Merge "res_pjsip: Add serialized scheduler (res_pjsip/pjsip_scheduler.c)"

include/asterisk/astobj2.h

@@ -20,6 +20,7 @@
 #include "asterisk/compat.h"
 #include "asterisk/lock.h"
 #include "asterisk/linkedlists.h"
+#include "asterisk/inline_api.h"
 
 /*! \file
  * \ref AstObj2
@@ -725,6 +726,46 @@ int __ao2_trylock(void *a, enum ao2_lock_req lock_how, const char *file, const c
 void *ao2_object_get_lockaddr(void *obj);
 
 
+/*!
+ * \brief Increment reference count on an object and lock it
+ * \since 13.9.0
+ *
+ * \param[in] obj A pointer to the ao2 object
+ * \retval 0 The object is not an ao2 object or wasn't locked successfully
+ * \retval 1 The object's reference count was incremented and was locked
+ */
+AST_INLINE_API(
+int ao2_ref_and_lock(void *obj),
+{
+	ao2_ref(obj, +1);
+	if (ao2_lock(obj)) {
+		ao2_ref(obj, -1);
+		return 0;
+	}
+	return 1;
+}
+)
+
+/*!
+ * \brief Unlock an object and decrement its reference count
+ * \since 13.9.0
+ *
+ * \param[in] obj A pointer to the ao2 object
+ * \retval 0 The object is not an ao2 object or wasn't unlocked successfully
+ * \retval 1 The object was unlocked and it's reference count was decremented
+ */
+AST_INLINE_API(
+int ao2_unlock_and_unref(void *obj),
+{
+	if (ao2_unlock(obj)) {
+		return 0;
+	}
+	ao2_ref(obj, -1);
+
+	return 1;
+}
+)
+
 /*! Global ao2 object holder structure. */
 struct ao2_global_obj {
 	/*! Access lock to the held ao2 object. */
@@ -1903,4 +1944,97 @@ void ao2_iterator_cleanup(struct ao2_iterator *iter);
  */
 int ao2_iterator_count(struct ao2_iterator *iter);
 
+/*!
+ * \brief Creates a hash function for a structure string field.
+ * \param stype The structure type
+ * \param field The string field in the structure to hash
+ *
+ * AO2_STRING_FIELD_HASH_CB(mystruct, myfield) will produce a function
+ * named mystruct_hash_fn which hashes mystruct->myfield.
+ */
+#define AO2_STRING_FIELD_HASH_FN(stype, field) \
+static int stype ## _hash_fn(const void *obj, const int flags) \
+{ \
+	const struct stype *object = obj; \
+	const char *key; \
+	switch (flags & OBJ_SEARCH_MASK) { \
+	case OBJ_SEARCH_KEY: \
+		key = obj; \
+		break; \
+	case OBJ_SEARCH_OBJECT: \
+		key = object->field; \
+		break; \
+	default: \
+		ast_assert(0); \
+		return 0; \
+	} \
+	return ast_str_hash(key); \
+}
+
+/*!
+ * \brief Creates a compare function for a structure string field.
+ * \param stype The structure type
+ * \param field The string field in the structure to compare
+ *
+ * AO2_STRING_FIELD_CMP_FN(mystruct, myfield) will produce a function
+ * named mystruct_cmp_fn which compares mystruct->myfield.
+ */
+#define AO2_STRING_FIELD_CMP_FN(stype, field) \
+static int stype ## _cmp_fn(void *obj, void *arg, int flags) \
+{ \
+	const struct stype *object_left = obj, *object_right = arg; \
+	const char *right_key = arg; \
+	int cmp; \
+	switch (flags & OBJ_SEARCH_MASK) { \
+	case OBJ_SEARCH_OBJECT: \
+		right_key = object_right->field; \
+	case OBJ_SEARCH_KEY: \
+		cmp = strcmp(object_left->field, right_key); \
+		break; \
+	case OBJ_SEARCH_PARTIAL_KEY: \
+		cmp = strncmp(object_left->field, right_key, strlen(right_key)); \
+		break; \
+	default: \
+		cmp = 0; \
+		break; \
+	} \
+	if (cmp) { \
+		return 0; \
+	} \
+	return CMP_MATCH; \
+}
+
+/*!
+ * \brief Creates a sort function for a structure string field.
+ * \param stype The structure type
+ * \param field The string field in the structure to compare
+ *
+ * AO2_STRING_FIELD_SORT_FN(mystruct, myfield) will produce a function
+ * named mystruct_sort_fn which compares mystruct->myfield.
+ */
+#define AO2_STRING_FIELD_SORT_FN(stype, field) \
+static int stype ## _sort_fn(const void *obj, const void *arg, int flags) \
+{ \
+	const struct stype *object_left = obj; \
+	const struct stype *object_right = arg; \
+	const char *right_key = arg; \
+	int cmp; \
+\
+	switch (flags & OBJ_SEARCH_MASK) { \
+	case OBJ_SEARCH_OBJECT: \
+		right_key = object_right->field; \
+		/* Fall through */ \
+	case OBJ_SEARCH_KEY: \
+		cmp = strcmp(object_left->field, right_key); \
+		break; \
+	case OBJ_SEARCH_PARTIAL_KEY: \
+		cmp = strncmp(object_left->field, right_key, strlen(right_key)); \
+		break; \
+	default: \
+		cmp = 0; \
+		break; \
+	} \
+	return cmp; \
+}
+
 #endif /* _ASTERISK_ASTOBJ2_H */

include/asterisk/res_pjsip.h

@@ -19,6 +19,13 @@
 #ifndef _RES_PJSIP_H
 #define _RES_PJSIP_H
 
+#include <pjsip.h>
+/* Needed for SUBSCRIBE, NOTIFY, and PUBLISH method definitions */
+#include <pjsip_simple.h>
+#include <pjsip/sip_transaction.h>
+#include <pj/timer.h>
+#include <pjlib.h>
+
 #include "asterisk/stringfields.h"
 /* Needed for struct ast_sockaddr */
 #include "asterisk/netsock2.h"
@@ -1166,8 +1173,9 @@ struct ast_sip_auth *ast_sip_get_artificial_auth(void);
  */
 struct ast_sip_endpoint *ast_sip_get_artificial_endpoint(void);
 
