blob: 75476d5432ec4027e460f57c6d259312999594e8 [file] [log] [blame]
// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "tracer.h"
#include <lib/trace/event.h>
#include <stdarg.h>
#include "utils.h"
zx_status_t Tracer::Start() {
zx_status_t res;
loop_ = std::make_unique<async::Loop>(&kAsyncLoopConfigNoAttachToCurrentThread);
res = loop_->StartThread();
if (res != ZX_OK) {
fprintf(stderr, "Failed to start trace thread (res = %d)\n", res);
return res;
trace_provider_ = std::make_unique<trace::TraceProviderWithFdio>(loop_->dispatcher());
// Wait for the trace subsystem to start up and be ready to go.
printf("Waiting up to 5 seconds for tracing to start.\n");
res = WaitFor([]() { return trace_state() == TRACE_STARTED; }, zx::sec(5));
if (res == ZX_ERR_TIMED_OUT) {
fprintf(stderr, "Timeout waiting for tracing to start\n");
return res;
void Tracer::Trace(trace_scope_t scope, const char* fmt, ...) {
char buffer[256];
va_list ap;
va_start(ap, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, ap);
TRACE_INSTANT("app", "mutex_pi_exerciser", scope, "msg", TA_STRING(buffer));