Introduce channels

Makefile

@@ -24,7 +24,7 @@ dump: ovni.o dump.o parson.o
 
 test_speed: test_speed.c ovni.o parson.o
 
-emu: emu.o emu_ovni.o emu_nosv.o emu_nosv_ss.o ovni.o prv.o pcf.o parson.o
+emu: emu.o emu_ovni.o emu_nosv.o emu_nosv_ss.o ovni.o prv.o pcf.o parson.o chan.o
 
 libovni.so: ovni.o parson.o
 	$(LINK.c) -shared $^ -o $@

chan.c

@@ -0,0 +1,176 @@
+#include <assert.h>
+
+#include "emu.h"
+#include "prv.h"
+
+void
+chan_init(struct ovni_chan *chan, int row, int type, FILE *prv, int64_t *clock)
+{
+	chan->n = 0;
+	chan->type = type;
+	chan->enabled = 0;
+	chan->badst = ST_NULL;
+	chan->ev = -1;
+	chan->prv = prv;
+	chan->clock = clock;
+	chan->t = -1;
+	chan->row = row;
+	chan->dirty = 0;
+}
+
+void
+chan_enable(struct ovni_chan *chan, int enabled)
+{
+	chan->enabled = enabled;
+}
+
+int
+chan_is_enabled(struct ovni_chan *chan)
+{
+	return chan->enabled;
+}
+
+void
+chan_set(struct ovni_chan *chan, int st)
+{
+	dbg("chan_set st=%d", st);
+
+	assert(chan->enabled);
+	assert(chan->dirty == 0);
+
+	if(chan->n == 0)
+		chan->n = 1;
+
+	chan->stack[chan->n] = st;
+	chan->t = *chan->clock;
+	chan->dirty = 1;
+}
+
+void
+chan_push(struct ovni_chan *chan, int st)
+{
+	dbg("chan_push st=%d", st);
+
+	assert(chan->enabled);
+	assert(chan->dirty == 0);
+
+	if(chan->n >= MAX_CHAN_STACK)
+	{
+		err("channel stack full\n");
+		exit(EXIT_FAILURE);
+	}
+
+	chan->stack[chan->n++] = st;
+	chan->t = *chan->clock;
+	chan->dirty = 1;
+}
+
+int
+chan_pop(struct ovni_chan *chan, int expected_st)
+{
+	int st;
+
+	dbg("chan_pop expexted_st=%d", expected_st);
+
+	assert(chan->enabled);
+	assert(chan->dirty == 0);
+
+	if(chan->n <= 0)
+	{
+		err("channel empty\n");
+		exit(EXIT_FAILURE);
+	}
+
+	st = chan->stack[chan->n - 1];
+
+	if(expected_st >= 0 && st != expected_st)
+	{
+		err("unexpected channel state %d (expected %d)\n",
+				st, expected_st);
+		exit(EXIT_FAILURE);
+	}
+
+	chan->n--;
+	chan->t = *chan->clock;
+	chan->dirty = 1;
+
+	return st;
+}
+
+void
+chan_ev(struct ovni_chan *chan, int ev)
+{
+	assert(chan->enabled);
+	assert(chan->dirty == 0);
+	assert(ev >= 0);
+
+	chan->ev = ev;
+	chan->t = *chan->clock;
+	chan->dirty = 1;
+}
+
+int
+chan_get_st(struct ovni_chan *chan)
+{
+	if(chan->enabled == 0)
+		return chan->badst;
+
+	assert(chan->n > 0);
+	return chan->stack[chan->n-1];
+}
+
+static void
+emit_ev(struct ovni_chan *chan)
+{
+	int new, last;
+
+	assert(chan->enabled);
+	assert(chan->ev != -1);
+
+	new = chan->ev;
+	last = chan_get_st(chan);
+
+	prv_ev(chan->prv, chan->row, chan->t-1, chan->type, new);
+	prv_ev(chan->prv, chan->row, chan->t, chan->type, last);
+
+	chan->ev = -1;
+}
+
+static void
+emit_st(struct ovni_chan *chan)
+{
+	int st;
+
+	assert(chan->enabled);
+
+	st = chan_get_st(chan);
+
+	prv_ev(chan->prv, chan->row, chan->t, chan->type, st);
+}
+
+/* Emits either the current state or punctual event in the PRV file */
+void
+chan_emit(struct ovni_chan *chan)
+{
+	if(chan->dirty == 0)
+		return;
+
+	/* Emit badst if disabled */
+	if(chan->enabled == 0)
+	{
+		/* No punctual events allowed when disabled */
+		assert(chan->ev == -1);
+
+		emit_st(chan);
+		goto shower;
+	}
+
+	/* Otherwise, emit punctual event if any or the state */
+	if(chan->ev != -1)
+		emit_ev(chan);
+	else
+		emit_st(chan);
+
+shower:
+	chan->dirty = 0;
+}

