mirror of https://github.com/BOINC/boinc.git
261 lines
7.9 KiB
C
261 lines
7.9 KiB
C
// The contents of this file are subject to the Mozilla Public License
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// Version 1.0 (the "License"); you may not use this file except in
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// compliance with the License. You may obtain a copy of the License at
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// http://www.mozilla.org/MPL/
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//
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// Software distributed under the License is distributed on an "AS IS"
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// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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// License for the specific language governing rights and limitations
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// under the License.
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//
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// The Original Code is the Berkeley Open Infrastructure for Network Computing.
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//
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// The Initial Developer of the Original Code is the SETI@home project.
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// Portions created by the SETI@home project are Copyright (C) 2002
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// University of California at Berkeley. All Rights Reserved.
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//
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// Contributor(s):
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//
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// feeder [-asynch]
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//
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// Creates a shared memory segment containing DB info,
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// including results/workunits to send.
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// This means that the scheduler CGI program doesn't have to
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// access the DB to get this info.
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//
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// -asynch fork and run in a separate process
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// TODO:
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// - check for wu/results that don't get sent for a long time;
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// generate a warning message
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// Trigger files:
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// The feeder program periodically checks for two trigger files:
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//
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// stop_server: destroy shmem and exit
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// leave trigger file there (for other daemons)
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// reread_db: update DB contents in existing shmem
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// delete trigger file
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// If you get an "Invalid argument" error when trying to run the feeder,
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// it is likely that you aren't able to allocate enough shared memory.
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// Either increase the maximum shared memory segment size in the kernel
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// configuration, or decrease the MAX_PLATFORMS, MAX_APPS
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// MAX_APP_VERSIONS, and MAX_WU_RESULTS in sched_shmem.h
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "db.h"
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#include "shmem.h"
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#include "util.h"
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#include "config.h"
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#include "sched_shmem.h"
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#include "sched_util.h"
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#define RESULTS_PER_ENUM 100
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#define REREAD_DB_FILENAME "reread_db"
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#define LOCKFILE "feeder.out"
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CONFIG config;
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int check_triggers(SCHED_SHMEM* ssp) {
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FILE* f;
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f = fopen(STOP_TRIGGER_FILENAME, "r");
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if (f) {
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fclose(f);
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detach_shmem((void*)ssp);
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destroy_shmem(config.shmem_key);
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exit(0);
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}
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f = fopen(REREAD_DB_FILENAME, "r");
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if (f) {
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fclose(f);
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ssp->init();
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ssp->scan_tables();
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unlink(REREAD_DB_FILENAME);
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}
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return 0;
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}
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// Try keep the wu_results array filled.
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// This is actually a little tricky.
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// We use an enumerator.
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// The inner loop scans the wu_result table,
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// looking for empty slots and trying to fill them in.
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// When the enumerator reaches the end, it is restarted;
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// hopefully there will be some new workunits.
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// There are two complications:
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// - An enumeration may return results already in the array.
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// So, for each result, we scan the entire array to make sure
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// it's not there already. Can this be streamlined?
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// - We must avoid excessive re-enumeration,
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// especially when the number of results is less than the array size.
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// Crude approach: if a "collision" (as above) occurred on
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// a pass through the array, wait a long time (5 sec)
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//
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void feeder_loop(SCHED_SHMEM* ssp) {
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int i, j, nadditions, ncollisions, retval;
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RESULT result;
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WORKUNIT wu;
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bool no_wus, collision, restarted_enum;
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char buf[256];
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while (1) {
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nadditions = 0;
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ncollisions = 0;
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no_wus = false;
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restarted_enum = false;
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for (i=0; i<ssp->nwu_results; i++) {
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if (!ssp->wu_results[i].present) {
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try_again:
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result.server_state = RESULT_SERVER_STATE_UNSENT;
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retval = db_result_enum_server_state(result, RESULTS_PER_ENUM);
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if (retval) {
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// if we already restarted the enum on this pass,
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// there's no point in doing it again.
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//
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if (restarted_enum) {
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write_log("already restarted enum on this pass\n");
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break;
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}
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// restart the enumeration
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//
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restarted_enum = true;
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result.server_state = RESULT_SERVER_STATE_UNSENT;
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retval = db_result_enum_server_state(result, RESULTS_PER_ENUM);
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write_log("restarting enumeration\n");
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if (retval) {
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write_log("enumeration restart returned nothing\n");
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no_wus = true;
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break;
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}
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}
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if (result.server_state != RESULT_SERVER_STATE_UNSENT) {
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sprintf(buf, "RESULT STATE CHANGED: %s\n", result.name);
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write_log(buf);
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goto try_again;
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}
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collision = false;
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for (j=0; j<ssp->nwu_results; j++) {
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if (ssp->wu_results[j].present
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&& ssp->wu_results[j].result.id == result.id
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) {
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ncollisions++;
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collision = true;
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break;
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}
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}
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if (!collision) {
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sprintf(buf, "adding result %d in slot %d\n", result.id, i);
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write_log(buf);
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retval = db_workunit(result.workunitid, wu);
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if (retval) {
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sprintf(buf, "can't read workunit %d: %d\n", result.workunitid, retval);
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write_log(buf);
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continue;
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}
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ssp->wu_results[i].result = result;
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ssp->wu_results[i].workunit = wu;
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ssp->wu_results[i].present = true;
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nadditions++;
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}
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}
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}
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ssp->ready = true;
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if (nadditions == 0) {
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write_log("no results added\n");
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sleep(1);
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} else {
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sprintf(buf, "added %d results to array\n", nadditions);
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write_log(buf);
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}
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if (no_wus) {
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write_log("feeder: no results available\n");
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sleep(5);
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}
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if (ncollisions) {
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write_log("feeder: some results already in array - sleeping\n");
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sleep(5);
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}
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fflush(stdout);
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check_triggers(ssp);
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}
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}
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int main(int argc, char** argv) {
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SCHED_SHMEM* ssp;
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int i, retval;
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bool asynch = false;
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void* p;
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char buf[256];
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unlink(REREAD_DB_FILENAME);
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retval = config.parse_file();
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if (retval) {
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write_log("can't parse config file\n");
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exit(1);
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}
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for (i=1; i<argc; i++) {
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if (!strcmp(argv[i], "-asynch")) {
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asynch = true;
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}
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}
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if (asynch) {
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if (fork()!=0) {
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exit(0);
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}
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}
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// Call lock_file after fork(), because file locks are not always inherited
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if (lock_file(LOCKFILE)) {
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fprintf(stderr, "Another copy of feeder is already running\n");
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exit(1);
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}
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retval = destroy_shmem(config.shmem_key);
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if (retval) {
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write_log("can't destroy shmem\n");
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exit(1);
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}
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retval = create_shmem(config.shmem_key, sizeof(SCHED_SHMEM), &p);
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if (retval) {
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write_log("can't create shmem\n");
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exit(1);
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}
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ssp = (SCHED_SHMEM*)p;
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ssp->init();
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retval = boinc_db_open(config.db_name, config.db_passwd);
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if (retval) {
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sprintf(buf, "boinc_db_open: %d\n", retval);
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write_log(buf);
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exit(1);
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}
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ssp->scan_tables();
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printf(
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"feeder: read\n"
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"%d platforms\n"
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"%d apps\n"
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"%d app_versions\n",
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ssp->nplatforms,
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ssp->napps,
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ssp->napp_versions
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);
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feeder_loop(ssp);
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}
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