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mpv/options/m_config_core.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "common/common.h"
#include "common/global.h"
#include "common/msg_control.h"
#include "common/msg.h"
#include "m_config_core.h"
#include "misc/dispatch.h"
#include "options/m_option.h"
#include "osdep/threads.h"
// For use with m_config_cache.
struct m_config_shadow {
mp_mutex lock;
// Incremented on every option change.
_Atomic uint64_t ts;
// -- immutable after init
// List of m_sub_options instances.
// Index 0 is the top-level and is always present.
// Immutable after init.
// Invariant: a parent is always at a lower index than any of its children.
struct m_config_group *groups;
int num_groups;
// -- protected by lock
struct m_config_data *data; // protected shadow copy of the option data
struct config_cache **listeners;
int num_listeners;
};
// Represents a sub-struct (OPT_SUBSTRUCT()).
struct m_config_group {
const struct m_sub_options *group;
int opt_count; // cached opt. count; group->opts[opt_count].name==NULL
int group_count; // 1 + number of all sub groups owned by this (so
// m_config_shadow.groups[idx..idx+group_count] is used
// by the entire tree of sub groups included by this
// group)
int parent_group; // index of parent group into m_config_shadow.groups[],
// or -1 for group 0
int parent_ptr; // ptr offset in the parent group's data, or -1 if
// none
const char *prefix; // concat_name(_, prefix, opt->name) => full name
// (the parent names are already included in this)
};
// A copy of option data. Used for the main option struct, the shadow data,
// and copies for m_config_cache.
struct m_config_data {
struct m_config_shadow *shadow; // option definitions etc., main data copy
int group_index; // start index into m_config.groups[]
struct m_group_data *gdata; // user struct allocation (our copy of data)
int num_gdata; // (group_index+num_gdata = end index)
};
struct config_cache {
struct m_config_cache *public;
struct m_config_data *data; // public data
struct m_config_data *src; // global data (currently ==shadow->data)
struct m_config_shadow *shadow; // global metadata
int group_start, group_end; // derived from data->group_index etc.
uint64_t ts; // timestamp of this data copy
bool in_list; // part of m_config_shadow->listeners[]
int upd_group; // for "incremental" change notification
int upd_opt;
// --- Implicitly synchronized by setting/unsetting wakeup_cb.
struct mp_dispatch_queue *wakeup_dispatch_queue;
void (*wakeup_dispatch_cb)(void *ctx);
void *wakeup_dispatch_cb_ctx;
// --- Protected by shadow->lock
void (*wakeup_cb)(void *ctx);
void *wakeup_cb_ctx;
};
struct force_update {
char *name;
uint64_t ts;
};
// Per m_config_data state for each m_config_group.
struct m_group_data {
char *udata; // pointer to group user option struct
uint64_t ts; // timestamp of the data copy
struct force_update **force_update; // tracks opts that are written with force update
int force_update_len;
};
static void add_sub_group(struct m_config_shadow *shadow, const char *name_prefix,
int parent_group_index, int parent_ptr,
const struct m_sub_options *subopts);
static struct m_group_data *m_config_gdata(struct m_config_data *data,
int group_index)
{
if (group_index < data->group_index ||
group_index >= data->group_index + data->num_gdata)
return NULL;
return &data->gdata[group_index - data->group_index];
}
// Like concat_name(), but returns either a, b, or buf. buf/buf_size is used as
// target for snprintf(). (buf_size is recommended to be MAX_OPT_NAME_LEN.)
static const char *concat_name_buf(char *buf, size_t buf_size,
const char *a, const char *b)
{
assert(a);
assert(b);
if (!a[0])
return b;
if (!b[0])
return a;
snprintf(buf, buf_size, "%s-%s", a, b);
return buf;
}
// Return full option name from prefix (a) and option name (b). Returns either
// a, b, or a talloc'ed string under ta_parent.
