File Management Routines

  The BLAPIOS contain the following routines for handling shared and distributed files.

POPEN.

Opens a file.

PCLOSE.

Closes a file.

P_LSEEK.

Independently positions the file pointer to a specific location in the file.

P_ASEEK.

Positions the file pointers according to an explicit alignment. For a distributed file the alignment must be compatible with the data distributions of the out-of-core file and the in-core array.

P_GSEEK.

Positions the file pointers according to an implicit alignment obtained by applying a given data distribution over the out-of-core file. For a distributed file, the data distribution applied must be that of the distributed file. This is useful when it is known that a subsequent I/O operation will refer to a compatibly aligned in-core array.