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Q. Explain the Use of functions in parallel programming?
include "pvm3.h"
main()
{
int cc, tid, msgtag;
char buf[100];
printf("%x\n", pvm_mytid());
cc = pvm_spawn("hello_other", (char**)0, 0, "", 1, &tid);
if (cc == 1) {
msgtag = 1;
pvm_recv(tid, msgtag);
pvm_upkstr(buf);
printf("from t%x: %s\n", tid, buf);
} else
printf("can't start hello_other\n");
pvm_exit();
}
In this program, pvm_mytid( ) returns TID of running program (In this case task id of the program hello.c). This program is designed to be invoked manually after printing its task id (attained with pvm_mytid()), it starts a copy of other program called hello_other using pvm_spawn() function. A successful spawn makes the program to execute a blocking receive using pvm_recv. After receiving the message program prints message sent by its counterpart as well its task id the buffer is extracted from the message using pvm_upkstr. The final pvm_exit call dissociates the program from PVM system.
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