void NRT_MemInfo_release(MemInfo *mi, int defer) {
NRT_Debug(nrt_debug_print("NRT_release %p refct=%zu\n", mi,
mi->payload.refct));
assert (mi->payload.refct > 0 && "RefCt cannot be 0");
/* RefCt drop to zero */
if (TheMSys.atomic_dec(&mi->payload.refct) == 0) {
NRT_MemInfo_call_dtor(mi, defer);
}
}
MemInfo* NRT_MemSys_pop_meminfo(void) {
MemInfo *node = nrt_pop_meminfo_list(&TheMSys.mi_freelist);
if (NULL == node) {
node = meminfo_malloc();
}
memset(node, 0, sizeof(MemInfo)); /* to catch bugs; not required */
NRT_Debug(nrt_debug_print("NRT_MemSys_pop_meminfo: return %p\n", node));
TheMSys.atomic_inc(&TheMSys.stats_mi_alloc);
return node;
}
static
void nrt_push_meminfo_list(MemInfo * volatile *list, MemInfo *repl) {
MemInfo *old, *head;
head = *list; /* get the current head */
do {
old = head; /* old is what CAS compare against */
/* Set the next item to be the current head */
repl->list_next = head;
/* Try to replace the head with the new node.
The function also perform:
head <- atomicload(list) */
} while ( !TheMSys.atomic_cas(list, old, repl, &head) );
}
void NRT_MemSys_insert_meminfo(MemInfo *newnode) {
assert(newnode && "`newnode` cannot be NULL");
/*
if (NULL == newnode) {
newnode = meminfo_malloc();
} else {
assert(newnode->payload.refct == 0 && "RefCt must be 0");
}
*/
assert(newnode->payload.refct == 0 && "RefCt must be 0");
NRT_Debug(nrt_debug_print("NRT_MemSys_insert_meminfo newnode=%p\n",
newnode));
memset(newnode, 0, sizeof(MemInfo)); /* to catch bugs; not required */
nrt_push_meminfo_list(&TheMSys.mi_freelist, newnode);
TheMSys.atomic_inc(&TheMSys.stats_mi_free);
}
static
MemInfo *nrt_pop_meminfo_list(MemInfo * volatile *list) {
MemInfo *old, *repl, *head;
head = *list; /* get the current head */
do {
old = head; /* old is what CAS compare against */
if ( head ) {
/* if head is not NULL, replace with the next item */
repl = head->list_next;
} else {
/* else, replace with NULL */
repl = NULL;
}
/* Try to replace list head with the next node.
The function also perform:
head <- atomicload(list) */
} while ( !TheMSys.atomic_cas(list, old, repl, &head));
return old;
}
void NRT_Free(void *ptr) {
NRT_Debug(nrt_debug_print("NRT_Free %p\n", ptr));
free(ptr);
TheMSys.atomic_inc(&TheMSys.stats_free);
}
void* NRT_Allocate(size_t size) {
void *ptr = malloc(size);
NRT_Debug(nrt_debug_print("NRT_Allocate bytes=%llu ptr=%p\n", size, ptr));
TheMSys.atomic_inc(&TheMSys.stats_alloc);
return ptr;
}
void NRT_MemInfo_acquire(MemInfo *mi) {
NRT_Debug(nrt_debug_print("NRT_acquire %p refct=%zu\n", mi,
mi->payload.refct));
assert(mi->payload.refct > 0 && "RefCt cannot be zero");
TheMSys.atomic_inc(&mi->payload.refct);
}
void NRT_MemInfo_acquire(MemInfo *mi) {
NRT_Debug(nrt_debug_print("NRT_acquire %p\n", mi));
TheMSys.atomic_inc(&mi->payload.refct);
}
