/*
* Bacula job queue routines.
*
+ * This code consists of three queues, the waiting_jobs
+ * queue, where jobs are initially queued, the ready_jobs
+ * queue, where jobs are placed when all the resources are
+ * allocated and they can immediately be run, and the
+ * running queue where jobs are placed when they are
+ * running.
+ *
* Kern Sibbald, July MMIII
*
* Version $Id$
* adapted from "Programming with POSIX Threads", by
* David R. Butenhof
*
- * Example:
- *
- * static jobq_t jq; define job queue
- *
- * Initialize queue
- * if ((stat = jobq_init(&jq, max_workers, job_thread)) != 0) {
- * Emsg1(M_ABORT, 0, "Could not init job work queue: ERR=%s\n", strerror(errno));
- * }
- *
- * Add an item to the queue
- * if ((stat = jobq_add(&jq, jcr)) != 0) {
- * Emsg1(M_ABORT, 0, "Could not add job to queue: ERR=%s\n", strerror(errno));
- * }
- *
- * Terminate the queue
- * jobq_destroy(jobq_t *jq);
- *
*/
/*
Copyright (C) 2000-2003 Kern Sibbald and John Walker
#include "bacula.h"
#include "dird.h"
+#ifdef JOB_QUEUE
+
/* Forward referenced functions */
static void *jobq_server(void *arg);
+static int start_server(jobq_t *jq);
/*
* Initialize a job queue
jq->idle_workers = 0; /* no idle threads */
jq->engine = engine; /* routine to run */
jq->valid = JOBQ_VALID;
- jq->list.init(item, &item->link);
+ /* Initialize the job queues */
+ jq->waiting_jobs = new dlist(item, &item->link);
+ jq->running_jobs = new dlist(item, &item->link);
+ jq->ready_jobs = new dlist(item, &item->link);
return 0;
}
stat = pthread_mutex_destroy(&jq->mutex);
stat1 = pthread_cond_destroy(&jq->work);
stat2 = pthread_attr_destroy(&jq->attr);
- jq->list.destroy();
+ delete jq->waiting_jobs;
+ delete jq->running_jobs;
+ delete jq->ready_jobs;
return (stat != 0 ? stat : (stat1 != 0 ? stat1 : stat2));
}
+struct wait_pkt {
+ JCR *jcr;
+ jobq_t *jq;
+};
+
+/*
+ * Wait until schedule time arrives before starting
+ */
+static void *sched_wait(void *arg)
+{
+ JCR *jcr = ((wait_pkt *)arg)->jcr;
+ jobq_t *jq = ((wait_pkt *)arg)->jq;
+
+ Dmsg0(100, "Enter sched_wait.\n");
+ free(arg);
+ time_t wtime = jcr->sched_time - time(NULL);
+ /* Wait until scheduled time arrives */
+ if (wtime > 0 && verbose) {
+ Jmsg(jcr, M_INFO, 0, _("Job %s waiting %d seconds for scheduled start time.\n"),
+ jcr->Job, wtime);
+ set_jcr_job_status(jcr, JS_WaitStartTime);
+ }
+ /* Check every 30 seconds if canceled */
+ while (wtime > 0) {
+ Dmsg2(100, "Waiting on sched time, jobid=%d secs=%d\n", jcr->JobId, wtime);
+ if (wtime > 30) {
+ wtime = 30;
+ }
+ bmicrosleep(wtime, 0);
+ if (job_canceled(jcr)) {
+ break;
+ }
+ wtime = jcr->sched_time - time(NULL);
+ }
+ jobq_add(jq, jcr);
+ Dmsg0(100, "Exit sched_wait\n");
+ return NULL;
+}
+
/*
* Add a job to the queue
{
int stat;
jobq_item_t *item, *li;
- pthread_t id;
bool inserted = false;
+ time_t wtime = jcr->sched_time - time(NULL);
+ pthread_t id;
+ wait_pkt *sched_pkt;
- Dmsg0(200, "jobq_add\n");
+
+ Dmsg1(100, "jobq_add jobid=%d\n", jcr->JobId);
if (jq->valid != JOBQ_VALID) {
return EINVAL;
}
- if ((item = (jobq_item_t *)malloc(sizeof(jobq_item_t))) == NULL) {
- return ENOMEM;
