Document the growth policy, and Yves suggested a better arbitary

[perl5.git] / malloc.c

diff --git a/malloc.c b/malloc.c
index 63f6630..a9245e8 100644 (file)
--- a/malloc.c
+++ b/malloc.c
@@ -1173,7 +1173,7 @@ perl_get_emergency_buffer(IV *size)
     }
 
     SvPOK_off(sv);
-    SvPV_set(sv, Nullch);
+    SvPV_set(sv, NULL);
     SvCUR_set(sv, 0);
     SvLEN_set(sv, 0);
     *size = malloced_size(pv) + M_OVERHEAD;
@@ -1249,7 +1249,7 @@ emergency_sbrk(MEM_SIZE size)
        if (emergency_buffer_size) {
            add_to_chain(emergency_buffer, emergency_buffer_size, 0);
            emergency_buffer_size = 0;
-           emergency_buffer = Nullch;
+           emergency_buffer = NULL;
            have = 1;
        }
 
@@ -1276,7 +1276,7 @@ emergency_sbrk(MEM_SIZE size)
     MALLOC_UNLOCK;
     emergency_sbrk_croak("Out of memory during request for %"UVuf" bytes, total sbrk() is %"UVuf" bytes", (UV)size, (UV)(goodsbrk + sbrk_slack));
     /* NOTREACHED */
-    return Nullch;
+    return NULL;
 }
 
 #else /*  !defined(PERL_EMERGENCY_SBRK) */
@@ -1295,6 +1295,7 @@ write2(char *mess)
 static void
 botch(char *diag, char *s, char *file, int line)
 {
+    dVAR;
     if (!(PERL_MAYBE_ALIVE && PERL_GET_THX))
        goto do_write;
     else {
@@ -1408,6 +1409,7 @@ cmp_pat_4bytes(unsigned char *s, size_t nbytes, const unsigned char *fill)
 Malloc_t
 Perl_malloc(register size_t nbytes)
 {
+        dVAR;
        register union overhead *p;
        register int bucket;
        register MEM_SIZE shiftr;
@@ -1665,6 +1667,7 @@ get_from_bigger_buckets(int bucket, MEM_SIZE size)
 static union overhead *
 getpages(MEM_SIZE needed, int *nblksp, int bucket)
 {
+    dVAR;
     /* Need to do (possibly expensive) system call. Try to
        optimize it for rare calling. */
     MEM_SIZE require = needed - sbrked_remains;
@@ -1865,6 +1868,7 @@ getpages_adjacent(MEM_SIZE require)
 static void
 morecore(register int bucket)
 {
+        dVAR;
        register union overhead *ovp;
        register int rnu;       /* 2^rnu bytes will be requested */
        int nblks;              /* become nblks blocks of the desired size */
@@ -1999,6 +2003,7 @@ morecore(register int bucket)
 Free_t
 Perl_mfree(void *mp)
 {
+        dVAR;
        register MEM_SIZE size;
        register union overhead *ovp;
        char *cp = (char*)mp;
@@ -2103,6 +2108,7 @@ Perl_mfree(void *mp)
 Malloc_t
 Perl_realloc(void *mp, size_t nbytes)
 {
+        dVAR;
        register MEM_SIZE onb;
        union overhead *ovp;
        char *res;
@@ -2141,7 +2147,7 @@ Perl_realloc(void *mp, size_t nbytes)
                    bad_free_warn = (pbf) ? atoi(pbf) : 1;
                }
                if (!bad_free_warn)
-                   return Nullch;
+                   return NULL;
 #ifdef RCHECK
 #ifdef PERL_CORE
                {
@@ -2169,7 +2175,7 @@ Perl_realloc(void *mp, size_t nbytes)
                warn("%s", "Bad realloc() ignored");
 #endif
 #endif
-               return Nullch;                  /* sanity */
+               return NULL;                    /* sanity */
            }
 
        onb = BUCKET_SIZE_REAL(bucket);