static const char *concat_name(void *ta_parent, const char *a, const char *b)
{
char buf[M_CONFIG_MAX_OPT_NAME_LEN];
const char *r = concat_name_buf(buf, sizeof(buf), a, b);
return r == buf ? talloc_strdup(ta_parent, r) : r;
}
static bool iter_next(struct m_config_shadow *shadow, int group_start,
int group_end, int32_t *p_id)
{
int32_t id = *p_id;
int group_index = id == -1 ? group_start : id >> 16;
int opt_index = id == -1 ? -1 : id & 0xFFFF;
assert(group_index >= group_start && group_index <= group_end);
while (1) {
if (group_index >= group_end)
return false;
struct m_config_group *g = &shadow->groups[group_index];
const struct m_option *opts = g->group->opts;
assert(opt_index >= -1 && opt_index < g->opt_count);
opt_index += 1;
if (!opts || !opts[opt_index].name) {
group_index += 1;
opt_index = -1;
continue;
}
if (opts[opt_index].type == &m_option_type_subconfig)
continue;
*p_id = (group_index << 16) | opt_index;
return true;
}
}
bool m_config_shadow_get_next_opt(struct m_config_shadow *shadow, int32_t *p_id)
{
return iter_next(shadow, 0, shadow->num_groups, p_id);
}
bool m_config_cache_get_next_opt(struct m_config_cache *cache, int32_t *p_id)
{
return iter_next(cache->shadow, cache->internal->group_start,
cache->internal->group_end, p_id);
}
static void get_opt_from_id(struct m_config_shadow *shadow, int32_t id,
int *out_group_index, int *out_opt_index)
{
int group_index = id >> 16;
int opt_index = id & 0xFFFF;
assert(group_index >= 0 && group_index < shadow->num_groups);
assert(opt_index >= 0 && opt_index < shadow->groups[group_index].opt_count);
*out_group_index = group_index;
*out_opt_index = opt_index;
}
const struct m_option *m_config_shadow_get_opt(struct m_config_shadow *shadow,
int32_t id)
{
int group_index, opt_index;
get_opt_from_id(shadow, id, &group_index, &opt_index);
return &shadow->groups[group_index].group->opts[opt_index];
}
const char *m_config_shadow_get_opt_name(struct m_config_shadow *shadow,
int32_t id, char *buf, size_t buf_size)
{
int group_index, opt_index;
get_opt_from_id(shadow, id, &group_index, &opt_index);
struct m_config_group *g = &shadow->groups[group_index];
return concat_name_buf(buf, buf_size, g->prefix,
g->group->opts[opt_index].name);
}
const void *m_config_shadow_get_opt_default(struct m_config_shadow *shadow,
int32_t id)
{
int group_index, opt_index;
get_opt_from_id(shadow, id, &group_index, &opt_index);
const struct m_sub_options *subopt = shadow->groups[group_index].group;
const struct m_option *opt = &subopt->opts[opt_index];
if (opt->offset < 0)
return NULL;
if (opt->defval)
return opt->defval;
if (subopt->defaults)
return (char *)subopt->defaults + opt->offset;
return &m_option_value_default;
}
void *m_config_cache_get_opt_data(struct m_config_cache *cache, int32_t id)
{
int group_index, opt_index;
get_opt_from_id(cache->shadow, id, &group_index, &opt_index);
assert(group_index >= cache->internal->group_start &&
group_index < cache->internal->group_end);
struct m_group_data *gd = m_config_gdata(cache->internal->data, group_index);
const struct m_option *opt =
&cache->shadow->groups[group_index].group->opts[opt_index];
return gd && opt->offset >= 0 ? gd->udata + opt->offset : NULL;
}
static uint64_t get_opt_change_mask(struct m_config_shadow *shadow, int group_index,
int group_root, const struct m_option *opt)
{
uint64_t changed = opt->flags & UPDATE_OPTS_MASK;
while (group_index != group_root) {
struct m_config_group *g = &shadow->groups[group_index];
changed |= g->group->change_flags;
group_index = g->parent_group;
}
return changed;
}
uint64_t m_config_cache_get_option_change_mask(struct m_config_cache *cache,
int32_t id)
{
struct m_config_shadow *shadow = cache->shadow;
int group_index, opt_index;
get_opt_from_id(shadow, id, &group_index, &opt_index);
assert(group_index >= cache->internal->group_start &&
group_index < cache->internal->group_end);
return get_opt_change_mask(cache->shadow, group_index,
cache->internal->data->group_index,
&shadow->groups[group_index].group->opts[opt_index]);
}
// The memcpys are supposed to work around the strict aliasing violation,
// that would result if we just dereferenced a void** (where the void** is
// actually casted from struct some_type* ). The dummy struct type is in
// theory needed, because void* and struct pointers could have different
// representations, while pointers to different struct types don't.