+ if (!job_canceled(jcr) && wtime > 0) {
+ set_thread_concurrency(jq->max_workers + 2);
+ sched_pkt = (wait_pkt *)malloc(sizeof(wait_pkt));
+ sched_pkt->jcr = jcr;
+ sched_pkt->jq = jq;
+ if ((stat = pthread_create(&id, &jq->attr, sched_wait, (void *)sched_pkt)) != 0) {
+ return stat;
+ }
}
- item->jcr = jcr;
+
if ((stat = pthread_mutex_lock(&jq->mutex)) != 0) {
- free(item);
return stat;
}
- Dmsg0(200, "add item to queue\n");
- for (li=NULL; (li=(jobq_item_t *)jq->list.next(li)); ) {
- if (li->jcr->JobPriority < jcr->JobPriority) {
- jq->list.insert_before(item, li);
- inserted = true;
- }
- }
- if (!inserted) {
- jq->list.append(item);
+ if ((item = (jobq_item_t *)malloc(sizeof(jobq_item_t))) == NULL) {
+ return ENOMEM;
}
+ item->jcr = jcr;
- /* if any threads are idle, wake one */
- if (jq->idle_workers > 0) {
- Dmsg0(200, "Signal worker\n");
- if ((stat = pthread_cond_signal(&jq->work)) != 0) {
- pthread_mutex_unlock(&jq->mutex);
- return stat;
+ if (job_canceled(jcr)) {
+ /* Add job to ready queue so that it is canceled quickly */
+ jq->ready_jobs->prepend(item);
+ Dmsg1(100, "Prepended job=%d to ready queue\n", jcr->JobId);
+ } else {
+ /* Add this job to the wait queue in priority sorted order */
+ for (li=NULL; (li=(jobq_item_t *)jq->waiting_jobs->next(li)); ) {
+ Dmsg2(100, "waiting item jobid=%d priority=%d\n",
+ li->jcr->JobId, li->jcr->JobPriority);
+ if (li->jcr->JobPriority > jcr->JobPriority) {
+ jq->waiting_jobs->insert_before(item, li);
+ Dmsg2(100, "insert_before jobid=%d before %d\n",
+ li->jcr->JobId, jcr->JobId);
+ inserted = true;
+ break;
+ }
}
- } else if (jq->num_workers < jq->max_workers) {
- Dmsg0(200, "Create worker thread\n");
- /* No idle threads so create a new one */
- set_thread_concurrency(jq->max_workers + 1);
- if ((stat = pthread_create(&id, &jq->attr, jobq_server, (void *)jq)) != 0) {
- pthread_mutex_unlock(&jq->mutex);
- return stat;
+ /* If not jobs in wait queue, append it */
+ if (!inserted) {
+ jq->waiting_jobs->append(item);
+ Dmsg1(100, "Appended item jobid=%d\n", jcr->JobId);
}
- jq->num_workers++;
}
- pthread_mutex_unlock(&jq->mutex);
- Dmsg0(200, "Return jobq_add\n");
+
+ stat = start_server(jq);
+
+ if (stat == 0) {
+ pthread_mutex_unlock(&jq->mutex);
+ }
+ Dmsg0(100, "Return jobq_add\n");
return stat;
}
{
int stat;
bool found = false;
- pthread_t id;
jobq_item_t *item;
- Dmsg0(200, "jobq_remove\n");
+ Dmsg1(100, "jobq_remove jobid=%d\n", jcr->JobId);
if (jq->valid != JOBQ_VALID) {
return EINVAL;
}
return stat;
}
- for (item=NULL; (item=(jobq_item_t *)jq->list.next(item)); ) {
+ for (item=NULL; (item=(jobq_item_t *)jq->waiting_jobs->next(item)); ) {
if (jcr == item->jcr) {
found = true;
break;
}
/* Move item to be the first on the list */
- jq->list.remove(item);
- jq->list.prepend(item);
+ jq->waiting_jobs->remove(item);
+ jq->ready_jobs->prepend(item);
+ stat = start_server(jq);
+ if (stat != 0) {
+ return stat;
+ }
+ pthread_mutex_unlock(&jq->mutex);
+ Dmsg0(100, "Return jobq_remove\n");
+ return stat;
+}
+
+
+/*
+ * Start the server thread
+ */
+static int start_server(jobq_t *jq)
+{
+ int stat = 0;
