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libzmq/src/atomic_ptr.hpp
Luca Boccassi cbd52feb48
Merge pull request #3112 from devindusoft/FixCompilation_ZMQ_ATOMIC_PTR_MUTEX 
Fixed compilation with ZMQ_ATOMIC_PTR_MUTEX
2018-05-15 15:10:49 +01:00

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/*
Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
This file is part of libzmq, the ZeroMQ core engine in C++.
libzmq is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
As a special exception, the Contributors give you permission to link
this library with independent modules to produce an executable,
regardless of the license terms of these independent modules, and to
copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the
terms and conditions of the license of that module. An independent
module is a module which is not derived from or based on this library.
If you modify this library, you must extend this exception to your
version of the library.
libzmq 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ZMQ_ATOMIC_PTR_HPP_INCLUDED__
#define __ZMQ_ATOMIC_PTR_HPP_INCLUDED__
#if defined ZMQ_FORCE_MUTEXES
#define ZMQ_ATOMIC_PTR_MUTEX
#elif defined ZMQ_HAVE_ATOMIC_INTRINSICS
#define ZMQ_ATOMIC_PTR_INTRINSIC
#elif (defined __cplusplus && __cplusplus >= 201103L) \
|| (defined _MSC_VER && _MSC_VER >= 1900)
#define ZMQ_ATOMIC_PTR_CXX11
#elif (defined __i386__ || defined __x86_64__) && defined __GNUC__
#define ZMQ_ATOMIC_PTR_X86
#elif defined __ARM_ARCH_7A__ && defined __GNUC__
#define ZMQ_ATOMIC_PTR_ARM
#elif defined __tile__
#define ZMQ_ATOMIC_PTR_TILE
#elif defined ZMQ_HAVE_WINDOWS
#define ZMQ_ATOMIC_PTR_WINDOWS
#elif (defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_NETBSD \
|| defined ZMQ_HAVE_GNU)
#define ZMQ_ATOMIC_PTR_ATOMIC_H
#else
#define ZMQ_ATOMIC_PTR_MUTEX
#endif
#if defined ZMQ_ATOMIC_PTR_MUTEX
#include "mutex.hpp"
#elif defined ZMQ_ATOMIC_PTR_CXX11
#include <atomic>
#elif defined ZMQ_ATOMIC_PTR_WINDOWS
#include "windows.hpp"
#elif defined ZMQ_ATOMIC_PTR_ATOMIC_H
#include <atomic.h>
#elif defined ZMQ_ATOMIC_PTR_TILE
#include <arch/atomic.h>
#endif
namespace zmq
{
#if !defined ZMQ_ATOMIC_PTR_CXX11
inline void *atomic_xchg_ptr (void **ptr,
void *const val_
#if defined ZMQ_ATOMIC_PTR_MUTEX
,
mutex_t &sync
#endif
)
{
#if defined ZMQ_ATOMIC_PTR_WINDOWS
return InterlockedExchangePointer ((PVOID *) ptr, val_);
#elif defined ZMQ_ATOMIC_PTR_INTRINSIC
return __atomic_exchange_n (ptr, val_, __ATOMIC_ACQ_REL);
#elif defined ZMQ_ATOMIC_PTR_ATOMIC_H
return atomic_swap_ptr (ptr, val_);
#elif defined ZMQ_ATOMIC_PTR_TILE
return arch_atomic_exchange (ptr, val_);
#elif defined ZMQ_ATOMIC_PTR_X86
void *old;
__asm__ volatile("lock; xchg %0, %2"
: "=r"(old), "=m"(*ptr)
: "m"(*ptr), "0"(val_));
return old;
#elif defined ZMQ_ATOMIC_PTR_ARM
void *old;
unsigned int flag;
__asm__ volatile(" dmb sy\n\t"
"1: ldrex %1, [%3]\n\t"
" strex %0, %4, [%3]\n\t"
" teq %0, #0\n\t"
" bne 1b\n\t"
" dmb sy\n\t"
: "=&r"(flag), "=&r"(old), "+Qo"(*ptr)
: "r"(ptr), "r"(val_)
: "cc");
return old;
#elif defined ZMQ_ATOMIC_PTR_MUTEX
sync.lock ();
void *old = *ptr;
*ptr = val_;
sync.unlock ();
return old;
#else
#error atomic_ptr is not implemented for this platform
#endif
}
inline void *atomic_cas (void *volatile *ptr_,
void *cmp_,
void *val_
#if defined ZMQ_ATOMIC_PTR_MUTEX
,
mutex_t &sync
#endif
)
{
#if defined ZMQ_ATOMIC_PTR_WINDOWS
return InterlockedCompareExchangePointer ((volatile PVOID *) ptr_, val_,
cmp_);
#elif defined ZMQ_ATOMIC_PTR_INTRINSIC
void *old = cmp_;
__atomic_compare_exchange_n (ptr_, &old, val_, false, __ATOMIC_RELEASE,
__ATOMIC_ACQUIRE);
return old;
#elif defined ZMQ_ATOMIC_PTR_ATOMIC_H
return atomic_cas_ptr (ptr_, cmp_, val_);
#elif defined ZMQ_ATOMIC_PTR_TILE
return arch_atomic_val_compare_and_exchange (ptr_, cmp_, val_);
#elif defined ZMQ_ATOMIC_PTR_X86
void *old;
__asm__ volatile("lock; cmpxchg %2, %3"
: "=a"(old), "=m"(*ptr_)
: "r"(val_), "m"(*ptr_), "0"(cmp_)
: "cc");
return old;
#elif defined ZMQ_ATOMIC_PTR_ARM
void *old;
unsigned int flag;
__asm__ volatile(" dmb sy\n\t"
"1: ldrex %1, [%3]\n\t"
" mov %0, #0\n\t"
" teq %1, %4\n\t"
" it eq\n\t"
" strexeq %0, %5, [%3]\n\t"
" teq %0, #0\n\t"
" bne 1b\n\t"
" dmb sy\n\t"
: "=&r"(flag), "=&r"(old), "+Qo"(*ptr_)
: "r"(ptr_), "r"(cmp_), "r"(val_)
: "cc");
return old;
#elif defined ZMQ_ATOMIC_PTR_MUTEX
sync.lock ();
void *old = *ptr_;
if (*ptr_ == cmp_)
*ptr_ = val_;
sync.unlock ();
return old;
#else
#error atomic_ptr is not implemented for this platform
#endif
}
#endif
// This class encapsulates several atomic operations on pointers.
