Fighting the good fight.

Move libfmt, libutf into subdirectories of lib9.

Add poll-based socket i/o to libthread, so that we can
avoid using multiple procs when possible, thus removing
dependence on crappy pthreads implementations.

Convert samterm, acme to the single-proc libthread.

Bring libcomplete, acme up-to-date w.r.t. Plan 9 distribution.

src/libthread/proctab.c

@@ -6,6 +6,18 @@ enum
 	PTABHASH = 257,
 };
 
+static int multi;
+static Proc *theproc;
+
+void
+_threadmultiproc(void)
+{
+	if(multi == 0){
+		multi = 1;
+		_threadsetproc(theproc);
+	}
+}
+
 static Lock ptablock;
 Proc *ptab[PTABHASH];
 
@@ -14,6 +26,10 @@ _threadsetproc(Proc *p)
 {
 	int h;
 
+	if(!multi){
+		theproc = p;
+		return;
+	}
 	lock(&ptablock);
 	h = ((unsigned)p->pid)%PTABHASH;
 	p->link = ptab[h];
@@ -27,6 +43,9 @@ __threadgetproc(int rm)
 	Proc **l, *p;
 	int h, pid;
 
+	if(!multi)
+		return theproc;
+
 	pid = _threadgetpid();
 
 	lock(&ptablock);