+ pthread_t id;
+
/* if any threads are idle, wake one */
if (jq->idle_workers > 0) {
- Dmsg0(200, "Signal worker\n");
+ Dmsg0(100, "Signal worker to wake up\n");
if ((stat = pthread_cond_signal(&jq->work)) != 0) {
pthread_mutex_unlock(&jq->mutex);
return stat;
}
- } else {
- Dmsg0(200, "Create worker thread\n");
+ } else if (jq->num_workers < jq->max_workers) {
+ Dmsg0(100, "Create worker thread\n");
/* No idle threads so create a new one */
set_thread_concurrency(jq->max_workers + 1);
if ((stat = pthread_create(&id, &jq->attr, jobq_server, (void *)jq)) != 0) {
}
jq->num_workers++;
}
- pthread_mutex_unlock(&jq->mutex);
- Dmsg0(200, "Return jobq_remove\n");
return stat;
}
jobq_item_t *je; /* job entry in queue */
int stat;
bool timedout;
+ bool work = true;
- Dmsg0(200, "Start jobq_server\n");
+ Dmsg0(100, "Start jobq_server\n");
if ((stat = pthread_mutex_lock(&jq->mutex)) != 0) {
return NULL;
}
struct timeval tv;
struct timezone tz;
- Dmsg0(200, "Top of for loop\n");
+ Dmsg0(100, "Top of for loop\n");
timedout = false;
- Dmsg0(200, "gettimeofday()\n");
+ Dmsg0(100, "gettimeofday()\n");
gettimeofday(&tv, &tz);
timeout.tv_nsec = 0;
- timeout.tv_sec = tv.tv_sec + 2;
+ timeout.tv_sec = tv.tv_sec + 4;
- while (jq->list.empty() && !jq->quit) {
+ while (!work && !jq->quit) {
/*
- * Wait 2 seconds, then if no more work, exit
+ * Wait 4 seconds, then if no more work, exit
*/
Dmsg0(200, "pthread_cond_timedwait()\n");
stat = pthread_cond_timedwait(&jq->work, &jq->mutex, &timeout);
- Dmsg1(200, "timedwait=%d\n", stat);
+ Dmsg1(100, "timedwait=%d\n", stat);
if (stat == ETIMEDOUT) {
timedout = true;
break;
} else if (stat != 0) {
/* This shouldn't happen */
- Dmsg0(200, "This shouldn't happen\n");
+ Dmsg0(100, "This shouldn't happen\n");
jq->num_workers--;
pthread_mutex_unlock(&jq->mutex);
return NULL;
}
}
- je = (jobq_item_t *)jq->list.first();
- if (je != NULL) {
- jq->list.remove(je);
+ /*
+ * If anything is in the ready queue, run it
+ */
+ Dmsg0(100, "Checking ready queue.\n");
+ while (!jq->ready_jobs->empty() && !jq->quit) {
+ je = (jobq_item_t *)jq->ready_jobs->first();
+ jq->ready_jobs->remove(je);
+ if (!jq->ready_jobs->empty()) {
+ Dmsg0(100, "ready queue not empty start server\n");
+ if (start_server(jq) != 0) {
+ return NULL;
+ }
+ }
+ jq->running_jobs->append(je);
+ Dmsg1(100, "Took jobid=%d from ready and appended to run\n", je->jcr->JobId);
if ((stat = pthread_mutex_unlock(&jq->mutex)) != 0) {
return NULL;
}
/* Call user's routine here */
- Dmsg0(200, "Calling user engine.\n");
+ Dmsg1(100, "Calling user engine for jobid=%d\n", je->jcr->JobId);
jq->engine(je->jcr);
- Dmsg0(200, "Back from user engine.\n");
- free(je); /* release job entry */
- Dmsg0(200, "relock mutex\n");
+ Dmsg1(100, "Back from user engine jobid=%d.\n", je->jcr->JobId);
if ((stat = pthread_mutex_lock(&jq->mutex)) != 0) {
+ free(je); /* release job entry */
return NULL;
}
Dmsg0(200, "Done lock mutex\n");
+ jq->running_jobs->remove(je);
+ /*
+ * Release locks if acquired. Note, they will not have
+ * been acquired for jobs canceled before they were
+ * put into the ready queue.
