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/******************************************************************************/
#ifdef JEMALLOC_H_TYPES
typedef struct witness_s witness_t;
typedef unsigned witness_rank_t;
typedef ql_head(witness_t) witness_list_t;
typedef int witness_comp_t (const witness_t *, const witness_t *);
/*
* Lock ranks. Witnesses with rank WITNESS_RANK_OMIT are completely ignored by
* the witness machinery.
*/
#define WITNESS_RANK_OMIT 0U
#define WITNESS_RANK_INIT 1U
#define WITNESS_RANK_CTL 1U
#define WITNESS_RANK_ARENAS 2U
#define WITNESS_RANK_PROF_DUMP 3U
#define WITNESS_RANK_PROF_BT2GCTX 4U
#define WITNESS_RANK_PROF_TDATAS 5U
#define WITNESS_RANK_PROF_TDATA 6U
#define WITNESS_RANK_PROF_GCTX 7U
#define WITNESS_RANK_ARENA 8U
#define WITNESS_RANK_ARENA_CHUNKS 9U
#define WITNESS_RANK_ARENA_NODE_CACHE 10
#define WITNESS_RANK_BASE 11U
#define WITNESS_RANK_LEAF 0xffffffffU
#define WITNESS_RANK_ARENA_BIN WITNESS_RANK_LEAF
#define WITNESS_RANK_ARENA_HUGE WITNESS_RANK_LEAF
#define WITNESS_RANK_DSS WITNESS_RANK_LEAF
#define WITNESS_RANK_PROF_ACTIVE WITNESS_RANK_LEAF
#define WITNESS_RANK_PROF_DUMP_SEQ WITNESS_RANK_LEAF
#define WITNESS_RANK_PROF_GDUMP WITNESS_RANK_LEAF
#define WITNESS_RANK_PROF_NEXT_THR_UID WITNESS_RANK_LEAF
#define WITNESS_RANK_PROF_THREAD_ACTIVE_INIT WITNESS_RANK_LEAF
#define WITNESS_INITIALIZER(rank) {"initializer", rank, NULL, {NULL, NULL}}
#endif /* JEMALLOC_H_TYPES */
/******************************************************************************/
#ifdef JEMALLOC_H_STRUCTS
struct witness_s {
/* Name, used for printing lock order reversal messages. */
const char *name;
/*
* Witness rank, where 0 is lowest and UINT_MAX is highest. Witnesses
* must be acquired in order of increasing rank.
*/
witness_rank_t rank;
/*
* If two witnesses are of equal rank and they have the samp comp
* function pointer, it is called as a last attempt to differentiate
* between witnesses of equal rank.
*/
witness_comp_t *comp;
/* Linkage for thread's currently owned locks. */
ql_elm(witness_t) link;
};
#endif /* JEMALLOC_H_STRUCTS */
/******************************************************************************/
#ifdef JEMALLOC_H_EXTERNS
void witness_init(witness_t *witness, const char *name, witness_rank_t rank,
witness_comp_t *comp);
#ifdef JEMALLOC_JET
typedef void (witness_lock_error_t)(const witness_list_t *, const witness_t *);
extern witness_lock_error_t *witness_lock_error;
#else
void witness_lock_error(const witness_list_t *witnesses,
const witness_t *witness);
#endif
#ifdef JEMALLOC_JET
typedef void (witness_owner_error_t)(const witness_t *);
extern witness_owner_error_t *witness_owner_error;
#else
void witness_owner_error(const witness_t *witness);
#endif
#ifdef JEMALLOC_JET
typedef void (witness_not_owner_error_t)(const witness_t *);
extern witness_not_owner_error_t *witness_not_owner_error;
#else
void witness_not_owner_error(const witness_t *witness);
#endif
#ifdef JEMALLOC_JET
typedef void (witness_lockless_error_t)(const witness_list_t *);
extern witness_lockless_error_t *witness_lockless_error;
#else
void witness_lockless_error(const witness_list_t *witnesses);
#endif
void witnesses_cleanup(tsd_t *tsd);
void witness_fork_cleanup(tsd_t *tsd);
void witness_prefork(tsd_t *tsd);
void witness_postfork_parent(tsd_t *tsd);
void witness_postfork_child(tsd_t *tsd);
#endif /* JEMALLOC_H_EXTERNS */
/******************************************************************************/
