auto_realloc_test.m [plain text]
/*
* Copyright (c) 2009 Apple Inc. All rights reserved.
*
* @APPLE_APACHE_LICENSE_HEADER_START@
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @APPLE_APACHE_LICENSE_HEADER_END@
*/
//
// auto_realloc_test.m
// gctests
//
// Created by Blaine Garst on 2/23/09.
// Copyright 2009 Apple. All rights reserved.
//
// CONFIG GC -C99 rdar://6593098
#import <Foundation/Foundation.h>
#import <objc/objc-auto.h>
#import <malloc/malloc.h>
//#import </usr/local/include/auto_zone.h>
#if 0
typedef struct malloc_statistics_t {
unsigned blocks_in_use;
size_t size_in_use;
size_t max_size_in_use; /* high water mark of touched memory */
size_t size_allocated; /* reserved in memory */
} malloc_statistics_t;
#endif
void doTest() {
malloc_zone_t *zone = (malloc_zone_t *)NSDefaultMallocZone();
for (int i = 0; i < 1000; ++i) {
char *buffer = (char *)malloc_zone_malloc(zone, 1024);
char *old_buffer = buffer;
buffer = (char *)malloc_zone_realloc(zone, buffer, 512);
free(buffer);
}
}
int iterationsTillStable() {
int iterationsSinceMaxChanged = 0;
int iterationCount = 0;
int max_blocks_in_use = 0;
while (iterationsSinceMaxChanged < 5) {
doTest();
malloc_statistics_t stats;
malloc_zone_statistics((malloc_zone_t *)NSDefaultMallocZone(), &stats);
if (stats.blocks_in_use > max_blocks_in_use) {
max_blocks_in_use = stats.blocks_in_use;
iterationsSinceMaxChanged = 0;
}
else {
++iterationsSinceMaxChanged;
}
if (++iterationCount > 200) {
printf("blocks in use ( return -1;
}
objc_clear_stack(0);
objc_collect(OBJC_EXHAUSTIVE_COLLECTION);
}
return iterationCount;
}
int main(int argc, char *argv[]) {
/* This test seems to be unstable. Disabling. */
return 0;
int iterations;
objc_startCollectorThread();
iterations = iterationsTillStable();
if (iterations > 0) {
printf(" return 0;
}
return 1;
}