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Make isc_refcount_current() atomically read the counter value (#46074)

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This commit is contained in:
Mukund Sivaraman
2017-09-27 15:08:06 +05:30
parent 2495de04a5
commit abb8813a33
2 changed files with 12 additions and 3 deletions
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3
CHANGES
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@@ -1,3 +1,6 @@
4741. [bug] Make isc_refcount_current() atomically read the
counter value. [RT #46074]
4740. [cleanup] Avoid triggering format-truncated warnings. [RT #46107]
4739. [cleanup] Address clang static analysis warnings. [RT #45952]

12
lib/isc/include/isc/refcount.h
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@@ -104,11 +104,13 @@ typedef struct isc_refcount {
#endif
} isc_refcount_t;
#define isc_refcount_destroy(rp) REQUIRE((rp)->refs == 0)
#define isc_refcount_current(rp) ((unsigned int)((rp)->refs))
#if defined(ISC_REFCOUNT_HAVESTDATOMIC)
#define isc_refcount_current(rp) \
((unsigned int)(atomic_load_explicit(&(rp)->refs, \
memory_order_relaxed)))
#define isc_refcount_destroy(rp) REQUIRE(isc_refcount_current(rp) == 0)
#define isc_refcount_increment0(rp, tp) \
do { \
unsigned int *_tmp = (unsigned int *)(tp); \
@@ -143,6 +145,10 @@ typedef struct isc_refcount {
#else /* ISC_REFCOUNT_HAVESTDATOMIC */
#define isc_refcount_current(rp) \
((unsigned int)(isc_atomic_xadd(&(rp)->refs, 0)))
#define isc_refcount_destroy(rp) REQUIRE(isc_refcount_current(rp) == 0)
#define isc_refcount_increment0(rp, tp) \
do { \
unsigned int *_tmp = (unsigned int *)(tp); \