forked from 0ad/0ad
janwas
d802b73d94
wdbg: cleanup, improve exception catcher (previously potentially failed if __try block came in non-main thread). required since wstartup no longer commandeers the entry point. winit, wstartup: update documentation This was SVN commit r5141.
899 lines
20 KiB
C++
899 lines
20 KiB
C++
/**
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* =========================================================================
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* File : waio.cpp
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* Project : 0 A.D.
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* Description : emulate POSIX asynchronous I/O on Windows.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "waio.h"
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#include <malloc.h> // _aligned_malloc
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#include "crt_posix.h" // correct definitions of _open() etc.
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#include "wposix_internal.h"
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#include "wfilesystem.h" // mode_t
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#include "wtime.h" // timespec
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#include "lib/sysdep/cpu.h"
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#include "lib/bits.h"
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WINIT_REGISTER_MAIN_INIT(waio_Init);
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WINIT_REGISTER_MAIN_SHUTDOWN(waio_Shutdown);
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static void lock()
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{
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win_lock(WAIO_CS);
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}
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static void unlock()
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{
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win_unlock(WAIO_CS);
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}
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// return the largest sector size [bytes] of any storage medium
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// (HD, optical, etc.) in the system.
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//
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// this may be a bit slow to determine (iterates over all drives),
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// but caches the result so subsequent calls are free.
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// (caveat: device changes won't be noticed during this program run)
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//
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// sector size is relevant because Windows aio requires all IO
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// buffers, offsets and lengths to be a multiple of it. this requirement
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// is also carried over into the vfs / file.cpp interfaces for efficiency
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// (avoids the need for copying to/from align buffers).
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//
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// waio uses the sector size to (in some cases) align IOs if
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// they aren't already, but it's also needed by user code when
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// aligning their buffers to meet the requirements.
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//
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// the largest size is used so that we can read from any drive. while this
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// is a bit wasteful (more padding) and requires iterating over all drives,
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// it is the only safe way: this may be called before we know which
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// drives will be needed, and hardlinks may confuse things.
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size_t sys_max_sector_size()
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{
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// users may call us more than once, so cache the results.
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static DWORD cached_sector_size;
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if(cached_sector_size)
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return static_cast<size_t>(cached_sector_size);
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// currently disabled: DVDs have 2..4KB, but this causes
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// waio to unnecessarily align some file transfers (when at EOF)
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// this means that we might not be able to read from CD/DVD drives
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// (ReadFile will return error)
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// reactivated for correctness.
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// temporarily disable the "insert disk into drive" error box; we are
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// only interested in fixed drives anyway.
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//
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// note: use SetErrorMode (crappy interface, grr) twice so as not to
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// stomp on other flags (e.g. alignment exception).
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const UINT old_err_mode = SetErrorMode(0);
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SetErrorMode(old_err_mode|SEM_FAILCRITICALERRORS);
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// find maximum of all drive's sector sizes.
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const DWORD drives = GetLogicalDrives();
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char drive_str[4] = "?:\\";
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for(int drive = 2; drive <= 25; drive++) // C: .. Z:
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{
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// avoid BoundsChecker warning by skipping invalid drives
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if(!(drives & BIT(drive)))
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continue;
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drive_str[0] = (char)('A'+drive);
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DWORD spc, nfc, tnc; // don't need these
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DWORD cur_sector_size;
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if(GetDiskFreeSpace(drive_str, &spc, &cur_sector_size, &nfc, &tnc))
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cached_sector_size = std::max(cached_sector_size, cur_sector_size);
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// otherwise, it's probably an empty CD drive. ignore the
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// BoundsChecker error; GetDiskFreeSpace seems to be the
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// only way of getting at the sector size.
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}
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SetErrorMode(old_err_mode);
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// sanity check; believed to be the case for all drives.
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debug_assert(cached_sector_size % 512 == 0);
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return cached_sector_size;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// associate async-capable handle with POSIX file descriptor (int)
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//
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//////////////////////////////////////////////////////////////////////////////
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// current implementation: open file again for async access on each open();
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// wastes 1 HANDLE per file, but that's less overhead than storing the
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// filename/mode for every file and re-opening that on demand.
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//
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// note: current Windows lowio file descriptor limit is 2k
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static HANDLE* aio_hs;
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// array; expanded when needed in aio_h_set
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static int aio_hs_size;
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// often compared against fd => int
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// aio_h: no init needed.
