1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
/* 
TEST_HEADER
 id = $Id: //info.ravenbrook.com/project/mps/master/test/function/139.c#7 $
 summary = MVFF alloc from emergency list test
 language = c
 link = testlib.o
END_HEADER
*/

/* MVFF will put free blocks on emergency lists if it cannot allocate
   in the CBS. There is a bug in anchovy.1 in which the emergency lists
   are not checked when allocating, so some allocs will fail needlessly.
*/ 

#include "testlib.h"
#include "mpscmvff.h"
#include "mpsavm.h"

#define COMLIMIT1 (10*1024*1024)
#define COMLIMIT2 (12*1024*1024)
#define SMALLSIZE (8)
#define NSMALL (4*1024)
#define BIGSIZE (64)
#define EXTENDBY (8*1024)
#define MAXLARGE (1000*1024)

mps_arena_t arena;

static mps_addr_t
  largeObjects[MAXLARGE],
  smallObjects[NSMALL];

static void test(void *stack_pointer)
{
 mps_thr_t thread;
 mps_pool_t pool;
 unsigned int i;
 unsigned long nLarge;

 cdie(mps_arena_create(&arena, mps_arena_class_vm(),
  (size_t) (1024*1024*50)), "create arena");
 cdie(mps_thread_reg(&thread, arena), "register thread");

 mps_arena_commit_limit_set(arena, COMLIMIT1);

 die(mps_pool_create(&pool, arena, mps_class_mvff(),
                     (size_t)EXTENDBY, (size_t)8, (mps_align_t)8,
                     (mps_bool_t)0, (mps_bool_t)0, (mps_bool_t)1),
     "create MVFF pool");

 for (i = 0; i < NSMALL; i++) {
  die(mps_alloc(&smallObjects[i], pool, SMALLSIZE), "small alloc failed");
 }

 nLarge = 0;
 while (mps_alloc(&largeObjects[nLarge], pool, BIGSIZE) == MPS_RES_OK) {
  nLarge ++;
 }

 report("nLarge", "%lu", nLarge);

 for (i = 0; i < NSMALL; i += 2) {
  mps_free(pool, smallObjects[i], SMALLSIZE);
 }

 comment("Freed every other small object.");

 /* The CBS should be in emergency mode now. */

 mps_free(pool, largeObjects[3], BIGSIZE);
 die(mps_alloc(&largeObjects[3], pool, BIGSIZE), "free and alloc failed");

 mps_pool_destroy(pool);
 mps_thread_dereg(thread);
 mps_arena_destroy(arena);
}

int main(void) {
 run_test(test);
 pass();
 return 0;
}