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bug in threading implementation, using guile-1.6.1
From: |
Stan Pinte |
Subject: |
bug in threading implementation, using guile-1.6.1 |
Date: |
Tue, 31 Dec 2002 13:44:24 +0100 |
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
--
Stanislas Pinte
Computer Consultant
Alto Software
20 Pl St Jacques
B-4000 Liège
web: http://www.altosw.be
email: address@hidden
- bug in threading implementation, using guile-1.6.1,
Stan Pinte <=