From: David Marchand <david.marchand@redhat.com>
To: Tyler Retzlaff <roretzla@linux.microsoft.com>
Cc: dev@dpdk.org, thomas@monjalon.net, dmitry.kozliuk@gmail.com,
anatoly.burakov@intel.com
Subject: Re: [PATCH v5 2/6] eal: add thread lifetime management
Date: Wed, 1 Mar 2023 09:11:43 +0100 [thread overview]
Message-ID: <CAJFAV8wmEbrx3-oy98QPdGUYFmgdgdE2Ot=nfXjVg4ahL3oAXA@mail.gmail.com> (raw)
In-Reply-To: <1664989651-29303-3-git-send-email-roretzla@linux.microsoft.com>
Hello Tyler,
On Wed, Oct 5, 2022 at 7:07 PM Tyler Retzlaff
<roretzla@linux.microsoft.com> wrote:
> diff --git a/lib/eal/unix/rte_thread.c b/lib/eal/unix/rte_thread.c
> index 9126595..d4c1a7f 100644
> --- a/lib/eal/unix/rte_thread.c
> +++ b/lib/eal/unix/rte_thread.c
> @@ -16,6 +16,11 @@ struct eal_tls_key {
> pthread_key_t thread_index;
> };
>
> +struct thread_routine_ctx {
> + rte_thread_func thread_func;
> + void *routine_args;
> +};
> +
> static int
> thread_map_priority_to_os_value(enum rte_thread_priority eal_pri, int *os_pri,
> int *pol)
> @@ -75,6 +80,136 @@ struct eal_tls_key {
> return 0;
> }
>
> +static void *
> +thread_func_wrapper(void *arg)
> +{
> + struct thread_routine_ctx ctx = *(struct thread_routine_ctx *)arg;
> +
> + free(arg);
> +
> + return (void *)(uintptr_t)ctx.thread_func(ctx.routine_args);
> +}
> +
> +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;
> + pthread_attr_t attr;
> + pthread_attr_t *attrp = NULL;
> + struct thread_routine_ctx *ctx;
> + struct sched_param param = {
> + .sched_priority = 0,
> + };
> + int policy = SCHED_OTHER;
> +
> + 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;
> +
> + if (thread_attr != NULL) {
> + ret = pthread_attr_init(&attr);
> + if (ret != 0) {
> + RTE_LOG(DEBUG, EAL, "pthread_attr_init failed\n");
> + goto cleanup;
> + }
> +
> + attrp = &attr;
> +
> + /*
> + * Set the inherit scheduler parameter to explicit,
> + * otherwise the priority attribute is ignored.
> + */
> + ret = pthread_attr_setinheritsched(attrp,
> + PTHREAD_EXPLICIT_SCHED);
> + if (ret != 0) {
> + RTE_LOG(DEBUG, EAL, "pthread_attr_setinheritsched failed\n");
> + goto cleanup;
> + }
> +
> +
> + if (thread_attr->priority ==
> + RTE_THREAD_PRIORITY_REALTIME_CRITICAL) {
> + ret = ENOTSUP;
> + goto cleanup;
> + }
> + ret = thread_map_priority_to_os_value(thread_attr->priority,
> + ¶m.sched_priority, &policy);
> + if (ret != 0)
> + goto cleanup;
> +
> + ret = pthread_attr_setschedpolicy(attrp, policy);
> + if (ret != 0) {
> + RTE_LOG(DEBUG, EAL, "pthread_attr_setschedpolicy failed\n");
> + goto cleanup;
> + }
> +
> + ret = pthread_attr_setschedparam(attrp, ¶m);
> + if (ret != 0) {
> + RTE_LOG(DEBUG, EAL, "pthread_attr_setschedparam failed\n");
> + goto cleanup;
> + }
> + }
> +
> + ret = pthread_create((pthread_t *)&thread_id->opaque_id, attrp,
> + thread_func_wrapper, ctx);
> + if (ret != 0) {
> + RTE_LOG(DEBUG, EAL, "pthread_create failed\n");
> + goto cleanup;
> + }
> +
> + if (thread_attr != NULL && CPU_COUNT(&thread_attr->cpuset) > 0) {
> + ret = rte_thread_set_affinity_by_id(*thread_id,
> + &thread_attr->cpuset);
> + if (ret != 0) {
> + RTE_LOG(DEBUG, EAL, "rte_thread_set_affinity_by_id failed\n");
> + goto cleanup;
> + }
> + }
> +
> + ctx = NULL;
> +cleanup:
> + free(ctx);
> + if (attrp != NULL)
> + pthread_attr_destroy(&attr);
> +
> + return ret;
> +}
I am looking back at potential races in our code while reviewing the
ctrl thread creation fix, and I stopped at this patch.
What happens if rte_thread_set_affinity_by_id() fails?
A new thread got started, but I don't see it being terminated in the
cleanup phase.
In this same situation, we may have a small race for a double free on
ctx since thread_func_wrapper() may have already been called from the
new thread.
I have the same concerns with the windows implementation.
--
David Marchand
next prev parent reply other threads:[~2023-03-01 8:11 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
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 [this message]
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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