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Merge changes from topic 'ASTERISK-26343' into 14

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* changes:
  channel: Use frame deferral API for safe sleep.
  autoservice: Use frame deferral API
  AGI: Only defer frames when in an interception routine.
  Add API for channel frame deferral.
changes/53/4353/1
Joshua Colp 9 years ago committed by Gerrit Code Review
parent ea13d9c017 1db9e7886c
commit c2b3f6eb10
5 changed files with 124 additions and 126 deletions
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38
include/asterisk/channel.h
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@ -967,6 +967,11 @@ enum {
* The channel is executing a subroutine or macro
*/
AST_FLAG_SUBROUTINE_EXEC = (1 << 27),
/*!
* The channel is currently in an operation where
* frames should be deferred.
*/
AST_FLAG_DEFER_FRAMES = (1 << 28),
};
/*! \brief ast_bridge_config flags */
@ -4661,4 +4666,37 @@ enum ast_channel_error {
*/
enum ast_channel_error ast_channel_errno(void);
/*!
* \brief Retrieve the deferred read queue.
*/
struct ast_readq_list *ast_channel_deferred_readq(struct ast_channel *chan);
/*!
* \brief Start deferring deferrable frames on this channel
*
* Sometimes, a channel gets entered into a mode where a "main" application
* is tasked with servicing frames on the channel, but that application does
* not need to act on those frames. However, it would be imprudent to simply
* drop important frames. This function can be called so that important frames
* will be deferred, rather than placed in the channel frame queue as normal.
*
* \pre chan MUST be locked before calling
*
* \param chan The channel on which frames should be deferred
*/
void ast_channel_start_defer_frames(struct ast_channel *chan);
/*!
* \brief Stop deferring deferrable frames on this channel
*
* When it is time to stop deferring frames on the channel, all deferred frames
* will be queued onto the channel's read queue so that the next servicer of
* the channel can handle those frames as necessary.
*
* \pre chan MUST be locked before calling
*
* \param chan The channel on which to stop deferring frames.
*/
void ast_channel_stop_defer_frames(struct ast_channel *chan);
#endif /* _ASTERISK_CHANNEL_H */

66
main/autoservice.c
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@ -61,10 +61,6 @@ struct asent {
unsigned int use_count;
unsigned int orig_end_dtmf_flag:1;
unsigned int ignore_frame_types;
/*! Frames go on at the head of deferred_frames, so we have the frames
* from newest to oldest. As we put them at the head of the readq, we'll
* end up with them in the right order for the channel's readq. */
AST_LIST_HEAD_NOLOCK(, ast_frame) deferred_frames;
AST_LIST_ENTRY(asent) list;
};
@ -79,19 +75,13 @@ static int as_chan_list_state;
static void *autoservice_run(void *ign)
{
ast_callid callid = 0;
struct ast_frame hangup_frame = {
.frametype = AST_FRAME_CONTROL,
.subclass.integer = AST_CONTROL_HANGUP,
};
while (!asexit) {
struct ast_channel *mons[MAX_AUTOMONS];
struct asent *ents[MAX_AUTOMONS];
struct ast_channel *chan;
struct asent *as;
int i, x = 0, ms = 50;
int x = 0, ms = 50;
struct ast_frame *f = NULL;
struct ast_frame *defer_frame = NULL;
AST_LIST_LOCK(&aslist);
@ -106,7 +96,6 @@ static void *autoservice_run(void *ign)
AST_LIST_TRAVERSE(&aslist, as, list) {
if (!ast_check_hangup(as->chan)) {
if (x < MAX_AUTOMONS) {
ents[x] = as;
mons[x++] = as->chan;
} else {
ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events. Fix autoservice.c\n");
@ -134,51 +123,9 @@ static void *autoservice_run(void *ign)
ast_callid_threadassoc_change(callid);
f = ast_read(chan);
if (!f) {
/* No frame means the channel has been hung up.
