runq: clean up code, fix error handling.
Runq spawns a number of processes, and wait()s for them in 2 different places. Because of the way that the exit handling is done, the wait can get the wrong message. It turns out that only one place in the code needs to wait for the child, and in all other cases, it's just muddling the problem. This change adds the RFNOWAIT call to all the processes we don't need to wait for, so that the places that do need wait will always get the correct child.
This commit is contained in:
Ori Bernstein
parent
34ed7f7aa2
commit
49d7ca8d92
1 changed files with 46 additions and 52 deletions
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@ -3,6 +3,7 @@
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typedef struct Job Job;
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typedef struct Wdir Wdir;
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typedef struct Wpid Wpid;
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struct Wdir {
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Dir *d;
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@ -41,6 +42,8 @@ char *root;
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int debug;
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int giveup = 2*24*60*60;
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int limit;
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Wpid *waithd;
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Wpid *waittl;
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char *runqlog = "runq";
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@ -196,6 +199,7 @@ rundir(char *name)
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int nlive, fidx, fd, found;
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Job *hd, *j, **p;
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Waitmsg *w;
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Mlock *l;
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Wdir wd;
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fd = open(".", OREAD);
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@ -203,28 +207,31 @@ rundir(char *name)
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warning("reading %s", name);
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return;
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}
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if((l = syslock("./rundir")) == nil){
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warning("locking %s", name);
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close(fd);
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return;
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}
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fidx= 0;
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hd = nil;
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nlive = 0;
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wd.name = name;
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wd.nd = dirreadall(fd, &wd.d);
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while(nlive > 0 || fidx< wd.nd){
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while(fidx< wd.nd && nlive < njob){
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if(strncmp(wd.d[fidx].name, "C.", 2) != 0){
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fidx++;
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for(; fidx< wd.nd && nlive < njob; fidx++){
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if(strncmp(wd.d[fidx].name, "C.", 2) != 0)
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continue;
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if((j = dofile(&wd, &wd.d[fidx])) == nil){
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if(debug) fprint(2, "skipping %s: %r\n", wd.d[fidx].name);
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continue;
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}
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if((j = dofile(&wd, &wd.d[fidx])) != nil){
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nlive++;
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j->next = hd;
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hd = j;
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}
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fidx++;
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}
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if(nlive == 0){
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fprint(2, "nothing live\n");
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/* nothing to do */
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if(nlive == 0)
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break;
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}
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rescan:
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if((w = wait()) == nil){
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syslog(0, "runq", "wait error: %r");
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@ -240,12 +247,15 @@ rescan:
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}
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}
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free(w);
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if(!found)
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if(!found){
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syslog(0, runqlog, "wait: pid not in job list");
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goto rescan;
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}
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}
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assert(hd == nil);
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free(wd.d);
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close(fd);
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sysunlock(l);
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}
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/*
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@ -257,7 +267,6 @@ remmatch(Wdir *w, char *name)
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long i;
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syslog(0, runqlog, "removing %s/%s", w->name, name);
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for(i=0; i<w->nd; i++){
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if(strcmp(&w->d[i].name[1], &name[1]) == 0)
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remove(w->d[i].name);
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@ -286,7 +295,7 @@ keeplockalive(char *path, int fd)
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snprint(l->name, sizeof l->name, "%s", path);
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/* fork process to keep lock alive until sysunlock(l) */
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switch(l->pid = rfork(RFPROC)){
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switch(l->pid = rfork(RFPROC|RFNOWAIT)){
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default:
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break;
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case 0:
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@ -313,8 +322,7 @@ dofile(Wdir *w, Dir *dp)
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Dir *d;
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char *cp;
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if(debug)
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fprint(2, "dofile %s\n", dp->name);
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if(debug) fprint(2, "dofile %s\n", dp->name);
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/*
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* if no data file or empty control or data file, just clean up
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* the empty control file must be 15 minutes old, to minimize the
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@ -344,14 +352,18 @@ dofile(Wdir *w, Dir *dp)
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free(d);
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if(etime - dtime < 60*60){
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/* up to the first hour, try every 15 minutes */
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if(time(0) - etime < 15*60)
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if(time(0) - etime < 15*60){
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werrstr("early retry");
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return nil;
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}
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} else {
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/* after the first hour, try once an hour */
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if(time(0) - etime < 60*60)
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if(time(0) - etime < 60*60){
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werrstr("early retry");
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return nil;
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}
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}
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}
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/*
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* open control and data
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@ -363,18 +375,11 @@ dofile(Wdir *w, Dir *dp)
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j->dp = dp;
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j->dfd = -1;
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j->b = sysopen(file(dp->name, 'C'), "rl", 0660);
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if(j->b == 0) {
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if(debug)
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fprint(2, "can't open %s: %r\n", file(dp->name, 'C'));
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return nil;
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}
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if(j->b == 0)
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goto done;
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j->dfd = open(file(dp->name, 'D'), OREAD);
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if(j->dfd < 0){
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if(debug)
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fprint(2, "can't open %s: %r\n", file(dp->name, 'D'));
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freejob(j);
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return nil;
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}
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if(j->dfd < 0)
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goto done;
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/*
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* make arg list
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@ -431,15 +436,20 @@ dofile(Wdir *w, Dir *dp)
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}
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for(i = 0; i < nbad; i++){
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if(j->ac > 3 && strcmp(j->av[3], badsys[i]) == 0)
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if(j->ac > 3 && strcmp(j->av[3], badsys[i]) == 0){
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werrstr("badsys: %s", j->av[3]);
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goto done;
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}
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}
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/*
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* Ken's fs, for example, gives us 5 minutes of inactivity before
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* the lock goes stale, so we have to keep reading it.
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*/
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j->l = keeplockalive(file(dp->name, 'C'), Bfildes(j->b));
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if(j->l == nil){
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warning("lock file", 0);
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goto done;
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}
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/*
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* transfer
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@ -498,7 +508,6 @@ donefile(Job *j, Waitmsg *wm)
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if(debug)
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fprint(2, "wm->pid %d wm->msg == %s\n", wm->pid, wm->msg);
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if(wm->msg[0]){
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if(debug)
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fprint(2, "[%d] wm->msg == %s\n", getpid(), wm->msg);
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@ -566,9 +575,8 @@ int
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returnmail(char **av, Wdir *w, char *name, char *msg)
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{
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char buf[256], attachment[Pathlen], *sender;
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int i, fd, pfd[2];
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int fd, pfd[2];
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long n;
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Waitmsg *wm;
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String *s;
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if(av[1] == 0 || av[2] == 0){
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@ -589,7 +597,7 @@ returnmail(char **av, Wdir *w, char *name, char *msg)
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return -1;
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}
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switch(rfork(RFFDG|RFPROC|RFENVG)){
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switch(rfork(RFFDG|RFPROC|RFENVG|RFNOWAIT)){
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case -1:
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logit("runq - fork failed", w, name, av);
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return -1;
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@ -625,27 +633,13 @@ returnmail(char **av, Wdir *w, char *name, char *msg)
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break;
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if(write(pfd[1], buf, n) != n){
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close(fd);
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goto out;
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return -1;
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}
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}
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close(fd);
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}
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close(pfd[1]);
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out:
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wm = wait();
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if(wm == nil){
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syslog(0, "runq", "wait: %r");
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logit("wait failed", w, name, av);
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return -1;
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}
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i = 0;
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if(wm->msg[0]){
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i = -1;
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syslog(0, "runq", "returnmail child: %s", wm->msg);
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logit("returnmail child failed", w, name, av);
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}
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free(wm);
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return i;
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return 0;
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}
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/*
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