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bridge_multiplexed: Keep the multiplexed thread until no more bridges use it.

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* Fixed the potential of losing the multiplexed bridge thread when the
last channel leaves and another joins while the multiplexed thread is
being shut down.

* Refactored and improved the management of the serviced channels array.

* Changed the channels count to a bridges count so it only needs to be
incremented rather than changed by two.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@380666 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2013-01-31 18:22:56 +00:00
parent 32ac38ea37
commit a5fadc1e57
1 changed files with 137 additions and 73 deletions
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210
bridges/bridge_multiplexed.c
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@@ -50,23 +50,23 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
/*! \brief Number of buckets our multiplexed thread container can have */
#define MULTIPLEXED_BUCKETS 53
/*! \brief Number of channels we handle in a single thread */
#define MULTIPLEXED_MAX_CHANNELS 8
/*! \brief Number of bridges we handle in a single thread */
#define MULTIPLEXED_MAX_BRIDGES 4
/*! \brief Structure which represents a single thread handling multiple 2 channel bridges */
struct multiplexed_thread {
/*! Thread itself */
pthread_t thread;
/*! Channels serviced by this thread */
struct ast_channel *chans[2 * MULTIPLEXED_MAX_BRIDGES];
/*! Pipe used to wake up the multiplexed thread */
int pipe[2];
/*! Channels in this thread */
struct ast_channel *chans[MULTIPLEXED_MAX_CHANNELS];
/*! Number of channels in this thread */
unsigned int count;
/*! Bit used to indicate that the thread is waiting on channels */
unsigned int waiting:1;
/*! Number of channels actually being serviced by this thread */
unsigned int service_count;
/*! Number of bridges in this thread */
unsigned int bridges;
/*! TRUE if the thread is waiting on channels */
unsigned int waiting:1;
};
/*! \brief Container of all operating multiplexed threads */
@@ -76,7 +76,8 @@ static struct ao2_container *muxed_threads;
static int find_multiplexed_thread(void *obj, void *arg, int flags)
{
struct multiplexed_thread *muxed_thread = obj;
return (muxed_thread->count <= (MULTIPLEXED_MAX_CHANNELS - 2)) ? CMP_MATCH | CMP_STOP : 0;
return (muxed_thread->bridges < MULTIPLEXED_MAX_BRIDGES) ? CMP_MATCH | CMP_STOP : 0;
}
/*! \brief Destroy callback for a multiplexed thread structure */
@@ -147,8 +148,8 @@ static int multiplexed_bridge_create(struct ast_bridge *bridge)
ast_debug(1, "Found multiplexed thread '%p' for bridge '%p'\n", muxed_thread, bridge);
}
/* Bump the count of the thread structure up by two since the channels for this bridge will be joining shortly */
muxed_thread->count += 2;
/* Increase the number of bridges using this multiplexed bridge */
++muxed_thread->bridges;
ao2_unlock(muxed_threads);
@@ -157,7 +158,17 @@ static int multiplexed_bridge_create(struct ast_bridge *bridge)
return 0;
}
/*! \brief Internal function which nudges the thread */
/*!
* \internal
* \brief Nudges the multiplex thread.
* \since 12.0.0
*
* \param muxed_thread Controller to poke the thread.
*
* \note This function assumes the muxed_thread is locked.
