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tweak realloc-pool realloc behavior.

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* ignore provided old-size from lua, use internal segment size.
* fix behavior on OOM (leave memory untouched)
This commit is contained in:
Robin Gareus
2016-07-19 15:05:16 +02:00
parent d13435a4e1
commit c1aef0084a
1 changed files with 20 additions and 1 deletions
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21
libs/pbd/reallocpool.cc
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@@ -27,9 +27,12 @@
#include "pbd/reallocpool.h"
#ifdef RAP_WITH_SEGMENT_STATS
#include <assert.h>
#define STATS_segment collect_segment_stats();
#define ASSERT assert
#else
#define STATS_segment
#define ASSERT
#endif
#ifdef RAP_WITH_CALL_STATS
@@ -106,6 +109,8 @@ ReallocPool::~ReallocPool ()
void *
ReallocPool::_realloc (void *ptr, size_t oldsize, size_t newsize) {
void *rv = NULL;
ASSERT (!ptr || oldsize <= _asize (ptr));
oldsize = _asize (ptr); // ignore provided oldsize
if (ptr == 0 && newsize == 0) {
STATS_inc(_n_noop);
@@ -130,6 +135,7 @@ ReallocPool::_realloc (void *ptr, size_t oldsize, size_t newsize) {
}
if (newsize == oldsize) {
ASSERT (_asize (ptr) <= newsize);
STATS_inc(_n_noop);
return ptr;
}
@@ -145,7 +151,9 @@ ReallocPool::_realloc (void *ptr, size_t oldsize, size_t newsize) {
if ((rv = _malloc (newsize))) {
memcpy (rv, ptr, oldsize);
}
_free (ptr);
if (rv) {
_free (ptr);
}
STATS_if(!rv, _n_oom);
STATS_inc(_n_grow);
STATS_hist(_hist_grow, newsize);
@@ -154,6 +162,7 @@ ReallocPool::_realloc (void *ptr, size_t oldsize, size_t newsize) {
}
if (newsize < oldsize) {
ASSERT (_asize (ptr) >= newsize);
#if 0 // re-allocate
if ((rv = _malloc (newsize))) {
memccpy (rv, ptr, newsize);
@@ -205,6 +214,7 @@ ReallocPool::_malloc (size_t s) {
#endif
while (1) { // iterates at most once over the available pool
ASSERT (SEGSIZ != 0);
while (SEGSIZ > 0) {
traversed += SEGSIZ + sop;
if (traversed >= _poolsize) {
@@ -334,6 +344,9 @@ ReallocPool::dumpsegments ()
const poolsize_t sop = sizeof(poolsize_t);
poolsize_t *in = (poolsize_t*) p;
unsigned int traversed = 0;
#ifdef RAP_WITH_CALL_STATS
size_t used = 0;
#endif
printf ("<<<<< %s\n", _name.c_str());
while (1) {
if ((*in) > 0) {
@@ -341,6 +354,9 @@ ReallocPool::dumpsegments ()
printf ("0x%08x data %p\n", traversed + sop , p + sop);
traversed += *in + sop;
p += *in + sop;
#ifdef RAP_WITH_CALL_STATS
used += *in;
#endif
} else if ((*in) < 0) {
printf ("0x%08x free %4d [+%d]\n", traversed, -*in, sop);
traversed += -*in + sop;
@@ -359,6 +375,9 @@ ReallocPool::dumpsegments ()
break;
}
}
#ifdef RAP_WITH_CALL_STATS
ASSERT (_cur_used == used);
#endif
printf (">>>>>\n");
}