chan.h

@@ -0,0 +1,33 @@
+#ifndef OVNI_CHAN_H
+#define OVNI_CHAN_H
+
+#include "emu.h"
+
+void
+chan_init(struct ovni_chan *chan, int row, int type, FILE *prv, int64_t *clock);
+
+void
+chan_enable(struct ovni_chan *chan, int enabled);
+
+int
+chan_is_enabled(struct ovni_chan *chan);
+
+void
+chan_set(struct ovni_chan *chan, int st);
+
+void
+chan_push(struct ovni_chan *chan, int st);
+
+int
+chan_pop(struct ovni_chan *chan, int expected_st);
+
+void
+chan_ev(struct ovni_chan *chan, int ev);
+
+int
+chan_get_st(struct ovni_chan *chan);
+
+void
+chan_emit(struct ovni_chan *chan);
+
+#endif /* OVNI_CHAN_H */

emu.c

@@ -17,6 +17,7 @@
 #include "emu.h"
 #include "prv.h"
 #include "pcf.h"
+#include "chan.h"
 
 /* Obtains the corrected clock of the given event */
 int64_t
@@ -75,6 +76,18 @@ find_thread(struct ovni_eproc *proc, pid_t tid)
 	return NULL;
 }
 
+static void
+emit_channels(struct ovni_emu *emu)
+{
+	struct ovni_ethread *th;
+	int i;
+
+	th = emu->cur_thread;
+
+	for(i=0; i<CHAN_MAX; i++)
+		chan_emit(&th->chan[i]);
+}
+
 static void
 hook_pre(struct ovni_emu *emu)
 {
@@ -99,6 +112,8 @@ hook_emit(struct ovni_emu *emu)
 {
 	//emu_emit(emu);
 
+	emit_channels(emu);
+
 	switch(emu->cur_ev->header.model)
 	{
 		case 'O': hook_emit_ovni(emu);
@@ -665,6 +680,44 @@ emu_virtual_ev(struct ovni_emu *emu, char *mcv)
 	trace->nvirtual++;
 }
 
+static void
+init_thread(struct ovni_emu *emu, struct ovni_ethread *th)
+{
+	int i, row;
+
+	row = th->gindex + 1;
+
+	for(i=0; i<CHAN_MAX; i++)
+	{
+		chan_init(&th->chan[i], row, type, emu->prv_thread,
+				&emu->delta_clock);
+	}
+}
+
+static void
+init_threads(struct ovni_emu *emu)
+{
+	struct ovni_loom *loom;
+	struct ovni_eproc *proc;
+	struct ovni_ethread *thread;
+	int i, j, k;
+
+	for(i=0; i<trace->nlooms; i++)
+	{
+		loom = &trace->loom[i];
+		for(j=0; j<loom->nprocs; j++)
+		{
+			proc = &loom->proc[j];
+			for(k=0; k<proc->nthreads; k++)
+			{
+				thread = &proc->thread[k];
+
+				init_thread(emu, thread);
+			}
+		}
+	}
+}
+
 static void
 emu_init(struct ovni_emu *emu, int argc, char *argv[])
 {
@@ -689,6 +742,8 @@ emu_init(struct ovni_emu *emu, int argc, char *argv[])
 
 	open_prvs(emu, emu->tracedir);
 	open_pcfs(emu, emu->tracedir);
+
+	init_threads(emu);
 }
 
 static void

emu.h

@@ -64,7 +64,54 @@ struct nosv_task_type {
 	UT_hash_handle hh;
 };
 