-/*!
+/*! \defgroup pjsip_threading PJSIP Threading Model
- * \page Threading model for SIP
+ * @{
+ * \page PJSIP PJSIP Threading Model
  *
  * There are three major types of threads that SIP will have to deal with:
  * \li Asterisk threads
@@ -1216,6 +1224,19 @@ struct ast_sip_endpoint *ast_sip_get_artificial_endpoint(void);
  * previous tasks pushed with the same serializer have completed. For more information
  * on serializers and the benefits they provide, see \ref ast_threadpool_serializer
  *
+ * \par Scheduler
+ *
+ * Some situations require that a task run periodically or at a future time.  Normally
+ * the ast_sched functionality would be used but ast_sched only uses 1 thread for all
+ * tasks and that thread isn't registered with PJLIB and therefore can't do any PJSIP
+ * related work.
+ *
+ * ast_sip_sched uses ast_sched only as a scheduled queue.  When a task is ready to run,
+ * it's pushed to a Serializer to be invoked asynchronously by a Servant.  This ensures
+ * that the task is executed in a PJLIB registered thread and allows the ast_sched thread
+ * to immediately continue processing the queue.  The Serializer used by ast_sip_sched
+ * is one of your choosing or a random one from the res_pjsip pool if you don't choose one.
+ *
  * \note
  *
  * Do not make assumptions about individual threads based on a corresponding serializer.
@@ -1224,6 +1245,8 @@ struct ast_sip_endpoint *ast_sip_get_artificial_endpoint(void);
  * tasks, even though they are all guaranteed to be executed in sequence.
  */
 
+typedef int (*ast_sip_task)(void *user_data);
+
 /*!
  * \brief Create a new serializer for SIP tasks
  * \since 13.8.0
@@ -1333,6 +1356,214 @@ int ast_sip_push_task_synchronous(struct ast_taskprocessor *serializer, int (*si
  */
 int ast_sip_thread_is_servant(void);
 
+/*!
+ * \brief Task flags for the res_pjsip scheduler
+ *
+ * The default is AST_SIP_SCHED_TASK_FIXED
+ *                | AST_SIP_SCHED_TASK_DATA_NOT_AO2
+ *                | AST_SIP_SCHED_TASK_DATA_NO_CLEANUP
+ *                | AST_SIP_SCHED_TASK_PERIODIC
+ */
+enum ast_sip_scheduler_task_flags {
+	/*!
+	 * The defaults
+	 */
+	AST_SIP_SCHED_TASK_DEFAULTS = (0 << 0),
+
+	/*!
+	 * Run at a fixed interval.
+	 * Stop scheduling if the callback returns 0.
+	 * Any other value is ignored.
+	 */
+	AST_SIP_SCHED_TASK_FIXED = (0 << 0),
+	/*!
+	 * Run at a variable interval.
+	 * Stop scheduling if the callback returns 0.
+	 * Any other return value is used as the new interval.
+	 */
+	AST_SIP_SCHED_TASK_VARIABLE = (1 << 0),
+
+	/*!
+	 * The task data is not an AO2 object.
+	 */
+	AST_SIP_SCHED_TASK_DATA_NOT_AO2 = (0 << 1),
+	/*!
+	 * The task data is an AO2 object.
+	 * A reference count will be held by the scheduler until
+	 * after the task has run for the final time (if ever).
+	 */
+	AST_SIP_SCHED_TASK_DATA_AO2 = (1 << 1),
+
+	/*!
+	 * Don't take any cleanup action on the data
+	 */
+	AST_SIP_SCHED_TASK_DATA_NO_CLEANUP = (0 << 3),
+	/*!
+	 * If AST_SIP_SCHED_TASK_DATA_AO2 is set, decrement the reference count
+	 * otherwise call ast_free on it.
+	 */
+	AST_SIP_SCHED_TASK_DATA_FREE = ( 1 << 3 ),
+
+	/*! \brief AST_SIP_SCHED_TASK_PERIODIC
+	 * The task is scheduled at multiples of interval
+	 * \see Interval
+	 */
+	AST_SIP_SCHED_TASK_PERIODIC = (0 << 4),
+	/*! \brief AST_SIP_SCHED_TASK_DELAY
+	 * The next invocation of the task is at last finish + interval
+	 * \see Interval
+	 */
+	AST_SIP_SCHED_TASK_DELAY = (1 << 4),
+};
+
+/*!
+ * \brief Scheduler task data structure
+ */
+struct ast_sip_sched_task;
+
+/*!
+ * \brief Schedule a task to run in the res_pjsip thread pool
+ * \since 13.9.0
+ *
+ * \param serializer The serializer to use.  If NULL, don't use a serializer (see note below)
+ * \param interval The invocation interval in milliseconds (see note below)
+ * \param sip_task The task to invoke
+ * \param name An optional name to associate with the task
+ * \param task_data Optional data to pass to the task
+ * \param flags One of enum ast_sip_scheduler_task_type
+ *
+ * \returns Pointer to \ref ast_sip_sched_task ao2 object which must be dereferenced when done.
+ *
+ * \paragraph Serialization
+ *
+ * Specifying a serializer guarantees serialized execution but NOT specifying a serializer
+ * may still result in tasks being effectively serialized if the thread pool is busy.
+ * The point of the serializer BTW is not to prevent parallel executions of the SAME task.
+ * That happens automatically (see below).  It's to prevent the task from running at the same
+ * time as other work using the same serializer, whether or not it's being run by the scheduler.
+ *
+ * \paragraph Interval
+ *
+ * The interval is used to calculate the next time the task should run.  There are two models.
+ *
+ * \ref AST_SIP_SCHED_TASK_PERIODIC specifies that the invocations of the task occur at the
+ * specific interval.  That is, every \ref "interval" milliseconds, regardless of how long the task
+ * takes. If the task takes longer than \ref interval, it will be scheduled at the next available
+ * multiple of \ref interval.  For exmaple: If the task has an interval of 60 seconds and the task
+ * takes 70 seconds, the next invocation will happen at 120 seconds.
+ *
+ * \ref AST_SIP_SCHED_TASK_DELAY specifies that the next invocation of the task should start
+ * at \ref interval milliseconds after the current invocation has finished.
+ *
+ */
+struct ast_sip_sched_task *ast_sip_schedule_task(struct ast_taskprocessor *serializer,
+	int interval, ast_sip_task sip_task, char *name, void *task_data,
+	enum ast_sip_scheduler_task_flags flags);
+
+/*!
+ * \brief Cancels the next invocation of a task
+ * \since 13.9.0
+ *
+ * \param schtd The task structure pointer
+ * \retval 0 Success
+ * \retval -1 Failure
+ * \note Only cancels future invocations not the currently running invocation.
+ */
+int ast_sip_sched_task_cancel(struct ast_sip_sched_task *schtd);
+
+/*!
+ * \brief Cancels the next invocation of a task by name
+ * \since 13.9.0
+ *
+ * \param name The task name
+ * \retval 0 Success
+ * \retval -1 Failure
+ * \note Only cancels future invocations not the currently running invocation.
+ */
+int ast_sip_sched_task_cancel_by_name(const char *name);
+
+/*!
+ * \brief Gets the last start and end times of the task
+ * \since 13.9.0
+ *
+ * \param schtd The task structure pointer
+ * \param[out] when_queued Pointer to a timeval structure to contain the time when queued
+ * \param[out] last_start Pointer to a timeval structure to contain the time when last started
+ * \param[out] last_end Pointer to a timeval structure to contain the time when last ended
+ * \retval 0 Success
+ * \retval -1 Failure
+ * \note Any of the pointers can be NULL if you don't need them.
+ */
+int ast_sip_sched_task_get_times(struct ast_sip_sched_task *schtd,
+	struct timeval *when_queued, struct timeval *last_start, struct timeval *last_end);
+
+/*!
+ * \brief Gets the last start and end times of the task by name
+ * \since 13.9.0
+ *
+ * \param name The task name
+ * \param[out] when_queued Pointer to a timeval structure to contain the time when queued
+ * \param[out] last_start Pointer to a timeval structure to contain the time when last started
+ * \param[out] last_end Pointer to a timeval structure to contain the time when last ended
+ * \retval 0 Success
+ * \retval -1 Failure
+ * \note Any of the pointers can be NULL if you don't need them.
+ */
+int ast_sip_sched_task_get_times_by_name(const char *name,
+	struct timeval *when_queued, struct timeval *last_start, struct timeval *last_end);
+
+/*!
+ * \brief Gets the number of milliseconds until the next invocation
+ * \since 13.9.0
+ *
+ * \param schtd The task structure pointer
+ * \return The number of milliseconds until the next invocation or -1 if the task isn't scheduled
+ */
+int ast_sip_sched_task_get_next_run(struct ast_sip_sched_task *schtd);
+
+/*!
+ * \brief Gets the number of milliseconds until the next invocation
+ * \since 13.9.0
+ *
+ * \param name The task name
+ * \return The number of milliseconds until the next invocation or -1 if the task isn't scheduled
+ */
+int ast_sip_sched_task_get_next_run_by_name(const char *name);
+
+/*!
+ * \brief Checks if the task is currently running
+ * \since 13.9.0
+ *
+ * \param schtd The task structure pointer
+ * \retval 0 not running
+ * \retval 1 running
+ */
+int ast_sip_sched_is_task_running(struct ast_sip_sched_task *schtd);
+
+/*!
+ * \brief Checks if the task is currently running
+ * \since 13.9.0
+ *
+ * \param name The task name
+ * \retval 0 not running or not found
+ * \retval 1 running
+ */
+int ast_sip_sched_is_task_running_by_name(const char *name);
+
+/*!
+ * \brief Gets the task name
+ * \since 13.9.0
+ *
+ * \param schtd The task structure pointer
+ * \retval 0 success
+ * \retval 1 failure
+ */
+int ast_sip_sched_task_get_name(struct ast_sip_sched_task *schtd, char *name, size_t maxlen);
+
+/*!
+ *  @}
+ */
+
 /*!
  * \brief SIP body description
  *