static void *substruct_read_ptr(const void *ptr)
{
struct mp_dummy_ *res;
memcpy(&res, ptr, sizeof(res));
return res;
}
static void substruct_write_ptr(void *ptr, void *val)
{
struct mp_dummy_ *src = val;
memcpy(ptr, &src, sizeof(src));
}
// Initialize a field with a given value. In case this is dynamic data, it has
// to be allocated and copied. src can alias dst.
static void init_opt_inplace(const struct m_option *opt, void *dst,
const void *src)
{
// The option will use dynamic memory allocation iff it has a free callback.
if (opt->type->free) {
union m_option_value temp;
memcpy(&temp, src, opt->type->size);
memset(dst, 0, opt->type->size);
m_option_copy(opt, dst, &temp);
} else if (src != dst) {
memcpy(dst, src, opt->type->size);
}
}
static void alloc_group(struct m_config_data *data, int group_index,
struct m_config_data *copy)
{
assert(group_index == data->group_index + data->num_gdata);
assert(group_index < data->shadow->num_groups);
struct m_config_group *group = &data->shadow->groups[group_index];
const struct m_sub_options *opts = group->group;
MP_TARRAY_GROW(data, data->gdata, data->num_gdata);
struct m_group_data *gdata = &data->gdata[data->num_gdata++];
struct m_group_data *copy_gdata =
copy ? m_config_gdata(copy, group_index) : NULL;
*gdata = (struct m_group_data){
.udata = talloc_zero_size(data, opts->size),
.ts = copy_gdata ? copy_gdata->ts : 0,
};
if (opts->defaults)
memcpy(gdata->udata, opts->defaults, opts->size);
char *copy_src = copy_gdata ? copy_gdata->udata : NULL;
for (int n = 0; opts->opts && opts->opts[n].name; n++) {
const struct m_option *opt = &opts->opts[n];
if (opt->offset < 0 || opt->type->size == 0)
continue;
void *dst = gdata->udata + opt->offset;
const void *defptr = opt->defval ? opt->defval : dst;
if (copy_src)
defptr = copy_src + opt->offset;
init_opt_inplace(opt, dst, defptr);
}
// If there's a parent, update its pointer to the new struct.
if (group->parent_group >= data->group_index && group->parent_ptr >= 0) {
struct m_group_data *parent_gdata =
m_config_gdata(data, group->parent_group);
assert(parent_gdata);
substruct_write_ptr(parent_gdata->udata + group->parent_ptr, gdata->udata);
}
}
static void free_option_data(void *p)
{
struct m_config_data *data = p;
for (int i = 0; i < data->num_gdata; i++) {
struct m_group_data *gdata = &data->gdata[i];
struct m_config_group *group =
&data->shadow->groups[data->group_index + i];
const struct m_option *opts = group->group->opts;
for (int n = 0; opts && opts[n].name; n++) {
const struct m_option *opt = &opts[n];
if (opt->offset >= 0 && opt->type->size > 0)
m_option_free(opt, gdata->udata + opt->offset);
}
}
}
// Allocate data using the option description in shadow, starting at group_index
// (index into m_config.groups[]).