-#define MAX_SS_STACK 128
+#define MAX_CHAN_STACK 128
+
+struct ovni_chan {
+	/* Number of states in the stack */
+	int n;
+
+	/* Stack of states */
+	int stack[MAX_CHAN_STACK];
+
+	/* 1 if enabled, 0 if not. */
+	int enabled;
+
+	/* What state should be shown in errors */
+	int badst;
+
+	/* Punctual event: -1 if not used */
+	int ev;
+
+	/* Emit events of this type */
+	int type;
+
+	/* A pointer to a clock to sample the time */
+	int64_t *clock;
+
+	/* The time of the last state or event */
+	int64_t t;
+
+	/* Paraver row */
+	int row;
+
+	/* 1 if channel needs flush to PRV */
+	int dirty;
+
+	/* Where should the events be written to? */
+	FILE *prv;
+};
+
+enum chan {
+	/* Ovni */
+	CHAN_OVNI_STATE = 0,
+	CHAN_OVNI_TID,
+	CHAN_OVNI_PID,
+
+	/* nOS-V */
+	CHAN_NOSV_TASK_ID,
+	CHAN_NOSV_SS, /* Subsystem */
+	CHAN_MAX
+};
 
 /* All PRV event types */
 enum prv_type {
@@ -105,22 +152,14 @@ struct ovni_ethread {
 	/* Current cpu */
 	struct ovni_cpu *cpu;
 
-	/* Number of subsystem states in the stack */
-	int nss;
-
-	/* Stack of subsystem states */
-	int ss[MAX_SS_STACK];
-
-	int ss_event;
-
 	/* FIXME: Use a table with registrable pointers to custom data
 	 * structures */
 
 	/* nosv task */
 	struct nosv_task *task;
 
-	/* Should we print the subsystem? */
-	int show_ss;
+	/* Channels are used to output the emulator state in PRV */
+	struct ovni_chan chan[CHAN_MAX];
 };
 
 /* State of each emulated process */
@@ -180,10 +219,6 @@ struct ovni_cpu {
 	/* The threads the cpu is currently running */
 	size_t nthreads;
 	struct ovni_ethread *thread[OVNI_MAX_THR];
-
-	///* Each channel emits events in the PRV file */
-	//int nchannels;
-	//struct ovni_channel *channel;
 };
 
 /* ----------------------- trace ------------------------ */

emu_nosv.c

@@ -5,6 +5,7 @@
 #include "ovni_trace.h"
 #include "emu.h"
 #include "prv.h"
+#include "chan.h"
 
 enum nosv_prv_type {
 	PRV_TYPE_PROCID
@@ -15,6 +16,28 @@ struct hook_entry {
 	void (*hook)(struct ovni_emu *);
 };
 
+/* --------------------------- init ------------------------------- */
+
+void
+hook_nosv_init(struct ovni_emu *emu)
+{
+	struct ovni_ethread *th;
+	int i, row, type;
+	FILE *prv;
+	int64_t *clock;
+
+	for(i=0; i<emu->total_nthreads; i++)
+	{
+		th = emu->global_thread[i];
+		row = th->gindex + 1;
+
+		//chan_init(struct ovni_chan *chan, int row, int type, FILE *prv, int64_t *clock)
+
+		chan_init(th->chan[CHAN_NOSV_TASK_ID], row, PTT_TASK_ID, prv,
+				clock);
+	}
+}
+
 /* --------------------------- pre ------------------------------- */
 
 static void
@@ -286,6 +309,11 @@ emit_task(struct ovni_emu *emu)
 void
 hook_emit_nosv(struct ovni_emu *emu)
 {
+	struct ovni_ethread *th;
+	int i;
+
+	th = emu->cur_thread;
+
 	switch(emu->cur_ev->header.class)
 	{
 		case 'T': emit_task(emu); break;

emu_nosv_ss.c

@@ -5,6 +5,7 @@
 #include "ovni_trace.h"
 #include "emu.h"
 #include "prv.h"
+#include "chan.h"
 
 /* This module manages the nos-v subsystem (ss) events, to track which
  * actions are being performed by each thread at a given time. A stack
@@ -12,94 +13,34 @@
  * execution. Events such as task received by a thread are emitted as
  * fake events with very short period. */
 