*
* \return Nothing
*/
static void multiplexed_nudge(struct multiplexed_thread *muxed_thread)
{
int nudge = 0;
@@ -179,28 +190,39 @@ static void multiplexed_nudge(struct multiplexed_thread *muxed_thread)
static int multiplexed_bridge_destroy(struct ast_bridge *bridge)
{
struct multiplexed_thread *muxed_thread;
pthread_t thread;
muxed_thread = bridge->bridge_pvt;
if (!muxed_thread) {
return -1;
}
bridge->bridge_pvt = NULL;
ao2_lock(muxed_threads);
muxed_thread->count -= 2;
if (!muxed_thread->count) {
ast_debug(1, "Unlinking multiplexed thread '%p' since nobody is using it anymore\n", muxed_thread);
if (--muxed_thread->bridges) {
/* Other bridges are still using the multiplexed thread. */
ao2_unlock(muxed_threads);
} else {
ast_debug(1, "Unlinking multiplexed thread '%p' since nobody is using it anymore\n",
muxed_thread);
ao2_unlink(muxed_threads, muxed_thread);
ao2_unlock(muxed_threads);
/* Stop the multiplexed bridge thread. */
ao2_lock(muxed_thread);
multiplexed_nudge(muxed_thread);
thread = muxed_thread->thread;
muxed_thread->thread = AST_PTHREADT_STOP;
ao2_unlock(muxed_thread);
if (thread != AST_PTHREADT_NULL) {
/* Wait for multiplexed bridge thread to die. */
pthread_join(thread, NULL);
}
}
multiplexed_nudge(muxed_thread);
ao2_unlock(muxed_threads);
ao2_ref(muxed_thread, -1);
bridge->bridge_pvt = NULL;
return 0;
}
@@ -210,20 +232,24 @@ static void *multiplexed_thread_function(void *data)
struct multiplexed_thread *muxed_thread = data;
int fds = muxed_thread->pipe[0];
ao2_lock(muxed_thread);
ast_debug(1, "Starting actual thread for multiplexed thread '%p'\n", muxed_thread);
ao2_lock(muxed_thread);
while (muxed_thread->thread != AST_PTHREADT_STOP) {
struct ast_channel *winner;
struct ast_channel *first = muxed_thread->chans[0];
int to = -1;
int outfd = -1;
/* Move channels around so not just the first one gets priority */
memmove(muxed_thread->chans, muxed_thread->chans + 1,
sizeof(struct ast_channel *) * (muxed_thread->service_count - 1));
muxed_thread->chans[muxed_thread->service_count - 1] = first;
if (1 < muxed_thread->service_count) {
struct ast_channel *first;
/* Move channels around so not just the first one gets priority */
first = muxed_thread->chans[0];
memmove(muxed_thread->chans, muxed_thread->chans + 1,
sizeof(struct ast_channel *) * (muxed_thread->service_count - 1));
muxed_thread->chans[muxed_thread->service_count - 1] = first;
}
muxed_thread->waiting = 1;
ao2_unlock(muxed_thread);
@@ -263,70 +289,108 @@ static void *multiplexed_thread_function(void *data)
}
}
muxed_thread->thread = AST_PTHREADT_NULL;
ao2_unlock(muxed_thread);
ast_debug(1, "Stopping actual thread for multiplexed thread '%p'\n", muxed_thread);
ao2_unlock(muxed_thread);
ao2_ref(muxed_thread, -1);
return NULL;
}
/*! \brief Helper function which adds or removes a channel and nudges the thread */
static void multiplexed_add_or_remove(struct multiplexed_thread *muxed_thread, struct ast_channel *chan, int add)
/*!
* \internal
* \brief Check to see if the multiplexed bridge thread needs to be started.
* \since 12.0.0
*
* \param muxed_thread Controller to check if need to start thread.
*
* \note This function assumes the muxed_thread is locked.
*
* \return Nothing
*/
static void multiplexed_thread_start(struct multiplexed_thread *muxed_thread)
{
if (muxed_thread->service_count && muxed_thread->thread == AST_PTHREADT_NULL) {
ao2_ref(muxed_thread, +1);
if (ast_pthread_create(&muxed_thread->thread, NULL, multiplexed_thread_function, muxed_thread)) {
muxed_thread->thread = AST_PTHREADT_NULL;/* For paranoia's sake. */
ao2_ref(muxed_thread, -1);
ast_log(LOG_WARNING, "Failed to create the common thread for multiplexed thread '%p', trying next time\n",
muxed_thread);
}
}
}
/*!
* \internal
* \brief Add a channel to the multiplexed bridge.
* \since 12.0.0
*
* \param muxed_thread Controller to add a channel.
* \param chan Channel to add to the channel service array.
