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On Sun, Jul 18, 2010 at 12:24:00PM -0700, Eliot Miranda wrote:
<snip>
> In Cog platforms/unix/vm/sqUnixMain.c you'll find code to cause SIGUSR1 to
> print all stacks. This can easily be ported to the standard VM. Is the
> above with Cog or the standard VM?
It would be best not to tie printAllStacks() to a specific signal, because
SIGUSR1 is often used by third-party libraries that may be embedded in
plugins or called through FFI. Perhaps it could be to enabled via a command
line option if it is going to be part of the VM proper.
But the feature also seemed like a reasonable fit for OSProcessPlugin,
so I added it to OSPP and OSProcess (SqueakSource latest versions).
OSPP already had a mechanism for forwarding arbitrary unix signals to
Smalltalk semaphores, so the printAllStacks() hook is embedded into that
framework. The updates are:
OSProcessPlugin 4.3.4
Add #primitivePrintAllStacksOnSignal to attach the printAllStacks()
interpreter debugging function to a unix signal. Intended for debugging
support to enable SIGUSR1 to trigger a stack trace on console output.
OSProcess 4.3.13
Implement debugging stack dump methods:
UnixOSProcessAccessor>>setPrintAllStacksOnSigUsr1
UnixOSProcessAccessor>>clearPrintAllStacksOnSigUsr1
UnixOSProcessAccessor>>primPrintAllStacksOnSignal:
To enable printAllStacks() on receipt of a SIGUSR1 signal:
OSProcess accessor setPrintAllStacksOnSigUsr1
To disable printAllStacks() and restore the default SIGUSR1 handler:
OSProcess accessor clearPrintAllStacksOnSigUsr1
Dave
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