GNU/Linux man pages
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GNU/Linux |
RedHat 6.2(Zoot) |
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pvm_probe(3) |
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pvm_probe − Check if message has arrived.
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C |
int bufid = pvm_probe( int tid, int msgtag ) |
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Fortran |
call pvmfprobe( tid, msgtag, bufid ) |
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tid |
Integer task identifier of sending process supplied by the user. | ||
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msgtag |
Integer message tag supplied by the user. msgtag should be >= 0. | ||
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bufid |
Integer returning the value of the new active receive buffer identifier. Values less than zero indicate an error. |
The routine pvm_probe checks to see if a message with label msgtag has arrived from tid. If a matching message has arrived pvm_probe returns a buffer identifier in bufid. This bufid can be used with pvm_bufinfo to determine information about the message such as its source and length.
If the requested message has not arrived, then pvm_probe returns with a 0 in bufid. If some error occurs bufid will be < 0.
A -1 in msgtag or tid matches anything. This allows the user the following options. If tid = -1 and msgtag is defined by the user, then pvm_probe will accept a message from any process which has a matching msgtag. If msgtag = -1 and tid is defined by the user, then pvm_probe will accept any message that is sent from process tid. If tid = -1 and msgtag = -1, then pvm_probe will accept any message from any process.
pvm_probe can be called multiple times to check if a given message has arrived yet. After the message has arrived, pvm_recv must be called before the message can be unpacked into the user’s memory using the unpack routines.
C:
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tid = pvm_parent(); |
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msgtag = 4 ; |
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arrived = pvm_probe( tid, msgtag ); |
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if ( arrived ) |
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info = pvm_bufinfo( arrived, &len, &tag, &tid ); | |||
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else |
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/* go do other computing */ |
Fortran:
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CALL PVMFPROBE( -1, 4, ARRIVED ) |
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IF ( ARRIVED .GT. 0 ) THEN |
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CALL PVMFBUFINFO( ARRIVED, LEN, TAG, TID, INFO ) | |||
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ELSE |
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* |
GO DO USEFUL WORK | ||
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ENDIF |
These error
conditions can be returned by pvm_probe.
PvmBadParam
giving an invalid tid value or msgtag.
PvmSysErr
pvmd not responding.
pvm_bufinfo(3PVM), pvm_getminfo(3PVM), pvm_nrecv(3PVM), pvm_recv(3PVM), pvm_unpack(3PVM)
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pvm_probe(3) | |