src/util/futex_fuchsia.cpp

// 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 "futex.h"
#include "magma_util/dlog.h"
#include "magma_util/macros.h"
#include "platform_futex.h"
#include <errno.h>

int futex_wake(uint32_t* addr, int count)
{
   if (!magma::PlatformFutex::Wake(addr, count))
      return DRET_MSG(-1, "Wake failed");
   return 0;
}

int futex_wait(uint32_t* addr, int32_t value, const struct timespec* timeout)
{
   // Timeouts not implemented.
   assert(timeout == nullptr);
   magma::PlatformFutex::WaitResult result;
   if (!magma::PlatformFutex::WaitForever(addr, value, &result))
      return DRET_MSG(-EINVAL, "PlatformFutex::WaitForever failed");
   if (result == magma::PlatformFutex::WaitResult::RETRY)
      return -EAGAIN;
   assert(result == magma::PlatformFutex::WaitResult::AWOKE);
   return 0;
}