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static void aio_h_cleanup()
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{
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lock();
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for(int i = 0; i < aio_hs_size; i++)
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{
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if(aio_hs[i] != INVALID_HANDLE_VALUE)
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{
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WARN_IF_FALSE(CloseHandle(aio_hs[i]));
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aio_hs[i] = INVALID_HANDLE_VALUE;
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}
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}
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SAFE_FREE(aio_hs);
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aio_hs_size = 0;
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unlock();
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}
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static bool is_valid_file_handle(const HANDLE h)
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{
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const bool valid = (GetFileSize(h, 0) != INVALID_FILE_SIZE);
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if(!valid)
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debug_warn("waio: invalid file handle");
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return valid;
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}
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// return true iff an aio-capable HANDLE has been attached to <fd>.
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// used by aio_close.
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static bool aio_h_is_set(const int fd)
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{
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lock();
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bool is_set = (0 <= fd && fd < aio_hs_size && aio_hs[fd] != INVALID_HANDLE_VALUE);
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unlock();
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return is_set;
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}
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// return async-capable handle associated with file <fd>
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static HANDLE aio_h_get(const int fd)
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{
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HANDLE h = INVALID_HANDLE_VALUE;
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lock();
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if(0 <= fd && fd < aio_hs_size)
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{
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h = aio_hs[fd];
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if(!is_valid_file_handle(h))
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h = INVALID_HANDLE_VALUE;
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}
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else
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debug_warn("aio_h_get: fd's aio handle not set");
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// h is already INVALID_HANDLE_VALUE
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unlock();
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return h;
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}
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// associate h (an async-capable file handle) with fd;
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// returned by subsequent aio_h_get(fd) calls.
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// setting h = INVALID_HANDLE_VALUE removes the association.
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static LibError aio_h_set(const int fd, const HANDLE h)
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{
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if(fd < 0)
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WARN_RETURN(ERR::INVALID_PARAM);
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lock();
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LibError err;
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// grow hs array to at least fd+1 entries
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if(fd >= aio_hs_size)
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{
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const uint size2 = (uint)round_up(fd+8, 8);
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HANDLE* hs2 = (HANDLE*)realloc(aio_hs, size2*sizeof(HANDLE));
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if(!hs2)
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{
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err = ERR::NO_MEM;
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goto fail;
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}
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// don't assign directly from realloc -
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// we'd leak the previous array if realloc fails.
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for(uint i = aio_hs_size; i < size2; i++)
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hs2[i] = INVALID_HANDLE_VALUE;
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aio_hs = hs2;
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aio_hs_size = size2;
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}
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if(h == INVALID_HANDLE_VALUE)
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{
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// nothing to do; will set aio_hs[fd] to INVALID_HANDLE_VALUE below.
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}
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else
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{
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// already set
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if(aio_hs[fd] != INVALID_HANDLE_VALUE)
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{
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err = ERR::LOGIC;
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goto fail;
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}
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// setting invalid handle
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if(!is_valid_file_handle(h))
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{
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err = ERR::INVALID_HANDLE;
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goto fail;
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}
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}
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aio_hs[fd] = h;
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unlock();
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return INFO::OK;
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fail:
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unlock();
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WARN_RETURN(err);
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}
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// open fn in async mode; associate with fd (retrieve via aio_h(fd))
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int aio_reopen(int fd, const char* fn, int oflag, ...)
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{
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// interpret oflag
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DWORD access = GENERIC_READ; // assume O_RDONLY
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DWORD share = FILE_SHARE_READ;
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DWORD create = OPEN_EXISTING;
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if(oflag & O_WRONLY)
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{
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access = GENERIC_WRITE;
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share = FILE_SHARE_WRITE;
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}
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else if(oflag & O_RDWR)
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{
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access |= GENERIC_WRITE;
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share |= FILE_SHARE_WRITE;
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}
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if(oflag & O_CREAT)
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create = (oflag & O_EXCL)? CREATE_NEW : CREATE_ALWAYS;
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// open file
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DWORD flags = FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING|FILE_FLAG_SEQUENTIAL_SCAN;
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WIN_SAVE_LAST_ERROR; // CreateFile
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HANDLE h = CreateFile(fn, access, share, 0, create, flags, 0);
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WIN_RESTORE_LAST_ERROR;
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if(h == INVALID_HANDLE_VALUE)
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goto fail;
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if(aio_h_set(fd, h) < 0)
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{
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CloseHandle(h);
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goto fail;
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}
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return 0;
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fail:
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debug_warn("failed");
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return -1;
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}
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int aio_close(int fd)
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{
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// early out for files that were never re-opened for AIO.
