added configuration file option and command line option to set pthread stacksize #66

diff --git a/src/main.c b/src/main.c
index 12b4148b7c90062ad484b874e20538074e0a523f..a1b278f494bdb043ba6e209863f11b76c7635fdf 100755 (executable)
--- a/src/main.c
+++ b/src/main.c
@@ -190,6 +190,8 @@ int main(int argc, char **argv)
        int i;
        int config_loaded = 0;
        int dont_fork = 0;
+       size_t wanted_stacksize = 0, stacksize = 0;
+       pthread_attr_t attr;
 
        // global initialization
        get_HZ();
@@ -216,6 +218,7 @@ int main(int argc, char **argv)
                else if(strcmp(argv[i], "-l")  == 0 && (i+1) < argc) { config_set("global", "history",      argv[i+1]); i++; }
                else if(strcmp(argv[i], "-t")  == 0 && (i+1) < argc) { config_set("global", "update every", argv[i+1]); i++; }
                else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) { config_set("global", "host access prefix", argv[i+1]); i++; }
+               else if(strcmp(argv[i], "-stacksize") == 0 && (i+1) < argc) { config_set("global", "pthread stack size", argv[i+1]); i++; }
                else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) dont_fork = 1;
                else if(strcmp(argv[i], "--unittest")  == 0) {
                        rrd_update_every = 1;
@@ -235,6 +238,7 @@ int main(int argc, char **argv)
                        fprintf(stderr, "  -ch path to access host /proc and /sys when running in a container. Default: empty.\n");
                        fprintf(stderr, "  -nd or -nodeamon to disable forking in the background. Default: unset.\n");
                        fprintf(stderr, "  -df FLAGS debug options. Default: 0x%08llx.\n", debug_flags);
+                       fprintf(stderr, "  -stacksize BYTES to overwrite the pthread stack size.\n");
                        exit(1);
                }
        }
@@ -374,6 +378,20 @@ int main(int argc, char **argv)
 
                // --------------------------------------------------------------------
 
+               i = pthread_attr_init(&attr);
+               if(i != 0)
+                       fatal("pthread_attr_init() failed with code %d.", i);
+
+               i = pthread_attr_getstacksize(&attr, &stacksize);
+               if(i != 0)
+                       fatal("pthread_attr_getstacksize() failed with code %d.", i);
+               else
+                       debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
+
+               wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
+
+               // --------------------------------------------------------------------
+
                for (i = 0; static_threads[i].name != NULL ; i++) {
                        struct netdata_static_thread *st = &static_threads[i];
 
@@ -455,6 +473,20 @@ int main(int argc, char **argv)
                }
        }
 
+       // ------------------------------------------------------------------------
+       // get default pthread stack size
+
+       if(stacksize < wanted_stacksize) {
+               i = pthread_attr_setstacksize(&attr, wanted_stacksize);
+               if(i != 0)
+                       fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
+               else
+                       info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
+       }
+
+       // ------------------------------------------------------------------------
+       // spawn the threads
+
        for (i = 0; static_threads[i].name != NULL ; i++) {
                struct netdata_static_thread *st = &static_threads[i];
 
@@ -465,7 +497,7 @@ int main(int argc, char **argv)
 
                        info("Starting thread %s.", st->name);
 
-                       if(pthread_create(st->thread, NULL, st->start_routine, NULL))
+                       if(pthread_create(st->thread, &attr, st->start_routine, NULL))
                                error("failed to create new thread for %s.", st->name);
 
                        else if(pthread_detach(*st->thread))