libgomp/config/linux/alpha/futex.h

   1 /* Copyright (C) 2005 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU OpenMP Library (libgomp).
   5
   6    Libgomp is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU Lesser General Public License as published by
   8    the Free Software Foundation; either version 2.1 of the License, or
   9    (at your option) any later version.
  10
  11    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
  14    more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with libgomp; see the file COPYING.LIB.  If not, write to the
  18    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with other files, some
  22    of which are compiled with GCC, to produce an executable, this library
  23    does not by itself cause the resulting executable to be covered by the
  24    GNU General Public License.  This exception does not however invalidate
  25    any other reasons why the executable file might be covered by the GNU
  26    General Public License.  */
  27
  28 /* Provide target-specific access to the futex system call.  */
  29
  30 #ifndef SYS_futex
  31 #define SYS_futex               394
  32 #endif
  33 #define FUTEX_WAIT              0
  34 #define FUTEX_WAKE              1
  35
  36
  37 static inline void
  38 futex_wait (int *addr, int val)
  39 {
  40   register long sc_0 __asm__("$0");
  41   register long sc_16 __asm__("$16");
  42   register long sc_17 __asm__("$17");
  43   register long sc_18 __asm__("$18");
  44   register long sc_19 __asm__("$19");
  45
  46   sc_0 = SYS_futex;
  47   sc_16 = (long) addr;
  48   sc_17 = FUTEX_WAIT;
  49   sc_18 = val;
  50   sc_19 = 0;
  51   __asm volatile ("callsys"
  52                   : "=r" (sc_0), "=r"(sc_19)
  53                   : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19)
  54                   : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
  55                     "$22", "$23", "$24", "$25", "$27", "$28", "memory");
  56 }
  57
  58 static inline void
  59 futex_wake (int *addr, int count)
  60 {
  61   register long sc_0 __asm__("$0");
  62   register long sc_16 __asm__("$16");
  63   register long sc_17 __asm__("$17");
  64   register long sc_18 __asm__("$18");
  65   register long sc_19 __asm__("$19");
  66
  67   sc_0 = SYS_futex;
  68   sc_16 = (long) addr;
  69   sc_17 = FUTEX_WAKE;
  70   sc_18 = count;
  71   __asm volatile ("callsys"
  72                   : "=r" (sc_0), "=r"(sc_19)
  73                   : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18)
  74                   : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
  75                     "$22", "$23", "$24", "$25", "$27", "$28", "memory");
  76 }