lib/magma/src/sys_driver/magma_system_semaphore.cc

// Copyright 2017 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 "magma_system_semaphore.h"
#include "magma_util/macros.h"

MagmaSystemSemaphore::MagmaSystemSemaphore(
    std::unique_ptr<magma::PlatformSemaphore> platform_semaphore,
    msd_semaphore_unique_ptr_t msd_semaphore_t)
    : platform_semaphore_(std::move(platform_semaphore)), msd_semaphore_(std::move(msd_semaphore_t))
{
}

std::unique_ptr<MagmaSystemSemaphore>
MagmaSystemSemaphore::Create(std::unique_ptr<magma::PlatformSemaphore> platform_semaphore)
{
    if (!platform_semaphore)
        return DRETP(nullptr, "null platform semaphore");

    uint32_t handle;
    if (!platform_semaphore->duplicate_handle(&handle))
        return DRETP(nullptr, "failed to get duplicate handle");

    msd_semaphore_t* msd_semaphore;
    magma_status_t status = msd_semaphore_import(handle, &msd_semaphore);
    if (status != MAGMA_STATUS_OK)
        return DRETP(nullptr, "msd_semaphore_import failed: %d", status);

    return std::unique_ptr<MagmaSystemSemaphore>(new MagmaSystemSemaphore(
        std::move(platform_semaphore), MsdSemaphoreUniquePtr(msd_semaphore)));
}