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// Copyright (C) 2000 Stephen Cleary
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org for updates, documentation, and revision history.
//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2007-2013. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_MUTEX_HPP
#define BOOST_CONTAINER_MUTEX_HPP
#ifndef BOOST_CONFIG_HPP
# include <boost/config.hpp>
#endif
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
//#define BOOST_CONTAINER_NO_MT
//#define BOOST_CONTAINER_NO_SPINLOCKS
#include <boost/container/detail/config_begin.hpp>
#include <boost/container/detail/workaround.hpp>
// Extremely Light-Weight wrapper classes for OS thread synchronization
#define BOOST_MUTEX_HELPER_NONE 0
#define BOOST_MUTEX_HELPER_WIN32 1
#define BOOST_MUTEX_HELPER_PTHREAD 2
#define BOOST_MUTEX_HELPER_SPINLOCKS 3
#if !defined(BOOST_HAS_THREADS) && !defined(BOOST_NO_MT)
# define BOOST_NO_MT
#endif
#if defined(BOOST_NO_MT) || defined(BOOST_CONTAINER_NO_MT)
// No multithreading -> make locks into no-ops
#define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_NONE
#else
//Taken from dlmalloc
#if !defined(BOOST_CONTAINER_NO_SPINLOCKS) && \
((defined(__GNUC__) && \
((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) || \
defined(__i386__) || defined(__x86_64__))) || \
(defined(_MSC_VER) && _MSC_VER>=1310))
#define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_SPINLOCKS
#endif
#if defined(BOOST_WINDOWS)
#include <windows.h>
#ifndef BOOST_MUTEX_HELPER
#define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_WIN32
#endif
#elif defined(BOOST_HAS_UNISTD_H)
#include <unistd.h>
#if !defined(BOOST_MUTEX_HELPER) && (defined(_POSIX_THREADS) || defined(BOOST_HAS_PTHREADS))
#define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_PTHREAD
#endif
#endif
#endif
#ifndef BOOST_MUTEX_HELPER
#error Unable to determine platform mutex type; #define BOOST_NO_MT to assume single-threaded
#endif
#if BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_NONE
//...
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_SPINLOCKS
#if defined(_MSC_VER)
#ifndef _M_AMD64
/* These are already defined on AMD64 builds */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
long __cdecl _InterlockedCompareExchange(long volatile *Dest, long Exchange, long Comp);
long __cdecl _InterlockedExchange(long volatile *Target, long Value);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _M_AMD64 */
#pragma intrinsic (_InterlockedCompareExchange)
#pragma intrinsic (_InterlockedExchange)
#define interlockedcompareexchange _InterlockedCompareExchange
#define interlockedexchange _InterlockedExchange
#elif defined(WIN32) && defined(__GNUC__)
#define interlockedcompareexchange(a, b, c) __sync_val_compare_and_swap(a, c, b)
#define interlockedexchange __sync_lock_test_and_set
#endif /* Win32 */
/* First, define CAS_LOCK and CLEAR_LOCK on ints */
/* Note CAS_LOCK defined to return 0 on success */
#if defined(__GNUC__)&& (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
#define BOOST_CONTAINER_CAS_LOCK(sl) __sync_lock_test_and_set(sl, 1)
#define BOOST_CONTAINER_CLEAR_LOCK(sl) __sync_lock_release(sl)
#elif (defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)))
/* Custom spin locks for older gcc on x86 */
static inline int boost_container_x86_cas_lock(int *sl) {
int ret;
int val = 1;
int cmp = 0;
__asm__ __volatile__ ("lock; cmpxchgl %1, %2"
: "=a" (ret)
: "r" (val), "m" (*(sl)), "0"(cmp)
: "memory", "cc");
return ret;
}
static inline void boost_container_x86_clear_lock(int* sl) {
assert(*sl != 0);
int prev = 0;
int ret;
__asm__ __volatile__ ("lock; xchgl %0, %1"
: "=r" (ret)
