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[core] chunkqueue_small_resp_optim() comment

personal/stbuehler/tests-path
Glenn Strauss 2021-10-28 17:14:20 -04:00
parent 90f062cb07
commit e8eac0c2ad
1 changed files with 5 additions and 1 deletions
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6
src/chunk.c
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@ -1456,6 +1456,8 @@ void
chunkqueue_small_resp_optim (chunkqueue * const restrict cq)
{
/*(caller must verify response is small (and non-empty) before calling)*/
/*(caller must verify first chunk is MEM_CHUNK, i.e. response headers)*/
/*(caller must verify response is non-zero length)*/
/*(optimization to use fewer syscalls to send a small response by reading
* small files into memory, thereby avoiding use of sendfile() and multiple
@ -1463,6 +1465,8 @@ chunkqueue_small_resp_optim (chunkqueue * const restrict cq)
*(If TLS, then will shortly need to be in memory for encryption anyway)*/
/*assert(cq->first);*/
/*assert(cq->first->type == MEM_CHUNK);*/
/*assert(cq->first->next);*/
chunk * restrict c = cq->first;
chunk * const restrict filec = c->next; /*(require file already be open)*/
if (filec != cq->last || filec->type != FILE_CHUNK || filec->file.fd < 0)
@ -1476,7 +1480,7 @@ chunkqueue_small_resp_optim (chunkqueue * const restrict cq)
* so cq->bytes_in and cq->bytes_out should not be modified */
off_t len = filec->file.length - filec->offset;
if (c->type != MEM_CHUNK || (size_t)len > buffer_string_space(c->mem)) {
if ((size_t)len > buffer_string_space(c->mem)) {
c->next = chunk_acquire((size_t)len+1);
c = c->next;
/*c->next = filec;*/