/usr/include/tbb/machine/linux_common.h is in libtbb-dev 4.3~20150611-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | /*
Copyright 2005-2015 Intel Corporation. All Rights Reserved.
This file is part of Threading Building Blocks. Threading Building Blocks is free software;
you can redistribute it and/or modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation. Threading Building Blocks 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. You should have received a copy of
the GNU General Public License along with Threading Building Blocks; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, you may use this file as part of a free software library without
restriction. Specifically, if other files instantiate templates or use macros or inline
functions from this file, or you compile this file and link it with other files to produce
an executable, this file does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however invalidate any other
reasons why the executable file might be covered by the GNU General Public License.
*/
#ifndef __TBB_machine_H
#error Do not #include this internal file directly; use public TBB headers instead.
#endif
#include <sched.h>
#define __TBB_Yield() sched_yield()
#include <unistd.h>
/* Futex definitions */
#include <sys/syscall.h>
#if defined(SYS_futex)
#define __TBB_USE_FUTEX 1
#include <limits.h>
#include <errno.h>
// Unfortunately, some versions of Linux do not have a header that defines FUTEX_WAIT and FUTEX_WAKE.
#ifdef FUTEX_WAIT
#define __TBB_FUTEX_WAIT FUTEX_WAIT
#else
#define __TBB_FUTEX_WAIT 0
#endif
#ifdef FUTEX_WAKE
#define __TBB_FUTEX_WAKE FUTEX_WAKE
#else
#define __TBB_FUTEX_WAKE 1
#endif
#ifndef __TBB_ASSERT
#error machine specific headers must be included after tbb_stddef.h
#endif
namespace tbb {
namespace internal {
inline int futex_wait( void *futex, int comparand ) {
int r = syscall( SYS_futex,futex,__TBB_FUTEX_WAIT,comparand,NULL,NULL,0 );
#if TBB_USE_ASSERT
int e = errno;
__TBB_ASSERT( r==0||r==EWOULDBLOCK||(r==-1&&(e==EAGAIN||e==EINTR)), "futex_wait failed." );
#endif /* TBB_USE_ASSERT */
return r;
}
inline int futex_wakeup_one( void *futex ) {
int r = ::syscall( SYS_futex,futex,__TBB_FUTEX_WAKE,1,NULL,NULL,0 );
__TBB_ASSERT( r==0||r==1, "futex_wakeup_one: more than one thread woken up?" );
return r;
}
inline int futex_wakeup_all( void *futex ) {
int r = ::syscall( SYS_futex,futex,__TBB_FUTEX_WAKE,INT_MAX,NULL,NULL,0 );
__TBB_ASSERT( r>=0, "futex_wakeup_all: error in waking up threads" );
return r;
}
} /* namespace internal */
} /* namespace tbb */
#endif /* SYS_futex */
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