-
-/* --------------------------- ss helpers ------------------------------- */
-
-static void
-ss_init(struct ovni_ethread *t)
-{
-	t->nss = 0;
-	t->show_ss = 0;
-}
-
-static void
-ss_push(struct ovni_ethread *t, int st)
-{
-	if(t->nss >= MAX_SS_STACK)
-	{
-		err("thread %d subsystem stack full\n", t->tid);
-		exit(EXIT_FAILURE);
-	}
-
-	t->ss[t->nss] = st;
-	t->nss++;
-}
-
-static int
-ss_pop(struct ovni_ethread *t, int expected_st)
-{
-	int st;
-
-	if(t->nss <= 0)
-	{
-		err("thread %d subsystem stack empty\n", t->tid);
-		exit(EXIT_FAILURE);
-	}
-
-	st = t->ss[t->nss - 1];
-
-	if(st > 0 && st != expected_st)
-	{
-		err("thread %d expected subsystem state %d (got %d)\n",
-				t->tid, expected_st, st);
-		exit(EXIT_FAILURE);
-	}
-
-	t->nss--;
-
-	return st;
-}
-
-static void
-ss_ev(struct ovni_ethread *th, int ev)
-{
-	th->ss_event = ev;
-}
-
-static int
-ss_last_st(struct ovni_ethread *th)
-{
-	if(th->nss == 0)
-		return ST_NULL;
-
-	return th->ss[th->nss - 1];
-}
-
 /* --------------------------- pre ------------------------------- */
 
 static void
 pre_sched(struct ovni_emu *emu)
 {
 	struct ovni_ethread *th;
+	struct ovni_chan *chan;
 
 	th = emu->cur_thread;
+	chan = &th->chan[CHAN_NOSV_SS];
+
 	switch(emu->cur_ev->header.value)
 	{
 		case 'h':
-			ss_push(th, ST_SCHED_HUNGRY);
+			chan_push(chan, ST_SCHED_HUNGRY);
 			break;
 		case 'f': /* Fill: no longer hungry */
-			ss_pop(th, ST_SCHED_HUNGRY);
+			chan_pop(chan, ST_SCHED_HUNGRY);
 			break;
 		case '[': /* Server enter */
-			ss_push(th, ST_SCHED_SERVING);
+			chan_push(chan, ST_SCHED_SERVING);
 			break;
 		case ']': /* Server exit */
-			ss_pop(th, ST_SCHED_SERVING);
+			chan_pop(chan, ST_SCHED_SERVING);
 			break;
-		case '@': ss_ev(th, EV_SCHED_SELF); break;
-		case 'r': ss_ev(th, EV_SCHED_RECV); break;
-		case 's': ss_ev(th, EV_SCHED_SEND); break;
+		case '@': chan_ev(chan, EV_SCHED_SELF); break;
+		case 'r': chan_ev(chan, EV_SCHED_RECV); break;
+		case 's': chan_ev(chan, EV_SCHED_SEND); break;
 		default:
 			break;
 	}
@@ -109,12 +50,15 @@ static void
 pre_submit(struct ovni_emu *emu)
 {
 	struct ovni_ethread *th;
+	struct ovni_chan *chan;
 
 	th = emu->cur_thread;
+	chan = &th->chan[CHAN_NOSV_SS];
+
 	switch(emu->cur_ev->header.value)
 	{
-		case '[': ss_push(th, ST_SCHED_SUBMITTING); break;
-		case ']': ss_pop(th, ST_SCHED_SUBMITTING); break;
+		case '[': chan_push(chan, ST_SCHED_SUBMITTING); break;
+		case ']': chan_pop(chan, ST_SCHED_SUBMITTING); break;
 		default:
 			  break;
 	}
@@ -124,94 +68,30 @@ static void
 pre_memory(struct ovni_emu *emu)
 {
 	struct ovni_ethread *th;
+	struct ovni_chan *chan;
 
 	th = emu->cur_thread;
+	chan = &th->chan[CHAN_NOSV_SS];
+
 	switch(emu->cur_ev->header.value)
 	{
-		case '[': ss_push(th, ST_MEM_ALLOCATING); break;
-		case ']': ss_pop(th, ST_MEM_ALLOCATING); break;
+		case '[': chan_push(chan, ST_MEM_ALLOCATING); break;
+		case ']': chan_pop(chan, ST_MEM_ALLOCATING); break;
 		default:
 			  break;
 	}
 }
 
