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pvm_send Scilab // Group Scilab function pvm_send
NAME
pvm_send - immediately sends (or multicast) data.
CALLING SEQUENCE
[info] = pvm_send(tids,buff,msgtag)
PARAMETERS
tids : row of integers, contains the task IDs of the tasks to be sent
to.
buff : scilab variable.
msgtag : integer, message tag supplied by the user. msgtag should be
>= 0. It allows the user's program to distinguish between different
kinds of messages .
info : integer, status code returned by the routine. Values less than
zero indicate an error.
DESCRIPTION
pvm_send sends (or multicasts) a message to the PVM process identified
in the
array. Note that the message is not sent to the caller even if listed in
the array of tids.
is used to label the content of the message. If pvm_send is successful,
will be 0. If some error occurs then
will be < 0.
The pvm_send routine is asynchronous. Computation on the sending
processor resumes as soon as the message is safely on its way to the
receiving processor. This is in contrast to synchronous communication,
during which computation on the sending processor halts until the
matching receive is executed by the receiving processor.
If a multicast is performed, pvm_send first determines which other pvmds
contain the specified tasks. Then passes the message to these pvmds
which in turn distribute the message to their local tasks without further
network traffic.
The PVM model guarantees the following about message order. If task 1
sends message A to task 2, then task 1 sends message B to task 2, message
A will arrive at task 2 before message B. Moreover, if both messages
arrive before task 2 does a receive, then a wildcard receive will always
return message A.
Terminating a PVM task immediately after sending a message or messages
from it may result in those messages being lost. To be sure, always call
pvm_exit() before stopping.
EXAMPLE
A = rand(5,5)*(1+%i);
deff('[x]=f(y)','x = 1/y')
info = pvm_send([262150, 262152], A(1:2:5,:), 100)
pvm_send(262146,f,200)
SEE ALSO
pvm_recv, pvm_bcast
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