MM *mm_create_with_shmid(int shmid)
{
#if defined(MM_SHMT_IPCSHM)
mem_core *mc;
size_t size;
void *area = ((void *) -1);
struct shmid_ds shmbuf;
if (shmctl(shmid, IPC_STAT, &shmbuf) == -1)
{
FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to get status of shared memory");
}
//Just init static lock/unlock structures for semop() which defined in mm_core.c
mm_core_create(0, NULL);
size = shmbuf.shm_segsz;
if ((area = (void *) shmat(shmid, NULL, 0)) == ((void *) -1))
FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to attach shared memory");
mc = (mem_core *) area;
if(mc->mc_size != size)
{
FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "invalid shmid which is not created by mm_create");
}
return (MM *) mc;
#endif /* MM_SHMT_IPCSHM */
BEGIN_FAILURE
#if defined(MM_SHMT_IPCSHM)
if (area != ((void *)-1))
shmdt(area);
#endif
return NULL;
}
int main(int argc, char *argv[])
{
unsigned char *core;
int i;
size_t s, s2;
pid_t pid;
int size;
MM *mm;
int n;
char *cp[1025];
int version;
struct count_test { int count; int prev; } *ct;
setbuf(stderr, NULL);
/*
**
** Test Global Library API
**
*/
fprintf(stderr, "\n*** TESTING GLOBAL LIBRARY API ***\n\n");
fprintf(stderr, "Fetching library version\n");
version = mm_lib_version();
FAILED_IF(version == 0x0);
fprintf(stderr, "version = 0x%X\n", version);
/*
**
** Test Low-Level Shared Memory API
**
*/
fprintf(stderr, "\n*** TESTING LOW-LEVEL SHARED MEMORY API ***\n");
fprintf(stderr, "\n=== Testing Memory Segment Access ===\n");
fprintf(stderr, "Creating 16KB shared memory core area\n");
core = mm_core_create(1024*16, NULL);
FAILED_IF(core == NULL);
s = mm_core_size(core);
FAILED_IF(s == 0);
fprintf(stderr, "actually allocated core size = %d\n", s);
fprintf(stderr, "Writing 0xF5 bytes to shared memory core area\n");
for (i = 0; i < s; i++) {
fprintf(stderr, "write to core[%06d]\r", i);
core[i] = 0xF5;
}
fprintf(stderr, "\n");
fprintf(stderr, "Reading back 0xF5 bytes from shared memory core area\n");
for (i = 0; i < s; i++) {
fprintf(stderr, "read from core[%06d]\r", i);
if (core[i] != 0xF5) {
fprintf(stderr, "Offset %d: 0xF5 not found (found 0x%X\n", i, core[i]);
exit(0);
}
}
fprintf(stderr, "\n");
fprintf(stderr, "Destroying shared memory core area\n");
mm_core_delete(core);
fprintf(stderr, "\n=== Testing Memory Locking ===\n");
fprintf(stderr, "Creating small shared memory core area\n");
ct = mm_core_create(sizeof(struct count_test), NULL);
FAILED_IF(ct == NULL);
s = mm_core_size(ct);
FAILED_IF(s == 0);
fprintf(stderr, "actually allocated core size = %d\n", s);
ct->prev = 0;
ct->count = 1;
if ((pid = fork()) == 0) {
/* child */
while (ct->count < 32768) {
if (!mm_core_lock(ct, MM_LOCK_RW)) {
fprintf(stderr, "locking failed (child)\n");
FAILED_IF(1);
}
if (ct->prev != (ct->count-1)) {
fprintf(stderr, "Failed, prev=%d != count=%d\n", ct->prev, ct->count);
exit(1);
}
ct->count += 1;
fprintf(stderr, "count=%06d (child )\r", ct->count);
ct->prev += 1;
if (!mm_core_unlock(ct)) {
fprintf(stderr, "locking failed (child)\n");
FAILED_IF(1);
}
}
exit(0);
}
/* parent ... */
while (ct->count < 32768) {
if (!mm_core_lock(ct, MM_LOCK_RW)) {
fprintf(stderr, "locking failed (parent)\n");
FAILED_IF(1);
}
if (ct->prev != (ct->count-1)) {
fprintf(stderr, "Failed, prev=%d != count=%d\n", ct->prev, ct->count);
exit(1);
}
ct->count += 1;
fprintf(stderr, "count=%06d (parent)\r", ct->count);
ct->prev += 1;
if (!mm_core_unlock(ct)) {
fprintf(stderr, "locking failed (parent)\n");
kill(pid, SIGTERM);
FAILED_IF(1);
}
}
waitpid(pid, NULL, 0);
fprintf(stderr, "\n");
fprintf(stderr, "Destroying shared memory core area\n");
mm_core_delete(ct);
/*
**
** Test Standard Malloc-style API
**
*/
fprintf(stderr, "\n*** TESTING STANDARD MALLOC-STYLE API ***\n");
fprintf(stderr, "\n=== Testing Allocation ===\n");
fprintf(stderr, "Creating MM object\n");
size = mm_maxsize();
if (size > 1024*1024*1)
size = 1024*1024*1;
mm = mm_create(size, NULL);
FAILED_IF(mm == NULL)
mm_display_info(mm);
s = mm_available(mm);
FAILED_IF(s == 0);
fprintf(stderr, "actually available bytes = %d\n", s);
fprintf(stderr, "Allocating areas inside MM\n");
n = 0;
for (i = 0; i < 1024; i++)
cp[i] = NULL;
for (i = 0; i < 1024; i++) {
fprintf(stderr, "total=%09d allocated=%09d add=%06d\r", s, n, (i+1)*(i+1));
s2 = mm_available(mm);
if ((i+1)*(i+1) > s2) {
cp[i] = mm_malloc(mm, (i+1)*(i+1));
if (cp[i] != NULL) {
fprintf(stderr, "\nExpected an out of memory situation. Hmmmmm\n");
FAILED_IF(1);
}
break;
}
cp[i] = mm_malloc(mm, (i+1)*(i+1));
n += (i+1)*(i+1);
FAILED_IF(cp[i] == NULL)
memset(cp[i], 0xF5, (i+1)*(i+1));
}
mm_display_info(mm);
fprintf(stderr, "\n=== Testing Defragmentation ===\n");
fprintf(stderr, "Fragmenting memory area by freeing some selected areas\n");
for (i = 0; i < 1024; i++) {
if (i % 2 == 0)
continue;
if (cp[i] != NULL)
mm_free(mm, cp[i]);
cp[i] = NULL;
}
mm_display_info(mm);
fprintf(stderr, "Freeing all areas\n");
for (i = 0; i < 1024; i++) {
mm_free(mm, cp[i]);
}
mm_display_info(mm);
fprintf(stderr, "Checking for memory leaks\n");
s2 = mm_available(mm);
if (s != s2) {
fprintf(stderr, "Something is leaking, we've lost %d bytes\n", s - s2);
FAILED_IF(1);
}
else {
fprintf(stderr, "Fine, we have again %d bytes available\n", s2);
}
fprintf(stderr, "Destroying MM object\n");
mm_destroy(mm);
/******/
fprintf(stderr, "\nOK - ALL TESTS SUCCESSFULLY PASSED.\n\n");
exit(0);
}