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c488e4b928
Bugs fixed: - Bug #20791 valgrind errors in InnoDB Remove Valgrind warning of Bug #20791 : in new database creation, we read the doublewrite buffer magic number from uninitialized memory; the code worked because it was extremely unlikely that the memory would contain the magic number - Bug #21784 DROP TABLE crashes 5.1.12-pre if concurrent queries on the table remove update_thd() in ::store_lock() Also includes numerous coding style fixes, etc. See file-level comments for details.
92 lines
1.7 KiB
C
92 lines
1.7 KiB
C
#include "ut0wqueue.h"
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/********************************************************************
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Create a new work queue. */
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ib_wqueue_t*
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ib_wqueue_create(void)
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/*===================*/
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/* out: work queue */
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{
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ib_wqueue_t* wq = mem_alloc(sizeof(ib_wqueue_t));
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mutex_create(&wq->mutex, SYNC_WORK_QUEUE);
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wq->items = ib_list_create();
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wq->event = os_event_create(NULL);
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return(wq);
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}
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/********************************************************************
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Free a work queue. */
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void
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ib_wqueue_free(
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/*===========*/
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ib_wqueue_t* wq) /* in: work queue */
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{
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ut_a(!ib_list_get_first(wq->items));
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mutex_free(&wq->mutex);
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ib_list_free(wq->items);
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os_event_free(wq->event);
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mem_free(wq);
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}
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/********************************************************************
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Add a work item to the queue. */
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void
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ib_wqueue_add(
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/*==========*/
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ib_wqueue_t* wq, /* in: work queue */
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void* item, /* in: work item */
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mem_heap_t* heap) /* in: memory heap to use for allocating the
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list node */
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{
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mutex_enter(&wq->mutex);
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ib_list_add_last(wq->items, item, heap);
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os_event_set(wq->event);
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mutex_exit(&wq->mutex);
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}
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/********************************************************************
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Wait for a work item to appear in the queue. */
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void*
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ib_wqueue_wait(
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/* out: work item */
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ib_wqueue_t* wq) /* in: work queue */
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{
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ib_list_node_t* node;
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for (;;) {
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os_event_wait(wq->event);
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mutex_enter(&wq->mutex);
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node = ib_list_get_first(wq->items);
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if (node) {
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ib_list_remove(wq->items, node);
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if (!ib_list_get_first(wq->items)) {
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/* We must reset the event when the list
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gets emptied. */
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os_event_reset(wq->event);
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}
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break;
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}
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mutex_exit(&wq->mutex);
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}
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mutex_exit(&wq->mutex);
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return(node->data);
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}
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