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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* Copyright (C) 1997 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include "ad_nfs.h"
/* returns the current location of the shared_fp in terms of the
no. of etypes relative to the current view, and also increments the
shared_fp by the number of etypes to be accessed (incr) in the read
or write following this function. */
void ADIOI_NFS_Get_shared_fp(ADIO_File fd, ADIO_Offset incr, ADIO_Offset *shared_fp,
int *error_code)
{
ADIO_Offset new_fp;
ssize_t err;
MPI_Comm dupcommself;
static char myname[] = "ADIOI_NFS_GET_SHARED_FP";
if (fd->shared_fp_fd == ADIO_FILE_NULL) {
MPI_Comm_dup(MPI_COMM_SELF, &dupcommself);
fd->shared_fp_fd = ADIO_Open(MPI_COMM_SELF, dupcommself,
fd->shared_fp_fname,
fd->file_system,
fd->fns,
ADIO_CREATE | ADIO_RDWR | ADIO_DELETE_ON_CLOSE,
0, MPI_BYTE, MPI_BYTE, MPI_INFO_NULL,
ADIO_PERM_NULL, error_code);
if (*error_code != MPI_SUCCESS) return;
*shared_fp = 0;
ADIOI_WRITE_LOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_read_a, 0, NULL );
#endif
err = read(fd->shared_fp_fd->fd_sys, shared_fp, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_read_b, 0, NULL );
#endif
/* if the file is empty, the above read may return error
(reading beyond end of file). In that case, shared_fp = 0,
set above, is the correct value. */
}
else {
ADIOI_WRITE_LOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_lseek_a, 0, NULL );
#endif
err = lseek(fd->shared_fp_fd->fd_sys, 0, SEEK_SET);
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_lseek_b, 0, NULL );
#endif
if (err == 0) {
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_read_a, 0, NULL );
#endif
err = read(fd->shared_fp_fd->fd_sys, shared_fp,
sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_read_b, 0, NULL );
#endif
}
if (err == -1) {
ADIOI_UNLOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
*error_code = MPIO_Err_create_code(MPI_SUCCESS,
MPIR_ERR_RECOVERABLE, myname,
__LINE__, MPI_ERR_IO, "**io",
"**io %s", strerror(errno));
return;
}
}
if (incr == 0) {goto done;}
new_fp = *shared_fp + incr;
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_lseek_a, 0, NULL );
#endif
err = lseek(fd->shared_fp_fd->fd_sys, 0, SEEK_SET);
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_lseek_b, 0, NULL );
#endif
if (err == 0) {
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_write_a, 0, NULL );
#endif
err = write(fd->shared_fp_fd->fd_sys, &new_fp, sizeof(ADIO_Offset));
#ifdef ADIOI_MPE_LOGGING
MPE_Log_event( ADIOI_MPE_write_b, 0, NULL );
#endif
}
done:
ADIOI_UNLOCK(fd->shared_fp_fd, 0, SEEK_SET, sizeof(ADIO_Offset));
if (err == -1) {
*error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
myname, __LINE__, MPI_ERR_IO,
"**io",
"**io %s", strerror(errno));
}
else *error_code = MPI_SUCCESS;
}
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