void *io_loop_return;
+#ifdef DEBUG
+/* Set to skip the next plan. */
+bool io_plan_nodebug;
+/* The current connection to apply plan to. */
+struct io_conn *current;
+/* User-defined function to select which connection(s) to debug. */
+bool (*io_debug_conn)(struct io_conn *conn);
+/* Set when we wake up an connection we are debugging. */
+bool io_debug_wakeup;
+
+struct io_plan io_debug(struct io_plan plan)
+{
+ if (io_plan_nodebug) {
+ io_plan_nodebug = false;
+ return plan;
+ }
+
+ if (!io_debug_conn || !current)
+ return plan;
+
+ if (!io_debug_conn(current) && !io_debug_wakeup)
+ return plan;
+
+ io_debug_wakeup = false;
+ current->plan = plan;
+ backend_plan_changed(current);
+
+ /* Call back into the loop immediately. */
+ io_loop_return = io_loop();
+ return plan;
+}
+
+static void debug_io_wake(struct io_conn *conn)
+{
+ /* We want linear if we wake a debugged connection, too. */
+ if (io_debug_conn && io_debug_conn(conn))
+ io_debug_wakeup = true;
+}
+
+/* Counterpart to io_plan_no_debug(), called in macros in io.h */
+static void io_plan_debug_again(void)
+{
+ io_plan_nodebug = false;
+}
+#else
+static void debug_io_wake(struct io_conn *conn)
+{
+}
+static void io_plan_debug_again(void)
+{
+}
+#endif
+
struct io_listener *io_new_listener_(int fd,
- struct io_plan (*start)(struct io_conn *,
- void *arg),
- void (*finish)(struct io_conn *, void *),
+ void (*init)(int fd, void *arg),
void *arg)
{
struct io_listener *l = malloc(sizeof(*l));
l->fd.listener = true;
l->fd.fd = fd;
- l->next = start;
- l->finish = finish;
- l->conn_arg = arg;
+ l->init = init;
+ l->arg = arg;
if (!add_listener(l)) {
free(l);
return NULL;
free(l);
}
-struct io_conn *io_new_conn_(int fd,
- struct io_plan (*start)(struct io_conn *, void *),
- void (*finish)(struct io_conn *, void *),
- void *arg)
+struct io_conn *io_new_conn_(int fd, struct io_plan plan)
{
struct io_conn *conn = malloc(sizeof(*conn));
+ io_plan_debug_again();
+
if (!conn)
return NULL;
conn->fd.listener = false;
conn->fd.fd = fd;
- conn->plan.next = start;
- conn->finish = finish;
- conn->finish_arg = conn->plan.next_arg = arg;
- conn->plan.pollflag = 0;
- conn->plan.state = IO_NEXT;
+ conn->plan = plan;
+ conn->finish = NULL;
+ conn->finish_arg = NULL;
conn->duplex = NULL;
conn->timeout = NULL;
if (!add_conn(conn)) {
return conn;
}
-struct io_conn *io_duplex_(struct io_conn *old,
- struct io_plan (*start)(struct io_conn *, void *),
- void (*finish)(struct io_conn *, void *),
- void *arg)
+void io_set_finish_(struct io_conn *conn,
+ void (*finish)(struct io_conn *, void *),
+ void *arg)
+{
+ conn->finish = finish;
+ conn->finish_arg = arg;
+}
+
+struct io_conn *io_duplex_(struct io_conn *old, struct io_plan plan)
{
struct io_conn *conn;
+ io_plan_debug_again();
+
assert(!old->duplex);
conn = malloc(sizeof(*conn));
conn->fd.listener = false;
conn->fd.fd = old->fd.fd;
- conn->plan.next = start;
- conn->finish = finish;
- conn->finish_arg = conn->plan.next_arg = arg;
- conn->plan.pollflag = 0;
- conn->plan.state = IO_NEXT;
+ conn->plan = plan;
conn->duplex = old;
+ conn->finish = NULL;
+ conn->finish_arg = NULL;
conn->timeout = NULL;
if (!add_duplex(conn)) {
free(conn);
bool io_timeout_(struct io_conn *conn, struct timespec ts,
struct io_plan (*cb)(struct io_conn *, void *), void *arg)
{
+ assert(cb);
+
if (!conn->timeout) {
