lock.c

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/* 
 *
 *   Copyright (C) 1997 University of Chicago. 
 *   See COPYRIGHT notice in top-level directory.
 */

#include "adio.h"

#ifdef ROMIO_NTFS
/* This assumes that lock will always remain in the common directory and 
 * that the ntfs directory will always be called ad_ntfs. */
#include "..\ad_ntfs\ad_ntfs.h"
int ADIOI_Set_lock(FDTYPE fd, int cmd, int type, ADIO_Offset offset, int whence,
	     ADIO_Offset len) 
{
    static char myname[] = "ADIOI_Set_lock";
    int ret_val, error_code = MPI_SUCCESS;
    OVERLAPPED Overlapped;
    DWORD dwFlags;

    ADIOI_UNREFERENCED_ARG(whence);

    if (len == 0) return MPI_SUCCESS;

    dwFlags = type;

    Overlapped.hEvent = /*0;*/CreateEvent(NULL, TRUE, FALSE, NULL);
#ifdef HAVE_INT64
    Overlapped.Offset = ( (DWORD) ( offset & (__int64) 0xFFFFFFFF ) );
    Overlapped.OffsetHigh = ( (DWORD) ( (offset >> 32) & (__int64) 0xFFFFFFFF ) );

    if (cmd == ADIOI_LOCK_CMD)
    {
	/*printf("locking %d\n", (int)fd);fflush(stdout);*/
	ret_val = LockFileEx(fd, dwFlags, 0, 
	( (DWORD) ( len & (__int64) 0xFFFFFFFF ) ), 
	( (DWORD) ( (len >> 32) & (__int64) 0xFFFFFFFF ) ), 
	&Overlapped);
    }
    else
    {
	/*printf("unlocking %d\n", (int)fd);fflush(stdout);*/
	ret_val = UnlockFileEx(fd, 0, 
	( (DWORD) ( len & (__int64) 0xFFFFFFFF ) ), 
	( (DWORD) ( (len >> 32) & (__int64) 0xFFFFFFFF ) ), 
	&Overlapped);
    }
#else
    Overlapped.Offset = offset;
    Overlapped.OffsetHigh = 0;

    if (cmd == ADIOI_LOCK_CMD)
    {
	/*printf("locking %d\n", (int)fd);fflush(stdout);*/
	ret_val = LockFileEx(fd, dwFlags, 0, len, 0, &Overlapped);
    }
    else
    {
	/*printf("unlocking %d\n", (int)fd);fflush(stdout);*/
	ret_val = UnlockFileEx(fd, 0, len, 0, &Overlapped);
    }
#endif

    if (!ret_val)
    {
	/*
	FPRINTF(stderr, "File locking failed in ADIOI_Set_lock.\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
	*/
	ret_val = GetLastError();
	if (ret_val == ERROR_IO_PENDING)
	{
	    DWORD dummy;
	    ret_val = GetOverlappedResult(fd, &Overlapped, &dummy, TRUE);
	    if (ret_val)
	    {
		CloseHandle(Overlapped.hEvent);
		return MPI_SUCCESS;
	    }
	    ret_val = GetLastError();
	}
	error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, myname, __LINE__,
	    MPI_ERR_IO, "**io", "**io %s", ADIOI_NTFS_Strerror(ret_val));
    }
    CloseHandle(Overlapped.hEvent);

    return error_code;
}
#else
int ADIOI_Set_lock(FDTYPE fd, int cmd, int type, ADIO_Offset offset, int whence,
	     ADIO_Offset len) 
{
    int err, error_code;
    struct flock lock;

    if (len == 0) return MPI_SUCCESS;


    /* Depending on the compiler flags and options, struct flock 
       may not be defined with types that are the same size as
       ADIO_Offsets.  */
/* FIXME: This is a temporary hack until we use flock64 where
   available. It also doesn't fix the broken Solaris header sys/types.h
   header file, which declars off_t as a UNION ! Configure tests to
   see if the off64_t is a union if large file support is requested; 
   if so, it does not select large file support.
*/
#ifdef NEEDS_INT_CAST_WITH_FLOCK
    lock.l_type	  = type;
    lock.l_start  = (int)offset;
    lock.l_whence = whence;
    lock.l_len	  = (int)len;
#else
    lock.l_type	  = type;
    lock.l_whence = whence;
    lock.l_start  = offset;
    lock.l_len	  = len;
#endif

    do {
	err = fcntl(fd, cmd, &lock);
    } while (err && (errno == EINTR));

    if (err && (errno != EBADF)) {
	/* FIXME: This should use the error message system, 
	   especially for MPICH2 */
	FPRINTF(stderr, "File locking failed in ADIOI_Set_lock. If the file system is NFS, you need to use NFS version 3, ensure that the lockd daemon is running on all the machines, and mount the directory with the 'noac' option (no attribute caching).\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
    }

    error_code = (err == 0) ? MPI_SUCCESS : MPI_ERR_UNKNOWN;
    return error_code;
}
#endif

#if (defined(ROMIO_HFS) || defined(ROMIO_XFS))
int ADIOI_Set_lock64(FDTYPE fd, int cmd, int type, ADIO_Offset offset,
                     int whence,
	             ADIO_Offset len) 
{
    int err, error_code;
    struct flock64 lock;

    if (len == 0) return MPI_SUCCESS;

    lock.l_type = type;
    lock.l_start = offset;
    lock.l_whence = whence;
    lock.l_len = len;

    do {
	err = fcntl(fd, cmd, &lock);
    } while (err && (errno == EINTR));

    if (err && (errno != EBADF)) {
	FPRINTF(stderr, "File locking failed in ADIOI_Set_lock64\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
    }

    error_code = (err == 0) ? MPI_SUCCESS : MPI_ERR_UNKNOWN;
    return error_code;
}
#endif