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85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/*
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Copyright 2005-2014 Intel Corporation. All Rights Reserved.
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This file is part of Threading Building Blocks. Threading Building Blocks is free software;
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you can redistribute it and/or modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation. Threading Building Blocks is
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distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details. You should have received a copy of
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the GNU General Public License along with Threading Building Blocks; if not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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As a special exception, you may use this file as part of a free software library without
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restriction. Specifically, if other files instantiate templates or use macros or inline
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functions from this file, or you compile this file and link it with other files to produce
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an executable, this file does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however invalidate any other
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reasons why the executable file might be covered by the GNU General Public License.
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*/
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#ifndef __TBB_machine_H
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#error Do not #include this internal file directly; use public TBB headers instead.
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#endif
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#include <sched.h>
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#define __TBB_Yield() sched_yield()
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#include <unistd.h>
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/* Futex definitions */
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#include <sys/syscall.h>
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#if defined(SYS_futex)
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#define __TBB_USE_FUTEX 1
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#include <limits.h>
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#include <errno.h>
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// Unfortunately, some versions of Linux do not have a header that defines FUTEX_WAIT and FUTEX_WAKE.
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#ifdef FUTEX_WAIT
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#define __TBB_FUTEX_WAIT FUTEX_WAIT
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#else
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#define __TBB_FUTEX_WAIT 0
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#endif
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#ifdef FUTEX_WAKE
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#define __TBB_FUTEX_WAKE FUTEX_WAKE
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#else
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#define __TBB_FUTEX_WAKE 1
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#endif
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#ifndef __TBB_ASSERT
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#error machine specific headers must be included after tbb_stddef.h
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#endif
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namespace tbb {
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namespace internal {
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inline int futex_wait( void *futex, int comparand ) {
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int r = syscall( SYS_futex,futex,__TBB_FUTEX_WAIT,comparand,NULL,NULL,0 );
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#if TBB_USE_ASSERT
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int e = errno;
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__TBB_ASSERT( r==0||r==EWOULDBLOCK||(r==-1&&(e==EAGAIN||e==EINTR)), "futex_wait failed." );
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#endif /* TBB_USE_ASSERT */
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return r;
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}
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inline int futex_wakeup_one( void *futex ) {
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int r = ::syscall( SYS_futex,futex,__TBB_FUTEX_WAKE,1,NULL,NULL,0 );
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__TBB_ASSERT( r==0||r==1, "futex_wakeup_one: more than one thread woken up?" );
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return r;
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}
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inline int futex_wakeup_all( void *futex ) {
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int r = ::syscall( SYS_futex,futex,__TBB_FUTEX_WAKE,INT_MAX,NULL,NULL,0 );
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__TBB_ASSERT( r>=0, "futex_wakeup_all: error in waking up threads" );
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return r;
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}
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} /* namespace internal */
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} /* namespace tbb */
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#endif /* SYS_futex */
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