/* Malloc implementation for multiple threads without lock contention. Copyright (C) 2001-2020 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Wolfram Gloger , 2001. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; see the file COPYING.LIB. If not, see . */ #include #if HAVE_TUNABLES # define TUNABLE_NAMESPACE malloc #endif #include /* Compile-time constants. */ #define HEAP_MIN_SIZE (32 * 1024) #ifndef HEAP_MAX_SIZE # ifdef DEFAULT_MMAP_THRESHOLD_MAX # define HEAP_MAX_SIZE (2 * DEFAULT_MMAP_THRESHOLD_MAX) # else # define HEAP_MAX_SIZE (1024 * 1024) /* must be a power of two */ # endif #endif /* HEAP_MIN_SIZE and HEAP_MAX_SIZE limit the size of mmap()ed heaps that are dynamically created for multi-threaded programs. The maximum size must be a power of two, for fast determination of which heap belongs to a chunk. It should be much larger than the mmap threshold, so that requests with a size just below that threshold can be fulfilled without creating too many heaps. */ /***************************************************************************/ #define top(ar_ptr) ((ar_ptr)->top) /* A heap is a single contiguous memory region holding (coalesceable) malloc_chunks. It is allocated with mmap() and always starts at an address aligned to HEAP_MAX_SIZE. */ typedef struct _heap_info { mstate ar_ptr; /* Arena for this heap. */ struct _heap_info *prev; /* Previous heap. */ size_t size; /* Current size in bytes. */ size_t mprotect_size; /* Size in bytes that has been mprotected PROT_READ|PROT_WRITE. */ /* Make sure the following data is properly aligned, particularly that sizeof (heap_info) + 2 * SIZE_SZ is a multiple of MALLOC_ALIGNMENT. */ char pad[-6 * SIZE_SZ & MALLOC_ALIGN_MASK]; } heap_info; /* Get a compile-time error if the heap_info padding is not correct to make alignment work as expected in sYSMALLOc. */ extern int sanity_check_heap_info_alignment[(sizeof (heap_info) + 2 * SIZE_SZ) % MALLOC_ALIGNMENT ? -1 : 1]; /* Thread specific data. */ static __thread mstate thread_arena attribute_tls_model_ie; /* Arena free list. free_list_lock synchronizes access to the free_list variable below, and the next_free and attached_threads members of struct malloc_state objects. No other locks must be acquired after free_list_lock has been acquired. */ __libc_lock_define_initialized (static, free_list_lock); static size_t narenas = 1; static mstate free_list; /* list_lock prevents concurrent writes to the next member of struct malloc_state objects. Read access to the next member is supposed to synchronize with the atomic_write_barrier and the write to the next member in _int_new_arena. This suffers from data races; see the FIXME comments in _int_new_arena and reused_arena. list_lock also prevents concurrent forks. At the time list_lock is acquired, no arena lock must have been acquired, but it is permitted to acquire arena locks subsequently, while list_lock is acquired. */ __libc_lock_define_initialized (static, list_lock); /* Already initialized? */ int __malloc_initialized = -1; /**************************************************************************/ /* arena_get() acquires an arena and locks the corresponding mutex. First, try the one last locked successfully by this thread. (This is the common case and handled with a macro for speed.) Then, loop once over the circularly linked list of arenas. If no arena is readily available, create a new one. In this latter case, `size' is just a hint as to how much memory will be required immediately in the new arena. */ #define arena_get(ptr, size) do { \ ptr = thread_arena; \ arena_lock (ptr, size); \ } while (0) #define arena_lock(ptr, size) do { \ if (ptr) \ __libc_lock_lock (ptr->mutex); \ else \ ptr = arena_get2 ((size), NULL); \ } while (0) /* find the heap and corresponding arena for a given ptr */ #define heap_for_ptr(ptr) \ ((heap_info *) ((unsigned long) (ptr) & ~(HEAP_MAX_SIZE - 1))) #define arena_for_chunk(ptr) \ (chunk_main_arena (ptr) ? &main_arena : heap_for_ptr (ptr)->ar_ptr) /**************************************************************************/ /* atfork support. */ /* The following three functions are called around fork from a multi-threaded process. We do not use the general fork handler mechanism to make sure that our handlers are the last ones being called, so that other fork handlers can use the malloc subsystem. */ void __malloc_fork_lock_parent (void) { if (__malloc_initialized < 1) return; /* We do not acquire free_list_lock here because we completely reconstruct free_list in __malloc_fork_unlock_child. */ __libc_lock_lock (list_lock); for (mstate ar_ptr = &main_arena;; ) { __libc_lock_lock (ar_ptr->mutex); ar_ptr = ar_ptr->next; if (ar_ptr == &main_arena) break; } } void __malloc_fork_unlock_parent (void) { if (__malloc_initialized < 1) return; for (mstate ar_ptr = &main_arena;; ) { __libc_lock_unlock (ar_ptr->mutex); ar_ptr = ar_ptr->next; if (ar_ptr == &main_arena) break; } __libc_lock_unlock (list_lock); } void __malloc_fork_unlock_child (void) { if (__malloc_initialized < 1) return; /* Push all arenas to the free list, except thread_arena, which is attached to the current thread. */ __libc_lock_init (free_list_lock); if (thread_arena != NULL) thread_arena->attached_threads = 1; free_list = NULL; for (mstate ar_ptr = &main_arena;; ) { __libc_lock_init (ar_ptr->mutex); if (ar_ptr != thread_arena) { /* This arena is no longer attached to any thread. */ ar_ptr->attached_threads = 0; ar_ptr->next_free = free_list; free_list = ar_ptr; } ar_ptr = ar_ptr->next; if (ar_ptr == &main_arena) break; } __libc_lock_init (list_lock); } #if HAVE_TUNABLES void TUNABLE_CALLBACK (set_mallopt_check) (tunable_val_t *valp) { int32_t value = (int32_t) valp->numval; if (value != 0) __malloc_check_init (); } # define TUNABLE_CALLBACK_FNDECL(__name, __type) \ static inline int do_ ## __name (__type value); \ void \ TUNABLE_CALLBACK (__name) (tunable_val_t *valp) \ { \ __type value = (__type) (valp)->numval; \ do_ ## __name (value); \ } TUNABLE_CALLBACK_FNDECL (set_mmap_threshold, size_t) TUNABLE_CALLBACK_FNDECL (set_mmaps_max, int32_t) TUNABLE_CALLBACK_FNDECL (set_top_pad, size_t) TUNABLE_CALLBACK_FNDECL (set_perturb_byte, int32_t) TUNABLE_CALLBACK_FNDECL (set_trim_threshold, size_t) TUNABLE_CALLBACK_FNDECL (set_arena_max, size_t) TUNABLE_CALLBACK_FNDECL (set_arena_test, size_t) #if USE_TCACHE TUNABLE_CALLBACK_FNDECL (set_tcache_max, size_t) TUNABLE_CALLBACK_FNDECL (set_tcache_count, size_t) TUNABLE_CALLBACK_FNDECL (set_tcache_unsorted_limit, size_t) #endif TUNABLE_CALLBACK_FNDECL (set_mxfast, size_t) #else /* Initialization routine. */ #include extern char **_environ; static char * next_env_entry (char ***position) { char **current = *position; char *result = NULL; while (*current != NULL) { if (__builtin_expect ((*current)[0] == 'M', 0) && (*current)[1] == 'A' && (*current)[2] == 'L' && (*current)[3] == 'L' && (*current)[4] == 'O' && (*current)[5] == 'C' && (*current)[6] == '_') { result = &(*current)[7]; /* Save current position for next visit. */ *position = ++current; break; } ++current; } return result; } #endif #if defined(SHARED) || defined(_LIBC_MTAG) static void * __failing_morecore (ptrdiff_t d) { return (void *) MORECORE_FAILURE; } #endif #ifdef SHARED extern struct dl_open_hook *_dl_open_hook; libc_hidden_proto (_dl_open_hook); #endif #ifdef _LIBC_MTAG /* Generate a new (random) tag value for PTR and tag the memory it points to upto the end of the usable size for the chunk containing it. Return the newly tagged pointer. */ static void * __mtag_tag_new_usable (void *ptr) { if (ptr) { mchunkptr cp = mem2chunk(ptr); /* This likely