Handle mmap failures for redblack tree cache

The redblack tree cache is totally optional, so if we can't allocate
room for the cache, then just pretend as if the cache is full if mmap
fails
This commit is contained in:
Aaron Patterson 2024-01-11 16:05:21 -08:00 committed by Aaron Patterson
parent 2d9db72d37
commit 8b8dcc7af1

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@ -1233,6 +1233,14 @@ Init_default_shapes(void)
rb_shape_tree_ptr->shape_cache = (redblack_node_t *)mmap(NULL, rb_size_mul_or_raise(REDBLACK_CACHE_SIZE, sizeof(redblack_node_t), rb_eRuntimeError),
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
rb_shape_tree_ptr->cache_size = 0;
// If mmap fails, then give up on the redblack tree cache.
// We set the cache size such that the redblack node allocators think
// the cache is full.
if (GET_SHAPE_TREE()->shape_cache == MAP_FAILED) {
GET_SHAPE_TREE()->shape_cache = 0;
GET_SHAPE_TREE()->cache_size = REDBLACK_CACHE_SIZE;
}
#endif
// Shapes by size pool