Hi, folks, I am having some difficulty in understanding the usage
difference between hythread_xxx() procedures and tmn_xxx() series for
thread suspension control.
1). Looks like they are used interchangeably (?) .
For example,
In file vm/vmcore/src/init/vm_init.cpp,
576: hythread_suspend_enable();
577: exn_print_stack_trace(stderr, exn_get());
578: hythread_suspend_disable();
In file vm/vmcore/src/exception/exceptions.cpp,
619: tmn_suspend_disable();
620:
621: ManagedObject *exn = exc->object;
622: exn_native_print_stack_trace(f, exn);
623:
624: tmn_suspend_enable();
2). A code snippet I can't understand:
In file vm/vmcore/src/exception/exceptions.cpp,
549: inline void exn_native_print_stack_trace(FILE * f, ManagedObject * exn)
550: {
551:
552: assert(hythread_is_suspend_enabled());
If we see the line 552 here and line 619 above (both in
exceptions.cpp), we may find they are contraditory (?) . The flow
disables suspension and calls into a function which requires
suspension enabled. Why is that?
Can DRLVM thread guy please give some explantions on the two questions?
Thanks,
xiaofeng
--
http://xiao-feng.blogspot.com