* A hangup frame needs to be queued here as ast_waitfor() may
* never return again for the condition to be detected outside
* of autoservice. So, we'll leave a HANGUP queued up so the
* thread in charge of this channel will know. */
defer_frame = &hangup_frame;
} else if (ast_is_deferrable_frame(f)) {
defer_frame = f;
} else {
/* Can't defer. Discard and continue with next. */
if (f) {
ast_frfree(f);
continue;
}
for (i = 0; i < x; i++) {
struct ast_frame *dup_f;
if (mons[i] != chan) {
continue;
}
if (!f) { /* defer_frame == &hangup_frame */
if ((dup_f = ast_frdup(defer_frame))) {
AST_LIST_INSERT_HEAD(&ents[i]->deferred_frames, dup_f, frame_list);
}
} else {
if ((dup_f = ast_frisolate(defer_frame))) {
AST_LIST_INSERT_HEAD(&ents[i]->deferred_frames, dup_f, frame_list);
}
if (dup_f != defer_frame) {
ast_frfree(defer_frame);
}
}
break;
}
/* The ast_waitfor_n() call will only read frames from
* the channels' file descriptors. If ast_waitfor_n()
* returns non-NULL, then one of the channels in the
* mons array must have triggered the return. It's
* therefore impossible that we got here while (i >= x).
* If we did, we'd need to ast_frfree(f) if (f). */
}
ast_callid_threadassoc_change(0);
@ -217,6 +164,7 @@ int ast_autoservice_start(struct ast_channel *chan)
as->orig_end_dtmf_flag = ast_test_flag(ast_channel_flags(chan), AST_FLAG_END_DTMF_ONLY) ? 1 : 0;
if (!as->orig_end_dtmf_flag)
ast_set_flag(ast_channel_flags(chan), AST_FLAG_END_DTMF_ONLY);
ast_channel_start_defer_frames(chan);
ast_channel_unlock(chan);
AST_LIST_LOCK(&aslist);
@ -250,7 +198,6 @@ int ast_autoservice_stop(struct ast_channel *chan)
{
int res = -1;
struct asent *as, *removed = NULL;
struct ast_frame *f;
int chan_list_state;
AST_LIST_LOCK(&aslist);
@ -302,12 +249,7 @@ int ast_autoservice_stop(struct ast_channel *chan)
}
ast_channel_lock(chan);
while ((f = AST_LIST_REMOVE_HEAD(&as->deferred_frames, frame_list))) {
if (!((1 << f->frametype) & as->ignore_frame_types)) {
ast_queue_frame_head(chan, f);
}
ast_frfree(f);
}
ast_channel_stop_defer_frames(chan);
ast_channel_unlock(chan);
ast_free(as);

102
main/channel.c
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@ -1064,6 +1064,25 @@ struct ast_channel *__ast_dummy_channel_alloc(const char *file, int line, const
return tmp;
}
void ast_channel_start_defer_frames(struct ast_channel *chan)
{
ast_set_flag(ast_channel_flags(chan), AST_FLAG_DEFER_FRAMES);
}
void ast_channel_stop_defer_frames(struct ast_channel *chan)
{
ast_clear_flag(ast_channel_flags(chan), AST_FLAG_DEFER_FRAMES);
/* Move the deferred frames onto the channel read queue, ahead of other queued frames */
ast_queue_frame_head(chan, AST_LIST_FIRST(ast_channel_deferred_readq(chan)));
/* ast_frfree will mosey down the list and free them all */
if (!AST_LIST_EMPTY(ast_channel_deferred_readq(chan))) {
ast_frfree(AST_LIST_FIRST(ast_channel_deferred_readq(chan)));
}
/* Reset the list to be empty */
AST_LIST_HEAD_INIT_NOLOCK(ast_channel_deferred_readq(chan));
}
static int __ast_queue_frame(struct ast_channel *chan, struct ast_frame *fin, int head, struct ast_frame *after)
{
struct ast_frame *f;
@ -1527,19 +1546,18 @@ int ast_safe_sleep_conditional(struct ast_channel *chan, int timeout_ms, int (*c
int res = 0;
struct timeval start;
int ms;
AST_LIST_HEAD_NOLOCK(, ast_frame) deferred_frames;
AST_LIST_HEAD_INIT_NOLOCK(&deferred_frames);
/* If no other generator is present, start silencegen while waiting */
if (ast_opt_transmit_silence && !ast_channel_generatordata(chan)) {
silgen = ast_channel_start_silence_generator(chan);
}
ast_channel_lock(chan);
ast_channel_start_defer_frames(chan);
ast_channel_unlock(chan);
