FM / io

/usr/include/stxxl/bits/io

Name	Size	Mode	Actions
boostfd_file.h	2121	0644	edit dl rm
completion_handler.h	2834	0644	edit dl rm
create_file.h	1331	0644	edit dl rm
disk_queued_file.h	1746	0644	edit dl rm
disk_queues.h	3962	0644	edit dl rm
file.h	7676	0644	edit dl rm
fileperblock_file.h	2538	0644	edit dl rm
io.h	1271	0644	edit dl rm
iostats.h	16238	0644	edit dl rm
linuxaio_file.h	2574	0644	edit dl rm
linuxaio_queue.h	3109	0644	edit dl rm
linuxaio_request.h	2099	0644	edit dl rm
mem_file.h	1744	0644	edit dl rm
mmap_file.h	1870	0644	edit dl rm
request.h	3145	0644	edit dl rm
request_interface.h	2682	0644	edit dl rm
request_operations.h	5188	0644	edit dl rm
request_queue.h	1245	0644	edit dl rm
request_queue_impl_1q.h	2103	0644	edit dl rm
request_queue_impl_qwqr.h	2274	0644	edit dl rm
request_queue_impl_worker.h	2029	0644	edit dl rm
request_with_state.h	1699	0644	edit dl rm
request_with_waiters.h	1576	0644	edit dl rm
serving_request.h	1387	0644	edit dl rm
simdisk_file.h	4283	0644	edit dl rm
syscall_file.h	1844	0644	edit dl rm
ufs_file_base.h	1865	0644	edit dl rm
wbtl_file.h	3415	0644	edit dl rm
wfs_file_base.h	1663	0644	edit dl rm
wincall_file.h	2045	0644	edit dl rm

Edit: /usr/include/stxxl/bits/io/linuxaio_queue.h (3109B)

#ifndef STXXL_IO_LINUXAIO_QUEUE_HEADER
#define STXXL_IO_LINUXAIO_QUEUE_HEADER

#include <stxxl/bits/io/linuxaio_file.h>

#if STXXL_HAVE_LINUXAIO_FILE

#include <linux/aio_abi.h>
#include <list>

#include <stxxl/bits/io/request_queue_impl_worker.h>
#include <stxxl/bits/common/mutex.h>

STXXL_BEGIN_NAMESPACE

//! \addtogroup reqlayer
//! \{

//! Queue for linuxaio_file(s)
//!
//! Only one queue exists in a program, i.e. it is a singleton.
class linuxaio_queue : public request_queue_impl_worker
{
    friend class linuxaio_request;

typedef linuxaio_queue self_type;

private:
    //! OS context
    aio_context_t context;

//! storing linuxaio_request* would drop ownership
    typedef std::list<request_ptr> queue_type;

// "waiting" request have submitted to this queue, but not yet to the OS,
    // those are "posted"
    mutex waiting_mtx, posted_mtx;
    queue_type waiting_requests, posted_requests;

//! max number of OS requests
    int max_events;
    //! number of requests in waitings_requests
    semaphore num_waiting_requests, num_free_events, num_posted_requests;

// two threads, one for posting, one for waiting
    thread_type post_thread, wait_thread;
    state<thread_state> post_thread_state, wait_thread_state;

// Why do we need two threads, one for posting, and one for waiting?  Is
    // one not enough?
    // 1. User call cannot io_submit directly, since this tends to take
    //    considerable time sometimes
    // 2. A single thread cannot wait for the user program to post requests
    //    and the OS to produce I/O completion events at the same time
    //    (IOCB_CMD_NOOP does not seem to help here either)

static const priority_op _priority_op = WRITE;

static void * post_async(void* arg);   // thread start callback
    static void * wait_async(void* arg);   // thread start callback
    void post_requests();
    void handle_events(io_event* events, long num_events, bool canceled);
    void wait_requests();
    void suspend();

// needed by linuxaio_request
    aio_context_t get_io_context() { return context; }

public:
    //! Construct queue. Requests max number of requests simultaneously
    //! submitted to disk, 0 means as many as possible
    linuxaio_queue(int desired_queue_length = 0);

void add_request(request_ptr& req);
    bool cancel_request(request_ptr& req);
    void complete_request(request_ptr& req);
    ~linuxaio_queue();
};

//! \}

STXXL_END_NAMESPACE

#endif // #if STXXL_HAVE_LINUXAIO_FILE

#endif // !STXXL_IO_LINUXAIO_QUEUE_HEADER
// vim: et:ts=4:sw=4

/*************************************************************************** * include/stxxl/bits/io/linuxaio_queue.h * * Part of the STXXL. See http://stxxl.sourceforge.net * * Copyright (C) 2011 Johannes Singler * Copyright (C) 2014 Timo Bingmann * * 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) **************************************************************************/ #ifndef STXXL_IO_LINUXAIO_QUEUE_HEADER #define STXXL_IO_LINUXAIO_QUEUE_HEADER #include #if STXXL_HAVE_LINUXAIO_FILE #include #include #include #include STXXL_BEGIN_NAMESPACE //! \addtogroup reqlayer //! \{ //! Queue for linuxaio_file(s) //! //! Only one queue exists in a program, i.e. it is a singleton. class linuxaio_queue : public request_queue_impl_worker { friend class linuxaio_request; typedef linuxaio_queue self_type; private: //! OS context aio_context_t context; //! storing linuxaio_request* would drop ownership typedef std::list queue_type; // "waiting" request have submitted to this queue, but not yet to the OS, // those are "posted" mutex waiting_mtx, posted_mtx; queue_type waiting_requests, posted_requests; //! max number of OS requests int max_events; //! number of requests in waitings_requests semaphore num_waiting_requests, num_free_events, num_posted_requests; // two threads, one for posting, one for waiting thread_type post_thread, wait_thread; state post_thread_state, wait_thread_state; // Why do we need two threads, one for posting, and one for waiting? Is // one not enough? // 1. User call cannot io_submit directly, since this tends to take // considerable time sometimes // 2. A single thread cannot wait for the user program to post requests // and the OS to produce I/O completion events at the same time // (IOCB_CMD_NOOP does not seem to help here either) static const priority_op _priority_op = WRITE; static void * post_async(void* arg); // thread start callback static void * wait_async(void* arg); // thread start callback void post_requests(); void handle_events(io_event* events, long num_events, bool canceled); void wait_requests(); void suspend(); // needed by linuxaio_request aio_context_t get_io_context() { return context; } public: //! Construct queue. Requests max number of requests simultaneously //! submitted to disk, 0 means as many as possible linuxaio_queue(int desired_queue_length = 0); void add_request(request_ptr& req); bool cancel_request(request_ptr& req); void complete_request(request_ptr& req); ~linuxaio_queue(); }; //! \} STXXL_END_NAMESPACE #endif // #if STXXL_HAVE_LINUXAIO_FILE #endif // !STXXL_IO_LINUXAIO_QUEUE_HEADER // vim: et:ts=4:sw=4