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include/boost/detail/atomic_count.hpp  view on Meta::CPAN

//    Returns: nothing
//
//  --a;
//
//    Effects: Atomically decrements the value of a
//    Returns: (long) zero if the new value of a is zero,
//      unspecified non-zero value otherwise (usually the new value)
//
//    Important note: when --a returns zero, it must act as a
//      read memory barrier (RMB); i.e. the calling thread must
//      have a synchronized view of the memory
//
//    On Intel IA-32 (x86) memory is always synchronized, so this
//      is not a problem.
//
//    On many architectures the atomic instructions already act as
//      a memory barrier.
//
//    This property is necessary for proper reference counting, since
//      a thread can update the contents of a shared object, then
//      release its reference, and another thread may immediately
//      release the last reference causing object destruction.
//
//    The destructor needs to have a synchronized view of the
//      object to perform proper cleanup.
//
//    Original example by Alexander Terekhov:
//
//    Given:
//
//    - a mutable shared object OBJ;
//    - two threads THREAD1 and THREAD2 each holding 
//      a private smart_ptr object pointing to that OBJ.
//
//    t1: THREAD1 updates OBJ (thread-safe via some synchronization)
//      and a few cycles later (after "unlock") destroys smart_ptr;
//
//    t2: THREAD2 destroys smart_ptr WITHOUT doing any synchronization 
//      with respect to shared mutable object OBJ; OBJ destructors
//      are called driven by smart_ptr interface...
//

#include <boost/config.hpp>

#ifndef BOOST_HAS_THREADS

namespace boost
{

include/boost/pool/detail/mutex.hpp  view on Meta::CPAN

// 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.

#ifndef BOOST_POOL_MUTEX_HPP
#define BOOST_POOL_MUTEX_HPP

#include <boost/config.hpp>  // for workarounds

// Extremely Light-Weight wrapper classes for OS thread synchronization

// Configuration: for now, we just choose between pthread or Win32 mutexes or none

#define BOOST_MUTEX_HELPER_NONE         0
#define BOOST_MUTEX_HELPER_WIN32        1
#define BOOST_MUTEX_HELPER_PTHREAD      2

#if !defined(BOOST_HAS_THREADS) && !defined(BOOST_NO_MT)
# define BOOST_NO_MT
#endif

include/boost/thread/read_write_mutex.hpp  view on Meta::CPAN

// David Moore, William E. Kempf, Michael Glassford
//
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appear in all copies and
// that both that copyright notice and this permission notice appear
// in supporting documentation.  David Moore makes no representations
// about the suitability of this software for any purpose.
// It is provided "as is" without express or implied warranty.

// A Boost::threads implementation of a synchronization
//   primitive which can allow multiple readers or a single
//   writer to have access to a shared resource.

#ifndef BOOST_READ_WRITE_MUTEX_JDM030602_HPP
#define BOOST_READ_WRITE_MUTEX_JDM030602_HPP

#include <boost/thread/detail/config.hpp>

#include <boost/utility.hpp>
#include <boost/detail/workaround.hpp>

include/boost/wave/util/cpp_iterator.hpp  view on Meta::CPAN

        return true;
    }

// found a pp directive, so try to identify it, start with the pp_token
bool found_eof = false;
boost::spirit::tree_parse_info<lexer_type> hit = 
    cpp_grammar_type::parse_cpp_grammar(it, iter_ctx->last, found_eof, act_pos);

    if (hit.match) {
    // position the iterator past the matched sequence to allow 
    // resynchronisation, if an error occurs
        iter_ctx->first = hit.stop;
        
    // found a valid pp directive, dispatch to the correct function to handle 
    // the found pp directive
    bool result = dispatch_directive (hit);
    
        if (found_eof) {
        // The line was terminated with an end of file token.
        // So trigger a warning, that the last line was not terminated with a 
        // newline.