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[PATCH 3/3 roland/nptl] NPTL: Add stub createthread.c
- From: Roland McGrath <roland at hack dot frob dot com>
- To: "GNU C. Library" <libc-alpha at sourceware dot org>
- Date: Fri, 14 Nov 2014 15:04:20 -0800 (PST)
- Subject: [PATCH 3/3 roland/nptl] NPTL: Add stub createthread.c
- Authentication-results: sourceware.org; auth=none
- References: <20141114230209 dot CA2232C3B1E at topped-with-meat dot com>
This adds a proper stub file for thread creation, documenting what sysdeps
implementations should do. I'll commit this when I commit 1/3.
* nptl/createthread.c: New file.
@@ -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
+ <http://www.gnu.org/licenses/>. */
+/* 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
+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;