diff options
Diffstat (limited to 'src/corelib/tools')
| -rw-r--r-- | src/corelib/tools/qrefcount.h | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/src/corelib/tools/qrefcount.h b/src/corelib/tools/qrefcount.h index 17be893744..9478ff1269 100644 --- a/src/corelib/tools/qrefcount.h +++ b/src/corelib/tools/qrefcount.h @@ -56,17 +56,51 @@ namespace QtPrivate class RefCount { public: - inline void ref() { - if (atomic.load() > 0) + inline bool ref() { + int count = atomic.load(); + if (count == 0) // !isSharable + return false; + if (count != -1) // !isStatic atomic.ref(); + return true; } inline bool deref() { - if (atomic.load() <= 0) + int count = atomic.load(); + if (count == 0) // !isSharable + return false; + if (count == -1) // isStatic return true; return atomic.deref(); } + bool setSharable(bool sharable) + { + Q_ASSERT(!isShared()); + if (sharable) + return atomic.testAndSetRelaxed(0, 1); + else + return atomic.testAndSetRelaxed(1, 0); + } + + bool isStatic() const + { + // Persistent object, never deleted + return atomic.load() == -1; + } + + bool isSharable() const + { + // Sharable === Shared ownership. + return atomic.load() != 0; + } + + bool isShared() const + { + int count = atomic.load(); + return (count != 1) && (count != 0); + } + inline bool operator==(int value) const { return atomic.load() == value; } inline bool operator!=(int value) const |