res/res_pjsip.c

@@ -3636,11 +3636,7 @@ int ast_sip_push_task(struct ast_taskprocessor *serializer, int (*sip_task)(void
 		serializer = serializer_pool[pos];
 	}
 
-	if (serializer) {
+	return ast_taskprocessor_push(serializer, sip_task, task_data);
-		return ast_taskprocessor_push(serializer, sip_task, task_data);
-	} else {
-		return ast_threadpool_push(sip_threadpool, sip_task, task_data);
-	}
 }
 
 struct sync_task_data {
@@ -4158,6 +4154,11 @@ static int load_module(void)
 		goto error;
 	}
 
+	if (ast_sip_initialize_scheduler()) {
+		ast_log(LOG_ERROR, "Failed to start scheduler. Aborting load\n");
+		goto error;
+	}
+
 	/* Now load all the pjproject infrastructure. */
 	if (load_pjsip()) {
 		goto error;
@@ -4196,8 +4197,10 @@ static int load_module(void)
 	return AST_MODULE_LOAD_SUCCESS;
 
 error:
-	/* These functions all check for NULLs and are safe to call at any time */
 	unload_pjsip(NULL);
+
+	/* These functions all check for NULLs and are safe to call at any time */
+	ast_sip_destroy_scheduler();
 	serializer_pool_shutdown();
 	ast_threadpool_shutdown(sip_threadpool);
 
@@ -4228,7 +4231,7 @@ static int unload_module(void)
 	 * so we have to push the work to the threadpool to handle
 	 */
 	ast_sip_push_task_synchronous(NULL, unload_pjsip, NULL);
-
+	ast_sip_destroy_scheduler();
 	serializer_pool_shutdown();
 	ast_threadpool_shutdown(sip_threadpool);
 

res/res_pjsip/include/res_pjsip_private.h

@@ -313,4 +313,23 @@ struct ast_sip_contact_status *ast_res_pjsip_find_or_create_contact_status(const
  */
 int ast_sip_validate_uri_length(const char *uri);
 
