[Bug #2110] bug in threading implementation using guile-1.6.1

[nobody@savannah.gnu.org]

=================== BUG #2110: LATEST MODIFICATIONS ==================
http://savannah.gnu.org/bugs/?func=detailbug&bug_id=2110&group_id=39

Changes by: Stan Pinte <stan.pinte@wanadoo.be>
Date: 2003-Jan-10 13:38 (GMT)

------------------ Additional Follow-up Comments ----------------------------
This only seems to happen when I make two calls two (gtk-main), indirectly.

-> one via the (gtk-ensure-handler) call
-> one afterwards, via the (gtk-main) call.



=================== BUG #2110: FULL BUG SNAPSHOT ===================


Submitted by: stan_pinte              Project: Guile                        
Submitted on: 2003-Jan-02 13:12
Category:  None                       Severity:  5 - Major                  
Bug Group:  None                      Resolution:  None                     
Assigned to:  None                    Status:  Open                         

Summary:  bug in threading implementation using guile-1.6.1

Original Submission:  hello,

I am using multiple threads within a guile-gtk application.

a call to (gtk-threads-ensure-handler) ensures that a first thread gets started, and
allows the rest of my program to execute. At the end of that program, I call (gtk-main), to 
wait in the Gtk event thread.

If I run my program without starting a second thread, it is ok, but as soon as I invoke 
(gtk-threads-ensure-handler), my CPU is used at 100%

NOTES:

1: I configured guile-1.6.1 using the "--with-threads" flag.
2: if I strace my process, I see this:

ioctl(7, FIONREAD, [0])                 = 0
select(32, [6 7], [], [], {0, 0})       = 1 (in [6], left {0, 0})
gettimeofday({1041338430, 454970}, NULL) = 0
gettimeofday({1041338430, 455055}, NULL) = 0
ioctl(7, FIONREAD, [0])                 = 0
select(32, [6 7], [], [], {0, 0})       = 1 (in [6], left {0, 0})
gettimeofday({1041338430, 455767}, NULL) = 0
gettimeofday({1041338430, 455852}, NULL) = 0
ioctl(7, FIONREAD, [0])                 = 0
select(32, [6 7], [], [], {0, 0})       = 1 (in [6], left {0, 0})
gettimeofday({1041338430, 456429}, NULL) = 0
gettimeofday({1041338430, 456511}, NULL) = 0
ioctl(7, FIONREAD, [0])                 = 0
select(32, [6 7], [], [], {0, 0})       = 1 (in [6], left {0, 0})
gettimeofday({1041338430, 457084}, NULL) = 0
gettimeofday({1041338430, 457166}, NULL) = 0
ioctl(7, FIONREAD, [0])                 = 0
select(32, [6 7], [], [], {0, 0})       = 1 (in [6], left {0, 0})
gettimeofday({1041338430, 459008}, NULL) = 0
gettimeofday({1041338430, 459097}, NULL) = 0
ioctl(7, FIONREAD, [0])                 = 0
select(32, [6 7], [], [], {0, 0})       = 1 (in [6], left {0, 0})
gettimeofday({1041338430, 459688}, NULL) = 0
gettimeofday({1041338430, 459771}, NULL) = 0
ioctl(7, FIONREAD, [0])                 = 0
select(32, [6 7], [], [], {0, 0})       = 1 (in [6], left {0, 0})

and so on....

--> I suspect a bug in the implementation of 

coop_wait_for_runnable_thread () in libguile/isselect.c

if (QFIRST (coop_global_sleepq)->timeoutp)
    gettimeofday (&now, NULL);
  
  return coop_wait_for_runnable_thread_now (&now);

...

thanks a lot,

Stan


Follow-up Comments
*******************

-------------------------------------------------------
Date: 2003-Jan-10 13:38             By: stan_pinte
This only seems to happen when I make two calls two (gtk-main), indirectly.

-> one via the (gtk-ensure-handler) call
-> one afterwards, via the (gtk-main) call.


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http://savannah.gnu.org/bugs/?func=detailbug&bug_id=2110&group_id=39


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