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nptl: Add C11 threads call_once functions
This patch adds the call_* definitions from C11 threads (ISO/IEC 9899:2011), more specifically call_once and required types. Mostly of the definitions are composed based on POSIX conterparts,including once_flag (pthread_once_t). The idea is to make possible to share POSIX internal implementations for mostly of the code (and making adjustment only when required). Checked with a build for all major ABI (aarch64-linux-gnu, alpha-linux-gnu, arm-linux-gnueabi, i386-linux-gnu, ia64-linux-gnu, m68k-linux-gnu, microblaze-linux-gnu [1], mips{64}-linux-gnu, nios2-linux-gnu, powerpc{64le}-linux-gnu, s390{x}-linux-gnu, sparc{64}-linux-gnu, and x86_64-linux-gnu). Also ran a full check on aarch64-linux-gnu, x86_64-linux-gnu, i686-linux-gnu, arm-linux-gnueabhf, and powerpc64le-linux-gnu. [BZ #14092] * conform/data/threads.h-data (ONCE_FLAG_INIT): New macro. (once_flag): New type. (call_once): New function. * nptl/Makefile (libpthread-routines): Add call_once object. * nptl/Versions (libphread) [GLIBC_2.28]: Add call_once symbol. * nptl/call_once.c: New file. * sysdeps/nptl/threads.h (ONCE_FLAG_INIT): New define. (once_flag): New type. (call_once): New prototype.
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ChangeLog
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ChangeLog
@ -1,5 +1,16 @@
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2018-07-24 Adhemerval Zanella <adhemerval.zanella@linaro.org>
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[BZ #14092]
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* conform/data/threads.h-data (ONCE_FLAG_INIT): New macro.
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(once_flag): New type.
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(call_once): New function.
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* nptl/Makefile (libpthread-routines): Add call_once object.
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* nptl/Versions (libphread) [GLIBC_2.28]: Add call_once symbol.
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* nptl/call_once.c: New file.
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* sysdeps/nptl/threads.h (ONCE_FLAG_INIT): New define.
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(once_flag): New type.
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(call_once): New prototype.
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[BZ #14092]
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* conform/data/threads.h-data (mtx_plain): New constant.
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(mtx_recursive): Likewise.
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@ -1,5 +1,7 @@
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#if defined ISO11
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macro ONCE_FLAG_INIT
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constant thrd_success
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constant thrd_busy
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constant thrd_error
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@ -13,6 +15,7 @@ constant mtx_timed
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type thrd_t
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type thrd_start_t
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type mtx_t
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type once_flag
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function int thrd_create (thrd_t*, thrd_start_t, void*)
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function int thrd_equal (thrd_t, thrd_t)
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@ -30,6 +33,8 @@ function int mtx_trylock (mtx_t*)
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function int mtx_unlock (mtx_t*)
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function void mtx_destroy (mtx_t*)
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function void call_once (once_flag*, void (*)(void))
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#include "time.h-data"
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#endif
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@ -143,7 +143,7 @@ libpthread-routines = nptl-init nptlfreeres vars events version pt-interp \
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pthread_setattr_default_np pthread_getattr_default_np \
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thrd_create thrd_detach thrd_exit thrd_join \
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mtx_destroy mtx_init mtx_lock mtx_timedlock \
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mtx_trylock mtx_unlock
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mtx_trylock mtx_unlock call_once
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# pthread_setuid pthread_seteuid pthread_setreuid \
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# pthread_setresuid \
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# pthread_setgid pthread_setegid pthread_setregid \
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@ -273,6 +273,7 @@ libpthread {
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GLIBC_2.28 {
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thrd_create; thrd_detach; thrd_exit; thrd_join;
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mtx_init; mtx_lock; mtx_timedlock; mtx_trylock; mtx_unlock; mtx_destroy;
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call_once;
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}
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GLIBC_PRIVATE {
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31
nptl/call_once.c
Normal file
31
nptl/call_once.c
Normal file
@ -0,0 +1,31 @@
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/* C11 threads call once implementation.
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Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdalign.h>
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#include "thrd_priv.h"
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void
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call_once (once_flag *flag, void (*func)(void))
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{
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_Static_assert (sizeof (once_flag) == sizeof (pthread_once_t),
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"sizeof (once_flag) != sizeof (pthread_once_t)");
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_Static_assert (alignof (once_flag) == alignof (pthread_once_t),
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"alignof (once_flag) != alignof (pthread_once_t)");
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__pthread_once (&flag->__data, func);
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}
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@ -48,6 +48,12 @@ enum
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mtx_timed = 2
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};
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typedef struct
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{
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int __data __ONCE_ALIGNMENT;
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} once_flag;
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#define ONCE_FLAG_INIT { 0 }
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typedef union
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{
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char __size[__SIZEOF_PTHREAD_MUTEX_T];
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@ -129,6 +135,11 @@ extern int mtx_unlock (mtx_t *__mutex);
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/* Destroy the mutex object pointed by __MUTEX. */
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extern void mtx_destroy (mtx_t *__mutex);
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/* Call function __FUNC exactly once, even if invoked from several threads.
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All calls must be made with the same __FLAGS object. */
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extern void call_once (once_flag *__flag, void (*__func)(void));
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__END_DECLS
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#endif /* _THREADS_H */
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