blob: d4cc9afef419550d851810890629eaad2216c0a8 [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 <lib/async/cpp/irq.h>
#include <zircon/assert.h>
#include <utility>
namespace async {
IrqBase::IrqBase(zx_handle_t object, zx_signals_t trigger, uint32_t options,
async_irq_handler_t* handler)
: irq_{{ASYNC_STATE_INIT}, handler, object} {}
IrqBase::~IrqBase() {
if (dispatcher_) {
// Failure to cancel here may result in a dangling pointer...
zx_status_t status = async_unbind_irq(dispatcher_, &irq_);
ZX_ASSERT_MSG(status == ZX_OK, "status=%d", status);
zx_status_t IrqBase::Begin(async_dispatcher_t* dispatcher) {
if (dispatcher_)
dispatcher_ = dispatcher;
zx_status_t status = async_bind_irq(dispatcher, &irq_);
if (status != ZX_OK) {
dispatcher_ = nullptr;
return status;
zx_status_t IrqBase::Cancel() {
if (!dispatcher_)
async_dispatcher_t* dispatcher = dispatcher_;
dispatcher_ = nullptr;
zx_status_t status = async_unbind_irq(dispatcher, &irq_);
// |dispatcher| is required to be single-threaded, Cancel() is
// only supposed to be called on |dispatcher|'s thread, and
// we verified that the wait was pending before calling
// async_cancel_wait(). Assuming that |dispatcher| never queues
// a wait, |wait_| must have been pending with |dispatcher|.
return status;
Irq::Irq(zx_handle_t object, zx_signals_t trigger, uint32_t options, Handler handler)
: IrqBase(object, trigger, options, &Irq::CallHandler), handler_(std::move(handler)) {}
Irq::~Irq() = default;
void Irq::CallHandler(async_dispatcher_t* dispatcher, async_irq_t* irq, zx_status_t status,
const zx_packet_interrupt_t* signal) {
auto self = Dispatch<Irq>(irq);
self->handler_(dispatcher, self, status, signal);
} // namespace async