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Code Issues Releases Wiki Activity

The non-threaded version does a better job avoiding starvation.

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This commit is contained in:
Brian Wellington
2000-08-30 23:47:16 +00:00
parent 2310b7964d
commit 5a842a6fc3
3 changed files with 51 additions and 21 deletions
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27
lib/isc/task.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: task.c,v 1.73 2000/08/29 22:55:57 bwelling Exp $ */
/* $Id: task.c,v 1.74 2000/08/30 23:47:14 bwelling Exp $ */
/*
* Principal Author: Bob Halley
@@ -121,6 +121,7 @@ struct isc_taskmgr {
#endif
};
#define DEFAULT_TASKMGR_QUANTUM 10
#define DEFAULT_DEFAULT_QUANTUM 5
#define FINISHED(m) ((m)->exiting && EMPTY((m)->tasks))
@@ -717,6 +718,9 @@ isc_task_gettag(isc_task_t *task) {
static void
dispatch(isc_taskmgr_t *manager) {
isc_task_t *task;
#ifndef ISC_PLATFORM_USETHREADS
unsigned int total_dispatch_count = 0;
#endif
REQUIRE(VALID_MANAGER(manager));
@@ -771,10 +775,8 @@ dispatch(isc_taskmgr_t *manager) {
*/
LOCK(&manager->lock);
#ifndef ISC_PLATFORM_USETHREADS
while (!EMPTY(manager->ready_tasks) && !FINISHED(manager)) {
#else
while (!FINISHED(manager)) {
#ifdef ISC_PLATFORM_USETHREADS
/*
* For reasons similar to those given in the comment in
* isc_task_send() above, it is safe for us to dequeue
@@ -787,6 +789,10 @@ dispatch(isc_taskmgr_t *manager) {
WAIT(&manager->work_available, &manager->lock);
XTHREADTRACE("awake");
}
#else
if (total_dispatch_count >= DEFAULT_TASKMGR_QUANTUM ||
EMPTY(manager->ready_tasks))
break;
#endif
XTHREADTRACE("working");
@@ -827,6 +833,9 @@ dispatch(isc_taskmgr_t *manager) {
LOCK(&task->lock);
}
dispatch_count++;
#ifndef ISC_PLATFORM_USETHREADS
total_dispatch_count++;
#endif
}
if (task->references == 0 &&
@@ -1136,7 +1145,8 @@ isc_taskmgr_destroy(isc_taskmgr_t **managerp) {
* Dispatch the shutdown events.
*/
UNLOCK(&manager->lock);
isc__taskmgr_dispatch();
while (isc__taskmgr_ready())
(void)isc__taskmgr_dispatch();
#endif
manager_free(manager);
@@ -1145,6 +1155,13 @@ isc_taskmgr_destroy(isc_taskmgr_t **managerp) {
}
#ifndef ISC_PLATFORM_USETHREADS
isc_boolean_t
isc__taskmgr_ready(void) {
if (taskmgr == NULL)
return (ISC_FALSE);
return (ISC_TF(!ISC_LIST_EMPTY(taskmgr->ready_tasks)));
}
isc_result_t
isc__taskmgr_dispatch(void) {
isc_taskmgr_t *manager = taskmgr;