutoUnref : public SkAutoTUnref<SkRefCnt> { | 244 class SkAutoUnref : public SkAutoTUnref<SkRefCnt> { |
245 public: | 245 public: |
246 SkAutoUnref(SkRefCnt* obj) : SkAutoTUnref<SkRefCnt>(obj) {} | 246 SkAutoUnref(SkRefCnt* obj) : SkAutoTUnref<SkRefCnt>(obj) {} |
247 }; | 247 }; |
248 #define SkAutoUnref(...) SK_REQUIRE_LOCAL_VAR(SkAutoUnref) | 248 #define SkAutoUnref(...) SK_REQUIRE_LOCAL_VAR(SkAutoUnref) |
249 | 249 |
| 250 // This is a variant of SkRefCnt that's Not Virtual, so weighs 4 bytes instead o
f 8 or 16. |
| 251 // There's only benefit to using this if the deriving class does not otherwise n
eed a vtable. |
| 252 template <typename Derived> |
| 253 class SkNVRefCnt : SkNoncopyable { |
| 254 public: |
| 255 SkNVRefCnt() : fRefCnt(1) {} |
| 256 |
| 257 // Implementation is pretty much the same as SkRefCntBase. All required barr
iers are the same: |
| 258 // - unique() needs acquire when it returns true, and no barrier if it ret
urns false; |
| 259 // - ref() doesn't need any barrier; |
| 260 // - unref() needs a release barrier, and an acquire if it's going to call
delete. |
| 261 |
| 262 bool unique() const { return 1 == sk_acquire_load(&fRefCnt); } |
| 263 void ref() const { sk_atomic_inc(&fRefCnt); } |
| 264 void unref() const { if (1 == sk_atomic_dec(&fRefCnt)) { SkDELETE((const De
rived*)this); } } |
| 265 private: |
| 266 mutable int32_t fRefCnt; |
| 267 }; |
| 268 |
250 #endif | 269 #endif |
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