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ustream: prevent recursive calls to the read callback

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Simplifies stacked ustreams and calling poll from the read function.
Reuse an unused leftover struct member in order to not break ABI.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2024-03-29 10:23:28 +01:00
parent 12bda4bdb1
commit eb9bcb6418
2 changed files with 12 additions and 5 deletions
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14
ustream.c
View file

@ -24,6 +24,8 @@
#include "ustream.h"
#define CB_PENDING_READ (1 << 0)
static void ustream_init_buf(struct ustream_buf *buf, int len)
{
if (!len)
@ -133,7 +135,6 @@ void ustream_init_defaults(struct ustream *s)
s->state_change.cb = ustream_state_change_cb;
s->write_error = false;
s->eof = false;
s->eof_write_done = false;
s->read_blocked = 0;
s->r.buffers = 0;
@ -301,7 +302,6 @@ char *ustream_reserve(struct ustream *s, int len, int *maxlen)
void ustream_fill_read(struct ustream *s, int len)
{
struct ustream_buf *buf = s->r.data_tail;
int n = len;
int maxlen;
s->r.data_bytes += len;
@ -321,8 +321,14 @@ void ustream_fill_read(struct ustream *s, int len)
buf = buf->next;
} while (len);
if (s->notify_read)
s->notify_read(s, n);
if (s->notify_read) {
if (s->pending_cb & CB_PENDING_READ)
return;
s->pending_cb |= CB_PENDING_READ;
s->notify_read(s, s->r.data_bytes);
s->pending_cb &= ~CB_PENDING_READ;
}
}
char *ustream_get_read_buf(struct ustream *s, int *buflen)

3
ustream.h
View file

@ -114,7 +114,8 @@ struct ustream {
*/
bool string_data;
bool write_error;
bool eof, eof_write_done;
bool eof;
uint8_t pending_cb;
enum read_blocked_reason read_blocked;
};