-/* Hook for the virtual "thread changed" event */
-static void
-pre_thread_change(struct ovni_emu *emu)
-{
-	struct ovni_ethread *th;
-
-	th = emu->cur_thread;
-
-	/* Only print the subsystem if the thread is running */
-	if(th->state == TH_ST_RUNNING)
-		th->show_ss = 1;
-	else
-		th->show_ss = 0;
-}
-
-static void
-pre_thread(struct ovni_emu *emu)
-{
-	switch(emu->cur_ev->header.value)
-	{
-		case 'c': pre_thread_change(emu); break;
-		default:
-			break;
-	}
-}
-
-/* Hook for the virtual "cpu changed" event */
-static void
-pre_cpu_change(struct ovni_emu *emu)
-{
-	struct ovni_ethread *th;
-
-	th = emu->cur_thread;
-
-	/* Only print the subsystem if the thread is running */
-	if(th->state == TH_ST_RUNNING)
-		th->show_ss = 1;
-	else
-		th->show_ss = 0;
-}
-
-static void
-pre_cpu(struct ovni_emu *emu)
-{
-	switch(emu->cur_ev->header.value)
-	{
-		case 'c': pre_thread_change(emu); break;
-		default:
-			break;
-	}
-}
-
 void
 hook_pre_nosv_ss(struct ovni_emu *emu)
 {
-	switch(emu->cur_ev->header.model)
+	assert(emu->cur_ev->header.model == 'V');
+
+	switch(emu->cur_ev->header.class)
 	{
-		/* Listen for virtual events as well */
-		case '*':
-			switch(emu->cur_ev->header.class)
-			{
-				case 'H': pre_thread(emu); break;
-				case 'C': pre_cpu(emu); break;
-				default:
-					break;
-			}
-			break;
-		case 'V':
-			switch(emu->cur_ev->header.class)
-			{
-				case 'S': pre_sched(emu); break;
-				case 'U': pre_submit(emu); break;
-				case 'M': pre_memory(emu); break;
-				default:
-					break;
-			}
-			break;
+		case 'S': pre_sched(emu); break;
+		case 'U': pre_submit(emu); break;
+		case 'M': pre_memory(emu); break;
 		default:
 			break;
 	}
@@ -219,173 +99,15 @@ hook_pre_nosv_ss(struct ovni_emu *emu)
 
