| 1 | #include <cerrno>
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| 2 | #include <cstdio>
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| 3 | #include <unistd.h>
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| 4 | extern "C" {
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| 5 | #include "dis.hxx"
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| 6 | }
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| 7 |
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| 8 | struct Child {
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| 9 | int id, run, calls;
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| 10 | char name[132];
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| 11 | Child(const char* n, const char* svc) : id(0), run(0), calls(0) {
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| 12 | ::strncpy(name,n,sizeof(name));
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| 13 | id = ::dic_info_service((char*)svc,MONITORED,0,0,0,callback,(long)this,&run,sizeof(run));
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| 14 | }
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| 15 | virtual ~Child() {}
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| 16 | static void callback(void* tag, void* buffer, int* /* size */) {
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| 17 | Child* c = *(Child**)tag;
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| 18 | c->run = *(int*)buffer;
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| 19 | c->calls++;
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| 20 | }
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| 21 | };
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| 22 |
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| 23 | struct Parent {
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| 24 | int id, run, is_parent;
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| 25 | Child* children[50];
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| 26 | Parent() : id(0), run(0) {
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| 27 | is_parent = 0;
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| 28 | memset(children,0,sizeof(children));
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| 29 | id = ::dis_add_service((char*)"Parent/run",(char*)"I",&run,sizeof(run),0,0);
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| 30 | ::dis_start_serving((char*)"Parent");
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| 31 | }
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| 32 | virtual ~Parent() {}
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| 33 | void update() {
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| 34 | ++run;
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| 35 | ::dis_update_service(run);
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| 36 | }
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| 37 | void print() {
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| 38 | /*
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| 39 | size_t cnt = 0;
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| 40 | for(size_t i=0; i<sizeof(children)/sizeof(children[0]); ++i) {
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| 41 | if ( children[i]->calls > 2 ) cnt++;
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| 42 | }
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| 43 | ::printf("PID:%d Child service answers from %ld children. %ld still missing.\n",
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| 44 | ::getpid(), cnt, sizeof(children)/sizeof(children[0])-cnt);
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| 45 | */
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| 46 | }
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| 47 | void fork_em() {
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| 48 | //::dis_remove_service(id);
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| 49 | ::dis_stop_serving();
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| 50 | ::printf("Sleep a bit to see task disappear in did\n");
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| 51 | ::sleep(3);
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| 52 | for(size_t i=0; i<sizeof(children)/sizeof(children[0]); ++i) {
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| 53 | char nam[132], svc[132];
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| 54 | pid_t pid = ::fork();
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| 55 | sprintf(nam,"Child_%02ld",i);
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| 56 | sprintf(svc,"Child_%02ld/run",i);
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| 57 | if ( pid == 0 ) {
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| 58 | ::dim_init();
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| 59 | ::printf("PID:%d Register Child service Child_%02d/run to DNS....\n",::getpid(),i);
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| 60 | id = ::dis_add_service(svc,(char*)"I",&run,sizeof(run),0,0);
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| 61 | ::dis_start_serving(nam);
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| 62 | return;
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| 63 | }
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| 64 | else if ( pid > 0 ) {
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| 65 | //children[i] = new Child(nam, svc);
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| 66 | is_parent = true;
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| 67 | }
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| 68 | else {
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| 69 | ::printf("ERROR in fork!!!! %s\n",strerror(errno));
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| 70 | ::exit(0);
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| 71 | }
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| 72 | }
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| 73 | ::dim_init();
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| 74 | ::sleep(3);
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| 75 | ::printf("PID:%d RE-Register Parent to DNS....\n",::getpid());
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| 76 | id = ::dis_add_service((char*)"Parent/run",(char*)"I",&run,sizeof(run),0,0);
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| 77 | ::dis_start_serving((char*)"Parent");
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| 78 | }
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| 79 | };
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| 80 |
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| 81 | int main(int /* argc */, char** /* argv */) {
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| 82 | Parent p;
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| 83 | ::sleep(5);
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| 84 | p.fork_em();
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| 85 | while(1) {
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| 86 | p.update();
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| 87 | ::sleep(1);
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| 88 | if ( p.is_parent ) {
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| 89 | p.print();
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| 90 | }
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| 91 | }
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| 92 | ::printf("Process %d exiting\n",::getpid());
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| 93 | return 1;
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| 94 | }
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| 95 |
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| 96 |
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| 97 | /*
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| 98 |
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| 99 | g++ -o xxxx -I../../DIM/dim -ldim -lrt -pthread ../test/test_dim.cpp
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| 100 |
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| 101 | [frankm@plus04 cmt]$ ./xxxx
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| 102 | PID:20407 Register Child to DNS....
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| 103 | PID 20407 - Fri Dec 3 22:01:57 2010 - (FATAL) Child: Some Services already known to DNS
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| 104 | PID:20404 RE-Register Parent to DNS....
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| 105 |
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| 106 | */
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