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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
static void nxt_buf_completion(nxt_task_t *task, void *obj, void *data);
void
nxt_buf_mem_init(nxt_buf_t *b, void *start, size_t size)
{
b->size = NXT_BUF_MEM_SIZE;
b->mem.start = start;
b->mem.pos = start;
b->mem.free = start;
b->mem.end = nxt_pointer_to(start, size);
}
nxt_buf_t *
nxt_buf_mem_alloc(nxt_mp_t *mp, size_t size, nxt_uint_t flags)
{
nxt_buf_t *b;
b = nxt_mp_zalloc(mp, NXT_BUF_MEM_SIZE);
if (nxt_slow_path(b == NULL)) {
return NULL;
}
b->data = mp;
b->completion_handler = nxt_buf_completion;
b->size = NXT_BUF_MEM_SIZE;
if (size != 0) {
b->mem.start = nxt_mp_alloc(mp, size);
if (nxt_slow_path(b->mem.start == NULL)) {
return NULL;
}
b->mem.pos = b->mem.start;
b->mem.free = b->mem.start;
b->mem.end = b->mem.start + size;
}
return b;
}
nxt_buf_t *
nxt_buf_file_alloc(nxt_mp_t *mp, size_t size, nxt_uint_t flags)
{
nxt_buf_t *b;
b = nxt_mp_zalloc(mp, NXT_BUF_FILE_SIZE);
if (nxt_slow_path(b == NULL)) {
return NULL;
}
b->data = mp;
b->completion_handler = nxt_buf_completion;
b->size = NXT_BUF_FILE_SIZE;
nxt_buf_set_file(b);
if (size != 0) {
b->mem.start = nxt_mp_alloc(mp, size);
if (nxt_slow_path(b->mem.start == NULL)) {
return NULL;
}
b->mem.pos = b->mem.start;
b->mem.free = b->mem.start;
b->mem.end = b->mem.start + size;
}
return b;
}
nxt_buf_t *
nxt_buf_mmap_alloc(nxt_mp_t *mp, size_t size)
{
nxt_buf_t *b;
b = nxt_mp_zalloc(mp, NXT_BUF_MMAP_SIZE);
if (nxt_fast_path(b != NULL)) {
b->data = mp;
b->completion_handler = nxt_buf_completion;
b->size = NXT_BUF_MMAP_SIZE;
nxt_buf_set_file(b);
nxt_buf_set_mmap(b);
nxt_buf_mem_set_size(&b->mem, size);
}
return b;
}
nxt_buf_t *
nxt_buf_sync_alloc(nxt_mp_t *mp, nxt_uint_t flags)
{
nxt_buf_t *b;
b = nxt_mp_zalloc(mp, NXT_BUF_SYNC_SIZE);
if (nxt_fast_path(b != NULL)) {
b->data = mp;
b->completion_handler = nxt_buf_completion;
b->size = NXT_BUF_SYNC_SIZE;
nxt_buf_set_sync(b);
b->is_nobuf = ((flags & NXT_BUF_SYNC_NOBUF) != 0);
b->is_flush = ((flags & NXT_BUF_SYNC_FLUSH) != 0);
b->is_last = ((flags & NXT_BUF_SYNC_LAST) != 0);
}
return b;
}
void
nxt_buf_chain_add(nxt_buf_t **head, nxt_buf_t *in)
{
nxt_buf_t *b, **prev;
prev = head;
for (b = *head; b != NULL; b = b->next) {
prev = &b->next;
}
*prev = in;
}
size_t
nxt_buf_chain_length(nxt_buf_t *b)
{
size_t length;
length = 0;
while (b != NULL) {
length += b->mem.free - b->mem.pos;
b = b->next;
}
return length;
}
static void
nxt_buf_completion(nxt_task_t *task, void *obj, void *data)
{
nxt_mp_t *mp;
nxt_buf_t *b, *parent;
b = obj;
parent = data;
nxt_debug(task, "buf completion: %p %p", b, b->mem.start);
mp = b->data;
nxt_buf_free(mp, b);
if (parent != NULL) {
nxt_debug(task, "parent retain:%uD", parent->retain);
parent->retain--;
if (parent->retain == 0) {
parent->mem.pos = parent->mem.free;
parent->completion_handler(task, parent, parent->parent);
}
}
}
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