dump the number of tasks in the queue every 30sec.

src/inc/tsched.h

@@ -32,6 +32,8 @@ typedef struct _sched_msg {
 
 void *taosInitScheduler(int queueSize, int numOfThreads, const char *label);
 
+void *taosInitSchedulerWithInfo(int queueSize, int numOfThreads, const char *label, void *tmrCtrl);
+
 int taosScheduleTask(void *qhandle, SSchedMsg *pMsg);
 
 void taosCleanUpScheduler(void *param);

src/util/src/tsched.c

@@ -16,6 +16,9 @@
 #include "os.h"
 #include "tlog.h"
 #include "tsched.h"
+#include "ttimer.h"
+
+#define DUMP_SCHEDULER_TIME_WINDOW 30000 //every 30sec, take a snap shot of task queue.
 
 typedef struct {
   char            label[16];
@@ -28,10 +31,13 @@ typedef struct {
   int             numOfThreads;
   pthread_t *     qthread;
   SSchedMsg *     queue;
+  
+  void*           pTmrCtrl;
+  void*           pTimer;
 } SSchedQueue;
 
-void *taosProcessSchedQueue(void *param);
-void taosCleanUpScheduler(void *param);
+static void *taosProcessSchedQueue(void *param);
+static void taosDumpSchedulerStatus(void *qhandle, void *tmrId);
 
 void *taosInitScheduler(int queueSize, int numOfThreads, const char *label) {
   pthread_attr_t attr;
@@ -96,6 +102,17 @@ _error:
   return NULL;
 }
 
+void *taosInitSchedulerWithInfo(int queueSize, int numOfThreads, const char *label, void *tmrCtrl) {
+  SSchedQueue* pSched = taosInitScheduler(queueSize, numOfThreads, label);
+  
+  if (tmrCtrl != NULL && pSched != NULL) {
+    pSched->pTmrCtrl = tmrCtrl;
+    taosTmrReset(taosDumpSchedulerStatus, DUMP_SCHEDULER_TIME_WINDOW, pSched, pSched->pTmrCtrl, &pSched->pTimer);
+  }
+  
+  return pSched;
+}
+
 void *taosProcessSchedQueue(void *param) {
   SSchedMsg    msg;
   SSchedQueue *pSched = (SSchedQueue *)param;
@@ -173,8 +190,27 @@ void taosCleanUpScheduler(void *param) {
   tsem_destroy(&pSched->emptySem);
   tsem_destroy(&pSched->fullSem);
   pthread_mutex_destroy(&pSched->queueMutex);
+  
+  if (pSched->pTimer) {
+    taosTmrStopA(&pSched->pTimer);
+  }
 
   free(pSched->queue);
   free(pSched->qthread);
   free(pSched); // fix memory leak
 }
+
+// for debug purpose, dump the scheduler status every 1min.
+void taosDumpSchedulerStatus(void *qhandle, void *tmrId) {
+  SSchedQueue *pSched = (SSchedQueue *)qhandle;
+  if (pSched == NULL || pSched->pTimer == NULL || pSched->pTimer != tmrId) {
+    return;
+  }
+  
+  int32_t size = ((pSched->emptySlot - pSched->fullSlot) + pSched->queueSize) % pSched->queueSize;
+  if (size > 0) {
+    pTrace("scheduler:%s, current tasks in queue:%d, task thread:%d", pSched->label, size, pSched->numOfThreads);
+  }
+  
+  taosTmrReset(taosDumpSchedulerStatus, DUMP_SCHEDULER_TIME_WINDOW, pSched, pSched->pTmrCtrl, &pSched->pTimer);
+}