+/*!
+ * \brief Initialize scheduler
+ * \since 13.9.0
+ *
+ * \retval -1 failure
+ * \retval 0 success
+ */
+int ast_sip_initialize_scheduler(void);
+
+/*!
+ * \internal
+ * \brief Destroy scheduler
+ * \since 13.9.0
+ *
+ * \retval -1 failure
+ * \retval 0 success
+ */
+int ast_sip_destroy_scheduler(void);
+
 #endif /* RES_PJSIP_PRIVATE_H_ */

res/res_pjsip/pjsip_scheduler.c

@@ -0,0 +1,495 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2016, Fairview 5 Engineering, LLC
+ *
+ * George Joseph <george.joseph@fairview5.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief res_pjsip Scheduler
+ *
+ * \author George Joseph <george.joseph@fairview5.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_REGISTER_FILE()
+
+#include "asterisk/res_pjsip.h"
+#include "include/res_pjsip_private.h"
+#include "asterisk/res_pjsip_cli.h"
+
+#define TASK_BUCKETS 53
+
+static struct ast_sched_context *scheduler_context;
+static struct ao2_container *tasks;
+static int task_count;
+
+struct ast_sip_sched_task {
+	/*! ast_sip_sched task id */
+	uint32_t task_id;
+	/*! ast_sched scheudler id */
+	int current_scheduler_id;
+	/*! task is currently running */
+	int is_running;
+	/*! task */
+	ast_sip_task task;
+	/*! task data */
+	void *task_data;
+	/*! reschedule interval in milliseconds */
+	int interval;
+	/*! the time the task was queued */
+	struct timeval when_queued;
+	/*! the last time the task was started */
+	struct timeval last_start;
+	/*! the last time the task was ended */
+	struct timeval last_end;
+	/*! times run */
+	int run_count;
+	/*! the task reschedule, cleanup and policy flags */
+	enum ast_sip_scheduler_task_flags flags;
+	/*! the serializer to be used (if any) */
+	struct ast_taskprocessor *serializer;
+	/* A name to be associated with the task */
+	char name[0];
+};
+
+AO2_STRING_FIELD_HASH_FN(ast_sip_sched_task, name);
+AO2_STRING_FIELD_CMP_FN(ast_sip_sched_task, name);
+AO2_STRING_FIELD_SORT_FN(ast_sip_sched_task, name);
+
+static int push_to_serializer(const void *data);
+
+/*
+ * This function is run in the context of the serializer.
+ * It runs the task with a simple call and reschedules based on the result.
+ */
+static int run_task(void *data)
+{
+	RAII_VAR(struct ast_sip_sched_task *, schtd, ao2_bump(data), ao2_cleanup);
+	int res;
+	int delay;
+
+	ao2_lock(schtd);
+	schtd->last_start = ast_tvnow();
+	schtd->is_running = 1;
+	schtd->run_count++;
+	ao2_unlock(schtd);
+
+	res = schtd->task(schtd->task_data);
+
+	ao2_lock(schtd);
+	schtd->is_running = 0;
+	schtd->last_end = ast_tvnow();
+
+	/*
+	 * Don't restart if the task returned 0 or if the interval
+	 * was set to 0 while the task was running
+	 */
+	if (!res || !schtd->interval) {
+		schtd->interval = 0;
+		ao2_unlock(schtd);
+		ao2_unlink(tasks, schtd);
+		return -1;
+	}
+
+	if (schtd->flags & AST_SIP_SCHED_TASK_VARIABLE) {
+		schtd->interval = res;
+	}
+
+	if (schtd->flags & AST_SIP_SCHED_TASK_DELAY) {
+		delay = schtd->interval;
+	} else {
+		delay = schtd->interval - (ast_tvdiff_ms(schtd->last_end, schtd->last_start) % schtd->interval);
+	}
+
+	schtd->current_scheduler_id = ast_sched_add(scheduler_context, delay, push_to_serializer, (const void *)schtd);
+	if (schtd->current_scheduler_id < 0) {
+		schtd->interval = 0;
+		ao2_unlock(schtd);
+		ao2_unlink(tasks, schtd);
+		return -1;
+	}
+
+	ao2_unlock(schtd);
+
+	return 0;
+}
+
+/*
+ * This function is run by the scheduler thread.  Its only job is to push the task
+ * to the serialize and return.  It returns 0 so it's not rescheduled.
+ */
+static int push_to_serializer(const void *data)
+{
+	struct ast_sip_sched_task *schtd = (struct ast_sip_sched_task *)data;
+
+	if (ast_sip_push_task(schtd->serializer, run_task, schtd)) {
+		ao2_ref(schtd, -1);
+	}
+
+	return 0;
+}
+
+int ast_sip_sched_task_cancel(struct ast_sip_sched_task *schtd)
+{
+	int res;
+
+	if (!ao2_ref_and_lock(schtd)) {
+		return -1;
+	}
+
+	if (schtd->current_scheduler_id < 0 || schtd->interval <= 0) {
+		ao2_unlock_and_unref(schtd);
+		return 0;
+	}
+
+	schtd->interval = 0;
+	ao2_unlock_and_unref(schtd);
+	ao2_unlink(tasks, schtd);
+	res = ast_sched_del(scheduler_context, schtd->current_scheduler_id);