template <typename T> class atomic_ptr_t
{
public:
// Initialise atomic pointer
inline atomic_ptr_t () { ptr = NULL; }
// Destroy atomic pointer
inline ~atomic_ptr_t () {}
// Set value of atomic pointer in a non-threadsafe way
// Use this function only when you are sure that at most one
// thread is accessing the pointer at the moment.
inline void set (T *ptr_) { this->ptr = ptr_; }
// Perform atomic 'exchange pointers' operation. Pointer is set
// to the 'val' value. Old value is returned.
inline T *xchg (T *val_)
{
#if defined ZMQ_ATOMIC_PTR_CXX11
return ptr.exchange (val_, std::memory_order_acq_rel);
#else
return (T *) atomic_xchg_ptr ((void **) &ptr, val_
#if defined ZMQ_ATOMIC_PTR_MUTEX
,
sync
#endif
);
#endif
}
// Perform atomic 'compare and swap' operation on the pointer.
// The pointer is compared to 'cmp' argument and if they are
// equal, its value is set to 'val'. Old value of the pointer
// is returned.
inline T *cas (T *cmp_, T *val_)
{
#if defined ZMQ_ATOMIC_PTR_CXX11
ptr.compare_exchange_strong (cmp_, val_, std::memory_order_acq_rel);
return cmp_;
#else
return (T *) atomic_cas ((void **) &ptr, cmp_, val_
#if defined ZMQ_ATOMIC_PTR_MUTEX
,
sync
#endif
);
#endif
}
private:
#if defined ZMQ_ATOMIC_PTR_CXX11
std::atomic<T *> ptr;
#else
volatile T *ptr;
#endif
#if defined ZMQ_ATOMIC_PTR_MUTEX
mutex_t sync;
#endif
#if !defined ZMQ_ATOMIC_PTR_CXX11
atomic_ptr_t (const atomic_ptr_t &);
const atomic_ptr_t &operator= (const atomic_ptr_t &);
#endif
};
struct atomic_value_t
{
atomic_value_t (const int value_) : value (value_) {}
atomic_value_t (const atomic_value_t &src) : value (src.load ()) {}
void store (const int value_)
{
#if defined ZMQ_ATOMIC_PTR_CXX11
value.store (value_, std::memory_order_release);
#else
atomic_xchg_ptr ((void **) &value, (void *) (ptrdiff_t) value_
#if defined ZMQ_ATOMIC_PTR_MUTEX
,
sync
#endif
);
#endif
}
int load () const
{
#if defined ZMQ_ATOMIC_PTR_CXX11
return value.load (std::memory_order_acquire);
#else
return (int) (ptrdiff_t) atomic_cas ((void **) &value, 0, 0
#if defined ZMQ_ATOMIC_PTR_MUTEX
,
#if defined __SUNPRO_CC
const_cast<mutex_t &> (sync)
#else
sync
#endif
#endif
);
#endif
}
private:
#if defined ZMQ_ATOMIC_PTR_CXX11
std::atomic<int> value;
#else
volatile ptrdiff_t value;
#endif
#if defined ZMQ_ATOMIC_PTR_MUTEX
mutable mutex_t sync;
#endif
private:
atomic_value_t &operator= (const atomic_value_t &src);
};
}
// Remove macros local to this file.
#undef ZMQ_ATOMIC_PTR_MUTEX
#undef ZMQ_ATOMIC_PTR_INTRINSIC
#undef ZMQ_ATOMIC_PTR_CXX11
#undef ZMQ_ATOMIC_PTR_X86
#undef ZMQ_ATOMIC_PTR_ARM
#undef ZMQ_ATOMIC_PTR_TILE
#undef ZMQ_ATOMIC_PTR_WINDOWS
#undef ZMQ_ATOMIC_PTR_ATOMIC_H
#endif
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