third_party/ulib/jemalloc/include/jemalloc/internal/tcache_structs.h

#ifndef JEMALLOC_INTERNAL_TCACHE_STRUCTS_H
#define JEMALLOC_INTERNAL_TCACHE_STRUCTS_H

typedef enum {
	tcache_enabled_false   = 0, /* Enable cast to/from bool. */
	tcache_enabled_true    = 1,
	tcache_enabled_default = 2
} tcache_enabled_t;

/*
 * Read-only information associated with each element of tcache_t's tbins array
 * is stored separately, mainly to reduce memory usage.
 */
struct tcache_bin_info_s {
	unsigned	ncached_max;	/* Upper limit on ncached. */
};

struct tcache_bin_s {
	tcache_bin_stats_t tstats;
	int		low_water;	/* Min # cached since last GC. */
	unsigned	lg_fill_div;	/* Fill (ncached_max >> lg_fill_div). */
	unsigned	ncached;	/* # of cached objects. */
	/*
	 * To make use of adjacent cacheline prefetch, the items in the avail
	 * stack goes to higher address for newer allocations.  avail points
	 * just above the available space, which means that
	 * avail[-ncached, ... -1] are available items and the lowest item will
	 * be allocated first.
	 */
	void		**avail;	/* Stack of available objects. */
};

struct tcache_s {
	ql_elm(tcache_t) link;		/* Used for aggregating stats. */
	uint64_t	prof_accumbytes;/* Cleared after arena_prof_accum(). */
	ticker_t	gc_ticker;	/* Drives incremental GC. */
	szind_t		next_gc_bin;	/* Next bin to GC. */
	tcache_bin_t	tbins[1];	/* Dynamically sized. */
	/*
	 * The pointer stacks associated with tbins follow as a contiguous
	 * array.  During tcache initialization, the avail pointer in each
	 * element of tbins is initialized to point to the proper offset within
	 * this array.
	 */
};

/* Linkage for list of available (previously used) explicit tcache IDs. */
struct tcaches_s {
	union {
		tcache_t	*tcache;
		tcaches_t	*next;
	};
};

#endif /* JEMALLOC_INTERNAL_TCACHE_STRUCTS_H */