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Track the initialized state of nstime_t on debug build.

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Some nstime_t operations require and assume the input nstime is initialized
(e.g. nstime_update) -- uninitialized input may cause silent failures which is
difficult to reproduce / debug.  Add an explicit flag to track the state
(limited to debug build only).

Also fixed an use case in hpa (time of last_purge).
This commit is contained in:
Qi Wang 2021-11-16 14:51:07 -08:00 • committed by Qi Wang
parent 400c59895a
commit cdabe908d0
3 changed files with 72 additions and 2 deletions
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11
include/jemalloc/internal/nstime.h
View file

@ -3,10 +3,19 @@
/* Maximum supported number of seconds (~584 years). */
#define NSTIME_SEC_MAX KQU(18446744072)
#define NSTIME_ZERO_INITIALIZER {0}
#define NSTIME_MAGIC ((uint32_t)0xb8a9ce37)
#ifdef JEMALLOC_DEBUG
# define NSTIME_ZERO_INITIALIZER {0, NSTIME_MAGIC}
#else
# define NSTIME_ZERO_INITIALIZER {0}
#endif
typedef struct {
uint64_t ns;
#ifdef JEMALLOC_DEBUG
uint32_t magic; /* Tracks if initialized. */
#endif
} nstime_t;
static const nstime_t zero = NSTIME_ZERO_INITIALIZER;