- extend the explicit offset patch to collective explicit offset operations as

well
- minor restructuring to support the shared file pointer operations correctly
  for explicit offsets

This commit was SVN r32538.

ompi/mca/io/ompio/io_ompio.h

@@ -328,6 +328,10 @@ OMPI_DECLSPEC int ompio_io_ompio_file_read_at_all_end (mca_io_ompio_file_t *ompi
                                                        ompi_status_public_t * status);
 OMPI_DECLSPEC int ompio_io_ompio_file_get_size (mca_io_ompio_file_t *fh,
                                                 OMPI_MPI_OFFSET_TYPE *size);
+
+OMPI_DECLSPEC int ompio_io_ompio_file_get_position (mca_io_ompio_file_t *fh,
+						    OMPI_MPI_OFFSET_TYPE *offset);
+
 /*
  * Function that takes in a datatype and buffer, and decodes that datatype
  * into an iovec using the convertor_raw function

ompi/mca/io/ompio/io_ompio_file_open.c

@@ -637,20 +637,31 @@ int
 mca_io_ompio_file_get_position (ompi_file_t *fd,
                                 OMPI_MPI_OFFSET_TYPE *offset)
 {
+    int ret=OMPI_SUCCESS;
     mca_io_ompio_data_t *data=NULL;
     mca_io_ompio_file_t *fh=NULL;
-    OMPI_MPI_OFFSET_TYPE off;
-
+    
     data = (mca_io_ompio_data_t *) fd->f_io_selected_data;
     fh = &data->ompio_fh;
+    
+    ret = ompio_io_ompio_file_get_position (fh, offset);
+    
+    return ret;
+}
 
-    /* No of copies of the entire file view */
+int
+ompio_io_ompio_file_get_position (mca_io_ompio_file_t *fh,
+                                OMPI_MPI_OFFSET_TYPE *offset)
+{
+    OMPI_MPI_OFFSET_TYPE off;
+    
+    /* No. of copies of the entire file view */
     off = (fh->f_offset - fh->f_disp)/fh->f_view_extent;
 
-    /* No of elements per view */
+    /* No. of elements per view */
     off *= (fh->f_view_size / fh->f_etype_size);
 
-    /* No of bytes used in the current copy of the view */
+    /* No of elements used in the current copy of the view */
     off += fh->f_total_bytes / fh->f_etype_size;
 
     *offset = off;

ompi/mca/io/ompio/io_ompio_file_read.c

@@ -174,7 +174,7 @@ int ompio_io_ompio_file_read_at (mca_io_ompio_file_t *fh,
     int ret = OMPI_SUCCESS;
     OMPI_MPI_OFFSET_TYPE prev_offset;
     
-    mca_io_ompio_file_get_position (fh->f_fh, &prev_offset );
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
     ompi_io_ompio_set_explicit_offset (fh, offset);
     ret = ompio_io_ompio_file_read (fh,
@@ -308,8 +308,7 @@ int ompio_io_ompio_file_iread_at (mca_io_ompio_file_t *fh,
 {
     int ret = OMPI_SUCCESS;
     OMPI_MPI_OFFSET_TYPE prev_offset;
-    
-    mca_io_ompio_file_get_position (fh->f_fh, &prev_offset );
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
     ompi_io_ompio_set_explicit_offset (fh, offset);
     ret = ompio_io_ompio_file_iread (fh,
@@ -386,6 +385,8 @@ int ompio_io_ompio_file_read_at_all (mca_io_ompio_file_t *fh,
 				     ompi_status_public_t * status)
 {
     int ret = OMPI_SUCCESS;
+    OMPI_MPI_OFFSET_TYPE prev_offset;
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
     ompi_io_ompio_set_explicit_offset (fh, offset);
     ret = fh->f_fcoll->fcoll_file_read_all (fh,
@@ -393,6 +394,8 @@ int ompio_io_ompio_file_read_at_all (mca_io_ompio_file_t *fh,
                                             count,
                                             datatype,
                                             status);
+
+    ompi_io_ompio_set_explicit_offset (fh, prev_offset);
     return ret;
 }
 
