Re: After use g_io_add_watch , the cpu usage to 100%

[Paul Davis <paul linuxaudiosystems com>]

You need to actually read whatever data is available.

On Tue, Dec 15, 2015 at 12:32 AM, <Neil Wu emerson com> wrote:

Hi, Paul

Thank you for your reply.  I don’t know how to clean the “data ready” condition on the socket. Please help me know how to do it.

 

Thanks

Neil

 

From: Paul Davis [mailto:paul linuxaudiosystems com]
Sent: Tuesday, December 15, 2015 11:33 AM
To: Wu, Neil [CLIMATE/RS/CN]
Cc: ML-gtk
Subject: Re: After use g_io_add_watch , the cpu usage to 100%

 

You're probably not clearing the "data ready" condition on the socket in the callback. As soon as you return to main event loop, the socket still has data ready.

 

On Mon, Dec 14, 2015 at 10:07 PM, <Neil Wu emerson com> wrote:

Hi, all

 

I upload the glib-2.0 library  from 2.38.2 to 2.44.1, then the cpu usage to 100%.

After testing , I find the problem is caused by g_io_add_watch function. Following is the part code about the glib.

 

               struct sockaddr_can addr;

                struct ifreq ifr;

                int loopback = 0;

                gint fd;

                GIOChannel *io;

                guint ev_id;

 

                if (getenv("CANLOOPBACK"))

                                loopback = 1;

 

                memset(&addr, 0, sizeof(addr));

                memset(&ifr, 0, sizeof(ifr));

                fd = socket(PF_CAN, SOCK_RAW, CAN_RAW)                   

 

                addr.can_family = AF_CAN;

 

                strcpy(ifr.ifr_name,”can0”);

ioctl(fd, SIOCGIFINDEX, &ifr

                addr.can_ifindex = ifr.ifr_ifindex;

 

                setsockopt(dcan->fd, SOL_CAN_RAW, CAN_RAW_LOOPBACK, &loopback, sizeof(loopback));

 

                 bind(dcan->fd, (struct sockaddr *) &addr, sizeof(addr))

                 io = g_io_channel_unix_new(fd);

                g_assert(io);

                g_io_channel_set_encoding(io, NULL, NULL);

                g_io_channel_set_buffered(io, FALSE);

                ev_id = g_io_add_watch(io, G_IO_IN, NULL, NULL); / ev_id = g_io_add_watch(io, G_IO_IN, my_function, NULL);

 

If any people know how to solve the problem, or any information may lead to this problem, please tell me .   Thanks very much

 

Neil

 

 

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