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// since there is no way for wposix close to know this, we mustn't
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// return an error (which would cause it to WARN_ERR).
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if(!aio_h_is_set(fd))
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return 0;
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HANDLE h = aio_h_get(fd);
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// out of bounds or already closed
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if(h == INVALID_HANDLE_VALUE)
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goto fail;
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if(!CloseHandle(h))
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goto fail;
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RETURN_ERR(aio_h_set(fd, INVALID_HANDLE_VALUE));
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return 0;
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fail:
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debug_warn("failed");
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return -1;
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}
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// do we want to open a second AIO-capable handle?
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static bool isAioPossible(int fd, bool is_com_port, int oflag)
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{
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// stdin/stdout/stderr
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if(fd <= 2)
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return false;
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// COM port - we don't currently need AIO access for those, and
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// aio_reopen's CreateFile would fail with "access denied".
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if(is_com_port)
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return false;
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// caller is requesting we skip it (see file_open)
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if(oflag & O_NO_AIO_NP)
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return false;
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return true;
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}
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int open(const char* fn, int oflag, ...)
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{
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const bool is_com_port = strncmp(fn, "/dev/tty", 8) == 0;
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// also used later, before aio_reopen
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// translate "/dev/tty%d" to "COM%d"
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if(is_com_port)
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{
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char port[] = "COM1";
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const char digit = fn[8]+1;
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// PCs only support COM1..COM4.
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if(!('1' <= digit && digit <= '4'))
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return -1;
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port[3] = digit;
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fn = port;
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}
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mode_t mode = 0;
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if(oflag & O_CREAT)
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{
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va_list args;
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va_start(args, oflag);
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mode = va_arg(args, mode_t);
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va_end(args);
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}
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WIN_SAVE_LAST_ERROR; // CreateFile
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int fd = _open(fn, oflag, mode);
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WIN_RESTORE_LAST_ERROR;
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// none of the above apply; now re-open the file.
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// note: this is possible because _open defaults to DENY_NONE sharing.
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if(isAioPossible(fd, is_com_port, oflag))
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WARN_ERR(aio_reopen(fd, fn, oflag));
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// CRT doesn't like more than 255 files open.
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// warn now, so that we notice why so many are open.
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#ifndef NDEBUG
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if(fd > 256)
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WARN_ERR(ERR::LIMIT);
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#endif
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return fd;
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}
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int close(int fd)
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{
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debug_assert(3 <= fd && fd < 256);
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// note: there's no good way to notify us that <fd> wasn't opened for
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// AIO, so we could skip aio_close. storing a bit in the fd is evil and
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// a fd -> info map is redundant (waio already has one).
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// therefore, we require aio_close to fail gracefully.
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WARN_ERR(aio_close(fd));
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return _close(fd);
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}
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// we don't want to #define read to _read, since that's a fairly common
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// identifier. therefore, translate from MS CRT names via thunk functions.
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// efficiency is less important, and the overhead could be optimized away.
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int read(int fd, void* buf, size_t nbytes)
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{
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return _read(fd, buf, (int)nbytes);
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}
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int write(int fd, void* buf, size_t nbytes)
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{
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return _write(fd, buf, (int)nbytes);
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}
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off_t lseek(int fd, off_t ofs, int whence)
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{
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return _lseek(fd, ofs, whence);
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// Req
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//
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//////////////////////////////////////////////////////////////////////////////
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// information about active transfers (reused)
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struct Req
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{
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// used to identify this request; != 0 <==> request valid.
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// set by req_alloc.
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aiocb* cb;
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OVERLAPPED ovl;
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// hEvent signals when transfer complete
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// align buffer - unaligned reads are padded to sector boundaries and
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// go here; the desired data is then copied into the user's buffer.
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// reused, since the Req has global lifetime; resized if too small.
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void* buf;
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size_t buf_size;
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HANDLE hFile;
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// needed to GetOverlappedResult in aio_return
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size_t pad; // offset from starting sector
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bool read_into_align_buffer;
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};
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// an aiocb is used to pass the request from caller to aio,
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// and serves as a "token" identifying the IO - its address is unique.
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// Req holds some state needed for the Windows AIO calls (OVERLAPPED).
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//
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// cb -> req (e.g. in aio_return) is accomplished by searching reqs
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// for the given cb (no problem since MAX_REQS is small).
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// req stores a pointer to its associated cb.