@@ -556,20 +559,28 @@ int mca_io_ompio_file_read_at_all_begin (ompi_file_t *fh,
     return ret;
 }
 
-int ompio_io_ompio_file_read_at_all_begin (mca_io_ompio_file_t *ompio_fh,
+int ompio_io_ompio_file_read_at_all_begin (mca_io_ompio_file_t *fh,
 					   OMPI_MPI_OFFSET_TYPE offset,
 					   void *buf,
 					   int count,
 					   struct ompi_datatype_t *datatype)
 {
     int ret = OMPI_SUCCESS;
+    OMPI_MPI_OFFSET_TYPE prev_offset;
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
-    ompi_io_ompio_set_explicit_offset (ompio_fh, offset);
-    ret = ompio_fh->f_fcoll->fcoll_file_read_all_begin (ompio_fh,
-                                                        buf,
-                                                        count,
-                                                        datatype);
-
+    ompi_io_ompio_set_explicit_offset (fh, offset);
+    ret = fh->f_fcoll->fcoll_file_read_all_begin (fh,
+						  buf,
+						  count,
+						  datatype);
+    
+    /* It is OK to reset the position already here, althgouth 
+    ** the operation might still be pending/ongoing, since
+    ** the entire array of <offset, length, memaddress> have 
+    ** already been constructed in the file_read_all_begin operation
+    */
+    ompi_io_ompio_set_explicit_offset (fh, prev_offset);
     return ret;
 }
 

ompi/mca/io/ompio/io_ompio_file_write.c

@@ -169,7 +169,7 @@ int ompio_io_ompio_file_write_at (mca_io_ompio_file_t *fh,
 {
     int ret = OMPI_SUCCESS;
     OMPI_MPI_OFFSET_TYPE prev_offset;
-    mca_io_ompio_file_get_position (fh->f_fh, &prev_offset );
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
     ompi_io_ompio_set_explicit_offset (fh, offset);
     ret = ompio_io_ompio_file_write (fh,
@@ -297,7 +297,7 @@ int ompio_io_ompio_file_iwrite_at (mca_io_ompio_file_t *fh,
 {
     int ret = OMPI_SUCCESS;
     OMPI_MPI_OFFSET_TYPE prev_offset;
-    mca_io_ompio_file_get_position (fh->f_fh, &prev_offset );
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
     ompi_io_ompio_set_explicit_offset (fh, offset);
     ret = ompio_io_ompio_file_iwrite (fh,
@@ -498,6 +498,8 @@ int ompio_io_ompio_file_write_at_all (mca_io_ompio_file_t *fh,
 				      ompi_status_public_t *status)
 {
     int ret = OMPI_SUCCESS;
+    OMPI_MPI_OFFSET_TYPE prev_offset;
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
     ompi_io_ompio_set_explicit_offset (fh, offset);
     ret = fh->f_fcoll->fcoll_file_write_all (fh,
@@ -505,6 +507,8 @@ int ompio_io_ompio_file_write_at_all (mca_io_ompio_file_t *fh,
                                              count,
                                              datatype,
                                              status);
+
+    ompi_io_ompio_set_explicit_offset (fh, prev_offset);
     return ret;
 }
 
@@ -640,6 +644,8 @@ int ompio_io_ompio_file_write_at_all_begin (mca_io_ompio_file_t *fh,
 					    struct ompi_datatype_t *datatype)
 {
     int ret = OMPI_SUCCESS;
+    OMPI_MPI_OFFSET_TYPE prev_offset;
+    ompio_io_ompio_file_get_position (fh, &prev_offset );
 
     ompi_io_ompio_set_explicit_offset (fh, offset);
     ret = fh->f_fcoll->fcoll_file_write_all_begin (fh,
@@ -647,6 +653,12 @@ int ompio_io_ompio_file_write_at_all_begin (mca_io_ompio_file_t *fh,
                                                    count,
                                                    datatype);
 
+    /* It is OK to reset the position already here, althgouth 
+    ** the operation might still be pending/ongoing, since
+    ** the entire array of <offset, length, memaddress> have 
+    ** already been constructed in the file_write_all_begin operation
+    */
+    ompi_io_ompio_set_explicit_offset (fh, prev_offset);
     return ret;
 }