 /* --------------------------- emit ------------------------------- */
 
-static void
-emit_thread_state(struct ovni_emu *emu, struct ovni_ethread *th,
-		int type, int st)
-{
-	int row;
-
-	row = th->gindex + 1;
-
-	prv_ev_thread(emu, row, type, st);
-}
-
-static void
-emit_cpu_state(struct ovni_emu *emu, struct ovni_ethread *th,
-		int type, int st)
-{
-	/* Detect multiple threads */
-	if(th->cpu && th->cpu->nthreads > 1)
-		st = ST_BAD;
-	
-	prv_ev_autocpu(emu, type, st);
-}
-
-static void
-emit_thread_event(struct ovni_emu *emu, struct ovni_ethread *th,
-		int type, int st)
-{
-	int64_t t0, t1;
-	int row;
-	int prev_st;
-
-	row = th->gindex + 1;
-
-	t0 = emu->delta_time - 1;
-	t1 = emu->delta_time;
-
-	prev_st = ss_last_st(th);
-
-	/* Fake event using 1 nanosecond in the past */
-	prv_ev_thread_raw(emu, row, t0, type, st);
-	prv_ev_thread_raw(emu, row, t1, type, prev_st);
-}
-
-static void
-emit_cpu_event(struct ovni_emu *emu, struct ovni_ethread *th,
-		int type, int st)
-{
-	int64_t t0, t1;
-	int row;
-	int prev_st;
-
-	row = th->gindex + 1;
-
-	t0 = emu->delta_time - 1;
-	t1 = emu->delta_time;
-
-	prev_st = ss_last_st(th);
-
-	/* Detect multiple threads */
-	if(th->cpu && th->cpu->nthreads > 1)
-	{
-		st = ST_BAD;
-		prev_st = ST_BAD;
-	}
-
-	/* Fake event using 1 nanosecond in the past */
-	prv_ev_autocpu_raw(emu, t0, type, st);
-	prv_ev_autocpu_raw(emu, t1, type, prev_st);
-}
-
-static void
-emit_thread_changed(struct ovni_emu *emu)
-{
-	dbg("emit_thread_changed\n")
-}
-
-static void
-emit_cpu_changed(struct ovni_emu *emu)
-{
-	dbg("emit_cpu_changed\n")
-	//int i;
-	//struct ovni_loom *loom;
-	//struct ovni_cpu *cpu;
-
-	///* Detect multiple threads */
-	//loom = emu->cur_loom;
-
-	//assert(loom->nupdated_cpus > 0);
-
-	//for(i=0; i<loom->nupdated_cpus; i++)
-	//{
-	//	cpu = loom->updated_cpu[i];
-
-	//	if(cpu->nthreads > 1)
-	//	{
-	//		prv_stream_disable(cpu->ss_stream);
-	//	}
-	//}
-}
-
 void
 hook_emit_nosv_ss(struct ovni_emu *emu)
 {
-	/* We need to emit events when a thread notifies us that the subsystem
-	 * has changed, but also when the thread is paused, or scheduled to
-	 * another CPU, as the CPU view must be updated as well. */
-
-	switch(emu->cur_ev->header.model)
-	{
-	/* Listen for virtual events as well */
-	case '*':
-		switch(emu->cur_ev->header.class)
-		{
-		case 'H':
-			switch(emu->cur_ev->header.value)
-			{
-			case 'c': emit_thread_changed(emu); break;
-			default: break;
-			}
-			break;
-		case 'C':
-			switch(emu->cur_ev->header.value)
-			{
-			case 'c': emit_cpu_changed(emu); break;
-			default: break;
-			}
-			break;
-		default: break;
-		}
-		break;
-	case 'V':
-		switch(emu->cur_ev->header.class)
-		{
-		case 'S': pre_sched(emu); break;
-		case 'U': pre_submit(emu); break;
-		case 'M': pre_memory(emu); break;
-		default:
-			break;
-		}
-		break;
-	default:
-		break;
-	}
-
-
 	struct ovni_ethread *th;
+	struct ovni_chan *chan;
 
 	th = emu->cur_thread;
 
-	if(th->show_ss == 0)
-	{
-		emit_thread_state(emu, th, PTT_SUBSYSTEM, ST_NULL);
-		return;
-	}
-
-	/* Only emit a state if needed */
-	if(th->ss_event != EV_NULL)
-	{
-		emit_thread_event(emu, th, PTT_SUBSYSTEM,
-				th->ss_event);
-		emit_cpu_event(emu, th, PTC_SUBSYSTEM,
-				th->ss_event);
-
-		return;
-	}
-
-	emit_thread_state(emu, th, PTT_SUBSYSTEM, ss_last_st(th));
-	emit_cpu_state(emu, th, PTC_SUBSYSTEM, ss_last_st(th));
+	chan_emit(&th->chan[CHAN_NOSV_SS]);
 }
 
 /* --------------------------- post ------------------------------- */
@@ -393,5 +115,4 @@ hook_emit_nosv_ss(struct ovni_emu *emu)
 void
 hook_post_nosv_ss(struct ovni_emu *emu)
 {
-	emu->cur_thread->ss_event = EV_NULL;
 }

emu_ovni.c

@@ -1,12 +1,35 @@
 #include "ovni.h"
 #include "emu.h"
 #include "prv.h"
+#include "chan.h"
 
 #include <assert.h>
 
 /* The emulator ovni module provides the execution model by tracking the thread
  * state and which threads run in each CPU */
 