+
+	return res;
+}
+
+int ast_sip_sched_task_cancel_by_name(const char *name)
+{
+	RAII_VAR(struct ast_sip_sched_task *, schtd, NULL, ao2_cleanup);
+
+	if (ast_strlen_zero(name)) {
+		return -1;
+	}
+
+	schtd = ao2_find(tasks, name, OBJ_SEARCH_KEY | OBJ_NOLOCK);
+	if (!schtd) {
+		return -1;
+	}
+
+	return ast_sip_sched_task_cancel(schtd);
+}
+
+
+int ast_sip_sched_task_get_times(struct ast_sip_sched_task *schtd,
+	struct timeval *queued, struct timeval *last_start, struct timeval *last_end)
+{
+	if (!ao2_ref_and_lock(schtd)) {
+		return -1;
+	}
+
+	if (queued) {
+		memcpy(queued, &schtd->when_queued, sizeof(struct timeval));
+	}
+	if (last_start) {
+		memcpy(last_start, &schtd->last_start, sizeof(struct timeval));
+	}
+	if (last_end) {
+		memcpy(last_end, &schtd->last_end, sizeof(struct timeval));
+	}
+
+	ao2_unlock_and_unref(schtd);
+
+	return 0;
+}
+
+int ast_sip_sched_task_get_times_by_name(const char *name,
+	struct timeval *queued, struct timeval *last_start, struct timeval *last_end)
+{
+	RAII_VAR(struct ast_sip_sched_task *, schtd, NULL, ao2_cleanup);
+
+	if (ast_strlen_zero(name)) {
+		return -1;
+	}
+
+	schtd = ao2_find(tasks, name, OBJ_SEARCH_KEY | OBJ_NOLOCK);
+	if (!schtd) {
+		return -1;
+	}
+
+	return ast_sip_sched_task_get_times(schtd, queued, last_start, last_end);
+}
+
+int ast_sip_sched_task_get_name(struct ast_sip_sched_task *schtd, char *name, size_t maxlen)
+{
+	if (maxlen <= 0) {
+		return -1;
+	}
+
+	if (!ao2_ref_and_lock(schtd)) {
+		return -1;
+	}
+
+	ast_copy_string(name, schtd->name, maxlen);
+
+	ao2_unlock_and_unref(schtd);
+
+	return 0;
+}
+
+int ast_sip_sched_task_get_next_run(struct ast_sip_sched_task *schtd)
+{
+	int delay;
+	struct timeval since_when;
+	struct timeval now;
+
+	if (!ao2_ref_and_lock(schtd)) {
+		return -1;
+	}
+
+	if (schtd->interval) {
+		delay = schtd->interval;
+		now = ast_tvnow();
+
+		if (schtd->flags & AST_SIP_SCHED_TASK_DELAY) {
+			since_when = schtd->is_running ? now : schtd->last_end;
+		} else {
+			since_when = schtd->last_start.tv_sec ? schtd->last_start : schtd->when_queued;
+		}
+
+		delay -= ast_tvdiff_ms(now, since_when);
+
+		delay = delay < 0 ? 0 : delay;
+	} else {
+		delay = -1;
+	}
+
+	ao2_unlock_and_unref(schtd);
+
+	return delay;
+}
+
+int ast_sip_sched_task_get_next_run_by_name(const char *name)
+{
+	RAII_VAR(struct ast_sip_sched_task *, schtd, NULL, ao2_cleanup);
+
+	if (ast_strlen_zero(name)) {
+		return -1;
+	}
+
+	schtd = ao2_find(tasks, name, OBJ_SEARCH_KEY | OBJ_NOLOCK);
+	if (!schtd) {
+		return -1;
+	}
+
+	return ast_sip_sched_task_get_next_run(schtd);
+}
+
+int ast_sip_sched_is_task_running(struct ast_sip_sched_task *schtd)
+{
+	if (!schtd) {
+		return 0;
+	}
+
+	return schtd->is_running;
+}
+
+int ast_sip_sched_is_task_running_by_name(const char *name)
+{
+	RAII_VAR(struct ast_sip_sched_task *, schtd, NULL, ao2_cleanup);
+
+	if (ast_strlen_zero(name)) {
+		return 0;
+	}
+
+	schtd = ao2_find(tasks, name, OBJ_SEARCH_KEY | OBJ_NOLOCK);
+	if (!schtd) {
+		return 0;
+	}
+
+	return schtd->is_running;
+}
+
+static void schtd_destructor(void *data)
+{
+	struct ast_sip_sched_task *schtd = data;
+
+	if (schtd->flags & AST_SIP_SCHED_TASK_DATA_AO2) {
+		/* release our own ref, then release the callers if asked to do so */
+		ao2_ref(schtd->task_data, (schtd->flags & AST_SIP_SCHED_TASK_DATA_FREE) ? -2 : -1);
+	} else if (schtd->task_data && (schtd->flags & AST_SIP_SCHED_TASK_DATA_FREE)) {
+		ast_free(schtd->task_data);
+	}
+}
+
+struct ast_sip_sched_task *ast_sip_schedule_task(struct ast_taskprocessor *serializer,
+	int interval, ast_sip_task sip_task, char *name, void *task_data, enum ast_sip_scheduler_task_flags flags)
+{
+#define ID_LEN 13 /* task_deadbeef */
+	struct ast_sip_sched_task *schtd;
+	int res;
+
+	if (interval < 0) {
+		return NULL;
+	}
+
+	schtd = ao2_alloc((sizeof(*schtd) + (!ast_strlen_zero(name) ? strlen(name) : ID_LEN) + 1), schtd_destructor);
+	if (!schtd) {
+		return NULL;
+	}
+
+	schtd->task_id = ast_atomic_fetchadd_int(&task_count, 1);
+	schtd->serializer = serializer;
+	schtd->task = sip_task;
+	if (!ast_strlen_zero(name)) {
+		strcpy(schtd->name, name); /* Safe */
