diff options
Diffstat (limited to 'libc/stdlib/malloc')
| -rw-r--r-- | libc/stdlib/malloc/free.c | 21 | ||||
| -rw-r--r-- | libc/stdlib/malloc/malloc.c | 2 |
2 files changed, 10 insertions, 13 deletions
diff --git a/libc/stdlib/malloc/free.c b/libc/stdlib/malloc/free.c index f7d8fc18d..3074ff5e6 100644 --- a/libc/stdlib/malloc/free.c +++ b/libc/stdlib/malloc/free.c @@ -18,7 +18,7 @@ #include "malloc.h" #include "heap.h" - + void free (void *mem) { @@ -35,23 +35,23 @@ free (void *mem) __malloc_lock (); + /* Put MEM back in the heap, and get the free-area it was placed in. */ fa = __heap_free (&__malloc_heap, mem, size); - /* Now we check to see if FA has grown big enough that it should be + /* See if the free-area FA has grown big enough that it should be unmapped. */ if (HEAP_FREE_AREA_SIZE (fa) < MALLOC_UNMAP_THRESHOLD) - /* Nothing left to do, just release the lock. */ + /* Nope, nothing left to do, just release the lock. */ __malloc_unlock (); else - /* Try to unmap FA. */ + /* Yup, try to unmap FA. */ { - unsigned long start, end; + unsigned long start = (unsigned long)HEAP_FREE_AREA_START (fa); + unsigned long end = (unsigned long)HEAP_FREE_AREA_END (fa); #ifndef MALLOC_USE_SBRK unsigned long unmap_start, unmap_end; #endif - end = (unsigned long)HEAP_FREE_AREA_END (fa); - #ifdef MALLOC_USE_SBRK /* Get the sbrk lock so that the two possible calls to sbrk below are guaranteed to be contiguous. */ @@ -68,17 +68,13 @@ free (void *mem) if ((void *)end != sbrk (0)) { MALLOC_DEBUG (" not unmapping: 0x%lx - 0x%lx (%d bytes)\n", - (unsigned long)HEAP_FREE_AREA_START (fa), - (unsigned long)HEAP_FREE_AREA_END (fa), - fa->size); + start, end, end - start); __malloc_unlock_sbrk (); __malloc_unlock (); return; } #endif - start = (unsigned long)HEAP_FREE_AREA_START (fa); - MALLOC_DEBUG (" unmapping: 0x%lx - 0x%lx (%ld bytes)\n", start, end, end - start); @@ -136,6 +132,7 @@ free (void *mem) __malloc_unlock (); if (unmap_end > unmap_start) + /* Finally, actually unmap the memory. */ munmap ((void *)unmap_start, unmap_end - unmap_start); #endif /* MALLOC_USE_SBRK */ diff --git a/libc/stdlib/malloc/malloc.c b/libc/stdlib/malloc/malloc.c index e6b9c0d66..2ec12218c 100644 --- a/libc/stdlib/malloc/malloc.c +++ b/libc/stdlib/malloc/malloc.c @@ -31,7 +31,7 @@ malloc_mutex_t __malloc_sbrk_lock; # endif /* MALLOC_USE_SBRK */ #endif /* MALLOC_USE_LOCKING */ - + void * malloc (size_t size) { |