From c12b430997567f3d68ec8e7ba76674f20c27441b Mon Sep 17 00:00:00 2001

From: Jakub Filak <jfilak@redhat.com>

Date: Fri, 7 Feb 2014 17:54:14 +0100

Subject: [ABRT PATCH 11/11] upload-watch: remove busy-wait for SIGUSR1

Unconditional checking of SIGUSR1 flag in the idle source of main loop

causes 100% CPU usage.

hanle_sigusr() function and got_sigusr flag are not necessary because

abrt-upload-watch already implements signal handling based on usage of

GIO Channels.

Closes rhbz#1060020

Signed-off-by: Jakub Filak <jfilak@redhat.com>

---

 src/daemon/abrt-upload-watch.c | 37 +++++++++----------------------------

 1 file changed, 9 insertions(+), 28 deletions(-)

diff --git a/src/daemon/abrt-upload-watch.c b/src/daemon/abrt-upload-watch.c

index 59bfbe4..a42b285 100644

--- a/src/daemon/abrt-upload-watch.c

+++ b/src/daemon/abrt-upload-watch.c

@@ -27,7 +27,6 @@

 #define DEFAULT_CACHE_MIB_SIZE 4

 static int g_signal_pipe[2];

-static sig_atomic_t got_sigusr;

 struct queue

 {

@@ -122,24 +121,11 @@ handle_new_path(struct process *proc, char *name)

     }

 }

-static gboolean

+static void

 print_stats(struct process *proc)

 {

-    /* there is a race, because we run this function from 2 different places

-     * 1st when a child dies

-     * 2nd as idle source from mainloop

-     * if it happens the stats will be printed twice, which I think

-     * is not a big deal, because it's only for debug and tests

-     */

-    if (got_sigusr == 1)

-    {

-        got_sigusr = 0;

-        /* this is meant only for debugging, so not marking it as translatable */

-        fprintf(stderr, "%i archives to process, %i active workers\n", g_queue_get_length(&proc->queue.q), proc->children);

-    }

-

-    /* don't remove this source from glib */

-    return true;

+    /* this is meant only for debugging, so not marking it as translatable */

+    fprintf(stderr, "%i archives to process, %i active workers\n", g_queue_get_length(&proc->queue.q), proc->children);

 }

 static void

@@ -157,13 +143,6 @@ process_next_in_queue(struct process *proc)

 }

 static void

-handle_sigusr(int signo)

-{

-    /* just set the flag and process it synchronously */

-    got_sigusr = 1;

-}

-

-static void

 handle_signal(int signo)

 {

     int save_errno = errno;

@@ -200,7 +179,11 @@ handle_signal_pipe_cb(GIOChannel *gio, GIOCondition condition, gpointer user_dat

         {

             /* we did receive a signal */

             log_debug("Got signal %d through signal pipe", signals[signo]);

-            if (signals[signo] != SIGCHLD)

+            if (signals[signo] == SIGUSR1)

+            {

+                print_stats(proc);

+            }

+            else if (signals[signo] != SIGCHLD)

             {

                 process_quit(proc);

                 return FALSE; /* remove this event */

@@ -363,7 +346,7 @@ main(int argc, char **argv)

     close_on_exec_on(g_signal_pipe[1]);

     ndelay_on(g_signal_pipe[0]);

     ndelay_on(g_signal_pipe[1]);

-    signal(SIGUSR1, handle_sigusr);

+    signal(SIGUSR1, handle_signal);

     signal(SIGTERM, handle_signal);

     signal(SIGINT, handle_signal);

     signal(SIGCHLD, handle_signal);

@@ -373,7 +356,6 @@ main(int argc, char **argv)

                 handle_signal_pipe_cb,

                 &proc;;

-    int status_callback_source_id = g_idle_add((GSourceFunc)print_stats, &proc;;

     log_info("Starting glib main loop");

     g_main_loop_run(proc.main_loop);

@@ -381,7 +363,6 @@ main(int argc, char **argv)

     log_info("Glib main loop finished");

     g_source_remove(channel_signal_source_id);

-    g_source_remove(status_callback_source_id);

     GError *error = NULL;

     g_io_channel_shutdown(channel_signal, FALSE, &error);

-- 

1.8.3.1