// If copy is not NULL, copy all data from there (for groups which are in both
// m_config_data instances), in all other cases init the data with the defaults.
static struct m_config_data *allocate_option_data(void *ta_parent,
struct m_config_shadow *shadow,
int group_index,
struct m_config_data *copy)
{
assert(group_index >= 0 && group_index < shadow->num_groups);
struct m_config_data *data = talloc_zero(ta_parent, struct m_config_data);
talloc_set_destructor(data, free_option_data);
data->shadow = shadow;
data->group_index = group_index;
struct m_config_group *root_group = &shadow->groups[group_index];
assert(root_group->group_count > 0);
for (int n = group_index; n < group_index + root_group->group_count; n++)
alloc_group(data, n, copy);
return data;
}
static void shadow_destroy(void *p)
{
struct m_config_shadow *shadow = p;
// must all have been unregistered
assert(shadow->num_listeners == 0);
talloc_free(shadow->data);
mp_mutex_destroy(&shadow->lock);
}
struct m_config_shadow *m_config_shadow_new(const struct m_sub_options *root)
{
struct m_config_shadow *shadow = talloc_zero(NULL, struct m_config_shadow);
talloc_set_destructor(shadow, shadow_destroy);
mp_mutex_init(&shadow->lock);
add_sub_group(shadow, NULL, -1, -1, root);
if (!root->size)
return shadow;
shadow->data = allocate_option_data(shadow, shadow, 0, NULL);
return shadow;
}
static void init_obj_settings_list(struct m_config_shadow *shadow,
int parent_group_index,
const struct m_obj_list *list)
{
struct m_obj_desc desc;
for (int n = 0; ; n++) {
if (!list->get_desc(&desc, n))
break;
if (desc.global_opts) {
add_sub_group(shadow, NULL, parent_group_index, -1,
desc.global_opts);
}
if (list->use_global_options && desc.options) {
struct m_sub_options *conf = talloc_ptrtype(shadow, conf);
*conf = (struct m_sub_options){
.prefix = desc.options_prefix,
.opts = desc.options,
.defaults = desc.priv_defaults,
.size = desc.priv_size,
};
add_sub_group(shadow, NULL, parent_group_index, -1, conf);
}
}
}
static void add_sub_group(struct m_config_shadow *shadow, const char *name_prefix,
int parent_group_index, int parent_ptr,
const struct m_sub_options *subopts)
{
// Can't be used multiple times.
for (int n = 0; n < shadow->num_groups; n++)
assert(shadow->groups[n].group != subopts);
if (!name_prefix)
name_prefix = "";
if (subopts->prefix && subopts->prefix[0]) {
assert(!name_prefix[0]);
name_prefix = subopts->prefix;
}
// You can only use UPDATE_ flags here.
assert(!(subopts->change_flags & ~(unsigned)UPDATE_OPTS_MASK));
assert(parent_group_index >= -1 && parent_group_index < shadow->num_groups);
int group_index = shadow->num_groups++;
MP_TARRAY_GROW(shadow, shadow->groups, group_index);
shadow->groups[group_index] = (struct m_config_group){
.group = subopts,
.parent_group = parent_group_index,
.parent_ptr = parent_ptr,
.prefix = name_prefix,
};
for (int i = 0; subopts->opts && subopts->opts[i].name; i++) {
const struct m_option *opt = &subopts->opts[i];
if (opt->type == &m_option_type_subconfig) {
const struct m_sub_options *new_subopts = opt->priv;
// Providing default structs in-place is not allowed.
