bufinfo(3)
NAME
pvm_bufinfo() - Returns information about a message buffer.
SYNOPSIS
C int info = pvm_bufinfo( int bufid, int *bytes, int *msgtag, int *tid ) Fortran call pvmfbufinfo( bufid, bytes, msgtag, tid, info )
PARAMETERS
bufid Integer specifying a particular message buffer identifier.
- bytes Integer returning the length in bytes of the body of the mes
- sage. This will be equal to the actual size of the data packed, if PvmDataRaw is used, otherwise it may include pad bytes.
- msgtag Integer returning the message label. Useful when the message
- was received with a wildcard msgtag.
- tid Integer returning the source of the message. Useful when the
- message was received with a wildcard tid.
- info Integer status code returned by the routine. Values less than
- zero indicate an error.
DESCRIPTION
The routine pvm_bufinfo returns information about the requested message
buffer. Typically it is used to determine facts about the last received
message such as its size or source. pvm_bufinfo is especially useful
when an application is able to receive any incoming message, and the
action taken depends on the source tid and the msgtag associated with
the message that comes in first. If pvm_bufinfo is successful, info
will be 0. If some error occurs then info will be < 0.
EXAMPLES
- C:
- bufid = pvm_recv( -1, -1 );
info = pvm_bufinfo( bufid, &bytes, &type, &source ); - Fortran:
- CALL PVMFRECV( -1, -1, BUFID )
CALL PVMFBUFINFO( BUFID, BYTES, TYPE, SOURCE, INFO )
ERRORS
This error condition can be returned by pvm_bufinfo.
- PvmNoSuchBuf
- specified buffer does not exist.
- PvmBadParam
- invalid argument