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
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/* lockut.c: LOCK UTILIZATION TEST
 *
 * $Id: //info.ravenbrook.com/project/mps/master/code/lockut.c#9 $
 * Copyright (c) 2001-2020 Ravenbrook Limited.  See end of file for license.
 */

#include "mps.h"
#include "mpsavm.h"
#include "mpscmfs.h"
#include "mpm.h"
#include "testlib.h"
#include "testthr.h"

#include <stdio.h> /* printf */


#define nTHREADS 4

static Lock lock;
static unsigned long shared, tmp;


static void incR(unsigned long i)
{
  LockClaimRecursive(lock);
  if (i < 100) {
    while(i--) {
      tmp = shared;
      shared = tmp + 1;
    }
  } else {
    incR(i >> 1);
    incR( (i+1) >> 1);
  }
  LockReleaseRecursive(lock);
}


static void inc(unsigned long i)
{
  incR( (i+1) >>1);
  i >>= 1;
  while (i) {
    LockClaim(lock);
    if (i > 10000) {
      incR(5000);
      i -= 5000;
    }
    tmp = shared;
    shared = tmp+1;
    i--;
    LockRelease(lock);
  }
}


#define COUNT 100000l
static void *thread0(void *p)
{
  unsigned i;
  testlib_unused(p);
  LockClaimGlobal();
  LockReleaseGlobal();
  for (i = 0; i < COUNT; ++i)
    LockClaimGlobalRecursive();
  for (i = 0; i < COUNT; ++i)
    LockReleaseGlobalRecursive();
  inc(COUNT);
  return NULL;
}


int main(int argc, char *argv[])
{
  mps_arena_t arena;
  mps_pool_t pool;
  mps_addr_t p;
  testthr_t t[10];
  unsigned i;

  testlib_init(argc, argv);

  die(mps_arena_create_k(&arena, mps_arena_class_vm(), mps_args_none),
      "arena_create");
  MPS_ARGS_BEGIN(args) {
    MPS_ARGS_ADD(args, MPS_KEY_MFS_UNIT_SIZE, LockSize());
    die(mps_pool_create_k(&pool, arena, mps_class_mfs(), args), "pool_create");
  } MPS_ARGS_END(args);

  die(mps_alloc(&p, pool, LockSize()), "alloc");
  lock = p;
  Insist(lock != NULL);

  LockInit(lock);
  UNUSED(argc);

  shared = 0;

  for(i = 0; i < nTHREADS; i++)
    testthr_create(&t[i], thread0, NULL);

  for(i = 0; i < nTHREADS; i++)
    testthr_join(&t[i], NULL);

  Insist(shared == nTHREADS*COUNT);

  LockFinish(lock);

  mps_free(pool, lock, LockSize());
  mps_pool_destroy(pool);
  mps_arena_destroy(arena);

  printf("%s: Conclusion: Failed to find any defects.\n", argv[0]);
  return 0;
}


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */