routesearch: concurrency limit

[ypp-sc-tools.db-live.git] / yarrg / rsmain.c

diff --git a/yarrg/rsmain.c b/yarrg/rsmain.c
index 437a13d35d837f552b229f100374bc5fd9699075..774f507e309857db3c603463ed276920a1c8bdb4 100644 (file)
--- a/yarrg/rsmain.c
+++ b/yarrg/rsmain.c
@@ -31,6 +31,8 @@ int main(int argc, const char **argv) {
   int i, ap;
   int granui;
   const char *database=0;
+  const char *concur_base=0, *concur_rhs=0;
+  int concur_lim=-1;
 
 #ifndef debug_flags
   debug_flags= ~( dbg_sql2 );
@@ -41,6 +43,10 @@ int main(int argc, const char **argv) {
     if (arg[0] != '-') break;
     if (!strcmp(arg,"-d")) {
       database= *++argv;
+    } else if (!strcmp(arg,"-C")) {
+      concur_base= *++argv;
+      concur_rhs= *++argv;
+      concur_lim= atoi(*++argv);
     } else if (!strcmp(arg,"-g")) {
       granus= atoi(*++argv);
       assert(granus>=1 && granus<=GRANUS);
@@ -92,6 +98,28 @@ int main(int argc, const char **argv) {
 
   min_trade_maxprofit= atoi(*argv++);
 
+  if (concur_base) {
+    for (i=0; i<concur_lim; i++) {
+      char *concfn= masprintf("%s%02d%s", concur_base, i, concur_rhs);
+      int concfd, r;
+      sysassert( (concfd= open(concfn, O_RDWR|O_CREAT|O_TRUNC, 0600)) >= 0);
+      struct flock fl;
+      memset(&fl,0,sizeof(fl));
+      fl.l_type= F_WRLCK;
+      r= fcntl(concfd, F_SETLK, &fl);
+      free(concfn);
+      if (!r) goto concur_ok;
+      sysassert( errno == EWOULDBLOCK );
+      close(concfd);
+    }
+    fprintf(output,"@@@ concurrency limit exceeded (%d)\n", concur_lim);
+    exit(0);
+
+  concur_ok:
+    /* deliberately leak concfd */
+    fprintf(output,"concurrency slot %d\n", i);
+  }
+
   setup_sql(database);
   setup_value();
   setup_search();