+	} else {
+		sprintf(schtd->name, "task_%08x", schtd->task_id);
+	}
+	schtd->task_data = task_data;
+	schtd->flags = flags;
+	schtd->interval = interval;
+	schtd->when_queued = ast_tvnow();
+
+	if (flags & AST_SIP_SCHED_TASK_DATA_AO2) {
+		ao2_ref(task_data, +1);
+	}
+	res = ast_sched_add(scheduler_context, interval, push_to_serializer, (const void *)schtd);
+	if (res < 0) {
+		ao2_ref(schtd, -1);
+		return NULL;
+	} else {
+		schtd->current_scheduler_id = res;
+		ao2_link(tasks, schtd);
+	}
+
+	return schtd;
+#undef ID_LEN
+}
+
+static char *cli_show_tasks(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
+{
+	struct ao2_iterator i;
+	struct ast_sip_sched_task *schtd;
+	const char *log_format = ast_logger_get_dateformat();
+	struct ast_tm tm;
+	char queued[32];
+	char last_start[32];
+	char last_end[32];
+	int datelen;
+	struct timeval now = ast_tvnow();
+	const char *separator = "======================================";
+
+	switch (cmd) {
+	case CLI_INIT:
+		e->command = "pjsip show scheduled_tasks";
+		e->usage = "Usage: pjsip show scheduled_tasks\n"
+		            "      Show all scheduled tasks\n";
+		return NULL;
+	case CLI_GENERATE:
+		return NULL;
+	}
+
+	if (a->argc != 3) {
+		return CLI_SHOWUSAGE;
+	}
+
+	ast_localtime(&now, &tm, NULL);
+	datelen = ast_strftime(queued, sizeof(queued), log_format, &tm);
+
+	ast_cli(a->fd, "PJSIP Scheduled Tasks:\n\n");
+
+	ast_cli(a->fd, " %1$-24s %2$-8s %3$-9s %4$-7s  %6$-*5$s  %7$-*5$s  %8$-*5$s\n",
+		"Task Name", "Interval", "Times Run", "State",
+		datelen, "Queued", "Last Started", "Last Ended");
+
+	ast_cli(a->fd, " %1$-24.24s %2$-8.8s %3$-9.9s %4$-7.7s  %6$-*5$.*5$s  %7$-*5$.*5$s  %8$-*5$.*5$s\n",
+		separator, separator, separator, separator,
+		datelen, separator, separator, separator);
+
+
+	ao2_ref(tasks, +1);
+	ao2_rdlock(tasks);
+	i = ao2_iterator_init(tasks, 0);
+	while ((schtd = ao2_iterator_next(&i))) {
+
+		ast_localtime(&schtd->when_queued, &tm, NULL);
+		ast_strftime(queued, sizeof(queued), log_format, &tm);
+
+		if (ast_tvzero(schtd->last_start)) {
+			strcpy(last_start, "not yet started");
+		} else {
+			ast_localtime(&schtd->last_start, &tm, NULL);
+			ast_strftime(last_start, sizeof(last_start), log_format, &tm);
+		}
+
+		if (ast_tvzero(schtd->last_end)) {
+			if (ast_tvzero(schtd->last_start)) {
+				strcpy(last_end, "not yet started");
+			} else {
+				strcpy(last_end, "running");
+			}
+		} else {
+			ast_localtime(&schtd->last_end, &tm, NULL);
+			ast_strftime(last_end, sizeof(last_end), log_format, &tm);
+		}
+
+		ast_cli(a->fd, " %1$-24.24s %2$-8.3f %3$-9d %4$-7s  %6$-*5$s  %7$-*5$s  %8$-*5$s\n",
+			schtd->name,
+			schtd->interval / 1000.0,
+			schtd->run_count,
+			schtd->is_running ? "running" : "waiting",
+			datelen, queued, last_start, last_end);
+		ao2_cleanup(schtd);
+	}
+	ao2_iterator_destroy(&i);
+	ao2_unlock(tasks);
+	ao2_ref(tasks, -1);
+	ast_cli(a->fd, "\n");
+
+	return CLI_SUCCESS;
+}
+
+static struct ast_cli_entry cli_commands[] = {
+	AST_CLI_DEFINE(cli_show_tasks, "Show all scheduled tasks"),
+};
+
+int ast_sip_initialize_scheduler(void)
+{
+	if (!(scheduler_context = ast_sched_context_create())) {
+		ast_log(LOG_ERROR, "Failed to create scheduler. Aborting load\n");
+		return -1;
+	}
+
+	if (ast_sched_start_thread(scheduler_context)) {
+		ast_log(LOG_ERROR, "Failed to start scheduler. Aborting load\n");
+		ast_sched_context_destroy(scheduler_context);
+		return -1;
+	}
+
+	tasks = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_RWLOCK, AO2_CONTAINER_ALLOC_OPT_DUPS_REJECT,
+		TASK_BUCKETS, ast_sip_sched_task_hash_fn, ast_sip_sched_task_sort_fn, ast_sip_sched_task_cmp_fn);
+	if (!tasks) {
+		ast_log(LOG_ERROR, "Failed to allocate task container. Aborting load\n");
+		ast_sched_context_destroy(scheduler_context);
+		return -1;
+	}
+
+	ast_cli_register_multiple(cli_commands, ARRAY_LEN(cli_commands));
+
+	return 0;
+}
+
+int ast_sip_destroy_scheduler(void)
+{
+	ast_cli_unregister_multiple(cli_commands, ARRAY_LEN(cli_commands));
+
+	if (scheduler_context) {
+		ast_sched_context_destroy(scheduler_context);
+	}
+
+	ao2_cleanup(tasks);
+	tasks = NULL;
+
+	return 0;
+}

