libffi/src/dlmalloc.c

140   broken in approximately least-recently-used order. (This strategy
144   to that used for the previous small request, as well as by breaking
145   ties in approximately most-recently-used order. (These enhance
149   possibly fragmenting memory used only for large chunks.)
320   HAVE_MORECORE is not true, MMAP is used for all system
322   primarily used to directly allocate very large blocks. It is also
323   used as a backup strategy in cases where MORECORE fails to provide
336 USE_BUILTIN_FFS            default: 0 (i.e., not used)
351 USE_DEV_RANDOM             default: 0 (i.e., not used)
353   stamping footers. Otherwise, the current time is used.
363   size_t. The value is used only if  HAVE_USR_INCLUDE_MALLOC_H is not set
420   normal freed space already exists it is used instead.)  Using mmap
432   cannot be reclaimed, consolidated, and then used to service later
586   are used in this malloc, so setting them has no effect. But this
724   to be used as an argument to realloc is not supported.
735   not a power of two, the nearest greater power is used.
746   size of the system. If the pagesize is unknown, 4096 is used.
906   independent_comalloc can be used to speed up allocation in cases
952   memory will be locked between two used chunks, so they cannot be
1030   used by the space become undefined.
1037   space is used for bookkeeping, so the capacity must be at least this
1604   size, and can be used to find the front of the previous chunk.
1633         specially.  Top is never included in any bin, is used only if
1647         also used to hold the offset this chunk has within its mmapped
1657   struct malloc_chunk* fd;         /* double links -- used only if free. */
1823   the oldest chunk (the next to be used, in our FIFO ordering)
1893   used preferentially to MMAP when both are available -- see
1903   used for chunks to reduce fragmentation -- new adjacent memory is
2025     clears the bit when empty.  Bit operations are then used to avoid
2029     For a good description of some of the bit-based techniques used
2111 /* The global malloc_state used for all non-"mspace" calls */
2409   verify footer fields of inuse chunks, which can be used guarantee
2557  /* if low-memory is used, os2munmap() would break
2926     size_t used = 0;
2932       used = fp - (m->topsize + TOP_FOOT_SIZE);
2939             used -= chunksize(q);
2948     fprintf(stderr, "in use bytes     = %10lu\n", (unsigned long)(used));
3444        used as a noncontiguous system allocator. This is a useful backup
3614 /* Unmap and unlink any mmapped segments that don't contain used chunks */
4131           chunk adjacent to the one used for the most recent small request.
5018       * Remove some options that no one ever used and rename others.
5134       * Try not to scavenge used bins