From patchwork Tue Jan 14 18:52:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Thibault X-Patchwork-Id: 37372 Received: (qmail 91834 invoked by alias); 14 Jan 2020 18:53:17 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 91807 invoked by uid 89); 14 Jan 2020 18:53:16 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-26.1 required=5.0 tests=BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_NONE, SPF_HELO_PASS, SPF_NEUTRAL autolearn=ham version=3.3.1 spammy=HContent-Transfer-Encoding:8bit X-HELO: hera.aquilenet.fr From: Samuel Thibault To: libc-alpha@sourceware.org Cc: Samuel Thibault Subject: [PATCH 03/10] htl: Add support for C11 threads behavior Date: Tue, 14 Jan 2020 19:52:48 +0100 Message-Id: <20200114185255.25813-5-samuel.thibault@ens-lyon.org> In-Reply-To: <20200114185255.25813-1-samuel.thibault@ens-lyon.org> References: <20200114185255.25813-1-samuel.thibault@ens-lyon.org> MIME-Version: 1.0 Essentially properly calling the thread function which returns an int instead of a void*. Reviewed-by: Adhemerval Zanella --- htl/pt-create.c | 20 +++++++++++++++++++- htl/pt-internal.h | 3 +++ sysdeps/htl/pthreadP.h | 3 +++ 3 files changed, 25 insertions(+), 1 deletion(-) diff --git a/htl/pt-create.c b/htl/pt-create.c index 0b3237f46a..090d394f53 100644 --- a/htl/pt-create.c +++ b/htl/pt-create.c @@ -59,7 +59,17 @@ entry_point (struct __pthread *self, void *(*start_routine) (void *), void *arg) __pthread_startup (); - __pthread_exit (start_routine (arg)); + if (self->c11) + { + /* The function pointer of the c11 thread start is cast to an incorrect + type on __pthread_create call, however it is casted back to correct + one so the call behavior is well-defined (it is assumed that pointers + to void are able to represent all values of int). */ + int (*start)(void*) = (int (*) (void*)) start_routine; + __pthread_exit ((void*) (uintptr_t) start (arg)); + } + else + __pthread_exit (start_routine (arg)); } /* Create a thread with attributes given by ATTR, executing @@ -99,6 +109,14 @@ __pthread_create_internal (struct __pthread **thread, if (err) goto failed; + if (attr == ATTR_C11_THREAD) + { + attr = NULL; + pthread->c11 = true; + } + else + pthread->c11 = false; + /* Use the default attributes if ATTR is NULL. */ setup = attr ? attr : &__pthread_default_attr; diff --git a/htl/pt-internal.h b/htl/pt-internal.h index f8d7d74244..8a45854070 100644 --- a/htl/pt-internal.h +++ b/htl/pt-internal.h @@ -100,6 +100,9 @@ struct __pthread /* Resolver state. */ struct __res_state res_state; + /* Indicates whether is a C11 thread created by thrd_creat. */ + bool c11; + /* Thread context. */ struct pthread_mcontext mcontext; diff --git a/sysdeps/htl/pthreadP.h b/sysdeps/htl/pthreadP.h index b1c7575f89..fc8c9bc591 100644 --- a/sysdeps/htl/pthreadP.h +++ b/sysdeps/htl/pthreadP.h @@ -21,6 +21,9 @@ #include +/* Attribute to indicate thread creation was issued from C11 thrd_create. */ +#define ATTR_C11_THREAD ((void*)(uintptr_t)-1) + /* These represent the interface used by glibc itself. */ extern pthread_t __pthread_self (void);