: "m" (*(sl)), "0"(prev)
: "memory");
}
#define BOOST_CONTAINER_CAS_LOCK(sl) boost_container_x86_cas_lock(sl)
#define BOOST_CONTAINER_CLEAR_LOCK(sl) boost_container_x86_clear_lock(sl)
#else /* Win32 MSC */
#define BOOST_CONTAINER_CAS_LOCK(sl) interlockedexchange((long volatile*)sl, (long)1)
#define BOOST_CONTAINER_CLEAR_LOCK(sl) interlockedexchange((long volatile*)sl, (long)0)
#endif
/* How to yield for a spin lock */
#define SPINS_PER_YIELD 63
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
#define SLEEP_EX_DURATION 50 /* delay for yield/sleep */
#define SPIN_LOCK_YIELD SleepEx(SLEEP_EX_DURATION, FALSE)
#elif defined (__SVR4) && defined (__sun) /* solaris */
#include <thread.h>
#define SPIN_LOCK_YIELD thr_yield();
#elif !defined(LACKS_SCHED_H)
#include <sched.h>
#define SPIN_LOCK_YIELD sched_yield();
#else
#define SPIN_LOCK_YIELD
#endif /* ... yield ... */
#define BOOST_CONTAINER_SPINS_PER_YIELD 63
inline int boost_interprocess_spin_acquire_lock(int *sl) {
int spins = 0;
while (*(volatile int *)sl != 0 ||
BOOST_CONTAINER_CAS_LOCK(sl)) {
if ((++spins & BOOST_CONTAINER_SPINS_PER_YIELD) == 0) {
SPIN_LOCK_YIELD;
}
}
return 0;
}
#define BOOST_CONTAINER_MLOCK_T int
#define BOOST_CONTAINER_TRY_LOCK(sl) !BOOST_CONTAINER_CAS_LOCK(sl)
#define BOOST_CONTAINER_RELEASE_LOCK(sl) BOOST_CONTAINER_CLEAR_LOCK(sl)
#define BOOST_CONTAINER_ACQUIRE_LOCK(sl) (BOOST_CONTAINER_CAS_LOCK(sl)? boost_interprocess_spin_acquire_lock(sl) : 0)
#define BOOST_MOVE_INITIAL_LOCK(sl) (*sl = 0)
#define BOOST_CONTAINER_DESTROY_LOCK(sl) (0)
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_WIN32
//
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_PTHREAD
#include <pthread.h>
#endif
namespace boost {
namespace container {
namespace container_detail {
#if BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_NONE
class null_mutex
{
private:
null_mutex(const null_mutex &);
void operator=(const null_mutex &);
public:
null_mutex() { }
static void lock() { }
static void unlock() { }
};
typedef null_mutex default_mutex;
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_SPINLOCKS
class spin_mutex
{
private:
BOOST_CONTAINER_MLOCK_T sl;
spin_mutex(const spin_mutex &);
void operator=(const spin_mutex &);
public:
spin_mutex() { BOOST_MOVE_INITIAL_LOCK(&sl); }
void lock() { BOOST_CONTAINER_ACQUIRE_LOCK(&sl); }
void unlock() { BOOST_CONTAINER_RELEASE_LOCK(&sl); }
};
typedef spin_mutex default_mutex;
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_WIN32
class mutex
{
private:
CRITICAL_SECTION mtx;
mutex(const mutex &);
void operator=(const mutex &);
public:
mutex()
{ InitializeCriticalSection(&mtx); }
~mutex()
{ DeleteCriticalSection(&mtx); }
void lock()
{ EnterCriticalSection(&mtx); }
void unlock()
{ LeaveCriticalSection(&mtx); }
};
typedef mutex default_mutex;
#elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_PTHREAD
class mutex
{
private:
pthread_mutex_t mtx;
mutex(const mutex &);
void operator=(const mutex &);
public:
mutex()
{ pthread_mutex_init(&mtx, 0); }
~mutex()
{ pthread_mutex_destroy(&mtx); }
void lock()
{ pthread_mutex_lock(&mtx); }
void unlock()
{ pthread_mutex_unlock(&mtx); }
};
typedef mutex default_mutex;
#endif
template<class Mutex>
class scoped_lock
{
public:
scoped_lock(Mutex &m)
: m_(m)
{ m_.lock(); }
~scoped_lock()
{ m_.unlock(); }
private:
Mutex &m_;
};
} // namespace container_detail
} // namespace container
} // namespace boost
#undef BOOST_MUTEX_HELPER_WIN32
#undef BOOST_MUTEX_HELPER_PTHREAD
#undef BOOST_MUTEX_HELPER_NONE
#undef BOOST_MUTEX_HELPER
#undef BOOST_MUTEX_HELPER_SPINLOCKS
#include <boost/container/detail/config_end.hpp>
#endif
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