mirror of git://sourceware.org/git/glibc.git
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
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/* Machine-dependent pthreads configuration and inline functions.
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Sparc v9 version.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <rth@tamu.edu>.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Spinlock implementation; required. */
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extern inline int
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testandset (int *spinlock)
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{
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int ret;
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__asm__ __volatile__("ldstub %1,%0"
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: "=r"(ret), "=m"(*spinlock) : "m"(*spinlock));
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return ret;
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}
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#define CURRENT_STACK_FRAME stack_pointer
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register char * stack_pointer __asm__ ("%sp");
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/* Registers %g6 and %g7 are reserved by the ABI for "system use". It
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happens that Solaris uses %g6 for the thread pointer -- we do the same. */
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struct _pthread_descr_struct;
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register struct _pthread_descr_struct *__thread_self __asm__("%g6");
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/* Return the thread descriptor for the current thread. */
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#define THREAD_SELF __thread_self
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/* Initialize the thread-unique value. */
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#define INIT_THREAD_SELF(descr) (__thread_self = (descr))
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/* Compare-and-swap for semaphores. */
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#define HAS_COMPARE_AND_SWAP
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extern inline int
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__compare_and_swap (long int *p, long int oldval, long int newval)
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{
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long int readval;
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__asm__ __volatile__ ("cas %1, %2, %0"
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: "=r"(readval), "=m"(*p)
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: "r"(oldval), "m"(*p), "0"(newval));
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return readval == newval;
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}
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