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const int MAX_REQS = 8;
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static Req reqs[MAX_REQS];
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static void req_cleanup(void)
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{
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Req* r = reqs;
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for(int i = 0; i < MAX_REQS; i++, r++)
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{
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HANDLE& h = r->ovl.hEvent;
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debug_assert(h != INVALID_HANDLE_VALUE);
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CloseHandle(h);
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h = INVALID_HANDLE_VALUE;
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_aligned_free(r->buf);
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r->buf = 0;
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}
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}
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|
|
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static void req_init()
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{
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for(int i = 0; i < MAX_REQS; i++)
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reqs[i].ovl.hEvent = CreateEvent(0,1,0,0); // manual reset
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// buffers are allocated on-demand.
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}
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|
|
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// return first Req with given cb field
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// (0 if searching for a free Req)
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static Req* req_find(const aiocb* cb)
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{
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Req* r = reqs;
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for(int i = 0; i < MAX_REQS; i++, r++)
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if(r->cb == cb)
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return r;
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|
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// not found
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return 0;
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}
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|
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static Req* req_alloc(aiocb* cb)
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|
{
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debug_assert(cb);
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|
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// first free Req, or 0
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Req* r = req_find(0);
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// .. found one: mark it in-use
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if(r)
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r->cb = cb;
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|
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return r;
|
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}
|
|
|
|
|
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static LibError req_free(Req* r)
|
|
{
|
|
debug_assert(r->cb != 0 && "req_free: not currently in use");
|
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r->cb = 0;
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return INFO::OK;
|
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}
|
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|
|
|
|
|
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// called by aio_read, aio_write, and lio_listio
|
|
// cb->aio_lio_opcode specifies desired operation
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//
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|
// if cb->aio_fildes doesn't support seeking (e.g. a socket),
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// cb->aio_offset must be 0.
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static int aio_rw(struct aiocb* cb)
|
|
{
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int ret = -1;
|
|
Req* r = 0;
|
|
|
|
WIN_SAVE_LAST_ERROR;
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|
|
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// no-op from lio_listio
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|
if(!cb || cb->aio_lio_opcode == LIO_NOP)
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return 0;
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|
|
|
// fail if aiocb is already in use (forbidden by SUSv3)
|
|
if(req_find(cb))
|
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{
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debug_warn("aiocb is already in use");
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goto fail;
|
|
}
|
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|
|
// extract aiocb fields for convenience
|
|
const bool is_write = (cb->aio_lio_opcode == LIO_WRITE);
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|
const int fd = cb->aio_fildes;
|
|
const size_t size = cb->aio_nbytes;
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|
const off_t ofs = cb->aio_offset;
|
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void* buf = (void*)cb->aio_buf; // from volatile void*
|
|
debug_assert(buf);
|
|
|
|
// allocate IO request
|
|
r = req_alloc(cb);
|
|
if(!r)
|
|
{
|
|
debug_warn("cannot allocate a Req (too many concurrent IOs)");
|
|
goto fail;
|
|
}
|
|
|
|
HANDLE h = aio_h_get(fd);
|
|
if(h == INVALID_HANDLE_VALUE)
|
|
{
|
|
debug_warn("associated handle is invalid");
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
|
|
r->hFile = h;
|
|
r->pad = 0;
|
|
r->read_into_align_buffer = false;
|
|
|
|
|
|
//
|
|
// align
|
|
//
|
|
|
|
// Win32 requires transfers to be sector aligned.
|
|
// we check if the transfer is aligned to sector size (the max of
|
|
// all drives in the system) and copy to/from align buffer if not.
|
|
|
|
// actual transfer parameters (possibly rounded up/down)
|
|
size_t actual_ofs = 0;
|
|
// assume socket; if file, set below
|
|
size_t actual_size = size;
|
|
void* actual_buf = buf;
|
|
|
|
const size_t sector_size = sys_max_sector_size();
|
|
|
|
// leave offset 0 if h is a socket (don't support seeking);
|
|
// otherwise, calculate aligned offset/size
|
|
const bool is_file = (GetFileType(h) == FILE_TYPE_DISK);
|
|
if(is_file)
|
|
{
|
|
// round offset down to start of previous sector, and total
|
|
// transfer size up to an integral multiple of sector_size.
|
|
r->pad = ofs % sector_size;
|
|
actual_ofs = ofs - r->pad;
|
|
actual_size = round_up(size + r->pad, sector_size);
|
|
|
|
// and whether it was ofs or buf in particular
|
|
// (needed for unaligned write handling below).
