qemu/qapi/qmp-registry.c
Kevin Wolf 9ce44e2ce2 qmp: Move dispatcher to a coroutine
This moves the QMP dispatcher to a coroutine and runs all QMP command
handlers that declare 'coroutine': true in coroutine context so they
can avoid blocking the main loop while doing I/O or waiting for other
events.

For commands that are not declared safe to run in a coroutine, the
dispatcher drops out of coroutine context by calling the QMP command
handler from a bottom half.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201005155855.256490-10-kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2020-10-09 07:08:20 +02:00

92 lines
2.1 KiB
C

/*
* Core Definitions for QAPI/QMP Dispatch
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Michael Roth <mdroth@us.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qapi/qmp/dispatch.h"
void qmp_register_command(QmpCommandList *cmds, const char *name,
QmpCommandFunc *fn, QmpCommandOptions options)
{
QmpCommand *cmd = g_malloc0(sizeof(*cmd));
/* QCO_COROUTINE and QCO_ALLOW_OOB are incompatible for now */
assert(!((options & QCO_COROUTINE) && (options & QCO_ALLOW_OOB)));
cmd->name = name;
cmd->fn = fn;
cmd->enabled = true;
cmd->options = options;
QTAILQ_INSERT_TAIL(cmds, cmd, node);
}
const QmpCommand *qmp_find_command(const QmpCommandList *cmds, const char *name)
{
QmpCommand *cmd;
QTAILQ_FOREACH(cmd, cmds, node) {
if (strcmp(cmd->name, name) == 0) {
return cmd;
}
}
return NULL;
}
static void qmp_toggle_command(QmpCommandList *cmds, const char *name,
bool enabled)
{
QmpCommand *cmd;
QTAILQ_FOREACH(cmd, cmds, node) {
if (strcmp(cmd->name, name) == 0) {
cmd->enabled = enabled;
return;
}
}
}
void qmp_disable_command(QmpCommandList *cmds, const char *name)
{
qmp_toggle_command(cmds, name, false);
}
void qmp_enable_command(QmpCommandList *cmds, const char *name)
{
qmp_toggle_command(cmds, name, true);
}
bool qmp_command_is_enabled(const QmpCommand *cmd)
{
return cmd->enabled;
}
const char *qmp_command_name(const QmpCommand *cmd)
{
return cmd->name;
}
bool qmp_has_success_response(const QmpCommand *cmd)
{
return !(cmd->options & QCO_NO_SUCCESS_RESP);
}
void qmp_for_each_command(const QmpCommandList *cmds, qmp_cmd_callback_fn fn,
void *opaque)
{
const QmpCommand *cmd;
QTAILQ_FOREACH(cmd, cmds, node) {
fn(cmd, opaque);
}
}