srv0que.c:

  Revert Marko's untested changeset 1.1844.1.6 to the stable 4.0 version; stable 4.0 must NOT BE modified except in case of bugs
srv0que.c, srv0que.h:
  new file

innobase/include/srv0que.h

+/******************************************************
+Server query execution
+
+(c) 1996 Innobase Oy
+
+Created 6/5/1996 Heikki Tuuri
+*******************************************************/
+
+
+#ifndef srv0que_h
+#define srv0que_h
+
+#include "univ.i"
+#include "que0types.h"
+
+/**************************************************************************
+Checks if there is work to do in the server task queue. If there is, the
+thread starts processing a task. Before leaving, it again checks the task
+queue and picks a new task if any exists. This is called by a SRV_WORKER
+thread. */
+
+void
+srv_que_task_queue_check(void);
+/*==========================*/
+/**************************************************************************
+Performs round-robin on the server tasks. This is called by a SRV_WORKER
+thread every second or so. */
+
+que_thr_t*
+srv_que_round_robin(
+/*================*/
+				/* out: the new (may be == thr) query thread
+				to run */
+	que_thr_t*	thr);	/* in: query thread */
+/**************************************************************************
+Enqueues a task to server task queue and releases a worker thread, if
+there exists one suspended. */
+
+void
+srv_que_task_enqueue(
+/*=================*/
+	que_thr_t*	thr);	/* in: query thread */
+/**************************************************************************
+Enqueues a task to server task queue and releases a worker thread, if
+there exists one suspended. */
+
+void
+srv_que_task_enqueue_low(
+/*=====================*/
+	que_thr_t*	thr);	/* in: query thread */
+
+#endif
+

innobase/srv/srv0que.c

+/******************************************************
+Server query execution
+
+(c) 1996 Innobase Oy
+
+Created 6/5/1996 Heikki Tuuri
+*******************************************************/
+
+#include "srv0que.h"
+
+#include "srv0srv.h"
+#include "sync0sync.h"
+#include "os0thread.h"
+#include "usr0sess.h"
+#include "que0que.h"
+
+/**************************************************************************
+Checks if there is work to do in the server task queue. If there is, the
+thread starts processing a task. Before leaving, it again checks the task
+queue and picks a new task if any exists. This is called by a SRV_WORKER
+thread. */
+
+void
+srv_que_task_queue_check(void)
+/*==========================*/
+{
+	que_thr_t*	thr;
+
+	for (;;) {
+		mutex_enter(&kernel_mutex);
+
+		thr = UT_LIST_GET_FIRST(srv_sys->tasks);
+
+		if (thr == NULL) {
+			mutex_exit(&kernel_mutex);
+
+			return;
+		}
+
+		UT_LIST_REMOVE(queue, srv_sys->tasks, thr);
+		
+		mutex_exit(&kernel_mutex);
+
+		que_run_threads(thr);
+	}
+}
+
+/**************************************************************************
+Performs round-robin on the server tasks. This is called by a SRV_WORKER
+thread every second or so. */
+
+que_thr_t*
+srv_que_round_robin(
+/*================*/
+				/* out: the new (may be == thr) query thread
+				to run */
+	que_thr_t*	thr)	/* in: query thread */
+{
+	que_thr_t*	new_thr;
+
+	ut_ad(thr);
+	ut_ad(thr->state == QUE_THR_RUNNING);
+
+	mutex_enter(&kernel_mutex);
+	
+	UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
+
+	new_thr = UT_LIST_GET_FIRST(srv_sys->tasks);
+		
+	mutex_exit(&kernel_mutex);
+
+	return(new_thr);
+}
+
+/**************************************************************************
+Enqueues a task to server task queue and releases a worker thread, if there
+is a suspended one. */
+
+void
+srv_que_task_enqueue_low(
+/*=====================*/
+	que_thr_t*	thr)	/* in: query thread */
+{
+	ut_ad(thr);
+
+#ifdef UNIV_SYNC_DEBUG
+	ut_ad(mutex_own(&kernel_mutex));
+#endif /* UNIV_SYNC_DEBUG */
+
+	UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
+
+	srv_release_threads(SRV_WORKER, 1);
+}
+
+/**************************************************************************
+Enqueues a task to server task queue and releases a worker thread, if there
+is a suspended one. */
+
+void
+srv_que_task_enqueue(
+/*=================*/
+	que_thr_t*	thr)	/* in: query thread */
+{
+	ut_ad(thr);
+
+	mutex_enter(&kernel_mutex);
+	
+	srv_que_task_enqueue_low(thr);
+	
+	mutex_exit(&kernel_mutex);
+}