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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
#include "apr_shm.h"
#include "apr_thread_proc.h"
#include "apr_file_io.h"
#include "apr_proc_mutex.h"
#include "apr_errno.h"
#include "apr_general.h"
#include "apr_getopt.h"
#include "errno.h"
#include <stdio.h>
#include <stdlib.h>
#include "test_apr.h"
#if APR_HAS_FORK
#define MAX_ITER 200
#define CHILDREN 6
#define MAX_COUNTER (MAX_ITER * CHILDREN)
static apr_proc_mutex_t *proc_lock;
static volatile int *x;
/* a slower more racy way to implement (*x)++ */
static int increment(int n)
{
apr_sleep(1);
return n+1;
}
static void make_child(CuTest *tc, apr_proc_t **proc, apr_pool_t *p)
{
apr_status_t rv;
*proc = apr_pcalloc(p, sizeof(**proc));
/* slight delay to allow things to settle */
apr_sleep (1);
rv = apr_proc_fork(*proc, p);
if (rv == APR_INCHILD) {
int i = 0;
/* The parent process has setup all processes to call apr_terminate
* at exit. But, that means that all processes must also call
* apr_initialize at startup. You cannot have an unequal number
* of apr_terminate and apr_initialize calls. If you do, bad things
* will happen. In this case, the bad thing is that if the mutex
* is a semaphore, it will be destroyed before all of the processes
* die. That means that the test will most likely fail.
*/
apr_initialize();
if (apr_proc_mutex_child_init(&proc_lock, NULL, p))
exit(1);
do {
if (apr_proc_mutex_lock(proc_lock))
exit(1);
i++;
*x = increment(*x);
if (apr_proc_mutex_unlock(proc_lock))
exit(1);
} while (i < MAX_ITER);
exit(0);
}
CuAssert(tc, "fork failed", rv == APR_INPARENT);
}
/* Wait for a child process and check it terminated with success. */
static void await_child(CuTest *tc, apr_proc_t *proc)
{
int code;
apr_exit_why_e why;
apr_status_t rv;
rv = apr_proc_wait(proc, &code, &why, APR_WAIT);
CuAssert(tc, "child did not terminate with success",
rv == APR_CHILD_DONE && why == APR_PROC_EXIT && code == 0);
}
static void test_exclusive(CuTest *tc, const char *lockname)
{
apr_proc_t *child[CHILDREN];
apr_status_t rv;
int n;
rv = apr_proc_mutex_create(&proc_lock, lockname, APR_LOCK_DEFAULT, p);
apr_assert_success(tc, "create the mutex", rv);
for (n = 0; n < CHILDREN; n++)
make_child(tc, &child[n], p);
for (n = 0; n < CHILDREN; n++)
await_child(tc, child[n]);
CuAssert(tc, "Locks don't appear to work", *x == MAX_COUNTER);
}
#endif
static void proc_mutex(CuTest *tc)
{
#if APR_HAS_FORK
apr_status_t rv;
const char *shmname = "tpm.shm";
apr_shm_t *shm;
/* Use anonymous shm if available. */
rv = apr_shm_create(&shm, sizeof(int), NULL, p);
if (rv == APR_ENOTIMPL) {
apr_file_remove(shmname, p);
rv = apr_shm_create(&shm, sizeof(int), shmname, p);
}
apr_assert_success(tc, "create shm segment", rv);
x = apr_shm_baseaddr_get(shm);
test_exclusive(tc, NULL);
#else
CuNotImpl(tc, "APR lacks fork() support");
#endif
}
CuSuite *testprocmutex(void)
{
CuSuite *suite = CuSuiteNew("Cross-Process Mutexes");
SUITE_ADD_TEST(suite, proc_mutex);
return suite;
}
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