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Support TQ_FRONT flag used by taskq_dispatch() 

Allow taskq_dispatch() to insert work items at the head of the
queue instead of just the tail by passing the TQ_FRONT flag.
This commit is contained in:
Brian Behlendorf 2010-06-11 14:53:23 -07:00
parent 32c6147dee
commit eb12b3782c
2 changed files with 9 additions and 1 deletions
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2
include/sys/taskq.h
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@ -39,6 +39,7 @@
#define TASKQ_CPR_SAFE 0x00000002
#define TASKQ_DYNAMIC 0x00000004
#define TASKQ_THREADS_CPU_PCT 0x00000008
#define TASKQ_DC_BATCH 0x00000010
typedef unsigned long taskqid_t;
typedef void (task_func_t)(void *);
@ -53,6 +54,7 @@ typedef void (task_func_t)(void *);
#define TQ_NOQUEUE 0x01000000
#define TQ_NOALLOC 0x02000000
#define TQ_NEW 0x04000000
#define TQ_FRONT 0x08000000
#define TQ_ACTIVE 0x80000000
typedef struct taskq {

8
module/spl/spl-taskq.c
View File

@ -274,7 +274,13 @@ __taskq_dispatch(taskq_t *tq, task_func_t func, void *arg, uint_t flags)
GOTO(out, rc = 0);
spin_lock(&t->t_lock);
list_add_tail(&t->t_list, &tq->tq_pend_list);
/* Queue to the head instead of the tail */
if (flags & TQ_FRONT)
list_add(&t->t_list, &tq->tq_pend_list);
else
list_add_tail(&t->t_list, &tq->tq_pend_list);
t->t_id = rc = tq->tq_next_id;
tq->tq_next_id++;
t->t_func = func;