diff options
Diffstat (limited to 'libc-top-half/musl/src/malloc/mallocng/donate.c')
-rw-r--r-- | libc-top-half/musl/src/malloc/mallocng/donate.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/malloc/mallocng/donate.c b/libc-top-half/musl/src/malloc/mallocng/donate.c new file mode 100644 index 0000000..41d850f --- /dev/null +++ b/libc-top-half/musl/src/malloc/mallocng/donate.c @@ -0,0 +1,39 @@ +#include <stdlib.h> +#include <stdint.h> +#include <limits.h> +#include <string.h> +#include <sys/mman.h> +#include <errno.h> + +#include "meta.h" + +static void donate(unsigned char *base, size_t len) +{ + uintptr_t a = (uintptr_t)base; + uintptr_t b = a + len; + a += -a & (UNIT-1); + b -= b & (UNIT-1); + memset(base, 0, len); + for (int sc=47; sc>0 && b>a; sc-=4) { + if (b-a < (size_classes[sc]+1)*UNIT) continue; + struct meta *m = alloc_meta(); + m->avail_mask = 0; + m->freed_mask = 1; + m->mem = (void *)a; + m->mem->meta = m; + m->last_idx = 0; + m->freeable = 0; + m->sizeclass = sc; + m->maplen = 0; + *((unsigned char *)m->mem+UNIT-4) = 0; + *((unsigned char *)m->mem+UNIT-3) = 255; + m->mem->storage[size_classes[sc]*UNIT-4] = 0; + queue(&ctx.active[sc], m); + a += (size_classes[sc]+1)*UNIT; + } +} + +void __malloc_donate(char *start, char *end) +{ + donate((void *)start, end-start); +} |