+/* --------------------------- pre ------------------------------- */
+
+static void
+thread_set_channel_enabled(struct ovni_ethread *th, int enabled)
+{
+	int i;
+	for(i=0; i<CHAN_MAX; i++)
+		chan_enable(&th->chan[i], enabled);
+}
+
+static void
+thread_set_state(struct ovni_ethread *th, int state)
+{
+	int enabled;
+
+	th->state = state;
+
+	enabled = (state == TH_ST_RUNNING ? 1 : 0);
+
+	thread_set_channel_enabled(th, enabled);
+}
+
 void
 update_cpu(struct ovni_emu *emu, struct ovni_cpu *cpu)
 {
@@ -88,7 +111,6 @@ emu_cpu_remove_thread(struct ovni_emu *emu, struct ovni_cpu *cpu, struct ovni_et
 	update_cpu(emu, cpu);
 }
 
-
 static void
 print_threads_state(struct ovni_loom *loom)
 {
@@ -116,61 +138,64 @@ print_threads_state(struct ovni_loom *loom)
 }
 
 static void
-ev_thread_execute(struct ovni_emu *emu)
+pre_thread_execute(struct ovni_emu *emu)
 {
 	struct ovni_cpu *cpu;
+	struct ovni_ethread *th;
 	int cpuid;
 
+	th = emu->cur_thread;
+
 	/* The thread cannot be already running */
-	assert(emu->cur_thread->state != TH_ST_RUNNING);
+	assert(th->state != TH_ST_RUNNING);
 
 	cpuid = emu->cur_ev->payload.i32[0];
-	//dbg("thread %d runs in cpuid %d\n", emu->cur_thread->tid,
+	//dbg("thread %d runs in cpuid %d\n", th->tid,
 	//		cpuid);
 	cpu = emu_get_cpu(emu->cur_loom, cpuid);
 
-	emu->cur_thread->state = TH_ST_RUNNING;
-	emu->cur_thread->cpu = cpu;
+	thread_set_state(th, TH_ST_RUNNING);
+	th->cpu = cpu;
 
-	emu_cpu_add_thread(emu, cpu, emu->cur_thread);
+	emu_cpu_add_thread(emu, cpu, th);
 }
 
 static void
-ev_thread_end(struct ovni_emu *emu)
+pre_thread_end(struct ovni_emu *emu)
 {
 	assert(emu->cur_thread->state == TH_ST_RUNNING);
 	assert(emu->cur_thread->cpu);
 
 	emu_cpu_remove_thread(emu, emu->cur_thread->cpu, emu->cur_thread);
 
-	emu->cur_thread->state = TH_ST_DEAD;
+	thread_set_state(emu->cur_thread, TH_ST_DEAD);
 	emu->cur_thread->cpu = NULL;
 }
 
 static void
-ev_thread_pause(struct ovni_emu *emu)
+pre_thread_pause(struct ovni_emu *emu)
 {
 	assert(emu->cur_thread->state == TH_ST_RUNNING);
 	assert(emu->cur_thread->cpu);
 
 	emu_cpu_remove_thread(emu, emu->cur_thread->cpu, emu->cur_thread);
 
-	emu->cur_thread->state = TH_ST_PAUSED;
+	thread_set_state(emu->cur_thread, TH_ST_PAUSED);
 }
 
 static void
-ev_thread_resume(struct ovni_emu *emu)
+pre_thread_resume(struct ovni_emu *emu)
 {
 	assert(emu->cur_thread->state == TH_ST_PAUSED);
 	assert(emu->cur_thread->cpu);
 
 	emu_cpu_add_thread(emu, emu->cur_thread->cpu, emu->cur_thread);
 
-	emu->cur_thread->state = TH_ST_RUNNING;
+	thread_set_state(emu->cur_thread, TH_ST_RUNNING);
 }
 
 static void
-ev_thread(struct ovni_emu *emu)
+pre_thread(struct ovni_emu *emu)
 {
 	struct ovni_ev *ev;
 	struct ovni_cpu *cpu;
@@ -193,27 +218,19 @@ ev_thread(struct ovni_emu *emu)
 					ev->payload.u32[2]);
 
