16 // use macros to appropriately namespace these.
17 #define size_classes __malloc_size_classes
18 #define ctx __malloc_context
19 #define alloc_meta __malloc_alloc_meta
20 #define is_allzero __malloc_allzerop
21 #define dump_heap __dump_heap
23 #define malloc __libc_malloc_impl
24 #define realloc __libc_realloc
25 #define free __libc_free
31 #define assert(x) do { if (!(x)) a_crash(); } while(0)
34 #define brk(p) ((uintptr_t)__syscall(SYS_brk, p))
37 #define madvise __madvise
38 #define mremap __mremap
40 #define DISABLE_ALIGNED_ALLOC (__malloc_replaced && !__aligned_alloc_replaced)
42 static inline uint64_t get_random_secret()
44 uint64_t secret = (uintptr_t)&secret * 1103515245;
45 for (size_t i=0; libc.auxv[i]; i+=2)
46 if (libc.auxv[i]==AT_RANDOM)
47 memcpy(&secret, (char *)libc.auxv[i+1]+8, sizeof secret);
52 #define PAGESIZE PAGE_SIZE
55 #define MT (libc.need_locks)
57 #define RDLOCK_IS_EXCLUSIVE 1
59 __attribute__((__visibility__("hidden")))
60 extern int __malloc_lock[1];
62 #define LOCK_OBJ_DEF \
63 int __malloc_lock[1]; \
64 void __malloc_atfork(int who) { malloc_atfork(who); }
66 static inline void rdlock()
68 if (MT) LOCK(__malloc_lock);
70 static inline void wrlock()
72 if (MT) LOCK(__malloc_lock);
74 static inline void unlock()
76 UNLOCK(__malloc_lock);
78 static inline void upgradelock()
81 static inline void resetlock()
86 static inline void malloc_atfork(int who)
89 else if (who>0) resetlock();