DPDK patches and discussions
 help / color / mirror / Atom feed
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().


  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220621224421.244a772f@sovereign \
    --to=dmitry.kozliuk@gmail.com \
    --cc=anatoly.burakov@intel.com \
    --cc=dev@dpdk.org \
    --cc=navasile@microsoft.com \
    --cc=roretzla@linux.microsoft.com \
    --cc=thomas@monjalon.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).