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ICU-10407 more efficient UnicodeString::refCount()

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X-SVN-Rev: 34367
This commit is contained in:
Markus Scherer 2013-09-17 21:59:18 +00:00
parent 25bab8fa6f
commit 36663e1226
1 changed files with 9 additions and 13 deletions
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22
icu4c/source/common/unistr.cpp
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@ -117,23 +117,19 @@ operator+ (const UnicodeString &s1, const UnicodeString &s2) {
//======================================== //========================================
void void
UnicodeString::addRef() UnicodeString::addRef() {
{ umtx_atomic_inc((u_atomic_int32_t *)fUnion.fFields.fArray - 1);} umtx_atomic_inc((u_atomic_int32_t *)fUnion.fFields.fArray - 1);
}
int32_t int32_t
UnicodeString::removeRef() UnicodeString::removeRef() {
{ return umtx_atomic_dec((u_atomic_int32_t *)fUnion.fFields.fArray - 1);} return umtx_atomic_dec((u_atomic_int32_t *)fUnion.fFields.fArray - 1);
}
int32_t int32_t
UnicodeString::refCount() const UnicodeString::refCount() const {
{ return umtx_loadAcquire(*((u_atomic_int32_t *)fUnion.fFields.fArray - 1));
umtx_lock(NULL); }
// Note: without the lock to force a memory barrier, we might see a very
// stale value on some multi-processor systems.
int32_t count = *((int32_t *)fUnion.fFields.fArray - 1);
umtx_unlock(NULL);
return count;
}
void void
UnicodeString::releaseArray() { UnicodeString::releaseArray() {