diff options
Diffstat (limited to 'src/malloc/malloc.c')
| -rw-r--r-- | src/malloc/malloc.c | 53 |
1 files changed, 14 insertions, 39 deletions
diff --git a/src/malloc/malloc.c b/src/malloc/malloc.c index 70c7b3f3..4f61807b 100644 --- a/src/malloc/malloc.c +++ b/src/malloc/malloc.c @@ -154,11 +154,22 @@ void __dump_heap(int x) static struct chunk *expand_heap(size_t n) { + static int init; struct chunk *w; uintptr_t new; lock(mal.brk_lock); + if (!init) { + mal.brk = __brk(0); +#ifdef SHARED + mal.brk = mal.brk + PAGE_SIZE-1 & -PAGE_SIZE; +#endif + mal.brk = mal.brk + 2*SIZE_ALIGN-1 & -SIZE_ALIGN; + mal.heap = (void *)mal.brk; + init = 1; + } + if (n > SIZE_MAX - mal.brk - 2*PAGE_SIZE) goto fail; new = mal.brk + n + SIZE_ALIGN + PAGE_SIZE - 1 & -PAGE_SIZE; n = new - mal.brk; @@ -186,6 +197,9 @@ static struct chunk *expand_heap(size_t n) return area; } + w = MEM_TO_CHUNK(mal.heap); + w->psize = 0 | C_INUSE; + w = MEM_TO_CHUNK(new); w->psize = n | C_INUSE; w->csize = 0 | C_INUSE; @@ -203,44 +217,6 @@ fail: return 0; } -static int init_malloc(size_t n) -{ - static volatile int init, waiters; - int state; - struct chunk *c; - - if (init == 2) return 0; - - while ((state=a_swap(&init, 1)) == 1) - __wait(&init, &waiters, 1, 1); - if (state) { - a_store(&init, 2); - return 0; - } - - mal.brk = __brk(0); -#ifdef SHARED - mal.brk = mal.brk + PAGE_SIZE-1 & -PAGE_SIZE; -#endif - mal.brk = mal.brk + 2*SIZE_ALIGN-1 & -SIZE_ALIGN; - - c = expand_heap(n); - - if (!c) { - a_store(&init, 0); - if (waiters) __wake(&init, 1, 1); - return -1; - } - - mal.heap = (void *)c; - c->psize = 0 | C_INUSE; - free(CHUNK_TO_MEM(c)); - - a_store(&init, 2); - if (waiters) __wake(&init, -1, 1); - return 1; -} - static int adjust_size(size_t *n) { /* Result of pointer difference must fit in ptrdiff_t. */ @@ -375,7 +351,6 @@ void *malloc(size_t n) for (;;) { uint64_t mask = mal.binmap & -(1ULL<<i); if (!mask) { - if (init_malloc(n) > 0) continue; c = expand_heap(n); if (!c) return 0; if (alloc_rev(c)) { |