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956953884e
Each thread can use a thread local variable to keep the name of a job which is currently running in the job. The virThreadJobSetWorker API is supposed to be called once by any thread which is used as a worker, i.e., it is waiting in a pool, woken up to do a job, and returned back to the pool. The virThreadJobSet/virThreadJobClear APIs are to be called at the beginning/end of each job. Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
/*
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* virthreadjob.c: code for tracking job associated with current thread
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*
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* Copyright (C) 2013-2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Author: Jiri Denemark <jdenemar@redhat.com>
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*/
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#include <config.h>
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#include "internal.h"
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#include "virerror.h"
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#include "virlog.h"
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#include "virthread.h"
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#include "virthreadjob.h"
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#define VIR_FROM_THIS VIR_FROM_THREAD
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VIR_LOG_INIT("util.threadjob");
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virThreadLocal virThreadJobWorker;
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virThreadLocal virThreadJobName;
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static int
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virThreadJobOnceInit(void)
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{
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if (virThreadLocalInit(&virThreadJobWorker, NULL) < 0 ||
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virThreadLocalInit(&virThreadJobName, NULL) < 0)
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return -1;
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return 0;
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}
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VIR_ONCE_GLOBAL_INIT(virThreadJob)
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const char *
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virThreadJobGet(void)
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{
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const char *job;
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if (virThreadJobInitialize() < 0)
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return NULL;
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job = virThreadLocalGet(&virThreadJobName);
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if (!job)
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job = virThreadLocalGet(&virThreadJobWorker);
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return job;
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}
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void
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virThreadJobSetWorker(const char *worker)
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{
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if (!worker || virThreadJobInitialize() < 0)
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return;
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if (virThreadLocalSet(&virThreadJobWorker, (void *) worker) < 0)
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virReportSystemError(errno,
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_("cannot set worker name to %s"),
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worker);
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VIR_DEBUG("Thread %llu is running worker %s", virThreadSelfID(), worker);
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}
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void
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virThreadJobSet(const char *caller)
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{
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const char *worker;
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if (!caller || virThreadJobInitialize() < 0)
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return;
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if (virThreadLocalSet(&virThreadJobName, (void *) caller) < 0)
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virReportSystemError(errno,
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_("cannot set current job to %s"),
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caller);
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if ((worker = virThreadLocalGet(&virThreadJobWorker))) {
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VIR_DEBUG("Thread %llu (%s) is now running job %s",
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virThreadSelfID(), worker, caller);
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} else {
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VIR_DEBUG("Thread %llu is now running job %s",
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virThreadSelfID(), caller);
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}
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}
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void
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virThreadJobClear(int rv)
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{
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const char *old;
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const char *worker;
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if (virThreadJobInitialize() < 0)
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return;
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if (!(old = virThreadLocalGet(&virThreadJobName)))
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return;
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if (virThreadLocalSet(&virThreadJobName, NULL) < 0)
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virReportSystemError(errno, "%s", _("cannot reset current job"));
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if ((worker = virThreadLocalGet(&virThreadJobWorker))) {
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VIR_DEBUG("Thread %llu (%s) finished job %s with ret=%d",
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virThreadSelfID(), worker, old, rv);
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} else {
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VIR_DEBUG("Thread %llu finished job %s with ret=%d",
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virThreadSelfID(), old, rv);
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}
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}
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