start = ast_tvnow();
while ((ms = ast_remaining_ms(start, timeout_ms))) {
struct ast_frame *dup_f = NULL;
if (cond && ((*cond)(data) == 0)) {
break;
}
@ -1554,18 +1572,7 @@ int ast_safe_sleep_conditional(struct ast_channel *chan, int timeout_ms, int (*c
res = -1;
break;
}
if (!ast_is_deferrable_frame(f)) {
ast_frfree(f);
continue;
}
if ((dup_f = ast_frisolate(f))) {
if (dup_f != f) {
ast_frfree(f);
}
AST_LIST_INSERT_HEAD(&deferred_frames, dup_f, frame_list);
}
ast_frfree(f);
}
}
@ -1574,17 +1581,8 @@ int ast_safe_sleep_conditional(struct ast_channel *chan, int timeout_ms, int (*c
ast_channel_stop_silence_generator(chan, silgen);
}
/* We need to free all the deferred frames, but we only need to
* queue the deferred frames if there was no error and no
* hangup was received
*/
ast_channel_lock(chan);
while ((f = AST_LIST_REMOVE_HEAD(&deferred_frames, frame_list))) {
if (!res) {
ast_queue_frame_head(chan, f);
}
ast_frfree(f);
}
ast_channel_stop_defer_frames(chan);
ast_channel_unlock(chan);
return res;
@ -3885,6 +3883,32 @@ static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
if (!AST_LIST_EMPTY(ast_channel_readq(chan))) {
int skip_dtmf = should_skip_dtmf(chan);
if (ast_test_flag(ast_channel_flags(chan), AST_FLAG_DEFER_FRAMES)) {
AST_LIST_TRAVERSE_SAFE_BEGIN(ast_channel_readq(chan), f, frame_list) {
if (ast_is_deferrable_frame(f)) {
if (f->frametype == AST_FRAME_CONTROL && f->subclass.integer == AST_CONTROL_HANGUP) {
struct ast_frame *dup;
/* Hangup is a special case. We want to defer the frame, but we also do not
* want to remove it from the frame queue. So rather than just moving the frame
* over, we duplicate it and move the copy to the deferred readq.
*
* The reason for this? This way, whoever calls ast_read() will get a NULL return
* immediately and can tell the channel has hung up and do what it needs to. Also,
* when frame deferral finishes, then whoever calls ast_read() next will also get
* the hangup.
*/
dup = ast_frdup(f);
AST_LIST_INSERT_TAIL(ast_channel_deferred_readq(chan), dup, frame_list);
} else {
AST_LIST_INSERT_TAIL(ast_channel_deferred_readq(chan), f, frame_list);
AST_LIST_REMOVE_CURRENT(frame_list);
}
}
}
AST_LIST_TRAVERSE_SAFE_END;
}
AST_LIST_TRAVERSE_SAFE_BEGIN(ast_channel_readq(chan), f, frame_list) {
/* We have to be picky about which frame we pull off of the readq because
* there are cases where we want to leave DTMF frames on the queue until
@ -10216,9 +10240,15 @@ int ast_channel_connected_line_macro(struct ast_channel *autoservice_chan, struc
ast_party_connected_line_copy(ast_channel_connected(macro_chan), connected);
}
ast_channel_start_defer_frames(macro_chan);
ast_channel_unlock(macro_chan);
retval = ast_app_run_macro(autoservice_chan, macro_chan, macro, macro_args);
ast_channel_lock(macro_chan);
ast_channel_stop_defer_frames(macro_chan);
ast_channel_unlock(macro_chan);
if (!retval) {
struct ast_party_connected_line saved_connected;
@ -10266,9 +10296,15 @@ int ast_channel_redirecting_macro(struct ast_channel *autoservice_chan, struct a
ast_party_redirecting_copy(ast_channel_redirecting(macro_chan), redirecting);
}
ast_channel_start_defer_frames(macro_chan);
ast_channel_unlock(macro_chan);
retval = ast_app_run_macro(autoservice_chan, macro_chan, macro, macro_args);
ast_channel_lock(macro_chan);
ast_channel_stop_defer_frames(macro_chan);
ast_channel_unlock(macro_chan);
if (!retval) {
struct ast_party_redirecting saved_redirecting;
@ -10309,9 +10345,15 @@ int ast_channel_connected_line_sub(struct ast_channel *autoservice_chan, struct
ast_party_connected_line_copy(ast_channel_connected(sub_chan), connected);
}
ast_channel_start_defer_frames(sub_chan);