will never happen, but we can't handle retagging chunks from the dumped main arena. So just return the existing pointer. */ if (DUMPED_MAIN_ARENA_CHUNK (cp)) return ptr; ptr = __libc_mtag_tag_region (__libc_mtag_new_tag (ptr), CHUNK_AVAILABLE_SIZE (cp) - CHUNK_HDR_SZ); } return ptr; } /* Generate a new (random) tag value for PTR, set the tags for the memory to the new tag and initialize the memory contents to VAL. In practice this function will only be called with VAL=0, but we keep this parameter to maintain the same prototype as memset. */ static void * __mtag_tag_new_memset (void *ptr, int val, size_t size) { return __libc_mtag_memset_with_tag (__libc_mtag_new_tag (ptr), val, size); } #endif static void ptmalloc_init (void) { if (__malloc_initialized >= 0) return; __malloc_initialized = 0; #ifdef _LIBC_MTAG if ((TUNABLE_GET_FULL (glibc, memtag, enable, int32_t, NULL) & 1) != 0) { /* If the environment says that we should be using tagged memory and that morecore does not support tagged regions, then disable it. */ if (__MTAG_SBRK_UNTAGGED) __morecore = __failing_morecore; __mtag_mmap_flags = __MTAG_MMAP_FLAGS; __tag_new_memset = __mtag_tag_new_memset; __tag_region = __libc_mtag_tag_region; __tag_new_usable = __mtag_tag_new_usable; __tag_at = __libc_mtag_address_get_tag; __mtag_granule_mask = ~(size_t)(__MTAG_GRANULE_SIZE - 1); } #endif #ifdef SHARED /* In case this libc copy is in a non-default namespace, never use brk. Likewise if dlopened from statically linked program. */ Dl_info di; struct link_map *l; if (_dl_open_hook != NULL || (_dl_addr (ptmalloc_init, &di, &l, NULL) != 0 && l->l_ns != LM_ID_BASE)) __morecore = __failing_morecore; #endif thread_arena = &main_arena; malloc_init_state (&main_arena); #if HAVE_TUNABLES TUNABLE_GET (check, int32_t, TUNABLE_CALLBACK (set_mallopt_check)); TUNABLE_GET (top_pad, size_t, TUNABLE_CALLBACK (set_top_pad)); TUNABLE_GET (perturb, int32_t, TUNABLE_CALLBACK (set_perturb_byte)); TUNABLE_GET (mmap_threshold, size_t, TUNABLE_CALLBACK (set_mmap_threshold)); TUNABLE_GET (trim_threshold, size_t, TUNABLE_CALLBACK (set_trim_threshold)); TUNABLE_GET (mmap_max, int32_t, TUNABLE_CALLBACK (set_mmaps_max)); TUNABLE_GET (arena_max, size_t, TUNABLE_CALLBACK (set_arena_max)); TUNABLE_GET (arena_test, size_t, TUNABLE_CALLBACK (set_arena_test)); # if USE_TCACHE TUNABLE_GET (tcache_max, size_t, TUNABLE_CALLBACK (set_tcache_max)); TUNABLE_GET (tcache_count, size_t, TUNABLE_CALLBACK (set_tcache_count)); TUNABLE_GET (tcache_unsorted_limit, size_t, TUNABLE_CALLBACK (set_tcache_unsorted_limit)); # endif TUNABLE_GET (mxfast, size_t, TUNABLE_CALLBACK (set_mxfast)); #else const char *s = NULL; if (__glibc_likely (_environ != NULL)) { char **runp = _environ; char *envline; while (__builtin_expect ((envline = next_env_entry (&runp)) != NULL, 0)) { size_t len = strcspn (envline, "="); if (envline[len] != '=') /* This is a "MALLOC_" variable at the end of the string without a '=' character. Ignore it since otherwise we will access invalid memory below. */ continue; switch (len) { case 6: if (memcmp (envline, "CHECK_", 6) == 0) s = &envline[7]; break; case 8: if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "TOP_PAD_", 8) == 0) __libc_mallopt (M_TOP_PAD, atoi (&envline[9])); else if (memcmp (envline, "PERTURB_", 8) == 0) __libc_mallopt (M_PERTURB, atoi (&envline[9])); } break; case 9: if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "MMAP_MAX_", 9) == 0) __libc_mallopt (M_MMAP_MAX, atoi (&envline[10])); else if (memcmp (envline, "ARENA_MAX", 9) == 0) __libc_mallopt (M_ARENA_MAX, atoi (&envline[10])); } break; case 10: if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "ARENA_TEST", 10) == 0) __libc_mallopt (M_ARENA_TEST, atoi (&envline[11])); } break; case 15: if (!