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From: Jeremy F. <je...@go...> - 2004-01-18 08:32:14
|
On Sat, 2004-01-17 at 13:38, Doug Rabson wrote: > There are some reasonable descriptions of the userland interface in the > kse(2) manpage. I imagine a few of the hairy details might still be > locked in the developer's heads but the manpage is a good place to get > started. OK. I had a bit of a look at that, but now that I've got FreeBSD 5 running under VMware, I'll get more of a chance. Hm, I just found http://www.freebsd.org/kse/ which seems to have everything. > Well I don't expect any real programs except a pthread implementation to > actually use these interfaces so perhaps its not a problem. On the other > hand we don't get to interpose our own libpthread for statically linked > programs. Regardless, I imagine the people implementing libpthread using > the KSE syscalls might find it useful to have a version of valgrind that > they can use to validate their work. Well, there are definitely real programs which use clone() directly under Linux, and there have been requests to implement clone to support them. So that's already in the plan. There are also problems of secret, private, highly-version-dependent interfaces between libpthread and glibc which I don't think we can support in any dependable way. So using the native libpthread is becoming more appealing for that reason. The downside is that it becomes much harder to guess what the thread state of a particular thread is if we only look at the syscall stream coming out of it ("why has it blocked? is it waiting on a mutex? or something else?"). As you say, another benefit of this is that we instrument libpthread itself (and we've certainly found enough strange things in glibc). But that's all a digression. I was actually talking about making Valgrind itself use libpthread to manage its concurrency (ie, your patch), and how we can multiplex Valgrind's libpthread demands and the client's kernel/libpthread demands. > I think thats right but I haven't delved too deeply into it. I think the > existing signal router should do the job - are there any valgrind test > cases that test that particular feature? Don't think so particularly. I've only been consistently adding regression tests for bugs recently. J |