tests/test_res_pjsip_scheduler.c

@@ -0,0 +1,400 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2016, Fairview 5 Engineering, LLC
+ *
+ * George Joseph <george.joseph@fairview5.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*!
+ * \file
+ * \brief res_pjsip scheduler tests
+ *
+ * \author George Joseph <george.joseph@fairview5.com>
+ *
+ */
+
+/*** MODULEINFO
+	<depend>TEST_FRAMEWORK</depend>
+	<depend>res_pjsip</depend>
+	<support_level>core</support_level>
+ ***/
+
+#include "asterisk.h"
+
+ASTERISK_REGISTER_FILE()
+
+#include <pjsip.h>
+#include "asterisk/test.h"
+#include "asterisk/module.h"
+#include "asterisk/taskprocessor.h"
+#include "asterisk/res_pjsip.h"
+#include "asterisk/utils.h"
+
+#define CATEGORY "/res/res_pjsip/scheduler/"
+
+struct test_data {
+	ast_mutex_t lock;
+	ast_cond_t cond;
+	pthread_t tid;
+	struct timeval test_start;
+	struct timeval task_start;
+	struct timeval task_end;
+	int is_servant;
+	int interval;
+	int sleep;
+	int done;
+	struct ast_test *test;
+};
+
+#define S2U(x) (long int)(x * 1000 * 1000)
+#define M2U(x) (long int)(x * 1000)
+
+static int task_1(void *data)
+{
+	struct test_data *test = data;
+
+	test->done = 0;
+	test->task_start = ast_tvnow();
+	test->tid = pthread_self();
+	test->is_servant = ast_sip_thread_is_servant();
+	usleep(M2U(test->sleep));
+	test->task_end = ast_tvnow();
+
+	ast_mutex_lock(&test->lock);
+	test->done = 1;
+	ast_mutex_unlock(&test->lock);
+	ast_cond_signal(&test->cond);
+
+	return test->interval;
+}
+
+
+static void data_cleanup(void *data)
+{
+	struct test_data *test_data = data;
+	ast_mutex_destroy(&test_data->lock);
+	ast_cond_destroy(&test_data->cond);
+}
+
+#define waitfor(x) \
+{ \
+	ast_mutex_lock(&(x)->lock); \
+	while (!(x)->done) { \
+		ast_cond_wait(&(x)->cond, &(x)->lock); \
+	} \
+	(x)->done = 0; \
+	ast_mutex_unlock(&(x)->lock); \
+}
+
+static int scheduler(struct ast_test *test, int serialized)
+{
+	RAII_VAR(struct ast_taskprocessor *, tp1, NULL, ast_taskprocessor_unreference);
+	RAII_VAR(struct test_data *, test_data1, ao2_alloc(sizeof(*test_data1), data_cleanup), ao2_cleanup);
+	RAII_VAR(struct test_data *, test_data2, ao2_alloc(sizeof(*test_data2), data_cleanup), ao2_cleanup);
+	RAII_VAR(struct ast_sip_sched_task *, task1, NULL, ao2_cleanup);
+	RAII_VAR(struct ast_sip_sched_task *, task2, NULL, ao2_cleanup);
+	int duration;
+	int delay;
+	struct timeval task1_start;
+
+	ast_test_validate(test, test_data1 != NULL);
+	ast_test_validate(test, test_data2 != NULL);
+
+	test_data1->test = test;
+	test_data1->test_start = ast_tvnow();
+	test_data1->interval = 2000;
+	test_data1->sleep = 1000;
+	ast_mutex_init(&test_data1->lock);
+	ast_cond_init(&test_data1->cond, NULL);
+
+	test_data2->test = test;
+	test_data2->test_start = ast_tvnow();
+	test_data2->interval = 2000;
+	test_data2->sleep = 1000;
+	ast_mutex_init(&test_data2->lock);
+	ast_cond_init(&test_data2->cond, NULL);
+
+	if (serialized) {
+		ast_test_status_update(test, "This test will take about %3.1f seconds\n",
+			(test_data1->interval + test_data1->sleep + (MAX(test_data1->interval - test_data2->interval, 0)) + test_data2->sleep) / 1000.0);
+		tp1 = ast_sip_create_serializer("test-scheduler-serializer");
+		ast_test_validate(test, (tp1 != NULL));
+	} else {
+		ast_test_status_update(test, "This test will take about %3.1f seconds\n",
+			((MAX(test_data1->interval, test_data2->interval) + MAX(test_data1->sleep, test_data2->sleep)) / 1000.0));
+	}
+
+	task1 = ast_sip_schedule_task(tp1, test_data1->interval, task_1, NULL, test_data1, AST_SIP_SCHED_TASK_FIXED);
+	ast_test_validate(test, task1 != NULL);
+
+	task2 = ast_sip_schedule_task(tp1, test_data2->interval, task_1, NULL, test_data2, AST_SIP_SCHED_TASK_FIXED);
+	ast_test_validate(test, task2 != NULL);
+
+	waitfor(test_data1);
+	ast_sip_sched_task_cancel(task1);
+	ast_test_validate(test, test_data1->is_servant);
+
+	duration = ast_tvdiff_ms(test_data1->task_end, test_data1->test_start);
+	ast_test_validate(test, (duration > ((test_data1->interval + test_data1->sleep) * 0.9))
+		&& (duration < ((test_data1->interval + test_data1->sleep) * 1.1)));
+
+	ast_sip_sched_task_get_times(task1, NULL, &task1_start, NULL);
+	delay = ast_tvdiff_ms(task1_start, test_data1->test_start);
+	ast_test_validate(test, (delay > (test_data1->interval * 0.9)
+		&& (delay < (test_data1->interval * 1.1))));
+
+	waitfor(test_data2);
+	ast_sip_sched_task_cancel(task2);
+	ast_test_validate(test, test_data2->is_servant);
+
+	if (serialized) {
+		ast_test_validate(test, test_data1->tid == test_data2->tid);
+		ast_test_validate(test, ast_tvdiff_ms(test_data2->task_start, test_data1->task_end) >= 0);
+	} else {
+		ast_test_validate(test, test_data1->tid != test_data2->tid);
+	}
+
+	return AST_TEST_PASS;
+}
+
+AST_TEST_DEFINE(serialized_scheduler)
+{
+
+	switch (cmd) {
+	case TEST_INIT:
+		info->name = __func__;
+		info->category = CATEGORY;
+		info->summary = "Test res_pjsip serialized scheduler";
+		info->description = "Test res_pjsip serialized scheduler";
+		return AST_TEST_NOT_RUN;
+	case TEST_EXECUTE:
+		break;
+	}
+
+	return scheduler(test, 1);
+}
+
+AST_TEST_DEFINE(unserialized_scheduler)
+{
+
+	switch (cmd) {
+	case TEST_INIT:
+		info->name = __func__;
+		info->category = CATEGORY;
+		info->summary = "Test res_pjsip unserialized scheduler";
+		info->description = "Test res_pjsip unserialized scheduler";
+		return AST_TEST_NOT_RUN;
+	case TEST_EXECUTE:
+		break;
+	}
+
+	return scheduler(test, 0);
+}
+
+static int run_count;
+static int destruct_count;
+
+static int dummy_task(void *data)
+{
+	int *sleep = data;
+
+	usleep(M2U(*sleep));
+	run_count++;
+
