Ticket 49435 - Fix NS race condition on loaded test systems

Bug Description:  During a test run, on a heavily loaded systems
some events would time out before they could occur correctly.

Fix Description:  Change the structure of events to mitigate
a deref performance hit, and add a ns_job_wait conditional
that allows blocking on a job to complete so that tests do not
require time based checks.

https://pagure.io/389-ds-base/issue/49435

Author: wibrown

Review by: mreynolds (Thanks!)

src/nunc-stans/include/nunc-stans.h

@@ -77,6 +77,10 @@ typedef enum _ns_result_t {
      * This occurs when a lower level OS issue occurs, generally thread related.
      */
     NS_THREAD_FAILURE = 5,
+    /**
+     * The job is being deleted
+     */
+    NS_DELETING = 6,
 } ns_result_t;
 
 /**
@@ -836,6 +840,14 @@ ns_job_type_t ns_job_get_output_type(struct ns_job_t *job);
  */
 ns_result_t ns_job_set_done_cb(struct ns_job_t *job, ns_job_func_t func);
 
+/**
+ * Block until a job is completed. This returns the next state of the job as as a return.
+ *
+ * \param job The job to set the callback for.
+ * \retval ns_job_state_t The next state the job will move to. IE, WAITING, DELETED, ARMED.
+ */
+ns_result_t ns_job_wait(struct ns_job_t *job);
+
 /**
  * Creates a new thread pool
  *

src/nunc-stans/ns/ns_event_fw.h

@@ -80,7 +80,8 @@ typedef enum _ns_job_state {
    interface between the app/thread pool/event framework */
 typedef struct ns_job_t
 {
-    pthread_mutex_t *monitor;
+    pthread_mutex_t monitor;
+    pthread_cond_t notify;
     struct ns_thrpool_t *tp;
     ns_job_func_t func;
     struct ns_job_data_t *data;