From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
To: Tyler Retzlaff <roretzla@linux.microsoft.com>
Cc: dev@dpdk.org, thomas@monjalon.net, anatoly.burakov@intel.com,
Narcisa Vasile <navasile@microsoft.com>
Subject: Re: [PATCH v2 2/6] eal: add thread lifetime management
Date: Tue, 21 Jun 2022 22:44:21 +0300 [thread overview]
Message-ID: <20220621224421.244a772f@sovereign> (raw)
In-Reply-To: <20220621185103.GC18214@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
2022-06-21 11:51 (UTC-0700), Tyler Retzlaff:
> > > +int
> > > +rte_thread_join(rte_thread_t thread_id, unsigned long *value_ptr)
> > > +{
> > > + int ret = 0;
> > > + void *res = NULL;
> > > + void **pres = NULL;
> > > +
> > > + if (value_ptr != NULL)
> > > + pres = &res;
> > > +
> > > + ret = pthread_join((pthread_t)thread_id.opaque_id, pres);
> > > + if (ret != 0) {
> > > + RTE_LOG(DEBUG, EAL, "pthread_join failed\n");
> > > + return ret;
> > > + }
> > > +
> > > + if (value_ptr != NULL && *pres != NULL)
> > > + *value_ptr = *(unsigned long *)(*pres);
> > > +
> > > + return 0;
> > > +}
> >
> > What makes *pres == NULL special?
>
> it's not clear what you mean, can you explain? maybe there is some
> context i am missing from the original patch series?
There's no previous context.
After ptread_join(), *pres holds the return value of the thread routine.
You only assign *value_ptr if value_ptr is not NULL (obviously correct)
and if *pres != NULL, that is, if the thread returned a non-NULL value.
But this value is opaque, why do you filter NULL?
Perhaps you meant if (pres != NULL), no dereference?
> > > +int
> > > +rte_thread_create(rte_thread_t *thread_id,
> > > + const rte_thread_attr_t *thread_attr,
> > > + rte_thread_func thread_func, void *args)
> > > +{
> > > + int ret = 0;
> > > + DWORD tid;
> > > + HANDLE thread_handle = NULL;
> > > + GROUP_AFFINITY thread_affinity;
> > > + struct thread_routine_ctx *ctx = NULL;
> > > +
> > > + ctx = calloc(1, sizeof(*ctx));
> > > + if (ctx == NULL) {
> > > + RTE_LOG(DEBUG, EAL, "Insufficient memory for thread context allocations\n");
> > > + ret = ENOMEM;
> > > + goto cleanup;
> > > + }
> > > + ctx->routine_args = args;
> > > + ctx->thread_func = thread_func;
> > > +
> > > + thread_handle = CreateThread(NULL, 0, thread_func_wrapper, ctx,
> > > + CREATE_SUSPENDED, &tid);
> > > + if (thread_handle == NULL) {
> > > + ret = thread_log_last_error("CreateThread()");
> > > + free(ctx);
> > > + goto cleanup;
> >
> > Missing `free(ctx)` from other error paths below.
>
> beyond this point free(ctx) will happen in thread_func_wrapper. i will
> add a comment to make it clear.
Not if you exit before ResumeThread()
and thread_func_wrapper() will never execute to call free().
next prev parent reply other threads:[~2022-06-21 19:44 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-09 13:58 [PATCH 0/6] add thread lifetime and attributes API Tyler Retzlaff
2022-06-09 13:58 ` [PATCH 1/6] eal: add thread attributes Tyler Retzlaff
2022-06-09 13:58 ` [PATCH 2/6] eal: add thread lifetime management Tyler Retzlaff
2022-06-09 13:58 ` [PATCH 3/6] eal: add basic rte thread ID equal API Tyler Retzlaff
2022-06-09 22:24 ` Konstantin Ananyev
2022-06-10 22:48 ` Tyler Retzlaff
2022-06-11 12:25 ` Konstantin Ananyev
2022-06-13 13:39 ` Tyler Retzlaff
2022-06-10 0:40 ` fengchengwen
2022-06-09 13:58 ` [PATCH 4/6] test/threads: add tests for thread lifetime API Tyler Retzlaff
2022-06-09 13:58 ` [PATCH 5/6] test/threads: add tests for thread attributes API Tyler Retzlaff
2022-06-09 13:58 ` [PATCH 6/6] test/threads: remove unit test use of pthread Tyler Retzlaff
2022-06-14 23:47 ` [PATCH v2 0/6] add thread lifetime and attributes API Tyler Retzlaff
2022-06-14 23:47 ` [PATCH v2 1/6] eal: add thread attributes Tyler Retzlaff
2022-06-14 23:47 ` [PATCH v2 2/6] eal: add thread lifetime management Tyler Retzlaff
2022-06-18 12:59 ` Dmitry Kozlyuk
2022-06-20 17:39 ` Tyler Retzlaff
2022-06-21 16:24 ` Tyler Retzlaff
2022-06-21 18:51 ` Tyler Retzlaff
2022-06-21 19:44 ` Dmitry Kozlyuk [this message]
2022-06-21 21:28 ` Tyler Retzlaff
2022-06-21 22:24 ` Dmitry Kozlyuk
2022-06-22 18:21 ` Tyler Retzlaff
2022-06-14 23:47 ` [PATCH v2 3/6] eal: add basic rte thread ID equal API Tyler Retzlaff
2022-06-20 8:34 ` Konstantin Ananyev
2022-06-14 23:47 ` [PATCH v2 4/6] test/threads: add tests for thread lifetime API Tyler Retzlaff
2022-06-14 23:47 ` [PATCH v2 5/6] test/threads: add tests for thread attributes API Tyler Retzlaff
2022-06-14 23:47 ` [PATCH v2 6/6] test/threads: remove unit test use of pthread Tyler Retzlaff
2022-06-22 20:26 ` [PATCH v3 0/6] add thread lifetime and attributes API Tyler Retzlaff
2022-06-22 20:26 ` [PATCH v3 1/6] eal: add thread attributes Tyler Retzlaff
2022-06-22 20:26 ` [PATCH v3 2/6] eal: add thread lifetime management Tyler Retzlaff
2022-06-22 20:26 ` [PATCH v3 3/6] eal: add basic rte thread ID equal API Tyler Retzlaff
2022-06-22 20:26 ` [PATCH v3 4/6] test/threads: add tests for thread lifetime API Tyler Retzlaff
2022-06-22 20:26 ` [PATCH v3 5/6] test/threads: add tests for thread attributes API Tyler Retzlaff
2022-06-22 20:26 ` [PATCH v3 6/6] test/threads: remove unit test use of pthread Tyler Retzlaff
2022-06-27 16:56 ` [PATCH v4 0/6] add thread lifetime and attributes API Tyler Retzlaff
2022-06-27 16:56 ` [PATCH v4 1/6] eal: add thread attributes Tyler Retzlaff
2022-06-27 16:56 ` [PATCH v4 2/6] eal: add thread lifetime management Tyler Retzlaff
2022-06-27 16:56 ` [PATCH v4 3/6] eal: add basic rte thread ID equal API Tyler Retzlaff
2022-06-27 16:56 ` [PATCH v4 4/6] test/threads: add tests for thread lifetime API Tyler Retzlaff
2022-06-27 16:56 ` [PATCH v4 5/6] test/threads: add tests for thread attributes API Tyler Retzlaff
2022-06-27 16:56 ` [PATCH v4 6/6] test/threads: remove unit test use of pthread Tyler Retzlaff
2022-07-31 21:16 ` [PATCH v4 0/6] add thread lifetime and attributes API Dmitry Kozlyuk
2022-09-21 8:15 ` David Marchand
2022-09-29 7:02 ` David Marchand
2022-10-05 16:11 ` Tyler Retzlaff
2022-10-05 16:34 ` Tyler Retzlaff
2022-10-06 6:52 ` David Marchand
2022-10-06 15:14 ` Tyler Retzlaff
2022-10-06 13:36 ` Thomas Monjalon
2022-10-06 15:10 ` Tyler Retzlaff
2022-10-06 15:14 ` Thomas Monjalon
2022-10-06 15:20 ` Tyler Retzlaff
2022-10-06 15:26 ` David Marchand
2022-10-06 15:27 ` Tyler Retzlaff
2022-10-05 17:07 ` [PATCH v5 " Tyler Retzlaff
2022-10-05 17:07 ` [PATCH v5 1/6] eal: add thread attributes Tyler Retzlaff
2022-10-06 8:32 ` David Marchand
2022-10-05 17:07 ` [PATCH v5 2/6] eal: add thread lifetime management Tyler Retzlaff
2023-03-01 8:11 ` David Marchand
2023-03-01 20:34 ` Tyler Retzlaff
2022-10-05 17:07 ` [PATCH v5 3/6] eal: add basic rte thread ID equal API Tyler Retzlaff
2022-10-05 17:07 ` [PATCH v5 4/6] test/threads: add tests for thread lifetime API Tyler Retzlaff
2022-10-06 8:32 ` David Marchand
2022-10-06 15:19 ` Tyler Retzlaff
2022-10-05 17:07 ` [PATCH v5 5/6] test/threads: add tests for thread attributes API Tyler Retzlaff
2022-10-05 17:07 ` [PATCH v5 6/6] test/threads: remove unit test use of pthread Tyler Retzlaff
2022-10-06 19:25 ` [PATCH v5 0/6] add thread lifetime and attributes API David Marchand
2022-10-07 19:20 ` Tyler Retzlaff
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