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50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* Copyright (C) 2007-2023 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sched.h>
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#include <sysdep.h>
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#include <sysdep-vdso.h>
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static int
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vsyscall_sched_getcpu (void)
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{
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unsigned int cpu;
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int r = -1;
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#ifdef HAVE_GETCPU_VSYSCALL
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r = INLINE_VSYSCALL (getcpu, 3, &cpu, NULL, NULL);
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#else
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r = INLINE_SYSCALL_CALL (getcpu, &cpu, NULL, NULL);
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#endif
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return r == -1 ? r : cpu;
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}
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#ifdef RSEQ_SIG
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int
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sched_getcpu (void)
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{
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int cpu_id = THREAD_GETMEM_VOLATILE (THREAD_SELF, rseq_area.cpu_id);
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return __glibc_likely (cpu_id >= 0) ? cpu_id : vsyscall_sched_getcpu ();
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}
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#else /* RSEQ_SIG */
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int
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sched_getcpu (void)
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{
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return vsyscall_sched_getcpu ();
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}
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#endif /* RSEQ_SIG */
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