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114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/******************************************************
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Server query execution
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(c) 1996 Innobase Oy
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Created 6/5/1996 Heikki Tuuri
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*******************************************************/
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#include "srv0que.h"
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#include "srv0srv.h"
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#include "sync0sync.h"
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#include "os0thread.h"
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#include "usr0sess.h"
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#include "que0que.h"
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/**************************************************************************
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Checks if there is work to do in the server task queue. If there is, the
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thread starts processing a task. Before leaving, it again checks the task
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queue and picks a new task if any exists. This is called by a SRV_WORKER
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thread. */
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void
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srv_que_task_queue_check(void)
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/*==========================*/
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{
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que_thr_t* thr;
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for (;;) {
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mutex_enter(&kernel_mutex);
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thr = UT_LIST_GET_FIRST(srv_sys->tasks);
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if (thr == NULL) {
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mutex_exit(&kernel_mutex);
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return;
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}
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UT_LIST_REMOVE(queue, srv_sys->tasks, thr);
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mutex_exit(&kernel_mutex);
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que_run_threads(thr);
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}
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}
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/**************************************************************************
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Performs round-robin on the server tasks. This is called by a SRV_WORKER
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thread every second or so. */
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que_thr_t*
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srv_que_round_robin(
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/*================*/
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/* out: the new (may be == thr) query thread
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to run */
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que_thr_t* thr) /* in: query thread */
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{
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que_thr_t* new_thr;
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ut_ad(thr);
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ut_ad(thr->state == QUE_THR_RUNNING);
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mutex_enter(&kernel_mutex);
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UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
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new_thr = UT_LIST_GET_FIRST(srv_sys->tasks);
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mutex_exit(&kernel_mutex);
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return(new_thr);
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}
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/**************************************************************************
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Enqueues a task to server task queue and releases a worker thread, if there
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is a suspended one. */
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void
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srv_que_task_enqueue_low(
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/*=====================*/
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que_thr_t* thr) /* in: query thread */
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{
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ut_ad(thr);
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#ifdef UNIV_SYNC_DEBUG
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ut_ad(mutex_own(&kernel_mutex));
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#endif /* UNIV_SYNC_DEBUG */
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UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
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srv_release_threads(SRV_WORKER, 1);
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}
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/**************************************************************************
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Enqueues a task to server task queue and releases a worker thread, if there
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is a suspended one. */
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void
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srv_que_task_enqueue(
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/*=================*/
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que_thr_t* thr) /* in: query thread */
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{
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ut_ad(thr);
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ut_a(0); /* Under MySQL this is never called */
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mutex_enter(&kernel_mutex);
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srv_que_task_enqueue_low(thr);
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mutex_exit(&kernel_mutex);
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}
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