loader/fuchsia/icd_fuchsia.cc

/*
 * Copyright (c) 2021 The Khronos Group Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * OpenCL is a trademark of Apple Inc. used under license by Khronos.
 */

#include "dlopen_fuchsia.h"
#include "loader_service.h"

#include <dlfcn.h>
#include <lib/syslog/global.h>
#include <pthread.h>

extern "C" {
  #include "icd.h"
}

static pthread_once_t initialized = PTHREAD_ONCE_INIT;

/*
 *
 * Vendor enumeration functions
 *
 */

// go through the list of vendors in the two configuration files
void khrIcdOsVendorsEnumerate(void)
{
    auto &loader_svc = opencl_loader::get_opencl_loader_service();
    if (!loader_svc.is_valid()) {
        FX_LOGF(ERROR, opencl_loader::kTag, "no connection to loader svc");
        return;
    }

    // TODO(fxbug.dev/91413): Get the library name from the loader_service.
    khrIcdVendorAdd("libopencl_fake.so");
}

// go through the list of vendors only once
void khrIcdOsVendorsEnumerateOnce(void)
{
    pthread_once(&initialized, khrIcdOsVendorsEnumerate);
}

/*
 *
 * Dynamic library loading functions
 *
 */

// dynamically load a library.  returns NULL on failure
void *khrIcdOsLibraryLoad(const char *libraryName)
{
    return dlopen_fuchsia(libraryName, RTLD_NOW, true);
}

// get a function pointer from a loaded library.  returns NULL on failure.
void *khrIcdOsLibraryGetFunctionAddress(void *library, const char *functionName)
{
    return dlsym(library, functionName);
}

// unload a library
void khrIcdOsLibraryUnload(void *library)
{
    dlclose(library);
}