Fix chunk cache races.

These regressions were introduced by
ee41ad409a (Integrate whole chunks into
unused dirty page purging machinery.).

include/jemalloc/internal/arena.h

@@ -399,6 +399,7 @@ void	arena_chunk_ralloc_huge_shrink(arena_t *arena, void *chunk,
     size_t oldsize, size_t usize);
 bool	arena_chunk_ralloc_huge_expand(arena_t *arena, void *chunk,
     size_t oldsize, size_t usize, bool *zero);
+void	arena_maybe_purge(arena_t *arena);
 void	arena_purge_all(arena_t *arena);
 void	arena_tcache_fill_small(arena_t *arena, tcache_bin_t *tbin,
     index_t binind, uint64_t prof_accumbytes);

include/jemalloc/internal/chunk.h

@@ -39,16 +39,21 @@ extern size_t		chunk_npages;
 bool	chunk_register(const void *chunk, const extent_node_t *node);
 void	chunk_deregister(const void *chunk, const extent_node_t *node);
 void	*chunk_alloc_base(size_t size);
-void	*chunk_alloc_arena(chunk_alloc_t *chunk_alloc,
-    chunk_dalloc_t *chunk_dalloc, unsigned arena_ind, void *new_addr,
-    size_t size, size_t alignment, bool *zero);
+void	*chunk_alloc_cache(arena_t *arena, void *new_addr, size_t size,
+    size_t alignment, bool *zero, bool dalloc_node);
 void	*chunk_alloc_default(void *new_addr, size_t size, size_t alignment,
     bool *zero, unsigned arena_ind);
+void	*chunk_alloc_wrapper(arena_t *arena, chunk_alloc_t *chunk_alloc,
+    void *new_addr, size_t size, size_t alignment, bool *zero);
 void	chunk_record(arena_t *arena, extent_tree_t *chunks_szad,
     extent_tree_t *chunks_ad, bool cache, void *chunk, size_t size,
     bool zeroed);
+void	chunk_dalloc_cache(arena_t *arena, void *chunk, size_t size);
+void	chunk_dalloc_arena(arena_t *arena, void *chunk, size_t size,
+    bool zeroed);
 bool	chunk_dalloc_default(void *chunk, size_t size, unsigned arena_ind);
-void	chunk_unmap(arena_t *arena, void *chunk, size_t size, bool zeroed);
+void	chunk_dalloc_wrapper(arena_t *arena, chunk_dalloc_t *chunk_dalloc,
+    void *chunk, size_t size);
 bool	chunk_boot(void);
 void	chunk_prefork(void);
 void	chunk_postfork_parent(void);

include/jemalloc/internal/private_symbols.txt

@@ -53,6 +53,7 @@ arena_mapbitsp_read
 arena_mapbitsp_write
 arena_maxclass
 arena_maxrun
+arena_maybe_purge
 arena_metadata_allocated_add
 arena_metadata_allocated_get
 arena_metadata_allocated_sub
@@ -124,14 +125,18 @@ bootstrap_free
 bootstrap_malloc
 bt_init
 buferror
-chunk_alloc_arena
+chunk_alloc_cache
 chunk_alloc_base
 chunk_alloc_default
 chunk_alloc_dss
 chunk_alloc_mmap
+chunk_alloc_wrapper
 chunk_boot
+chunk_dalloc_arena
+chunk_dalloc_cache
 chunk_dalloc_default
 chunk_dalloc_mmap
+chunk_dalloc_wrapper
 chunk_deregister
 chunk_dss_boot
 chunk_dss_postfork_child
@@ -147,7 +152,6 @@ chunk_postfork_parent
 chunk_prefork
 chunk_record
 chunk_register
-chunk_unmap
 chunks_rtree
 chunksize
 chunksize_mask