conn->timeout = malloc(sizeof(*conn->timeout));
if (!conn->timeout)
return true;
}
-static enum io_result do_write(struct io_conn *conn)
+/* Returns true if we're finished. */
+static int do_write(int fd, struct io_plan *plan)
{
- ssize_t ret = write(conn->fd.fd, conn->plan.u.write.buf, conn->plan.u.write.len);
+ ssize_t ret = write(fd, plan->u.write.buf, plan->u.write.len);
if (ret < 0)
- return RESULT_CLOSE;
-
- conn->plan.u.write.buf += ret;
- conn->plan.u.write.len -= ret;
- if (conn->plan.u.write.len == 0)
- return RESULT_FINISHED;
- else
- return RESULT_AGAIN;
+ return -1;
+
+ plan->u.write.buf += ret;
+ plan->u.write.len -= ret;
+ return (plan->u.write.len == 0);
}
/* Queue some data to be written. */
-struct io_plan io_write_(struct io_conn *conn, const void *data, size_t len,
+struct io_plan io_write_(const void *data, size_t len,
struct io_plan (*cb)(struct io_conn *, void *),
void *arg)
{
struct io_plan plan;
+ assert(cb);
plan.u.write.buf = data;
plan.u.write.len = len;
plan.io = do_write;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLOUT;
- plan.state = IO_IO;
+
return plan;
}
-static enum io_result do_read(struct io_conn *conn)
+static int do_read(int fd, struct io_plan *plan)
{
- ssize_t ret = read(conn->fd.fd, conn->plan.u.read.buf,
- conn->plan.u.read.len);
+ ssize_t ret = read(fd, plan->u.read.buf, plan->u.read.len);
if (ret <= 0)
- return RESULT_CLOSE;
- conn->plan.u.read.buf += ret;
- conn->plan.u.read.len -= ret;
- if (conn->plan.u.read.len == 0)
- return RESULT_FINISHED;
- else
- return RESULT_AGAIN;
+ return -1;
+
+ plan->u.read.buf += ret;
+ plan->u.read.len -= ret;
+ return (plan->u.read.len == 0);
}
/* Queue a request to read into a buffer. */
-struct io_plan io_read_(struct io_conn *conn, void *data, size_t len,
+struct io_plan io_read_(void *data, size_t len,
struct io_plan (*cb)(struct io_conn *, void *),
void *arg)
{
struct io_plan plan;
+ assert(cb);
plan.u.read.buf = data;
plan.u.read.len = len;
plan.io = do_read;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLIN;
- plan.state = IO_IO;
+
return plan;
}
-static enum io_result do_read_partial(struct io_conn *conn)
+static int do_read_partial(int fd, struct io_plan *plan)
{
- ssize_t ret = read(conn->fd.fd, conn->plan.u.readpart.buf,
- *conn->plan.u.readpart.lenp);
+ ssize_t ret = read(fd, plan->u.readpart.buf, *plan->u.readpart.lenp);
if (ret <= 0)
- return RESULT_CLOSE;
- *conn->plan.u.readpart.lenp = ret;
- return RESULT_FINISHED;
+ return -1;
+
+ *plan->u.readpart.lenp = ret;
+ return 1;
}
/* Queue a partial request to read into a buffer. */
-struct io_plan io_read_partial_(struct io_conn *conn, void *data, size_t *len,
+struct io_plan io_read_partial_(void *data, size_t *len,
struct io_plan (*cb)(struct io_conn *, void *),
void *arg)
{
struct io_plan plan;
+ assert(cb);
plan.u.readpart.buf = data;
plan.u.readpart.lenp = len;
plan.io = do_read_partial;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLIN;
- plan.state = IO_IO;
return plan;
}
-static enum io_result do_write_partial(struct io_conn *conn)
+static int do_write_partial(int fd, struct io_plan *plan)
{
- ssize_t ret = write(conn->fd.fd, conn->plan.u.writepart.buf,
- *conn->plan.u.writepart.lenp);
+ ssize_t ret = write(fd, plan->u.writepart.buf, *plan->u.writepart.lenp);
if (ret < 0)
- return RESULT_CLOSE;
- *conn->plan.u.writepart.lenp = ret;