if (opt->offset >= 0 && subopts->defaults) {
void *ptr = (char *)subopts->defaults + opt->offset;
assert(!substruct_read_ptr(ptr));
}
const char *prefix = concat_name(shadow, name_prefix, opt->name);
add_sub_group(shadow, prefix, group_index, opt->offset, new_subopts);
} else if (opt->type == &m_option_type_obj_settings_list) {
const struct m_obj_list *objlist = opt->priv;
init_obj_settings_list(shadow, group_index, objlist);
}
shadow->groups[group_index].opt_count = i + 1;
}
if (subopts->get_sub_options) {
for (int i = 0; ; i++) {
const struct m_sub_options *sub = NULL;
if (!subopts->get_sub_options(i, &sub))
break;
if (sub)
add_sub_group(shadow, NULL, group_index, -1, sub);
}
}
shadow->groups[group_index].group_count = shadow->num_groups - group_index;
}
static void cache_destroy(void *p)
{
struct m_config_cache *cache = p;
// (technically speaking, being able to call them both without anything
// breaking is a feature provided by these functions)
m_config_cache_set_wakeup_cb(cache, NULL, NULL);
m_config_cache_set_dispatch_change_cb(cache, NULL, NULL, NULL);
}
struct m_config_cache *m_config_cache_from_shadow(void *ta_parent,
struct m_config_shadow *shadow,
const struct m_sub_options *group)
{
int group_index = -1;
for (int n = 0; n < shadow->num_groups; n++) {
if (shadow->groups[n].group == group) {
group_index = n;
break;
}
}
assert(group_index >= 0); // invalid group (or not in option tree)
struct cache_alloc {
struct m_config_cache a;
struct config_cache b;
};
struct cache_alloc *alloc = talloc_zero(ta_parent, struct cache_alloc);
assert((void *)&alloc->a == (void *)alloc);
struct m_config_cache *cache = &alloc->a;
talloc_set_destructor(cache, cache_destroy);
cache->internal = &alloc->b;
cache->shadow = shadow;
struct config_cache *in = cache->internal;
in->shadow = shadow;
in->src = shadow->data;
mp_mutex_lock(&shadow->lock);
in->data = allocate_option_data(cache, shadow, group_index, in->src);
mp_mutex_unlock(&shadow->lock);
cache->opts = in->data->gdata[0].udata;
in->group_start = in->data->group_index;
in->group_end = in->group_start + in->data->num_gdata;
assert(shadow->groups[in->group_start].group_count == in->data->num_gdata);
in->upd_group = -1;
return cache;
}
struct m_config_cache *m_config_cache_alloc(void *ta_parent,
struct mpv_global *global,
const struct m_sub_options *group)
{
return m_config_cache_from_shadow(ta_parent, global->config, group);
}
static void append_force_update(struct m_config_cache *cache, struct m_group_data *gdata,
const char *opt_name)
{
for (int i = 0; i < gdata->force_update_len; ++i) {
if (strcmp(opt_name, gdata->force_update[i]->name) == 0) {
gdata->force_update[i]->ts = gdata->ts;
return;
}
}
struct force_update *new_update = talloc_zero(cache, struct force_update);
new_update->name = talloc_strdup(cache, opt_name);
new_update->ts = gdata->ts;
MP_TARRAY_APPEND(cache, gdata->force_update, gdata->force_update_len, new_update);
}
static bool check_force_update(struct m_group_data *gdata, const char *opt_name,
uint64_t timestamp)
{
for (int i = 0; i < gdata->force_update_len; ++i) {
if ((strcmp(opt_name, gdata->force_update[i]->name) == 0) &&
gdata->force_update[i]->ts == timestamp)
{
return true;
}
}
return false;
}
static void update_next_option(struct m_config_cache *cache, void **p_opt)
{
struct config_cache *in = cache->internal;
struct m_config_data *dst = in->data;
struct m_config_data *src = in->src;
assert(src->group_index == 0); // must be the option root currently
*p_opt = NULL;
while (in->upd_group < dst->group_index + dst->num_gdata) {
struct m_group_data *gsrc = m_config_gdata(src, in->upd_group);
struct m_group_data *gdst = m_config_gdata(dst, in->upd_group);
assert(gsrc && gdst);
if (gdst->ts < gsrc->ts) {
struct m_config_group *g = &dst->shadow->groups[in->upd_group];
const struct m_option *opts = g->group->opts;
while (opts && opts[in->upd_opt].name) {
const struct m_option *opt = &opts[in->upd_opt];
void *dsrc = gsrc->udata + opt->offset;
void *ddst = gdst->udata + opt->offset;
if (opt->offset >= 0 && opt->type->size) {
bool opt_equal = m_option_equal(opt, ddst, dsrc);
bool force_update = opt->force_update &&
check_force_update(gsrc, opt->name, in->ts);
if (!opt_equal || force_update) {
uint64_t ch = get_opt_change_mask(dst->shadow,
in->upd_group, dst->group_index, opt);
if (cache->debug && !opt_equal) {
char *vdst = m_option_print(opt, ddst);
char *vsrc = m_option_print(opt, dsrc);
mp_warn(cache->debug, "Option '%s' changed from "
"'%s' to' %s' (flags = 0x%"PRIx64")\n",
opt->name, vdst, vsrc, ch);
talloc_free(vdst);
talloc_free(vsrc);
}
m_option_copy(opt, ddst, dsrc);
cache->change_flags |= ch;
in->upd_opt++; // skip this next time
*p_opt = ddst;
return;
}
}
in->upd_opt++;
}
gdst->ts = gsrc->ts;
}
in->upd_group++;
in->upd_opt = 0;
}
in->upd_group = -1;
}
static bool cache_check_update(struct m_config_cache *cache)
{
struct config_cache *in = cache->internal;
struct m_config_shadow *shadow = in->shadow;
// Using atomics and checking outside of the lock - it's unknown whether
// this makes it faster or slower. Just cargo culting it.