#ifdef JEMALLOC_H_INLINES
#ifndef JEMALLOC_ENABLE_INLINE
bool witness_owner(tsd_t *tsd, const witness_t *witness);
void witness_assert_owner(tsdn_t *tsdn, const witness_t *witness);
void witness_assert_not_owner(tsdn_t *tsdn, const witness_t *witness);
void witness_assert_lockless(tsdn_t *tsdn);
void witness_lock(tsdn_t *tsdn, witness_t *witness);
void witness_unlock(tsdn_t *tsdn, witness_t *witness);
#endif
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_MUTEX_C_))
JEMALLOC_INLINE bool
witness_owner(tsd_t *tsd, const witness_t *witness)
{
witness_list_t *witnesses;
witness_t *w;
witnesses = tsd_witnessesp_get(tsd);
ql_foreach(w, witnesses, link) {
if (w == witness)
return (true);
}
return (false);
}
JEMALLOC_INLINE void
witness_assert_owner(tsdn_t *tsdn, const witness_t *witness)
{
tsd_t *tsd;
if (!config_debug)
return;
if (tsdn_null(tsdn))
return;
tsd = tsdn_tsd(tsdn);
if (witness->rank == WITNESS_RANK_OMIT)
return;
if (witness_owner(tsd, witness))
return;
witness_owner_error(witness);
}
JEMALLOC_INLINE void
witness_assert_not_owner(tsdn_t *tsdn, const witness_t *witness)
{
tsd_t *tsd;
witness_list_t *witnesses;
witness_t *w;
if (!config_debug)
return;
if (tsdn_null(tsdn))
return;
tsd = tsdn_tsd(tsdn);
if (witness->rank == WITNESS_RANK_OMIT)
return;
witnesses = tsd_witnessesp_get(tsd);
ql_foreach(w, witnesses, link) {
if (w == witness)
witness_not_owner_error(witness);
}
}
JEMALLOC_INLINE void
witness_assert_lockless(tsdn_t *tsdn)
{
tsd_t *tsd;
witness_list_t *witnesses;
witness_t *w;
if (!config_debug)
return;
if (tsdn_null(tsdn))
return;
tsd = tsdn_tsd(tsdn);
witnesses = tsd_witnessesp_get(tsd);
w = ql_last(witnesses, link);
if (w != NULL)
witness_lockless_error(witnesses);
}
JEMALLOC_INLINE void
witness_lock(tsdn_t *tsdn, witness_t *witness)
{
tsd_t *tsd;
witness_list_t *witnesses;
witness_t *w;
if (!config_debug)
return;
if (tsdn_null(tsdn))
return;
tsd = tsdn_tsd(tsdn);
if (witness->rank == WITNESS_RANK_OMIT)
return;
witness_assert_not_owner(tsdn, witness);
witnesses = tsd_witnessesp_get(tsd);
w = ql_last(witnesses, link);
if (w == NULL) {
/* No other locks; do nothing. */
} else if (tsd_witness_fork_get(tsd) && w->rank <= witness->rank) {
/* Forking, and relaxed ranking satisfied. */
} else if (w->rank > witness->rank) {
/* Not forking, rank order reversal. */
witness_lock_error(witnesses, witness);
} else if (w->rank == witness->rank && (w->comp == NULL || w->comp !=
witness->comp || w->comp(w, witness) > 0)) {
/*
* Missing/incompatible comparison function, or comparison
* function indicates rank order reversal.
*/
witness_lock_error(witnesses, witness);
}
ql_elm_new(witness, link);
ql_tail_insert(witnesses, witness, link);
}
JEMALLOC_INLINE void
witness_unlock(tsdn_t *tsdn, witness_t *witness)
{
tsd_t *tsd;
witness_list_t *witnesses;
if (!config_debug)
return;
if (tsdn_null(tsdn))
return;
tsd = tsdn_tsd(tsdn);
if (witness->rank == WITNESS_RANK_OMIT)
return;
/*
* Check whether owner before removal, rather than relying on
* witness_assert_owner() to abort, so that unit tests can test this
* function's failure mode without causing undefined behavior.
*/
if (witness_owner(tsd, witness)) {
witnesses = tsd_witnessesp_get(tsd);
ql_remove(witnesses, witness, link);
} else
witness_assert_owner(tsdn, witness);
}
#endif
#endif /* JEMALLOC_H_INLINES */
/******************************************************************************/
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