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// Common DSO loading functionality: exposes callables that dlopen DSOs
// in either the runfiles directories
#ifndef TENSORFLOW_STREAM_EXECUTOR_DSO_LOADER_H_
#define TENSORFLOW_STREAM_EXECUTOR_DSO_LOADER_H_
#include "tensorflow/stream_executor/platform/port.h"
#include <vector>
#include "tensorflow/stream_executor/lib/status.h"
#include "tensorflow/stream_executor/lib/statusor.h"
#include "tensorflow/stream_executor/lib/stringpiece.h"
#include "tensorflow/stream_executor/platform.h"
#include "tensorflow/stream_executor/platform/mutex.h"
#include "tensorflow/stream_executor/platform/port.h"
namespace perftools {
namespace gputools {
namespace internal {
// Permits StreamExecutor code to dynamically load a pre-determined set of
// relevant DSOs via dlopen.
//
// Thread-safe.
class DsoLoader {
public:
// The following methods either load the DSO of interest and return a dlopen
// handle or error status in the canonical namespace.
static port::Status GetCublasDsoHandle(void** dso_handle);
static port::Status GetCudnnDsoHandle(void** dso_handle);
static port::Status GetCufftDsoHandle(void** dso_handle);
static port::Status GetCurandDsoHandle(void** dso_handle);
static port::Status GetLibcudaDsoHandle(void** dso_handle);
static port::Status GetLibcuptiDsoHandle(void** dso_handle);
// Registers a new binary-relative path to use as a dlopen search path.
static void RegisterRpath(port::StringPiece path);
private:
// Registered rpaths (singleton vector) and a mutex that guards it.
static std::vector<string>* GetRpaths();
static mutex rpath_mutex_;
// Descriptive boolean wrapper to indicate whether symbols are made available
// to resolve in later-loaded libraries.
enum class LoadKind { kLocal, kGlobal };
// Loads a DSO from the given "path" (which can technically be any dlopen-able
// name). If the load kind is global, the symbols in the loaded DSO are
// visible to subsequent DSO loading operations.
static port::Status GetDsoHandle(port::StringPiece path, void** dso_handle,
LoadKind load_kind = LoadKind::kLocal);
// Returns the binary directory (or binary path) associated with the currently
// executing program. If strip_executable_name is true, the executable file is
// stripped off of the path.
static string GetBinaryDirectory(bool strip_executable_name);
// Returns the location of the runfiles directory.
// * Manual invocation gets the runfiles as a relative path to the current
// executable.
static string GetRunfilesDirectory();
// Invokes realpath on the original path; updates candidate and returns true
// if it succeeds (i.e. a file exists at the path); otherwise, returns false.
static bool TrySymbolicDereference(string* candidate);
// Attempts to find a path to the DSO of interest, otherwise returns the
// bare library name:
// Arguments:
// library_name: the filename in tree; e.g. libOpenCL.so.1.0.0
// runfiles_relpath: where to look for the library relative to the runfiles
// root; e.g. third_party/gpus/cuda/lib64
static string FindDsoPath(port::StringPiece library_name,
port::StringPiece runfiles_relpath);
SE_DISALLOW_COPY_AND_ASSIGN(DsoLoader);
};
// Wrapper around the DsoLoader that prevents us from dlopen'ing any of the DSOs
// more than once.
class CachedDsoLoader {
public:
// Cached versions of the corresponding DsoLoader methods above.
static port::StatusOr<void*> GetCublasDsoHandle();
static port::StatusOr<void*> GetCudnnDsoHandle();
static port::StatusOr<void*> GetCufftDsoHandle();
static port::StatusOr<void*> GetCurandDsoHandle();
static port::StatusOr<void*> GetLibcudaDsoHandle();
static port::StatusOr<void*> GetLibcuptiDsoHandle();
private:
// Fetches a DSO handle via "load_dso" and returns the StatusOr form of the
// result.
static port::StatusOr<void*> FetchHandleResult(
std::function<port::Status(void**)> load_dso);
SE_DISALLOW_COPY_AND_ASSIGN(CachedDsoLoader);
};
} // namespace internal
} // namespace gputools
} // namespace perftools
#endif // TENSORFLOW_STREAM_EXECUTOR_DSO_LOADER_H_
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