static gpointer
alloc_sb (Descriptor *desc)
{
static int pagesize = -1;
gpointer sb_header;
if (pagesize == -1)
pagesize = mono_pagesize ();
sb_header = desc->block_size == pagesize ?
mono_valloc (NULL, desc->block_size, prot_flags_for_activate (TRUE), desc->heap->account_type) :
mono_valloc_aligned (desc->block_size, desc->block_size, prot_flags_for_activate (TRUE), desc->heap->account_type);
g_assertf (sb_header, "Failed to allocate memory for the lock free allocator");
g_assert (sb_header == sb_header_for_addr (sb_header, desc->block_size));
*(Descriptor**)sb_header = desc;
//g_print ("sb %p for %p\n", sb_header, desc);
return (char*)sb_header + LOCK_FREE_ALLOC_SB_HEADER_SIZE;
}
static Descriptor*
desc_alloc (MonoMemAccountType type)
{
MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
Descriptor *desc;
for (;;) {
gboolean success;
desc = (Descriptor *) mono_get_hazardous_pointer ((volatile gpointer *)&desc_avail, hp, 1);
if (desc) {
Descriptor *next = desc->next;
success = (mono_atomic_cas_ptr ((volatile gpointer *)&desc_avail, next, desc) == desc);
} else {
size_t desc_size = sizeof (Descriptor);
Descriptor *d;
int i;
desc = (Descriptor *) mono_valloc (NULL, desc_size * NUM_DESC_BATCH, prot_flags_for_activate (TRUE), type);
g_assertf (desc, "Failed to allocate memory for the lock free allocator");
/* Organize into linked list. */
d = desc;
for (i = 0; i < NUM_DESC_BATCH; ++i) {
Descriptor *next = (i == (NUM_DESC_BATCH - 1)) ? NULL : (Descriptor*)((char*)desc + ((i + 1) * desc_size));
d->next = next;
mono_lock_free_queue_node_init (&d->node, TRUE);
d = next;
}
mono_memory_write_barrier ();
success = (mono_atomic_cas_ptr ((volatile gpointer *)&desc_avail, desc->next, NULL) == NULL);
if (!success)
mono_vfree (desc, desc_size * NUM_DESC_BATCH, type);
}
mono_hazard_pointer_clear (hp, 1);
if (success)
break;
}
g_assert (!desc->in_use);
desc->in_use = TRUE;
return desc;
}
/* size must be a power of 2 */
void*
sgen_alloc_os_memory_aligned (size_t size, mword alignment, SgenAllocFlags flags, const char *assert_description)
{
void *ptr;
g_assert (!(flags & ~(SGEN_ALLOC_HEAP | SGEN_ALLOC_ACTIVATE)));
ptr = mono_valloc_aligned (size, alignment, prot_flags_for_activate (flags & SGEN_ALLOC_ACTIVATE));
sgen_assert_memory_alloc (ptr, size, assert_description);
if (ptr) {
SGEN_ATOMIC_ADD_P (total_alloc, size);
total_alloc_max = MAX (total_alloc_max, total_alloc);
}
return ptr;
}
static Descriptor*
desc_alloc (void)
{
MonoThreadHazardPointers *hp = mono_hazard_pointer_get ();
Descriptor *desc;
for (;;) {
gboolean success;
desc = (Descriptor *) get_hazardous_pointer ((gpointer * volatile)&desc_avail, hp, 1);
if (desc) {
Descriptor *next = desc->next;
success = (InterlockedCompareExchangePointer ((gpointer * volatile)&desc_avail, next, desc) == desc);
} else {
size_t desc_size = sizeof (Descriptor);
Descriptor *d;
int i;
desc = (Descriptor *) mono_valloc (0, desc_size * NUM_DESC_BATCH, prot_flags_for_activate (TRUE));
/* Organize into linked list. */
d = desc;
for (i = 0; i < NUM_DESC_BATCH; ++i) {
Descriptor *next = (i == (NUM_DESC_BATCH - 1)) ? NULL : (Descriptor*)((char*)desc + ((i + 1) * desc_size));
d->next = next;
mono_lock_free_queue_node_init (&d->node, TRUE);
d = next;
}
mono_memory_write_barrier ();
success = (InterlockedCompareExchangePointer ((gpointer * volatile)&desc_avail, desc->next, NULL) == NULL);
if (!success)
mono_vfree (desc, desc_size * NUM_DESC_BATCH);
}
mono_hazard_pointer_clear (hp, 1);
if (success)
break;
}
g_assert (!desc->in_use);
desc->in_use = TRUE;
return desc;
}
/*
* Allocate a big chunk of memory from the OS (usually 64KB to several megabytes).
* This must not require any lock.
*/
void*
sgen_alloc_os_memory (size_t size, SgenAllocFlags flags, const char *assert_description)
{
void *ptr;
g_assert (!(flags & ~(SGEN_ALLOC_HEAP | SGEN_ALLOC_ACTIVATE)));
ptr = mono_valloc (0, size, prot_flags_for_activate (flags & SGEN_ALLOC_ACTIVATE));
sgen_assert_memory_alloc (ptr, size, assert_description);
if (ptr) {
SGEN_ATOMIC_ADD_P (total_alloc, size);
if (flags & SGEN_ALLOC_HEAP)
MONO_GC_HEAP_ALLOC ((mword)ptr, size);
}
return ptr;
}
/* size must be a power of 2 */
static void*
mono_sgen_alloc_os_memory_aligned (size_t size, size_t alignment, gboolean activate)
{
return mono_valloc_aligned (size, alignment, prot_flags_for_activate (activate));
}
static void*
mono_sgen_alloc_os_memory (size_t size, int activate)
{
return mono_valloc (0, size, prot_flags_for_activate (activate));
}
