text: #ifndef JEMALLOC_INTERNAL_EXTERNS_H
  #define JEMALLOC_INTERNAL_EXTERNS_H
  
  #include "jemalloc/internal/atomic.h"
  #include "jemalloc/internal/tsd_types.h"
  
  /* TSD checks this to set thread local slow state accordingly. */
  extern bool malloc_slow;
  
  /* Run-time options. */
  extern bool opt_abort;
  extern bool opt_abort_conf;
  extern const char *opt_junk;
  extern bool opt_junk_alloc;
  extern bool opt_junk_free;
  extern bool opt_utrace;
  extern bool opt_xmalloc;
  extern bool opt_zero;
  extern unsigned opt_narenas;
  
  /* Number of CPUs. */
  extern unsigned ncpus;
  
  /* Number of arenas used for automatic multiplexing of threads and arenas. */
  extern unsigned narenas_auto;
  
  /* Base index for manual arenas. */
  extern unsigned manual_arena_base;
  
  /*
   * Arenas that are used to service external requests.  Not all elements of the
   * arenas array are necessarily used; arenas are created lazily as needed.
   */
  extern atomic_p_t arenas[];
  
  void *a0malloc(size_t size);
  void a0dalloc(void *ptr);
  void *bootstrap_malloc(size_t size);
  void *bootstrap_calloc(size_t num, size_t size);
  void bootstrap_free(void *ptr);
  void arena_set(unsigned ind, arena_t *arena);
  unsigned narenas_total_get(void);
  arena_t *arena_init(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks);
  arena_tdata_t *arena_tdata_get_hard(tsd_t *tsd, unsigned ind);
  arena_t *arena_choose_hard(tsd_t *tsd, bool internal);
  void arena_migrate(tsd_t *tsd, unsigned oldind, unsigned newind);
  void iarena_cleanup(tsd_t *tsd);
  void arena_cleanup(tsd_t *tsd);
  void arenas_tdata_cleanup(tsd_t *tsd);
  void jemalloc_prefork(void);
  void jemalloc_postfork_parent(void);
  void jemalloc_postfork_child(void);
  bool malloc_initialized(void);
  void je_sdallocx_noflags(void *ptr, size_t size);
  
  #endif /* JEMALLOC_INTERNAL_EXTERNS_H */
  