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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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248 SkAutoUnref(SkRefCnt* obj) : SkAutoTUnref<SkRefCnt>(obj) {} | 248 SkAutoUnref(SkRefCnt* obj) : SkAutoTUnref<SkRefCnt>(obj) {} |
249 }; | 249 }; |
250 #define SkAutoUnref(...) SK_REQUIRE_LOCAL_VAR(SkAutoUnref) | 250 #define SkAutoUnref(...) SK_REQUIRE_LOCAL_VAR(SkAutoUnref) |
251 | 251 |
252 // This is a variant of SkRefCnt that's Not Virtual, so weighs 4 bytes instead o
f 8 or 16. | 252 // This is a variant of SkRefCnt that's Not Virtual, so weighs 4 bytes instead o
f 8 or 16. |
253 // There's only benefit to using this if the deriving class does not otherwise n
eed a vtable. | 253 // There's only benefit to using this if the deriving class does not otherwise n
eed a vtable. |
254 template <typename Derived> | 254 template <typename Derived> |
255 class SkNVRefCnt : SkNoncopyable { | 255 class SkNVRefCnt : SkNoncopyable { |
256 public: | 256 public: |
257 SkNVRefCnt() : fRefCnt(1) {} | 257 SkNVRefCnt() : fRefCnt(1) {} |
| 258 ~SkNVRefCnt() { SkASSERTF(1 == fRefCnt, "NVRefCnt was %d", fRefCnt); } |
258 | 259 |
259 // Implementation is pretty much the same as SkRefCntBase. All required barr
iers are the same: | 260 // Implementation is pretty much the same as SkRefCntBase. All required barr
iers are the same: |
260 // - unique() needs acquire when it returns true, and no barrier if it ret
urns false; | 261 // - unique() needs acquire when it returns true, and no barrier if it ret
urns false; |
261 // - ref() doesn't need any barrier; | 262 // - ref() doesn't need any barrier; |
262 // - unref() needs a release barrier, and an acquire if it's going to call
delete. | 263 // - unref() needs a release barrier, and an acquire if it's going to call
delete. |
263 | 264 |
264 bool unique() const { return 1 == sk_acquire_load(&fRefCnt); } | 265 bool unique() const { return 1 == sk_acquire_load(&fRefCnt); } |
265 void ref() const { sk_atomic_inc(&fRefCnt); } | 266 void ref() const { sk_atomic_inc(&fRefCnt); } |
266 void unref() const { | 267 void unref() const { |
267 int32_t prevValue = sk_atomic_dec(&fRefCnt); | 268 int32_t prevValue = sk_atomic_dec(&fRefCnt); |
268 SkASSERT(prevValue >= 1); | 269 SkASSERT(prevValue >= 1); |
269 if (1 == prevValue) { | 270 if (1 == prevValue) { |
| 271 SkDEBUGCODE(fRefCnt = 1;) // restore the 1 for our destructor's as
sert |
270 SkDELETE((const Derived*)this); | 272 SkDELETE((const Derived*)this); |
271 } | 273 } |
272 } | 274 } |
273 void deref() const { this->unref(); } // Chrome prefers to call deref(). | 275 void deref() const { this->unref(); } // Chrome prefers to call deref(). |
274 | 276 |
275 protected: | |
276 #ifdef SK_DEBUG | |
277 ~SkNVRefCnt() { | |
278 SkASSERTF(0 == fRefCnt, "NVRefCnt was %d", fRefCnt); | |
279 } | |
280 #endif | |
281 | |
282 private: | 277 private: |
283 mutable int32_t fRefCnt; | 278 mutable int32_t fRefCnt; |
284 }; | 279 }; |
285 | 280 |
286 #endif | 281 #endif |
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