uint64_t new_ts = atomic_load(&shadow->ts);
if (in->ts >= new_ts)
return false;
in->ts = new_ts;
in->upd_group = in->data->group_index;
in->upd_opt = 0;
return true;
}
bool m_config_cache_update(struct m_config_cache *cache)
{
struct config_cache *in = cache->internal;
struct m_config_shadow *shadow = in->shadow;
if (!cache_check_update(cache))
return false;
mp_mutex_lock(&shadow->lock);
bool res = false;
while (1) {
void *p;
update_next_option(cache, &p);
if (!p)
break;
res = true;
}
mp_mutex_unlock(&shadow->lock);
return res;
}
bool m_config_cache_get_next_changed(struct m_config_cache *cache, void **opt)
{
struct config_cache *in = cache->internal;
struct m_config_shadow *shadow = in->shadow;
*opt = NULL;
if (!cache_check_update(cache) && in->upd_group < 0)
return false;
mp_mutex_lock(&shadow->lock);
update_next_option(cache, opt);
mp_mutex_unlock(&shadow->lock);
return !!*opt;
}
static void find_opt(struct m_config_shadow *shadow, struct m_config_data *data,
void *ptr, int *group_idx, int *opt_idx)
{
*group_idx = -1;
*opt_idx = -1;
for (int n = data->group_index; n < data->group_index + data->num_gdata; n++)
{
struct m_group_data *gd = m_config_gdata(data, n);
struct m_config_group *g = &shadow->groups[n];
const struct m_option *opts = g->group->opts;
for (int i = 0; opts && opts[i].name; i++) {
const struct m_option *opt = &opts[i];
if (opt->offset >= 0 && opt->type->size &&
ptr == gd->udata + opt->offset)
{
*group_idx = n;
*opt_idx = i;
return;
}
}
}
}
bool m_config_cache_write_opt(struct m_config_cache *cache, void *ptr)
{
struct config_cache *in = cache->internal;
struct m_config_shadow *shadow = in->shadow;
int group_idx = -1;
int opt_idx = -1;
find_opt(shadow, in->data, ptr, &group_idx, &opt_idx);
// ptr was not in cache->opts, or no option declaration matching it.