+ */
+ if (je->jcr->acquired_resource_locks) {
+ je->jcr->store->NumConcurrentJobs--;
+ je->jcr->client->NumConcurrentJobs--;
+ je->jcr->job->NumConcurrentJobs--;
+ }
+ free_jcr(je->jcr);
+ free(je); /* release job entry */
}
/*
- * If no more work request, and we are asked to quit, then do it
+ * If any job in the wait queue can be run,
+ * move it to the ready queue
+ */
+ Dmsg0(100, "Done check ready, now check wait queue.\n");
+ while (!jq->waiting_jobs->empty() && !jq->quit) {
+ int Priority;
+ je = (jobq_item_t *)jq->waiting_jobs->first();
+ jobq_item_t *re = (jobq_item_t *)jq->running_jobs->first();
+ if (re) {
+ Priority = re->jcr->JobPriority;
+ Dmsg1(100, "Set Run pri=%d\n", Priority);
+ } else {
+ Priority = je->jcr->JobPriority;
+ Dmsg1(100, "Set Job pri=%d\n", Priority);
+ }
+ /*
+ * Acquire locks
+ */
+ for ( ; je; ) {
+ JCR *jcr = je->jcr;
+ jobq_item_t *jn = (jobq_item_t *)jq->waiting_jobs->next(je);
+ Dmsg3(100, "Examining Job=%d JobPri=%d want Pri=%d\n",
+ jcr->JobId, jcr->JobPriority, Priority);
+ /* Take only jobs of correct Priority */
+ if (jcr->JobPriority != Priority) {
+ set_jcr_job_status(jcr, JS_WaitPriority);
+ break;
+ }
+ if (jcr->store->NumConcurrentJobs < jcr->store->MaxConcurrentJobs) {
+ jcr->store->NumConcurrentJobs++;
+ } else {
+ set_jcr_job_status(jcr, JS_WaitStoreRes);
+ je = jn;
+ continue;
+ }
+ if (jcr->client->NumConcurrentJobs < jcr->client->MaxConcurrentJobs) {
+ jcr->client->NumConcurrentJobs++;
+ } else {
+ jcr->store->NumConcurrentJobs--;
+ set_jcr_job_status(jcr, JS_WaitClientRes);
+ je = jn;
+ continue;
+ }
+ if (jcr->job->NumConcurrentJobs < jcr->job->MaxConcurrentJobs) {
+ jcr->job->NumConcurrentJobs++;
+ } else {
+ jcr->store->NumConcurrentJobs--;
+ jcr->client->NumConcurrentJobs--;
+ set_jcr_job_status(jcr, JS_WaitJobRes);
+ je = jn;
+ continue;
+ }
+ jcr->acquired_resource_locks = true;
+ jq->waiting_jobs->remove(je);
+ jq->ready_jobs->append(je);
+ Dmsg1(100, "moved JobId=%d from wait to ready queue\n", je->jcr->JobId);
+ je = jn;
+ } /* end for loop */
+ break;
+ } /* end while loop */
+ Dmsg0(100, "Done checking wait queue.\n");
+ /*
+ * If no more ready work and we are asked to quit, then do it
*/
- if (jq->list.empty() && jq->quit) {
+ if (jq->ready_jobs->empty() && jq->quit) {
jq->num_workers--;
if (jq->num_workers == 0) {
- Dmsg0(200, "Wake up destroy routine\n");
+ Dmsg0(100, "Wake up destroy routine\n");
/* Wake up destroy routine if he is waiting */
pthread_cond_broadcast(&jq->work);
}
- Dmsg0(200, "Unlock mutex\n");
- pthread_mutex_unlock(&jq->mutex);
- Dmsg0(200, "Return from jobq_server\n");
- return NULL;
+ break;
}
- Dmsg0(200, "Check for work request\n");
+ Dmsg0(100, "Check for work request\n");
/*
* If no more work requests, and we waited long enough, quit
*/
- Dmsg1(200, "jq empty = %d\n", jq->list.empty());
- Dmsg1(200, "timedout=%d\n", timedout);
- if (jq->list.empty() && timedout) {
- Dmsg0(200, "break big loop\n");
+ Dmsg2(100, "timedout=%d read empty=%d\n", timedout,
+ jq->ready_jobs->empty());
+ if (jq->ready_jobs->empty() && timedout) {
+ Dmsg0(100, "break big loop\n");
jq->num_workers--;
break;
}
- Dmsg0(200, "Loop again\n");
+ Dmsg0(100, "Loop again\n");
+ work = false;
} /* end of big for loop */
Dmsg0(200, "unlock mutex\n");
pthread_mutex_unlock(&jq->mutex);
- Dmsg0(200, "End jobq_server\n");
+ Dmsg0(100, "End jobq_server\n");
return NULL;
}
+
+#endif /* JOB_QUEUE */
projects / bacula / bacula / blobdiff