gcc/libgomp/config/linux/x86/futex.h
Thomas Schwinge f1f3453e11 libgomp: Now known as the GNU Offloading and Multi Processing Runtime Library.
libgomp/
	* configure.ac: Rename libgomp from "GNU OpenMP Runtime Library"
	to "GNU Offloading and Multi Processing Runtime Library".  Change
	all users.
	* configure: Regenerate.
	* libgomp.texi: Update.
	gcc/
	* doc/install.texi: Update for libgomp being renamed from "GNU
	OpenMP Runtime Library" to "GNU Offloading and Multi Processing
	Runtime Library".
	* doc/sourcebuild.texi: Likewise.
	gcc/fortran/
	* gfortran.texi: Update for libgomp being renamed from "GNU OpenMP
	Runtime Library" to "GNU Offloading and Multi Processing Runtime
	Library".
	* intrinsic.texi: Likewise.
	libstdc++-v3/
	* doc/xml/manual/parallel_mode.xml: Update for libgomp being
	renamed from "GNU OpenMP Runtime Library" to "GNU Offloading and
	Multi Processing Runtime Library".

Co-Authored-By: David Malcolm <dmalcolm@redhat.com>
Co-Authored-By: Julian Brown <julian@codesourcery.com>

From-SVN: r219425
2015-01-10 20:10:37 +01:00

149 lines
3.6 KiB
C

/* Copyright (C) 2005-2015 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgomp 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 General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Provide target-specific access to the futex system call. */
#ifdef __x86_64__
# ifndef SYS_futex
# define SYS_futex 202
# endif
static inline void
futex_wait (int *addr, int val)
{
register long r10 __asm__("%r10");
long res;
r10 = 0;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
"d" (val), "r" (r10)
: "r11", "rcx", "memory");
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
r10 = 0;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
"d" (val), "r" (r10)
: "r11", "rcx", "memory");
}
}
static inline void
futex_wake (int *addr, int count)
{
long res;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
"d" (count)
: "r11", "rcx", "memory");
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
"d" (count)
: "r11", "rcx", "memory");
}
}
#else
# ifndef SYS_futex
# define SYS_futex 240
# endif
# ifdef __PIC__
static inline long
sys_futex0 (int *addr, int op, int val)
{
long res;
__asm volatile ("xchgl\t%%ebx, %2\n\t"
"int\t$0x80\n\t"
"xchgl\t%%ebx, %2"
: "=a" (res)
: "0"(SYS_futex), "r" (addr), "c"(op),
"d"(val), "S"(0)
: "memory");
return res;
}
# else
static inline long
sys_futex0 (int *addr, int op, int val)
{
long res;
__asm volatile ("int $0x80"
: "=a" (res)
: "0"(SYS_futex), "b" (addr), "c"(op),
"d"(val), "S"(0)
: "memory");
return res;
}
# endif /* __PIC__ */
static inline void
futex_wait (int *addr, int val)
{
long res = sys_futex0 (addr, gomp_futex_wait, val);
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
sys_futex0 (addr, gomp_futex_wait, val);
}
}
static inline void
futex_wake (int *addr, int count)
{
long res = sys_futex0 (addr, gomp_futex_wake, count);
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
sys_futex0 (addr, gomp_futex_wake, count);
}
}
#endif /* __x86_64__ */
static inline void
cpu_relax (void)
{
__builtin_ia32_pause ();
}