__builtin_expect (__libc_enable_secure, 0)) { if (memcmp (envline, "TRIM_THRESHOLD_", 15) == 0) __libc_mallopt (M_TRIM_THRESHOLD, atoi (&envline[16])); else if (memcmp (envline, "MMAP_THRESHOLD_", 15) == 0) __libc_mallopt (M_MMAP_THRESHOLD, atoi (&envline[16])); } break; default: break; } } } if (s && s[0] != '\0' && s[0] != '0') __malloc_check_init (); #endif #if HAVE_MALLOC_INIT_HOOK void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook); if (hook != NULL) (*hook)(); #endif __malloc_initialized = 1; } /* Managing heaps and arenas (for concurrent threads) */ #if MALLOC_DEBUG > 1 /* Print the complete contents of a single heap to stderr. */ static void dump_heap (heap_info *heap) { char *ptr; mchunkptr p; fprintf (stderr, "Heap %p, size %10lx:\n", heap, (long) heap->size); ptr = (heap->ar_ptr != (mstate) (heap + 1)) ? (char *) (heap + 1) : (char *) (heap + 1) + sizeof (struct malloc_state); p = (mchunkptr) (((unsigned long) ptr + MALLOC_ALIGN_MASK) & ~MALLOC_ALIGN_MASK); for (;; ) { fprintf (stderr, "chunk %p size %10lx", p, (long) chunksize_nomask(p)); if (p == top (heap->ar_ptr)) { fprintf (stderr, " (top)\n"); break; } else if (chunksize_nomask(p) == (0 | PREV_INUSE)) { fprintf (stderr, " (fence)\n"); break; } fprintf (stderr, "\n"); p = next_chunk (p); } } #endif /* MALLOC_DEBUG > 1 */ /* If consecutive mmap (0, HEAP_MAX_SIZE << 1, ...) calls return decreasing addresses as opposed to increasing, new_heap would badly fragment the address space. In that case remember the second HEAP_MAX_SIZE part aligned to HEAP_MAX_SIZE from last mmap (0, HEAP_MAX_SIZE << 1, ...) call (if it is already aligned) and try to reuse it next time. We need no locking for it, as kernel ensures the atomicity for us - worst case we'll call mmap (addr, HEAP_MAX_SIZE, ...) for some value of addr in multiple threads, but only one will succeed. */ static char *aligned_heap_area; /* Create a new heap. size is automatically rounded up to a multiple of the page size. */ static heap_info * new_heap (size_t size, size_t top_pad) { size_t pagesize = GLRO (dl_pagesize); char *p1, *p2; unsigned long ul; heap_info *h; if (size + top_pad < HEAP_MIN_SIZE) size = HEAP_MIN_SIZE; else if (size + top_pad <= HEAP_MAX_SIZE) size += top_pad; else if (size > HEAP_MAX_SIZE) return 0; else size = HEAP_MAX_SIZE; size = ALIGN_UP (size, pagesize); /* A memory region aligned to a multiple of HEAP_MAX_SIZE is needed. No swap space needs to be reserved for the following large mapping (on Linux, this is the case for all non-writable mappings anyway). */ p2 = MAP_FAILED; if (aligned_heap_area) { p2 = (char *) MMAP (aligned_heap_area, HEAP_MAX_SIZE, PROT_NONE, MAP_NORESERVE); aligned_heap_area = NULL; if (p2 != MAP_FAILED && ((unsigned long) p2 & (HEAP_MAX_SIZE - 1))) { __munmap (p2, HEAP_MAX_SIZE); p2 = MAP_FAILED; } } if (p2 == MAP_FAILED) { p1 = (char *) MMAP (0, HEAP_MAX_SIZE << 1, PROT_NONE, MAP_NORESERVE); if (p1 != MAP_FAILED) { p2 = (char *) (((unsigned long) p1 + (HEAP_MAX_SIZE - 1)) & ~(HEAP_MAX_SIZE - 1)); ul = p2 - p1; if (ul) __munmap (p1, ul); else aligned_heap_area = p2 + HEAP_MAX_SIZE; __munmap (p2 + HEAP_MAX_SIZE, HEAP_MAX_SIZE - ul); } else { /* Try to take the chance that an allocation of only HEAP_MAX_SIZE is already aligned. */ p2 = (char *) MMAP (0, HEAP_MAX_SIZE, PROT_NONE, MAP_NORESERVE); if (p2 == MAP_FAILED) return 0; if ((unsigned long) p2 & (HEAP_MAX_SIZE - 1)) { __munmap (p2, HEAP_MAX_SIZE); return 0; } } } if (__mprotect (p2, size, MTAG_MMAP_FLAGS | PROT_READ | PROT_WRITE) != 0) { __munmap (p2, HEAP_MAX_SIZE); return 0; } h = (heap_info *) p2; h->size = size; h->mprotect_size = size; LIBC_PROBE (memory_heap_new, 2, h, h->size); return h; } /* Grow a heap. size is automatically rounded up to a multiple of the page size. */ static int grow_heap (heap_info *h, long diff) { size_t pagesize = GLRO (dl_pagesize); long new_size; diff = ALIGN_UP (diff, pagesize); new_size = (long) h->size + diff; if ((unsigned long) new_size > (unsigned long) HEAP_MAX_SIZE) return -1; if ((unsigned long) new_size > h->mprotect_size) { if (__mprotect ((char *) h + h->mprotect_size, (unsigned long) new_size - h->mprotect_size, MTAG_MMAP_FLAGS | PROT_READ | PROT_WRITE) != 0) return -2; h->mprotect_size = new_size; } h->size = new_size; LIBC_PROBE (memory_heap_more, 2, h, h->size); return 0; } /* Shrink a heap. */ static int shrink_heap (heap_info *h, long diff) { long new_size; new_size = (long) h->size - diff; if (new_size < (long) sizeof (*h)) return -1; /* Try to re-map the extra heap space freshly to save memory, and make it inaccessible. See malloc-sysdep.h to know when this is true. */ if (__glibc_unlikely (check_may_shrink_heap ())) { if ((char *) MMAP ((char *) h + new_size, diff, PROT_NONE, MAP_FIXED) == (char *) MAP_FAILED) return -2; h->mprotect_size = new_size; } else __madvise ((char *) h + new_size, diff, MADV_DONTNEED); /*fprintf(stderr, "shrink %p %08lx\n", h, new_size);*/ h->size = new_size; LIBC_PROBE (memory_heap_less, 2, h, h->size); return 0; } /* Delete a heap. */ #define delete_heap(heap) \ do { \ if ((char *) (heap) + HEAP_MAX_SIZE == aligned_heap_area) \ aligned_heap_area = NULL; \ __munmap ((char *) (heap), HEAP_MAX_SIZE); \ } while (0) static int heap_trim (heap_info *heap, size_t pad) { mstate ar_ptr = heap->ar_ptr; unsigned long pagesz = GLRO (dl_pagesize); mchunkptr top_chunk = top (ar_ptr), p; heap_info *prev_heap; long new_size, top_size, top_area, extra, prev_size, misalign; /* Can this heap go away completely? */ while (top_chunk == chunk_at_offset (heap, sizeof (*heap))) { prev_heap = heap->prev; prev_size = prev_heap->size - (MINSIZE - 2 * SIZE_SZ); p = chunk_at_offset (prev_heap, prev_size); /* fencepost must be properly aligned. */ misalign = ((long) p) & MALLOC_ALIGN_MASK; p = chunk_at_offset (prev_heap, prev_size - misalign); assert (chunksize_nomask (p) == (0 | PREV_INUSE)); /* must be fencepost */ p = prev_chunk (p); new_size = chunksize (p) + (MINSIZE - 2 * SIZE_SZ) + misalign; assert (new_size > 0 && new_size < (long) (2 * MINSIZE)); if (!prev_inuse (p)) new_size += prev_size (p); assert (new_size > 0 && new_size < HEAP_MAX_SIZE); if (new_size + (HEAP_MAX_SIZE - prev_heap->size) < pad + MINSIZE + pagesz) break; ar_ptr->system_mem -= heap->size; LIBC_PROBE (memory_heap_free, 2, heap, heap->size); delete_heap (heap); heap = prev_heap; if (!prev_inuse (p)) /* consolidate backward */ { p = prev_chunk (p); unlink_chunk (ar_ptr, p); } assert (((unsigned long) ((char *) p + new_size) & (pagesz - 1)) == 0); assert (((char *) p + new_size) == ((char *) heap + heap->size)); top (ar_ptr) = top_chunk = p; set_head (top_chunk, new_size | PREV_INUSE); /*check_chunk(ar_ptr, top_chunk);*/ } /* Uses similar logic for per-thread arenas as the main arena with systrim and _int_free by preserving the top pad and rounding down to the nearest page. */ top_size = chunksize (top_chunk); if ((unsigned long)(top_size) < (unsigned long)(mp_.trim_threshold)) return 0; top_area = top_size - MINSIZE - 1; if (top_area < 0 || (size_t) top_area <= pad) return 0; /* Release in pagesize units and round down to the nearest page. */ extra = ALIGN_DOWN(top_area - pad, pagesz); if (extra == 0) return 0; /* Try to shrink. */ if (shrink_heap (heap, extra) != 0) return 0; ar_ptr->system_mem -= extra; /* Success. Adjust top accordingly. */ set_head (top_chunk, (top_size - extra) | PREV_INUSE); /*check_chunk(ar_ptr, top_chunk);*/ return 1; } /* Create a new arena with initial size "size". */ /* If REPLACED_ARENA is not NULL, detach it from this thread. Must be called while free_list_lock is held. */ static void detach_arena (mstate replaced_arena) { if (replaced_arena != NULL) { assert (replaced_arena->attached_threads > 0); /* The current implementation only detaches from main_arena in case of allocation failure. This means that it is likely not beneficial to put the arena on free_list even if the reference count reaches zero. */ --replaced_arena->attached_threads; } } static mstate _int_new_arena (size_t size) { mstate a; heap_info *h; char *ptr; unsigned long misalign; h = new_heap (size + (sizeof (*h) + sizeof (*a) + MALLOC_ALIGNMENT), mp_.top_pad); if (!h) { /* Maybe size is too large to fit in a single heap. So, just try to create a minimally-sized arena and let _int_malloc() attempt to deal with the large request via mmap_chunk(). */ h = new_heap (sizeof (*h) + sizeof (*a) + MALLOC_ALIGNMENT, mp_.top_pad); if (!h) return 0; } a = h->ar_ptr = (mstate) (h + 1); malloc_init_state (a); a->attached_threads = 1; /*a->next = NULL;*/ a->system_mem = a->max_system_mem = h->size; /* Set up the top chunk, with proper alignment. */ ptr = (char *) (a + 1); misalign = (unsigned long) chunk2mem (ptr) & MALLOC_ALIGN_MASK; if (misalign > 0) ptr += MALLOC_ALIGNMENT - misalign; top (a) = (mchunkptr) ptr; set_head (top (a), (((char *) h + h->size) - ptr) | PREV_INUSE); LIBC_PROBE (memory_arena_new, 2, a, size); mstate replaced_arena = thread_arena; thread_arena = a; __libc_lock_init (a->mutex); __libc_lock_lock (list_lock); /* Add the new arena to the global list. */ a->next = main_arena.next; /* FIXME: The barrier is an attempt to synchronize with read access in reused_arena, which does not acquire list_lock while traversing the list. */ atomic_write_barrier (); main_arena.next = a; __libc_lock_unlock (list_lock); __libc_lock_lock (free_list_lock); detach_arena (replaced_arena); __libc_lock_unlock (free_list_lock); /* Lock this arena. NB: Another thread may have been attached to this arena because the arena is now accessible from the main_arena.next list and could have been picked by reused_arena. This can only happen for the last arena created (before the arena limit is reached). At this point, some arena has to be attached to two threads. We could acquire the arena lock before list_lock to make it less likely that reused_arena picks this new arena, but this could result in a deadlock with __malloc_fork_lock_parent. */ __libc_lock_lock (a->mutex); return a; } /* Remove an arena from free_list. */ static mstate get_free_list (void) { mstate replaced_arena = thread_arena; mstate result = free_list; if (result != NULL) { __libc_lock_lock (free_list_lock); result = free_list; if (result != NULL) { free_list = result->next_free; /* The arena will be attached to this thread. */ assert (result->attached_threads == 0); result->attached_threads = 1; detach_arena (replaced_arena); } __libc_lock_unlock (free_list_lock); if (result != NULL) { LIBC_PROBE (memory_arena_reuse_free_list, 1, result); __libc_lock_lock (result->mutex); thread_arena = result; } } return result; } /* Remove the arena from the free list (if it is present). free_list_lock must have been acquired by the caller. */ static void remove_from_free_list (mstate arena) { mstate *previous = &free_list; for (mstate p = free_list; p != NULL; p = p->next_free) { assert (p->attached_threads == 0); if (p == arena) { /* Remove the requested arena from the list. */ *previous = p->next_free; break; } else previous = &p->next_free; } } /* Lock and return an arena that can be reused for memory allocation. Avoid AVOID_ARENA as we have already failed to allocate memory in it and it is currently locked. */ static mstate reused_arena (mstate avoid_arena) { mstate result; /* FIXME: Access to next_to_use suffers from data races. */ static mstate next_to_use; if (next_to_use == NULL) next_to_use = &main_arena; /* Iterate over all arenas (including those linked from free_list). */ result = next_to_use; do { if (!