 			break;
-		case 'x': ev_thread_execute(emu); break;
-		case 'e': ev_thread_end(emu); break;
-		case 'p': ev_thread_pause(emu); break;
-		case 'r': ev_thread_resume(emu); break;
+		case 'x': pre_thread_execute(emu); break;
+		case 'e': pre_thread_end(emu); break;
+		case 'p': pre_thread_pause(emu); break;
+		case 'r': pre_thread_resume(emu); break;
 		default:
 			  err("unknown thread event value %c\n",
 					  ev->header.value);
 			  exit(EXIT_FAILURE);
 	}
-
-	/* All but create events change the thread and CPU state: inject two
-	 * virtual events to notify other modules. The order is important. */
-	if(ev->header.value != 'c')
-	{
-		emu_virtual_ev(emu, "*Hc");
-		emu_virtual_ev(emu, "*Cc");
-	}
 }
 
 static void
-ev_affinity_set(struct ovni_emu *emu)
+pre_affinity_set(struct ovni_emu *emu)
 {
 	int cpuid;
 	struct ovni_cpu *newcpu;
@@ -235,7 +252,7 @@ ev_affinity_set(struct ovni_emu *emu)
 }
 
 static void
-ev_affinity_remote(struct ovni_emu *emu)
+pre_affinity_remote(struct ovni_emu *emu)
 {
 	int cpuid, tid;
 	struct ovni_cpu *newcpu;
@@ -279,13 +296,13 @@ ev_affinity_remote(struct ovni_emu *emu)
 }
 
 static void
-ev_affinity(struct ovni_emu *emu)
+pre_affinity(struct ovni_emu *emu)
 {
 	//emu_emit(emu);
 	switch(emu->cur_ev->header.value)
 	{
-		case 's': ev_affinity_set(emu); break;
-		case 'r': ev_affinity_remote(emu); break;
+		case 's': pre_affinity_set(emu); break;
+		case 'r': pre_affinity_remote(emu); break;
 		default:
 			dbg("unknown affinity event value %c\n",
 					emu->cur_ev->header.value);
@@ -303,8 +320,8 @@ hook_pre_ovni(struct ovni_emu *emu)
 
 	switch(emu->cur_ev->header.class)
 	{
-		case 'H': ev_thread(emu); break;
-		case 'A': ev_affinity(emu); break;
+		case 'H': pre_thread(emu); break;
+		case 'A': pre_affinity(emu); break;
 		case 'B':
 			  //dbg("burst %c\n", emu->cur_ev->header.value);
 			  break;
@@ -317,21 +334,26 @@ hook_pre_ovni(struct ovni_emu *emu)
 	//print_threads_state(emu);
 }
 
+/* --------------------------- emit ------------------------------- */
+
 static void
 emit_thread_state(struct ovni_emu *emu)
 {
-	int row, st, tid;
-	
-	st = emu->cur_thread->state;
-	row = emu->cur_thread->gindex + 1;
-	tid = emu->cur_thread->tid;
+	int i, row;
+	struct ovni_ethread *th;
 
-	prv_ev_thread(emu, row, PTT_THREAD_STATE, st);
+	th = emu->cur_thread;
+	row = th->gindex + 1;
 
-	if(st == TH_ST_RUNNING)
-		prv_ev_thread(emu, row, PTT_THREAD_TID, tid);
+	prv_ev_thread(emu, row, PTT_THREAD_STATE, th->state);
+
+	if(th->state == TH_ST_RUNNING)
+		prv_ev_thread(emu, row, PTT_THREAD_TID, th->tid);
 	else
 		prv_ev_thread(emu, row, PTT_THREAD_TID, 0);
+
+	chan_set(&th->chan[CHAN_OVNI_TID], th->tid);
+
 }
 
 static void
@@ -390,6 +412,8 @@ emit_current_pid(struct ovni_emu *emu)
 void
 hook_emit_ovni(struct ovni_emu *emu)
 {
+	int i;
+
 	if(emu->cur_ev->header.model != 'O')
 		return;
 
@@ -405,8 +429,14 @@ hook_emit_ovni(struct ovni_emu *emu)
 		default:
 			break;
 	}
+
+	/* Emit all enabled channels */
+	for(i=0; i<CHAN_MAX; i++)
+		chan_emit(&emu->cur_thread->chan[i]);
 }
 
+/* --------------------------- post ------------------------------- */
+
 /* Reset thread state */
 static void
 post_virtual_thread(struct ovni_emu *emu)