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| author | Ondřej Bílka <neleai@seznam.cz> | 2013-10-30 16:24:38 +0100 |
|---|---|---|
| committer | Ondřej Bílka <neleai@seznam.cz> | 2013-10-30 16:25:21 +0100 |
| commit | c6e4925d4069d38843c02994ffd284e8c87c8929 (patch) | |
| tree | 5558a3ae83abb2b52818add3185bea2127cd7a39 /malloc/malloc.c | |
| parent | bbea82f7fe8af40fd08e8956e1aaf4d877168652 (diff) | |
| download | glibc-c6e4925d4069d38843c02994ffd284e8c87c8929.tar.gz glibc-c6e4925d4069d38843c02994ffd284e8c87c8929.tar.xz glibc-c6e4925d4069d38843c02994ffd284e8c87c8929.zip | |
Use atomic operations to track memory. Fixes bug 11087
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index 1a18c3f5f2..79025b16d9 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -2253,7 +2253,6 @@ static void* sysmalloc(INTERNAL_SIZE_T nb, mstate av) mchunkptr remainder; /* remainder from allocation */ unsigned long remainder_size; /* its size */ - unsigned long sum; /* for updating stats */ size_t pagemask = GLRO(dl_pagesize) - 1; bool tried_mmap = false; @@ -2325,12 +2324,12 @@ static void* sysmalloc(INTERNAL_SIZE_T nb, mstate av) /* update statistics */ - if (++mp_.n_mmaps > mp_.max_n_mmaps) - mp_.max_n_mmaps = mp_.n_mmaps; + int new = atomic_exchange_and_add (&mp_.n_mmaps, 1) + 1; + atomic_max (&mp_.max_n_mmaps, new); - sum = mp_.mmapped_mem += size; - if (sum > (unsigned long)(mp_.max_mmapped_mem)) - mp_.max_mmapped_mem = sum; + unsigned long sum; + sum = atomic_exchange_and_add(&mp_.mmapped_mem, size) + size; + atomic_max (&mp_.max_mmapped_mem, sum); check_chunk(av, p); @@ -2780,8 +2779,8 @@ munmap_chunk(mchunkptr p) return; } - mp_.n_mmaps--; - mp_.mmapped_mem -= total_size; + atomic_decrement (&mp_.n_mmaps); + atomic_add (&mp_.mmapped_mem, -total_size); /* If munmap failed the process virtual memory address space is in a bad shape. Just leave the block hanging around, the process will @@ -2822,10 +2821,10 @@ mremap_chunk(mchunkptr p, size_t new_size) assert((p->prev_size == offset)); set_head(p, (new_size - offset)|IS_MMAPPED); - mp_.mmapped_mem -= size + offset; - mp_.mmapped_mem += new_size; - if ((unsigned long)mp_.mmapped_mem > (unsigned long)mp_.max_mmapped_mem) - mp_.max_mmapped_mem = mp_.mmapped_mem; + INTERNAL_SIZE_T new; + new = atomic_exchange_and_add (&mp_.mmapped_mem, new_size - size - offset) + + new_size - size - offset; + atomic_max (&mp_.max_mmapped_mem, new); return p; } |