|
|
const bool ofs_misaligned = r->pad != 0;
|
|
const bool buf_misaligned = (uintptr_t)buf % sector_size != 0;
|
|
const bool misaligned = ofs_misaligned || buf_misaligned || actual_size != size;
|
|
// note: actual_size != size if ofs OR size is unaligned
|
|
|
|
// misaligned => will need to go through align buffer
|
|
// (we fail some types of misalignment for convenience; see below).
|
|
if(misaligned)
|
|
{
|
|
// expand current align buffer if too small
|
|
if(r->buf_size < actual_size)
|
|
{
|
|
void* buf2 = _aligned_realloc(r->buf, actual_size, sector_size);
|
|
if(!buf2)
|
|
{
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
r->buf = buf2;
|
|
r->buf_size = actual_size;
|
|
}
|
|
|
|
if(!is_write)
|
|
{
|
|
actual_buf = r->buf;
|
|
r->read_into_align_buffer = true;
|
|
}
|
|
else
|
|
{
|
|
// unaligned write offset: not supported.
|
|
// (we'd have to read padding, then write our data. ugh.)
|
|
if(ofs_misaligned)
|
|
{
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
// unaligned buffer: copy to align buffer and write from there.
|
|
if(buf_misaligned)
|
|
{
|
|
cpu_memcpy(r->buf, buf, size);
|
|
actual_buf = r->buf;
|
|
// clear previous contents at end of align buf
|
|
memset((char*)r->buf + size, 0, actual_size - size);
|
|
}
|
|
|
|
// unaligned size: already taken care of (we round up)
|
|
}
|
|
} // misaligned
|
|
} // is_file
|
|
|
|
// set OVERLAPPED fields
|
|
// note: Read-/WriteFile reset ovl.hEvent - no need to do that.
|
|
r->ovl.Internal = r->ovl.InternalHigh = 0;
|
|
// note: OVERLAPPED.Pointer is more convenient but not defined on VC6.
|
|
r->ovl.Offset = u64_lo(actual_ofs);
|
|
r->ovl.OffsetHigh = u64_hi(actual_ofs);
|
|
|
|
DWORD size32 = (DWORD)(actual_size & 0xFFFFFFFF);
|
|
BOOL ok;
|
|
|
|
DWORD bytes_transferred;
|
|
if(is_write)
|
|
ok = WriteFile(h, actual_buf, size32, &bytes_transferred, &r->ovl);
|
|
else
|
|
ok = ReadFile(h, actual_buf, size32, &bytes_transferred, &r->ovl);
|
|
|
|
// check result.
|
|
// .. "pending" isn't an error
|
|
if(!ok && GetLastError() == ERROR_IO_PENDING)
|
|
ok = TRUE;
|
|
// .. translate from Win32 result code to POSIX
|
|
LibError err = LibError_from_win32(ok);
|
|
if(err == INFO::OK)
|
|
ret = 0;
|
|
LibError_set_errno(err);
|
|
|
|
done:
|
|
WIN_RESTORE_LAST_ERROR;
|
|
|
|
return ret;
|
|
|
|
fail:
|
|
debug_warn("waio failure");
|
|
req_free(r);
|
|
goto done;
|
|
}
|
|
|
|
|
|
// return status of transfer
|
|
int aio_error(const struct aiocb* cb)
|
|
{
|
|
// must not pass 0 to req_find - we'd look for a free cb!
|
|
if(!cb)
|
|
{
|
|
debug_warn("invalid cb");
|
|
return -1;
|
|
}
|
|
|
|
Req* r = req_find(cb);
|
|
if(!r)
|
|
return -1;
|
|
|
|
switch(r->ovl.Internal) // I/O status
|
|
{
|
|
case 0:
|
|
return 0;
|
|
case STATUS_PENDING:
|
|
return EINPROGRESS;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
|
|
// get bytes transferred. call exactly once for each op.
|
|
ssize_t aio_return(struct aiocb* cb)
|
|
{
|
|
// must not pass 0 to req_find - we'd look for a free cb!
|
|
if(!cb)
|
|
{
|
|
debug_warn("invalid cb");
|
|
return -1;
|
|
}
|
|
|
|
Req* r = req_find(cb);
|
|
if(!r)
|
|
{
|
|
debug_warn("cb not found (already called aio_return?)");
|
|
return -1;
|
|
}
|
|
|
|
debug_assert(r->ovl.Internal == 0 && "aio_return with transfer in progress");
|
|
|
|
const BOOL wait = FALSE; // should already be done!
