bc0f60dfd9
this commit revamps the internal operations of the sharedfp components. Specifically, it is focused around removing the second file_open operation for shared file pointers. This makes the code more efficient. Because of that, there is no necessity anymore for the sharedfp_lazy_open mca parameter. Signed-off-by: Edgar Gabriel <egabriel@central.uh.edu>
93 строки
3.0 KiB
C
93 строки
3.0 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 2013-2015 University of Houston. All rights reserved.
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* Copyright (c) 2015 Cisco Systems, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "sharedfp_sm.h"
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#include "mpi.h"
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#include "ompi/constants.h"
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#include "ompi/mca/sharedfp/sharedfp.h"
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#include "ompi/mca/sharedfp/base/base.h"
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/*use a semaphore to lock the shared memory*/
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#include <semaphore.h>
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int mca_sharedfp_sm_request_position(ompio_file_t *fh,
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int bytes_requested,
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OMPI_MPI_OFFSET_TYPE *offset)
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{
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int ret = OMPI_SUCCESS;
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OMPI_MPI_OFFSET_TYPE position = 0;
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OMPI_MPI_OFFSET_TYPE old_offset;
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struct mca_sharedfp_sm_data * sm_data = NULL;
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struct mca_sharedfp_sm_offset * sm_offset_ptr = NULL;
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struct mca_sharedfp_base_data_t *sh = NULL;
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sh = fh->f_sharedfp_data;
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sm_data = sh->selected_module_data;
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*offset = 0;
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if ( mca_sharedfp_sm_verbose ) {
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opal_output(ompi_sharedfp_base_framework.framework_output,
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"Aquiring lock, rank=%d...",fh->f_rank);
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}
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sm_offset_ptr = sm_data->sm_offset_ptr;
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/* Aquire an exclusive lock */
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sem_wait(sm_data->mutex);
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if ( mca_sharedfp_sm_verbose ) {
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opal_output(ompi_sharedfp_base_framework.framework_output,
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"Succeeded! Acquired sm lock.for rank=%d\n",fh->f_rank);
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}
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old_offset=sm_offset_ptr->offset;
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if ( mca_sharedfp_sm_verbose ) {
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opal_output(ompi_sharedfp_base_framework.framework_output,
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"Read last_offset=%lld!\n",old_offset);
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}
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position = old_offset + bytes_requested;
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if ( mca_sharedfp_sm_verbose ) {
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opal_output(ompi_sharedfp_base_framework.framework_output,
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"old_offset=%lld, bytes_requested=%d, new offset=%lld!\n",old_offset,bytes_requested,position);
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}
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sm_offset_ptr->offset=position;
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if ( mca_sharedfp_sm_verbose ) {
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opal_output(ompi_sharedfp_base_framework.framework_output,
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"Releasing sm lock...rank=%d",fh->f_rank);
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}
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sem_post(sm_data->mutex);
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if ( mca_sharedfp_sm_verbose ) {
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opal_output(ompi_sharedfp_base_framework.framework_output,
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"Released lock! released lock.for rank=%d\n",fh->f_rank);
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}
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*offset = old_offset;
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return ret;
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}
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