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pvm_send(1) Scilab function pvm_send(1)
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 tids array. Note that the message is not sent to the caller even if
listed in the array of tids. msgtag is used to label the content of the
message. If pvm_send is successful, info will be 0. If some error occurs
then info 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 pro-
cessor. 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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