|
|
DWORD bytes_transferred;
|
|
if(!GetOverlappedResult(r->hFile, &r->ovl, &bytes_transferred, wait))
|
|
{
|
|
debug_warn("GetOverlappedResult failed");
|
|
return -1;
|
|
}
|
|
|
|
// we read into align buffer - copy to user's buffer
|
|
if(r->read_into_align_buffer)
|
|
cpu_memcpy((void*)cb->aio_buf, (u8*)r->buf + r->pad, cb->aio_nbytes);
|
|
|
|
// TODO: this copies data back into original buffer from align buffer
|
|
// when writing from unaligned buffer. unnecessarily slow.
|
|
|
|
req_free(r);
|
|
|
|
return (ssize_t)bytes_transferred;
|
|
}
|
|
|
|
|
|
int aio_suspend(const struct aiocb* const cbs[], int n, const struct timespec* ts)
|
|
{
|
|
int i;
|
|
|
|
if(n <= 0 || n > MAXIMUM_WAIT_OBJECTS)
|
|
return -1;
|
|
|
|
int cnt = 0; // actual number of valid cbs
|
|
HANDLE hs[MAXIMUM_WAIT_OBJECTS];
|
|
|
|
for(i = 0; i < n; i++)
|
|
{
|
|
// ignore NULL list entries
|
|
if(!cbs[i])
|
|
continue;
|
|
|
|
Req* r = req_find(cbs[i]);
|
|
if(r)
|
|
{
|
|
if(r->ovl.Internal == STATUS_PENDING)
|
|
hs[cnt++] = r->ovl.hEvent;
|
|
}
|
|
}
|
|
|
|
// no valid, pending transfers - done
|
|
if(!cnt)
|
|
return 0;
|
|
|
|
// timeout: convert timespec to ms (NULL ptr -> no timeout)
|
|
DWORD timeout = INFINITE;
|
|
if(ts)
|
|
timeout = (DWORD)(ts->tv_sec*1000 + ts->tv_nsec/1000000);
|
|
|
|
const BOOL wait_all = FALSE;
|
|
DWORD result = WaitForMultipleObjects(cnt, hs, wait_all, timeout);
|
|
|
|
for(i = 0; i < cnt; i++)
|
|
ResetEvent(hs[i]);
|
|
|
|
if(result == WAIT_TIMEOUT)
|
|
{
|
|
//errno = -EAGAIN;
|
|
return -1;
|
|
}
|
|
else
|
|
return (result == WAIT_FAILED)? -1 : 0;
|
|
}
|
|
|
|
|
|
int aio_cancel(int fd, struct aiocb* cb)
|
|
{
|
|
// Win32 limitation: can't cancel single transfers -
|
|
// all pending reads on this file are cancelled.
|
|
UNUSED2(cb);
|
|
|
|
const HANDLE h = aio_h_get(fd);
|
|
if(h == INVALID_HANDLE_VALUE)
|
|
return -1;
|
|
|
|
CancelIo(h);
|
|
return AIO_CANCELED;
|
|
}
|
|
|
|
|
|
|
|
|
|
int aio_read(struct aiocb* cb)
|
|
{
|
|
cb->aio_lio_opcode = LIO_READ;
|
|
return aio_rw(cb); // checks for cb == 0
|
|
}
|
|
|
|
|
|
int aio_write(struct aiocb* cb)
|
|
{
|
|
cb->aio_lio_opcode = LIO_WRITE;
|
|
return aio_rw(cb); // checks for cb == 0
|
|
}
|
|
|
|
|
|
int lio_listio(int mode, struct aiocb* const cbs[], int n, struct sigevent* se)
|
|
{
|
|
UNUSED2(se);
|
|
|
|
int err = 0;
|
|
|
|
for(int i = 0; i < n; i++)
|
|
{
|
|
int ret = aio_rw(cbs[i]); // checks for cbs[i] == 0
|
|
// don't RETURN_ERR yet - we want to try to issue each one
|
|
if(ret < 0 && !err)
|
|
err = ret;
|
|
}
|
|
|
|
RETURN_ERR(err);
|
|
|
|
if(mode == LIO_WAIT)
|
|
return aio_suspend(cbs, n, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int aio_fsync(int, struct aiocb*)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// init / cleanup
|
|
//
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
static LibError waio_Init()
|
|
{
|
|
req_init();
|
|
return INFO::OK;
|
|
}
|
|
|
|
|
|
static LibError waio_Shutdown()
|
|
{
|
|
req_cleanup();
|
|
aio_h_cleanup();
|
|
return INFO::OK;
|
|
}
|