+	return 0;
+}
+
+static void test_destructor(void *data)
+{
+	destruct_count++;
+}
+
+AST_TEST_DEFINE(scheduler_cleanup)
+{
+	RAII_VAR(int *, sleep, NULL, ao2_cleanup);
+	RAII_VAR(struct ast_sip_sched_task *, task, NULL, ao2_cleanup);
+	int interval;
+	int when;
+
+	switch (cmd) {
+	case TEST_INIT:
+		info->name = __func__;
+		info->category = CATEGORY;
+		info->summary = "Test res_pjsip scheduler cleanup";
+		info->description = "Test res_pjsip scheduler cleanup";
+		return AST_TEST_NOT_RUN;
+	case TEST_EXECUTE:
+		break;
+	}
+
+	destruct_count = 0;
+	interval = 1000;
+
+	sleep = ao2_alloc(sizeof(*sleep), test_destructor);
+	ast_test_validate(test, sleep != NULL);
+	*sleep = 500;
+
+	ast_test_status_update(test, "This test will take about %3.1f seconds\n",
+		((interval * 1.1) + *sleep) / 1000.0);
+
+	task = ast_sip_schedule_task(NULL, interval, dummy_task, "dummy", sleep,
+		AST_SIP_SCHED_TASK_DATA_AO2 | AST_SIP_SCHED_TASK_DATA_FREE);
+	ast_test_validate(test, task != NULL);
+	usleep(M2U(interval * 0.5));
+	when = ast_sip_sched_task_get_next_run(task);
+	ast_test_validate(test, (when > (interval * 0.4) && when < (interval * 0.6)));
+	usleep(M2U(interval * 0.6));
+	ast_test_validate(test, ast_sip_sched_is_task_running(task));
+
+	usleep(M2U(*sleep));
+
+	ast_test_validate(test, (ast_sip_sched_is_task_running(task) == 0));
+	when = ast_sip_sched_task_get_next_run(task);
+	ast_test_validate(test, (when < 0), res, error);
+	ast_test_validate(test, (ao2_ref(task, 0) == 1));
+	ao2_ref(task, -1);
+	task = NULL;
+	ast_test_validate(test, (destruct_count == 1));
+	sleep = NULL;
+
+	return AST_TEST_PASS;
+}
+
+AST_TEST_DEFINE(scheduler_cancel)
+{
+	RAII_VAR(int *, sleep, NULL, ao2_cleanup);
+	RAII_VAR(struct ast_sip_sched_task *, task, NULL, ao2_cleanup);
+	int interval;
+	int when;
+
+	switch (cmd) {
+	case TEST_INIT:
+		info->name = __func__;
+		info->category = CATEGORY;
+		info->summary = "Test res_pjsip scheduler cancel task";
+		info->description = "Test res_pjsip scheduler cancel task";
+		return AST_TEST_NOT_RUN;
+	case TEST_EXECUTE:
+		break;
+	}
+
+	destruct_count = 0;
+	interval = 1000;
+
+	sleep = ao2_alloc(sizeof(*sleep), test_destructor);
+	ast_test_validate(test, sleep != NULL);
+	*sleep = 500;
+
+	ast_test_status_update(test, "This test will take about %3.1f seconds\n",
+		(interval + *sleep) / 1000.0);
+
+	task = ast_sip_schedule_task(NULL, interval, dummy_task, "dummy", sleep, AST_SIP_SCHED_TASK_DATA_NO_CLEANUP);
+	ast_test_validate(test, task != NULL);
+
+	usleep(M2U(interval * 0.5));
+	when = ast_sip_sched_task_get_next_run_by_name("dummy");
+	ast_test_validate(test, (when > (interval * 0.4) && when < (interval * 0.6)));
+	ast_test_validate(test, !ast_sip_sched_is_task_running_by_name("dummy"));
+	ast_test_validate(test, ao2_ref(task, 0) == 2);
+
+	ast_sip_sched_task_cancel_by_name("dummy");
+
+	when = ast_sip_sched_task_get_next_run(task);
+	ast_test_validate(test, when < 0);
+
+	usleep(M2U(interval));
+	ast_test_validate(test, run_count == 0);
+	ast_test_validate(test, destruct_count == 0);
+	ast_test_validate(test, ao2_ref(task, 0) == 1);
+
+	return AST_TEST_PASS;
+}
+
+AST_TEST_DEFINE(scheduler_policy)
+{
+	RAII_VAR(struct test_data *, test_data1, ao2_alloc(sizeof(*test_data1), data_cleanup), ao2_cleanup);
+	RAII_VAR(struct ast_sip_sched_task *, task, NULL, ao2_cleanup);
+	int when;
+
+	switch (cmd) {
+	case TEST_INIT:
+		info->name = __func__;
+		info->category = CATEGORY;
+		info->summary = "Test res_pjsip scheduler cancel task";
+		info->description = "Test res_pjsip scheduler cancel task";
+		return AST_TEST_NOT_RUN;
+	case TEST_EXECUTE:
+		break;
+	}
+
+	ast_test_validate(test, test_data1 != NULL);
+
+	destruct_count = 0;
+	run_count = 0;
+	test_data1->test = test;
+	test_data1->test_start = ast_tvnow();
+	test_data1->interval = 1000;
+	test_data1->sleep = 500;
+	ast_mutex_init(&test_data1->lock);
+	ast_cond_init(&test_data1->cond, NULL);
+
+	ast_test_status_update(test, "This test will take about %3.1f seconds\n",
+		((test_data1->interval * 3) + test_data1->sleep) / 1000.0);
+
+	task = ast_sip_schedule_task(NULL, test_data1->interval, task_1, "test_1", test_data1,
+		AST_SIP_SCHED_TASK_DATA_NO_CLEANUP | AST_SIP_SCHED_TASK_PERIODIC);
+	ast_test_validate(test, task != NULL);
+
+	waitfor(test_data1);
+	when = ast_tvdiff_ms(test_data1->task_start, test_data1->test_start);
+	ast_test_validate(test, when > test_data1->interval * 0.9 && when < test_data1->interval * 1.1);
+
+	waitfor(test_data1);
+	when = ast_tvdiff_ms(test_data1->task_start, test_data1->test_start);
+	ast_test_validate(test, when > test_data1->interval * 2 * 0.9 && when < test_data1->interval * 2 * 1.1);
+
+	waitfor(test_data1);
+	when = ast_tvdiff_ms(test_data1->task_start, test_data1->test_start);
+	ast_test_validate(test, when > test_data1->interval * 3 * 0.9 && when < test_data1->interval * 3 * 1.1);
+
+	ast_sip_sched_task_cancel(task);
+	ao2_ref(task, -1);
+	task = NULL;
+
+	return AST_TEST_PASS;
+}
+
+static int load_module(void)
+{
+	CHECK_PJSIP_MODULE_LOADED();
+
+	AST_TEST_REGISTER(serialized_scheduler);
+	AST_TEST_REGISTER(unserialized_scheduler);
+	AST_TEST_REGISTER(scheduler_cleanup);
+	AST_TEST_REGISTER(scheduler_cancel);
+	AST_TEST_REGISTER(scheduler_policy);
+	return AST_MODULE_LOAD_SUCCESS;
+}
+
+static int unload_module(void)
+{
+	AST_TEST_UNREGISTER(scheduler_cancel);
+	AST_TEST_UNREGISTER(scheduler_cleanup);
+	AST_TEST_UNREGISTER(unserialized_scheduler);
+	AST_TEST_UNREGISTER(serialized_scheduler);
+	AST_TEST_UNREGISTER(scheduler_policy);
+	return 0;
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "res_pjsip scheduler test module");