__libc_lock_trylock (result->mutex)) goto out; /* FIXME: This is a data race, see _int_new_arena. */ result = result->next; } while (result != next_to_use); /* Avoid AVOID_ARENA as we have already failed to allocate memory in that arena and it is currently locked. */ if (result == avoid_arena) result = result->next; /* No arena available without contention. Wait for the next in line. */ LIBC_PROBE (memory_arena_reuse_wait, 3, &result->mutex, result, avoid_arena); __libc_lock_lock (result->mutex); out: /* Attach the arena to the current thread. */ { /* Update the arena thread attachment counters. */ mstate replaced_arena = thread_arena; __libc_lock_lock (free_list_lock); detach_arena (replaced_arena); /* We may have picked up an arena on the free list. We need to preserve the invariant that no arena on the free list has a positive attached_threads counter (otherwise, arena_thread_freeres cannot use the counter to determine if the arena needs to be put on the free list). We unconditionally remove the selected arena from the free list. The caller of reused_arena checked the free list and observed it to be empty, so the list is very short. */ remove_from_free_list (result); ++result->attached_threads; __libc_lock_unlock (free_list_lock); } LIBC_PROBE (memory_arena_reuse, 2, result, avoid_arena); thread_arena = result; next_to_use = result->next; return result; } static mstate arena_get2 (size_t size, mstate avoid_arena) { mstate a; static size_t narenas_limit; a = get_free_list (); if (a == NULL) { /* Nothing immediately available, so generate a new arena. */ if (narenas_limit == 0) { if (mp_.arena_max != 0) narenas_limit = mp_.arena_max; else if (narenas > mp_.arena_test) { int n = __get_nprocs (); if (n >= 1) narenas_limit = NARENAS_FROM_NCORES (n); else /* We have no information about the system. Assume two cores. */ narenas_limit = NARENAS_FROM_NCORES (2); } } repeat:; size_t n = narenas; /* NB: the following depends on the fact that (size_t)0 - 1 is a very large number and that the underflow is OK. If arena_max is set the value of arena_test is irrelevant. If arena_test is set but narenas is not yet larger or equal to arena_test narenas_limit is 0. There is no possibility for narenas to be too big for the test to always fail since there is not enough address space to create that many arenas. */ if (__glibc_unlikely (n <= narenas_limit - 1)) { if (catomic_compare_and_exchange_bool_acq (&narenas, n + 1, n)) goto repeat; a = _int_new_arena (size); if (__glibc_unlikely (a == NULL)) catomic_decrement (&narenas); } else a = reused_arena (avoid_arena); } return a; } /* If we don't have the main arena, then maybe the failure is due to running out of mmapped areas, so we can try allocating on the main arena. Otherwise, it is likely that sbrk() has failed and there is still a chance to mmap(), so try one of the other arenas. */ static mstate arena_get_retry (mstate ar_ptr, size_t bytes) { LIBC_PROBE (memory_arena_retry, 2, bytes, ar_ptr); if (ar_ptr != &main_arena) { __libc_lock_unlock (ar_ptr->mutex); ar_ptr = &main_arena; __libc_lock_lock (ar_ptr->mutex); } else { __libc_lock_unlock (ar_ptr->mutex); ar_ptr = arena_get2 (bytes, ar_ptr); } return ar_ptr; } void __malloc_arena_thread_freeres (void) { /* Shut down the thread cache first. This could deallocate data for the thread arena, so do this before we put the arena on the free list. */ tcache_thread_shutdown (); mstate a = thread_arena; thread_arena = NULL; if (a != NULL) { __libc_lock_lock (free_list_lock); /* If this was the last attached thread for this arena, put the arena on the free list. */ assert (a->attached_threads > 0); if (--a->attached_threads == 0) { a->next_free = free_list; free_list = a; } __libc_lock_unlock (free_list_lock); } } /* * Local variables: * c-basic-offset: 2 * End: */