ast_channel_unlock(sub_chan);
retval = ast_app_run_sub(autoservice_chan, sub_chan, sub, sub_args, 0);
ast_channel_lock(sub_chan);
ast_channel_stop_defer_frames(sub_chan);
ast_channel_unlock(sub_chan);
if (!retval) {
struct ast_party_connected_line saved_connected;
@ -10352,9 +10394,15 @@ int ast_channel_redirecting_sub(struct ast_channel *autoservice_chan, struct ast
ast_party_redirecting_copy(ast_channel_redirecting(sub_chan), redirecting);
}
ast_channel_start_defer_frames(sub_chan);
ast_channel_unlock(sub_chan);
retval = ast_app_run_sub(autoservice_chan, sub_chan, sub, sub_args, 0);
ast_channel_lock(sub_chan);
ast_channel_stop_defer_frames(sub_chan);
ast_channel_unlock(sub_chan);
if (!retval) {
struct ast_party_redirecting saved_redirecting;

6
main/channel_internal_api.c
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@ -223,6 +223,7 @@ struct ast_channel {
struct stasis_cp_single *topics; /*!< Topic for all channel's events */
struct stasis_forward *endpoint_forward; /*!< Subscription for event forwarding to endpoint's topic */
struct stasis_forward *endpoint_cache_forward; /*!< Subscription for cache updates to endpoint's topic */
struct ast_readq_list deferred_readq;
};
/*! \brief The monotonically increasing integer counter for channel uniqueids */
@ -1683,3 +1684,8 @@ enum ast_channel_error ast_channel_internal_errno(void)
return *error_code;
}
struct ast_readq_list *ast_channel_deferred_readq(struct ast_channel *chan)
{
return &chan->deferred_readq;
}

38
res/res_agi.c
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@ -4093,23 +4093,6 @@ static enum agi_result agi_handle_command(struct ast_channel *chan, AGI *agi, ch
return AGI_RESULT_SUCCESS;
}
AST_LIST_HEAD_NOLOCK(deferred_frames, ast_frame);
static void queue_deferred_frames(struct deferred_frames *deferred_frames,
struct ast_channel *chan)
{
struct ast_frame *f;
if (!AST_LIST_EMPTY(deferred_frames)) {
ast_channel_lock(chan);
while ((f = AST_LIST_REMOVE_HEAD(deferred_frames, frame_list))) {
ast_queue_frame_head(chan, f);
ast_frfree(f);
}
ast_channel_unlock(chan);
}
}
static enum agi_result run_agi(struct ast_channel *chan, char *request, AGI *agi, int pid, int *status, int dead, int argc, char *argv[])
{
struct ast_channel *c;
@ -4128,9 +4111,6 @@ static enum agi_result run_agi(struct ast_channel *chan, char *request, AGI *agi
const char *sighup_str;
const char *exit_on_hangup_str;
int exit_on_hangup;
struct deferred_frames deferred_frames;
AST_LIST_HEAD_INIT_NOLOCK(&deferred_frames);
ast_channel_lock(chan);
sighup_str = pbx_builtin_getvar_helper(chan, "AGISIGHUP");
@ -4192,20 +4172,8 @@ static enum agi_result run_agi(struct ast_channel *chan, char *request, AGI *agi
/* Write, ignoring errors */
if (write(agi->audio, f->data.ptr, f->datalen) < 0) {
}
ast_frfree(f);
} else if (ast_is_deferrable_frame(f)) {
struct ast_frame *dup_f;
if ((dup_f = ast_frisolate(f))) {
AST_LIST_INSERT_HEAD(&deferred_frames, dup_f, frame_list);
}
if (dup_f != f) {
ast_frfree(f);
}
} else {
ast_frfree(f);
}
ast_frfree(f);
}
} else if (outfd > -1) {
size_t len = sizeof(buf);
@ -4253,8 +4221,6 @@ static enum agi_result run_agi(struct ast_channel *chan, char *request, AGI *agi
buf[buflen - 1] = '\0';
}
queue_deferred_frames(&deferred_frames, chan);
if (agidebug)
ast_verbose("<%s>AGI Rx << %s\n", ast_channel_name(chan), buf);
cmd_status = agi_handle_command(chan, agi, buf, dead);
@ -4277,8 +4243,6 @@ static enum agi_result run_agi(struct ast_channel *chan, char *request, AGI *agi
}
}
queue_deferred_frames(&deferred_frames, chan);
if (agi->speech) {
ast_speech_destroy(agi->speech);
}

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