diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/lowlevelsem.h')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/lowlevelsem.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/lowlevelsem.h b/nptl/sysdeps/unix/sysv/linux/i386/lowlevelsem.h new file mode 100644 index 0000000000..bd5f96402b --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/i386/lowlevelsem.h @@ -0,0 +1,101 @@ +/* Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _LOWLEVELSEM_H +#define _LOWLEVELSEM_H 1 + +#ifndef LOCK +# ifdef UP +# define LOCK /* nothing */ +# else +# define LOCK "lock;" +# endif +#endif + +#define SYS_futex 240 + + +#define lll_sem_wait(sem) \ + ({ int result, ignore1, ignore2; \ + __asm __volatile ("1:\tincl 8(%4)\n\t" \ + LOCK "incl (%4)\n\t" \ + "jng 2f\n" \ + ".subsection 1\n" \ + "2:\tmovl %4, %%eax\n\t" \ + "call __lll_unlock_wake\n\t" \ + "jmp 3f\n\t" \ + ".previous\n" \ + "3:\tpushl %%ebx\n\t" \ + "movl %%esi, %%ecx\n\t" \ + "movl %%esi, %%edx\n\t" \ + "leal 4(%4), %%ebx\n\t" \ + "movl %5, %%eax\n\t" \ + "int $0x80\n\t" \ + "movl %%eax, %%edx\n\t" \ + "popl %%ebx\n\t" \ + "orl $-1, %%eax\n\t" \ + LOCK "xaddl %%eax, (%4)\n\t" \ + "jne 4f\n\t" \ + ".subsection 1\n" \ + "4:\tmovl %4, %%ecx\n\t" \ + "call __lll_lock_wait\n\t" \ + "jmp 5f\n\t" \ + ".previous\n" \ + "5:\tdecl 8(%4)\n\t" \ + "xorl %0, %0\n\t" \ + "cmpl $0, 4(%4)\n\t" \ + "jne,pt 6f\n\t" \ + "cmpl %7, %%edx\n\t" \ + "jne,pn 1b\n\t" \ + "addl %8, %0\n\t" /* Shorter than movl %7, %0 */ \ + "6:" \ + : "=a" (result), "=c" (ignore1), "=d" (ignore2), \ + "=m" (*sem) \ + : "D" (sem), "i" (SYS_futex), "S" (0), \ + "i" (-EINTR), "i" (EINTR)); \ + result; }) + + +extern int __lll_sem_timedwait (struct sem *sem, const struct timespec *ts) + __attribute__ ((regparm (2))) attribute_hidden; +#define lll_sem_timedwait(sem, timeout) \ + __lll_sem_timedwait (sem, timeout) + + +#define lll_sem_post(sem) \ + (void) ({ int ignore1, ignore2, ignore3; \ + __asm __volatile ("movl $1, %%eax\n\t" \ + LOCK \ + "xaddl %%eax, (%4)\n\t" \ + "pushl %%esi\n\t" \ + "pushl %%ebx\n\t" \ + "movl %4, %%ebx\n\t" \ + "leal 1(%%eax), %%edx\n\t" \ + "xorl %%esi, %%esi\n\t" \ + "movl %5, %%eax\n\t" \ + /* movl $FUTEX_WAKE, %ecx */ \ + "movl $1, %%ecx\n\t" \ + "int $0x80\n\t" \ + "popl %%ebx\n\t" \ + "popl %%esi" \ + : "=&a" (ignore1), "=c" (ignore2), \ + "=m" (*sem), "=d" (ignore3) \ + : "r" (sem), "i" (SYS_futex)); }) + +#endif /* lowlevelsem.h */ |