- return RESULT_FINISHED;
+ return -1;
+
+ *plan->u.writepart.lenp = ret;
+ return 1;
}
/* Queue a partial write request. */
-struct io_plan io_write_partial_(struct io_conn *conn,
- const void *data, size_t *len,
+struct io_plan io_write_partial_(const void *data, size_t *len,
struct io_plan (*cb)(struct io_conn*, void *),
void *arg)
{
struct io_plan plan;
+ assert(cb);
plan.u.writepart.buf = data;
plan.u.writepart.lenp = len;
plan.io = do_write_partial;
plan.next = cb;
plan.next_arg = arg;
plan.pollflag = POLLOUT;
- plan.state = IO_IO;
return plan;
}
-struct io_plan io_idle(struct io_conn *conn)
+struct io_plan io_idle_(void)
{
struct io_plan plan;
plan.pollflag = 0;
- plan.state = IO_IDLE;
+ plan.io = NULL;
+ /* Never called (overridden by io_wake), but NULL means closing */
+ plan.next = (void *)io_idle_;
return plan;
}
-void io_wake_(struct io_conn *conn,
- struct io_plan (*fn)(struct io_conn *, void *), void *arg)
+void io_wake_(struct io_conn *conn, struct io_plan plan)
{
- /* It might have finished, but we haven't called its finish() yet. */
- if (conn->plan.state == IO_FINISHED)
+ io_plan_debug_again();
+
+ /* It might be closing, but we haven't called its finish() yet. */
+ if (!conn->plan.next)
return;
- assert(conn->plan.state == IO_IDLE);
- conn->plan.next = fn;
- conn->plan.next_arg = arg;
- conn->plan.pollflag = 0;
- conn->plan.state = IO_NEXT;
- backend_wakeup(conn);
-}
+ /* It was idle, right? */
+ assert(!conn->plan.io);
+ conn->plan = plan;
+ backend_plan_changed(conn);
-static struct io_plan do_next(struct io_conn *conn)
-{
- if (timeout_active(conn))
- backend_del_timeout(conn);
- return conn->plan.next(conn, conn->plan.next_arg);
+ debug_io_wake(conn);
}
-struct io_plan do_ready(struct io_conn *conn)
+void io_ready(struct io_conn *conn)
{
- assert(conn->plan.state == IO_IO);
- switch (conn->plan.io(conn)) {
- case RESULT_CLOSE:
- return io_close(conn, NULL);
- case RESULT_FINISHED:
- return do_next(conn);
- case RESULT_AGAIN:
- return conn->plan;
- default:
- abort();
+ switch (conn->plan.io(conn->fd.fd, &conn->plan)) {
+ case -1: /* Failure means a new plan: close up. */
+ set_current(conn);
+ conn->plan = io_close();
+ backend_plan_changed(conn);
+ set_current(NULL);
+ break;
+ case 0: /* Keep going with plan. */
+ break;
+ case 1: /* Done: get next plan. */
+ set_current(conn);
+ if (timeout_active(conn))
+ backend_del_timeout(conn);
+ conn->plan = conn->plan.next(conn, conn->plan.next_arg);
+ backend_plan_changed(conn);
+ set_current(NULL);
}
}
-/* Useful next functions. */
/* Close the connection, we're done. */
-struct io_plan io_close(struct io_conn *conn, void *arg)
+struct io_plan io_close_(void)
{
struct io_plan plan;
- plan.state = IO_FINISHED;
plan.pollflag = 0;
+ /* This means we're closing. */
+ plan.next = NULL;
+ plan.u.close.saved_errno = errno;
return plan;
}
+struct io_plan io_close_cb(struct io_conn *conn, void *arg)
+{
+ return io_close();
+}
+
/* Exit the loop, returning this (non-NULL) arg. */
-struct io_plan io_break_(struct io_conn *conn, void *ret,
- struct io_plan (*fn)(struct io_conn *, void *),
- void *arg)
+struct io_plan io_break_(void *ret, struct io_plan plan)
{
- struct io_plan plan;
+ io_plan_debug_again();
+ assert(ret);
io_loop_return = ret;
- plan.state = IO_NEXT;
- plan.pollflag = 0;
- plan.next = fn;
- plan.next_arg = arg;
-
return plan;
}