static void *
vmem_mmap_top_alloc(vmem_t *src, size_t size, int vmflags)
{
void *ret;
void *buf;
int old_errno = errno;
ret = vmem_alloc(src, size, VM_NOSLEEP);
if (ret) {
errno = old_errno;
return (ret);
}
/*
* Need to grow the heap
*/
#ifdef _WIN32
buf = VirtualAlloc(NULL, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
if (buf == NULL) buf = MAP_FAILED;
#elif defined(MAP_ALIGN)
buf = mmap((void*)CHUNKSIZE, size, FREE_PROT, FREE_FLAGS | MAP_ALIGN,
-1, 0);
#else
buf = mmap(0, size, FREE_PROT, FREE_FLAGS, -1, 0);
#endif
if (buf != MAP_FAILED) {
ret = _vmem_extend_alloc(src, buf, size, size, vmflags);
if (ret != NULL)
return (ret);
else {
(void) munmap(buf, size);
errno = old_errno;
return (NULL);
}
} else {
/*
* Growing the heap failed. The allocation above will
* already have called umem_reap().
*/
ASSERT((vmflags & VM_NOSLEEP) == VM_NOSLEEP);
errno = old_errno;
return (NULL);
}
}
static void *
vmem_mmap_top_alloc(vmem_t *src, size_t size, int vmflags)
{
void *ret;
void *buf;
int old_errno = errno;
ret = vmem_alloc(src, size, VM_NOSLEEP);
if (ret) {
errno = old_errno;
return (ret);
}
/*
* Need to grow the heap
*/
#ifdef _WIN32
buf = VirtualAlloc(NULL, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
if (buf == NULL) buf = MAP_FAILED;
#else
int tries = 0;
do {
tries++;
buf = mmap(
#ifdef MAP_ALIGN
(void *)CHUNKSIZE,
#else
0,
#endif
size, FREE_PROT, FREE_FLAGS
#ifdef MAP_ALIGN
| MAP_ALIGN
#endif
, -1, 0);
#endif
if (buf == MAP_FAILED) {
if (tries == 1)
raise_mmap();
else
syslog(LOG_WARNING,
"vmem_mmap_top_alloc: mmap failed again after raising mmaps");
}
} while (buf == MAP_FAILED && tries < 2);
if (buf != MAP_FAILED) {
ret = _vmem_extend_alloc(src, buf, size, size, vmflags);
if (ret != NULL)
return (ret);
else {
(void) munmap(buf, size);
errno = old_errno;
return (NULL);
}
} else {
/*
* Growing the heap failed. The allocation above will
* already have called umem_reap().
*/
ASSERT((vmflags & VM_NOSLEEP) == VM_NOSLEEP);
errno = old_errno;
return (NULL);
}
}
