From patchwork Fri Nov 14 23:04:20 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roland McGrath X-Patchwork-Id: 3754 Received: (qmail 9411 invoked by alias); 14 Nov 2014 23:04:23 -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 9399 invoked by uid 89); 14 Nov 2014 23:04:23 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.2 required=5.0 tests=AWL, BAYES_00 autolearn=ham version=3.3.2 X-HELO: topped-with-meat.com MIME-Version: 1.0 From: Roland McGrath To: "GNU C. Library" Subject: [PATCH 3/3 roland/nptl] NPTL: Add stub createthread.c In-Reply-To: Roland McGrath's message of Friday, 14 November 2014 15:02:09 -0800 <20141114230209.CA2232C3B1E@topped-with-meat.com> References: <20141114230209.CA2232C3B1E@topped-with-meat.com> Message-Id: <20141114230420.2AF132C3B1C@topped-with-meat.com> Date: Fri, 14 Nov 2014 15:04:20 -0800 (PST) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.1 cv=SvUDtp+0 c=1 sm=1 tr=0 a=WkljmVdYkabdwxfqvArNOQ==:117 a=14OXPxybAAAA:8 a=kj9zAlcOel0A:10 a=hOe2yjtxAAAA:8 a=mDV3o1hIAAAA:8 a=HpUQMFtvMpQbs50WDnMA:9 a=CjuIK1q_8ugA:10 This adds a proper stub file for thread creation, documenting what sysdeps implementations should do. I'll commit this when I commit 1/3. Thanks, Roland * nptl/createthread.c: New file. --- /dev/null +++ b/nptl/createthread.c @@ -0,0 +1,47 @@ +/* Low-level thread creation for NPTL. Stub version. + Copyright (C) 2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +/* See the comments in pthread_create.c for the requirements for these + two macros and the create_thread function. */ + +#define START_THREAD_DEFN \ + static void __attribute__ ((noreturn)) start_thread (void) +#define START_THREAD_SELF THREAD_SELF + +static int +create_thread (struct pthread *pd, const struct pthread_attr *attr, + bool stopped_start, STACK_VARIABLES_PARMS, bool *thread_ran) +{ + /* If the implementation needs to do some tweaks to the thread after + it has been created at the OS level, it can set STOPPED_START here. */ + + pd->stopped_start = stopped_start; + if (__glibc_unlikely (stopped_start)) + /* We make sure the thread does not run far by forcing it to get a + lock. We lock it here too so that the new thread cannot continue + until we tell it to. */ + lll_lock (pd->lock, LLL_PRIVATE); + + return ENOSYS; + + /* It's started now, so if we fail below, we'll have to cancel it + and let it clean itself up. */ + *thread_ran = true; + + return 0; +}