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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <bool.h>
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#include <bool.h>
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#include <futex.h>
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#include <futex.h>
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#include <libadt/list.h>
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#include <libadt/list.h>
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#include <sys/types.h>
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#include "vfs.h"
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#include "vfs.h"
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/** Per-connection futex protecting the files array. */
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__thread atomic_t files_futex = FUTEX_INITIALIZER;
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/**
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/**
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 * This is a per-connection table of open files.
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 * This is a per-connection table of open files.
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 * Our assumption is that each client opens only one connection and therefore
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 * Our assumption is that each client opens only one connection and therefore
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 * there is one table of open files per task. However, this may not be the case
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 * there is one table of open files per task. However, this may not be the case
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 * and the client can open more connections to VFS. In that case, there will be
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 * and the client can open more connections to VFS. In that case, there will be
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 * several tables and several file handle name spaces per task. Besides of this,
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 * several tables and several file handle name spaces per task. Besides of this,
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 * the functionality will stay unchanged. So unless the client knows what it is
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 * the functionality will stay unchanged. So unless the client knows what it is
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 * doing, it should open one connection to VFS only.
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 * doing, it should open one connection to VFS only.
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 *
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 * Allocation of the open files table is deferred until the client makes the
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 * first VFS_OPEN operation.
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 */
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 */
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__thread vfs_file_t files[MAX_OPEN_FILES];
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__thread vfs_file_t *files = NULL;
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/** Initialize the table of open files. */
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/** Initialize the table of open files. */
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bool vfs_conn_open_files_init(void)
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static bool vfs_conn_open_files_init(void)
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{
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{
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    futex_down(&files_futex);
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    if (!files) {
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        files = malloc(MAX_OPEN_FILES * sizeof(vfs_file_t));
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        if (!files) {
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            futex_up(&files_futex);
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            return false;
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        }
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    memset(files, 0, MAX_OPEN_FILES * sizeof(vfs_file_t));
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        memset(files, 0, MAX_OPEN_FILES * sizeof(vfs_file_t));
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    }
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    futex_up(&files_futex);
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    return true;
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    return true;
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}
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}
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void vfs_open(ipc_callid_t rid, ipc_call_t *request)
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void vfs_open(ipc_callid_t rid, ipc_call_t *request)
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{
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{
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    if (!vfs_conn_open_files_init()) {
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        ipc_answer_fast_0(rid, ENOMEM);
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        return;
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    }
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}
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}
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/**
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/**
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 * @}
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 * @}
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 */
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 */