*
* \return Nothing
*/
static void multiplexed_chan_add(struct multiplexed_thread *muxed_thread, struct ast_channel *chan)
{
int idx;
pthread_t thread = AST_PTHREADT_NULL;
ao2_lock(muxed_thread);
multiplexed_nudge(muxed_thread);
for (idx = 0; idx < ARRAY_LEN(muxed_thread->chans); ++idx) {
/* Check if already in the channel service array for safety. */
for (idx = 0; idx < muxed_thread->service_count; ++idx) {
if (muxed_thread->chans[idx] == chan) {
if (!add) {
memmove(muxed_thread->chans + idx,
muxed_thread->chans + idx + 1,
sizeof(struct ast_channel *) * (ARRAY_LEN(muxed_thread->chans) - (idx + 1)));
muxed_thread->chans[ARRAY_LEN(muxed_thread->chans) - 1] = NULL;
--muxed_thread->service_count;
}
break;
}
if (!muxed_thread->chans[idx]) {
if (add) {
muxed_thread->chans[idx] = chan;
++muxed_thread->service_count;
}
break;
}
}
if (ARRAY_LEN(muxed_thread->chans) == idx && add) {
ast_log(LOG_ERROR, "Could not add channel %s to multiplexed thread %p. Array not large enough.\n",
ast_channel_name(chan), muxed_thread);
ast_assert(0);
if (idx == muxed_thread->service_count) {
/* Channel to add was not already in the array. */
if (muxed_thread->service_count < ARRAY_LEN(muxed_thread->chans)) {
muxed_thread->chans[muxed_thread->service_count++] = chan;
} else {
ast_log(LOG_ERROR, "Could not add channel %s to multiplexed thread %p. Array not large enough.\n",
ast_channel_name(chan), muxed_thread);
ast_assert(0);
}
}
if (muxed_thread->service_count && muxed_thread->thread == AST_PTHREADT_NULL) {
ao2_ref(muxed_thread, +1);
if (ast_pthread_create(&muxed_thread->thread, NULL, multiplexed_thread_function, muxed_thread)) {
ao2_ref(muxed_thread, -1);
ast_log(LOG_WARNING, "Failed to create the bridge thread for multiplexed thread '%p', trying next time\n",
muxed_thread);
}
} else if (!muxed_thread->service_count
&& muxed_thread->thread != AST_PTHREADT_NULL
&& muxed_thread->thread != AST_PTHREADT_STOP) {
thread = muxed_thread->thread;
muxed_thread->thread = AST_PTHREADT_STOP;
}
multiplexed_thread_start(muxed_thread);
ao2_unlock(muxed_thread);
}
if (thread != AST_PTHREADT_NULL) {
pthread_join(thread, NULL);
/*!
* \internal
* \brief Remove a channel from the multiplexed bridge.
* \since 12.0.0
*
* \param muxed_thread Controller to remove a channel.
* \param chan Channel to remove from the channel service array.
*
* \return Nothing
*/
static void multiplexed_chan_remove(struct multiplexed_thread *muxed_thread, struct ast_channel *chan)
{
int idx;
ao2_lock(muxed_thread);
multiplexed_nudge(muxed_thread);
/* Remove channel from service array. */
for (idx = 0; idx < muxed_thread->service_count; ++idx) {
if (muxed_thread->chans[idx] != chan) {
continue;
}
muxed_thread->chans[idx] = muxed_thread->chans[--muxed_thread->service_count];
break;
}
multiplexed_thread_start(muxed_thread);
ao2_unlock(muxed_thread);
}
/*! \brief Join function which actually adds the channel into the array to be monitored */
@@ -338,7 +402,7 @@ static int multiplexed_bridge_join(struct ast_bridge *bridge, struct ast_bridge_
ast_debug(1, "Adding channel '%s' to multiplexed thread '%p' for monitoring\n", ast_channel_name(bridge_channel->chan), muxed_thread);
multiplexed_add_or_remove(muxed_thread, bridge_channel->chan, 1);
multiplexed_chan_add(muxed_thread, bridge_channel->chan);
/* If the second channel has not yet joined do not make things compatible */
if (c0 == c1) {
@@ -361,7 +425,7 @@ static int multiplexed_bridge_leave(struct ast_bridge *bridge, struct ast_bridge
ast_debug(1, "Removing channel '%s' from multiplexed thread '%p'\n", ast_channel_name(bridge_channel->chan), muxed_thread);
multiplexed_add_or_remove(muxed_thread, bridge_channel->chan, 0);
multiplexed_chan_remove(muxed_thread, bridge_channel->chan);
return 0;
}
@@ -373,7 +437,7 @@ static void multiplexed_bridge_suspend(struct ast_bridge *bridge, struct ast_bri
ast_debug(1, "Suspending channel '%s' from multiplexed thread '%p'\n", ast_channel_name(bridge_channel->chan), muxed_thread);
multiplexed_add_or_remove(muxed_thread, bridge_channel->chan, 0);
multiplexed_chan_remove(muxed_thread, bridge_channel->chan);
}
/*! \brief Unsuspend function which means control of the channel is coming back to us */
@@ -383,7 +447,7 @@ static void multiplexed_bridge_unsuspend(struct ast_bridge *bridge, struct ast_b
ast_debug(1, "Unsuspending channel '%s' from multiplexed thread '%p'\n", ast_channel_name(bridge_channel->chan), muxed_thread);
multiplexed_add_or_remove(muxed_thread, bridge_channel->chan, 1);
multiplexed_chan_add(muxed_thread, bridge_channel->chan);
}
/*! \brief Write function for writing frames into the bridge */