diff options
Diffstat (limited to 'src/bump_alloc.h')
| -rw-r--r-- | src/bump_alloc.h | 53 |
1 files changed, 0 insertions, 53 deletions
diff --git a/src/bump_alloc.h b/src/bump_alloc.h deleted file mode 100644 index 6a651a1..0000000 --- a/src/bump_alloc.h +++ /dev/null @@ -1,53 +0,0 @@ -#include <assert.h> -#include <errno.h> -#include <stddef.h> /* NULL, size_t */ -#include <stdint.h> /* uintptr_t */ -#include <sys/mman.h> /* mmap */ - -#ifndef MEMSIZE -#define MEMSIZE 1024*4*1024*1024l -#endif - -#define unlikely(x) __builtin_expect((x),0) - -#ifdef __cplusplus -extern "C" { -#endif - -typedef struct bumpptr { - uintptr_t end; - uintptr_t ptr; -} bumpptr_t; - -__thread bumpptr_t* tsd = NULL; - -static inline void* bump_up(size_t size, size_t align) { - assert(align % 2 == 0); - - if (unlikely(tsd == NULL)) { - void* mem_start = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0); - if(mem_start == MAP_FAILED) { - perror("mmap"); - return NULL; - } - tsd = (bumpptr_t*)mem_start; - tsd->ptr = (uintptr_t)mem_start + sizeof(bumpptr_t); - tsd->end = (uintptr_t)mem_start + MEMSIZE; - } - - // align ptr; - uintptr_t aligned = (tsd->ptr + align - 1) & ~(align - 1); - - uintptr_t new_ptr = aligned + size; - if (new_ptr > tsd->end) { - errno = ENOMEM; - return NULL; - } else { - tsd->ptr = new_ptr; - return (void*)aligned; - } -} - -#ifdef __cplusplus -} -#endif |
