@BIF
public static EInteger trace(EProc self_proc, EObject arg0, EObject arg1, EObject arg2) {
EInternalPID pid = arg0.testInternalPID();
EAtom all = arg0.testAtom();
EObject how = arg1.testBoolean();
ESeq flags = arg2.testSeq();
if ((pid == null && all != am_all) || how == null || flags == null) {
throw ERT.badarg(arg0, arg1, arg2);
}
EInternalPID self = self_proc.self_handle();
if (all == am_all) {
ESeq allprocs = EProc.processes();
int result = allprocs.length();
global_trace_flags.update(how == ERT.TRUE, flags, self);
while (!allprocs.isNil()) {
EProc proc = allprocs.head().testInternalPID().task();
allprocs = allprocs.tail();
if (proc.trace_flags != null) {
proc.trace_flags.update(how == ERT.TRUE, flags, self);
}
}
return ERT.box(result);
} else {
EProc proc = pid.task();
if (!proc.is_alive_dirtyread()) {
return ESmall.ZERO;
}
if (proc.trace_flags == null) {
proc.trace_flags = global_trace_flags.clone();
}
proc.trace_flags.update(how == ERT.TRUE, flags, self);
return ESmall.ONE;
}
}
