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88499a87ce
This patch consolidates the pause Linux implementation on sysdeps/unix/sysv/linux/pause.c. If defined the pause syscall (__NR_pause) will be used, other ppoll with 0 arguments will be used instead. It has the small advantage of generic pause implementation with uses rt_sigprocmask plus rt_sigsuspend because it requires only one syscall and the pause is done atomically regarding signal handling (for instance, pause may not be interrupted if the signal arrives between the rt_sigprocmask and rt_sigsuspend syscall). Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. * sysdeps/unix/sysv/linux/generic/pause.c: Remove file. * sysdeps/unix/sysv/linux/sparc/sparc64/pause.c: Likewise. * sysdeps/unix/sysv/linux/sparc/kernel-features.h [__arch64__] (__NR_pause): Undefine. * sysdeps/unix/sysv/linux/pause.c: New file. * sysdeps/unix/sysv/linux/syscalls.list: Remove pause from auto-generation list.
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* Set flags signalling availability of kernel features based on given
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kernel version number. SPARC version.
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Copyright (C) 1999-2017 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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/* SPARC uses socketcall. */
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#define __ASSUME_SOCKETCALL 1
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#include_next <kernel-features.h>
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/* 32-bit SPARC kernels do not support
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futex_atomic_cmpxchg_inatomic. */
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#if !defined __arch64__ && !defined __sparc_v9__
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# undef __ASSUME_SET_ROBUST_LIST
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#endif
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#if !defined __arch64__
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# undef __ASSUME_ACCEPT_SYSCALL
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# undef __ASSUME_CONNECT_SYSCALL
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# undef __ASSUME_RECVFROM_SYSCALL
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#else
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/* sparc64 defines __NR_pause, however it is not supported (ENOSYS).
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Undefine so pause.c can use a correct alternative. */
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# undef __NR_pause
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#endif
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/* sparc only supports ipc syscall. */
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#undef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
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