/usr/include/flext/lockfree/cas.hpp is in pd-flext-dev 0.6.0+git20161101.1.01318a94-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Copyright (C) 2007-2008 Tim Blechmann & Thomas Grill
//
// This program 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 2 of the License, or
// (at your option) any later version.
//
// This program 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 this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
// $Revision$
// $LastChangedRevision$
// $LastChangedDate$
// $LastChangedBy$
#ifndef __LOCKFREE_CAS_H
#define __LOCKFREE_CAS_H
#include "prefix.hpp"
#ifndef _WIN32
// pthreads are not available under Windows by default and we should not need them there
# include <pthread.h>
#endif
namespace lockfree
{
inline void memory_barrier()
{
#if defined(__GNUC__) && ( (__GNUC__ > 4) || ((__GNUC__ >= 4) && (__GNUC_MINOR__ >= 1)) )
__sync_synchronize();
#elif defined(__GNUC__) && (defined(__i386__) || defined(__i686__))
asm("" : : : "memory");
#elif defined(_MSC_VER) && (_MSC_VER >= 1300)
_ReadWriteBarrier();
#elif defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4)
OSMemoryBarrier();
#elif defined(AO_HAVE_nop_full)
AO_nop_full();
#else
# error no memory barrier implemented for this platform
#endif
}
template <class C, class D>
inline bool CAS(volatile C * addr,D old,D nw)
{
#if defined(__GNUC__) && ( (__GNUC__ > 4) || ((__GNUC__ >= 4) && (__GNUC_MINOR__ >= 1)) )
return __sync_bool_compare_and_swap(addr, old, nw);
#elif defined(_MSC_VER)
assert((size_t(addr)&3) == 0); // a runtime check only for debug mode is somehow insufficient....
return _InterlockedCompareExchange(addr,nw,old) == old;
#elif defined(_WIN32) || defined(_WIN64)
assert((size_t(addr)&3) == 0); // a runtime check only for debug mode is somehow insufficient....
return InterlockedCompareExchange(addr,nw,old) == old;
#elif defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4)
if(sizeof(D) == 4)
return OSAtomicCompareAndSwap32(old,nw,addr);
else if(sizeof(D) == 8)
return OSAtomicCompareAndSwap64(old,nw,addr);
else
assert(false);
#elif defined(AO_HAVE_compare_and_swap_full)
return AO_compare_and_swap_full(reinterpret_cast<volatile AO_t*>(addr),
reinterpret_cast<AO_t>(old),
reinterpret_cast<AO_t>(nw));
#else
# ifdef __GNUC__
# warning blocking CAS emulation
# else
# pragma message("blocking CAS emulation")
# endif
pthread_mutex_t guard = PTHREAD_MUTEX_INITIALIZER;
int status = pthread_mutex_lock(&guard);
assert(!status);
bool ret;
if (*addr == old)
{
*addr = nw;
ret = true;
}
else
ret = false;
int status2 = pthread_mutex_unlock(&guard);
assert(!status2);
return ret;
#endif
}
template <class C, class D, class E>
inline bool CAS2(C * addr,D old1,E old2,D new1,E new2)
{
#if defined(__GNUC__) && ((__GNUC__ > 4) || ( (__GNUC__ >= 4) && (__GNUC_MINOR__ >= 2) ) ) && (defined(__i686__) || defined(__pentiumpro__) || defined(__nocona__) || defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8))
struct packed_c
{
D d;
E e;
};
union cu
{
packed_c c;
long long l;
};
cu old;
old.c.d = old1;
old.c.e = old2;
cu nw;
nw.c.d = new1;
nw.c.e = new2;
return __sync_bool_compare_and_swap_8(reinterpret_cast<volatile long long*>(addr),
old.l,
nw.l);
#elif defined(__GNUC__) && ((__GNUC__ > 4) || ( (__GNUC__ >= 4) && (__GNUC_MINOR__ >= 2) ) ) && (defined(__x86_64__) || defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16))
struct packed_c
{
D d;
E e;
};
union cu
{
packed_c c;
long long l;
};
cu old;
old.c.d = old1;
old.c.e = old2;
cu nw;
nw.c.d = new1;
nw.c.e = new2;
return __sync_bool_compare_and_swap_16(reinterpret_cast<volatile long long*>(addr),
old.l,
nw.l);
#elif defined(_MSC_VER)
bool ok;
__asm {
# ifdef _WIN32
mov eax,[old1]
mov edx,[old2]
mov ebx,[new1]
mov ecx,[new2]
mov edi,[addr]
lock cmpxchg8b [edi]
# else
mov rax,[old1]
mov rdx,[old2]
mov rbx,[new1]
mov rcx,[new2]
mov rdi,[addr]
lock cmpxchg16b [rdi]
# endif
setz [ok]
}
return ok;
#elif defined(__GNUC__) && (defined(__i386__) || defined(__i686__) || defined(__x86_64__))
char result;
if(sizeof(D) == 4 && sizeof(E) == 4) {
#ifndef __PIC__
__asm__ __volatile__("lock; cmpxchg8b %0; setz %1"
: "=m"(*addr), "=q"(result)
: "m"(*addr), "a" (old1), "d" (old2),
"b" (new1), "c" (new2) : "memory");
#else
__asm__ __volatile__("push %%ebx; movl %5,%%ebx; lock; cmpxchg8b %0; setz %1; pop %%ebx"
: "=m"(*addr), "=q"(result)
: "m"(*addr), "a" (old1), "d" (old2),
"m" (new1), "c" (new2) : "memory");
#endif
}
else if(sizeof(D) == 8 && sizeof(E) == 8) {
__asm__ __volatile__("lock; cmpxchg16b %0; setz %1"
: "=m"(*addr), "=q"(result)
: "m"(*addr), "a" (old1), "d" (old2),
"b" (new1), "c" (new2) : "memory");
}
else
assert(false);
return result != 0;
#elif defined(AO_HAVE_double_compare_and_swap_full)
if (sizeof(D) != sizeof(AO_t) || sizeof(E) != sizeof(AO_t)) {
assert(false);
return false;
}
return AO_compare_double_and_swap_double_full(
reinterpret_cast<volatile AO_double_t*>(addr),
static_cast<AO_t>(old2),
reinterpret_cast<AO_t>(old1),
static_cast<AO_t>(new2),
reinterpret_cast<AO_t>(new1)
);
#else
# ifdef __GNUC__
# warning blocking CAS2 emulation
# else
# pragma message("blocking CAS2 emulation")
# endif
struct packed_c
{
D d;
E e;
};
volatile packed_c * packed_addr = reinterpret_cast<volatile packed_c*>(addr);
pthread_mutex_t guard = PTHREAD_MUTEX_INITIALIZER;
int status = pthread_mutex_lock(&guard);
assert(!status);
bool ret;
if (packed_addr->d == old1 &&
packed_addr->e == old2)
{
packed_addr->d = new1;
packed_addr->e = new2;
ret = true;
}
else
ret = false;
int status2 = pthread_mutex_unlock(&guard);
assert(!status2);
return ret;
#endif
}
} // namespace
#endif /* __LOCKFREE_CAS_H */
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