assert(group_idx >= 0);
struct m_config_group *g = &shadow->groups[group_idx];
const struct m_option *opt = &g->group->opts[opt_idx];
mp_mutex_lock(&shadow->lock);
struct m_group_data *gdst = m_config_gdata(in->data, group_idx);
struct m_group_data *gsrc = m_config_gdata(in->src, group_idx);
assert(gdst && gsrc);
bool changed = !m_option_equal(opt, gsrc->udata + opt->offset, ptr) ||
opt->force_update;
if (changed) {
m_option_copy(opt, gsrc->udata + opt->offset, ptr);
gsrc->ts = atomic_fetch_add(&shadow->ts, 1) + 1;
for (int n = 0; n < shadow->num_listeners; n++) {
struct config_cache *listener = shadow->listeners[n];
if (listener->wakeup_cb && m_config_gdata(listener->data, group_idx))
listener->wakeup_cb(listener->wakeup_cb_ctx);
}
}
if (opt->force_update)
append_force_update(cache, gsrc, opt->name);
mp_mutex_unlock(&shadow->lock);
return changed;
}
void m_config_cache_set_wakeup_cb(struct m_config_cache *cache,
void (*cb)(void *ctx), void *cb_ctx)
{
struct config_cache *in = cache->internal;
struct m_config_shadow *shadow = in->shadow;
mp_mutex_lock(&shadow->lock);
if (in->in_list) {
for (int n = 0; n < shadow->num_listeners; n++) {
if (shadow->listeners[n] == in) {
MP_TARRAY_REMOVE_AT(shadow->listeners, shadow->num_listeners, n);
break;
}
}
for (int n = 0; n < shadow->num_listeners; n++)
assert(shadow->listeners[n] != in); // only 1 wakeup_cb per cache
// (The deinitialization path relies on this to free all memory.)
if (!shadow->num_listeners) {
talloc_free(shadow->listeners);
shadow->listeners = NULL;
}
}
if (cb) {
MP_TARRAY_APPEND(NULL, shadow->listeners, shadow->num_listeners, in);
in->in_list = true;
in->wakeup_cb = cb;
in->wakeup_cb_ctx = cb_ctx;
}
mp_mutex_unlock(&shadow->lock);
}
static void dispatch_notify(void *p)
{
struct config_cache *in = p;
assert(in->wakeup_dispatch_queue);
mp_dispatch_enqueue_notify(in->wakeup_dispatch_queue,
in->wakeup_dispatch_cb,
in->wakeup_dispatch_cb_ctx);
}
void m_config_cache_set_dispatch_change_cb(struct m_config_cache *cache,
struct mp_dispatch_queue *dispatch,
void (*cb)(void *ctx), void *cb_ctx)
{
struct config_cache *in = cache->internal;
// Removing the old one is tricky. First make sure no new notifications will
// come.
m_config_cache_set_wakeup_cb(cache, NULL, NULL);
// Remove any pending notifications (assume we're on the same thread as
// any potential mp_dispatch_queue_process() callers).
if (in->wakeup_dispatch_queue) {
mp_dispatch_cancel_fn(in->wakeup_dispatch_queue,
in->wakeup_dispatch_cb,
in->wakeup_dispatch_cb_ctx);
}
in->wakeup_dispatch_queue = NULL;
in->wakeup_dispatch_cb = NULL;
in->wakeup_dispatch_cb_ctx = NULL;
if (cb) {
in->wakeup_dispatch_queue = dispatch;
in->wakeup_dispatch_cb = cb;
in->wakeup_dispatch_cb_ctx = cb_ctx;
m_config_cache_set_wakeup_cb(cache, dispatch_notify, in);
}
}
void *mp_get_config_group(void *ta_parent, struct mpv_global *global,
const struct m_sub_options *group)
{
struct m_config_cache *cache = m_config_cache_alloc(NULL, global, group);
// Make talloc_free(cache->opts) free the entire cache.
ta_set_parent(cache->opts, ta_parent);
ta_set_parent(cache, cache->opts);
return cache->opts;
}
static const struct m_config_group *find_group(struct mpv_global *global,
const struct m_option *cfg)
{
struct m_config_shadow *shadow = global->config;
for (int n = 0; n < shadow->num_groups; n++) {
if (shadow->groups[n].group->opts == cfg)
return &shadow->groups[n];
}
return NULL;
}
void *m_config_group_from_desc(void *ta_parent, struct mp_log *log,
struct mpv_global *global, struct m_obj_desc *desc, const char *name)
{
const struct m_config_group *group = find_group(global, desc->options);
if (group) {
return mp_get_config_group(ta_parent, global, group->group);
} else {
void *d = talloc_zero_size(ta_parent, desc->priv_size);
if (desc->priv_defaults)
memcpy(d, desc->priv_defaults, desc->priv_size);
return d;
}
}
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