| /*! |
| * Copyright (c) 2017 by Contributors |
| * \file pipe.h |
| * \brief Platform independent pipe, used for IPC. |
| */ |
| #ifndef TVM_COMMON_PIPE_H_ |
| #define TVM_COMMON_PIPE_H_ |
| |
| #include <dmlc/logging.h> |
| #include <dmlc/io.h> |
| |
| #ifdef _WIN32 |
| #include <windows.h> |
| #else |
| #include <unistd.h> |
| #include <errno.h> |
| #include <cstring> |
| #include <cstdlib> |
| #endif |
| |
| namespace tvm { |
| namespace common { |
| |
| /*! \brief Platform independent pipe */ |
| class Pipe : public dmlc::Stream { |
| public: |
| #ifdef _WIN32 |
| using PipeHandle = HANDLE; |
| #else |
| using PipeHandle = int; |
| #endif |
| /*! \brief Construct a pipe from system handle. */ |
| explicit Pipe(int64_t handle) |
| : handle_(static_cast<PipeHandle>(handle)) {} |
| /*! \brief destructor */ |
| ~Pipe() { |
| Flush(); |
| } |
| using Stream::Read; |
| using Stream::Write; |
| /*! |
| * \brief reads data from a file descriptor |
| * \param ptr pointer to a memory buffer |
| * \param size block size |
| * \return the size of data read |
| */ |
| size_t Read(void *ptr, size_t size) final { |
| if (size == 0) return 0; |
| #ifdef _WIN32 |
| DWORD nread; |
| CHECK(ReadFile(handle_, static_cast<TCHAR*>(ptr), |
| &nread, nullptr)) |
| << "Read Error: " << GetLastError(); |
| #else |
| ssize_t nread; |
| nread = read(handle_, ptr, size); |
| CHECK_GE(nread, 0) |
| << "Write Error: " << strerror(errno); |
| #endif |
| return static_cast<size_t>(nread); |
| } |
| /*! |
| * \brief write data to a file descriptor |
| * \param ptr pointer to a memory buffer |
| * \param size block size |
| * \return the size of data read |
| */ |
| void Write(const void *ptr, size_t size) final { |
| if (size == 0) return; |
| #ifdef _WIN32 |
| DWORD nwrite; |
| CHECK(WriteFile(handle_, static_cast<const TCHAR*>(ptr), |
| &nwrite, nullptr) && |
| static_cast<size_t>(nwrite) == size) |
| << "Write Error: " << GetLastError(); |
| #else |
| ssize_t nwrite; |
| nwrite = write(handle_, ptr, size); |
| CHECK_EQ(static_cast<size_t>(nwrite), size) |
| << "Write Error: " << strerror(errno); |
| #endif |
| } |
| /*! |
| * \brief Flush the pipe; |
| */ |
| void Flush() { |
| #ifdef _WIN32 |
| FlushFileBuffers(handle_); |
| #endif |
| } |
| /*! \brief close the pipe */ |
| void Close() { |
| #ifdef _WIN32 |
| CloseHandle(handle_); |
| #else |
| close(handle_); |
| #endif |
| } |
| |
| private: |
| PipeHandle handle_; |
| }; |
| } // namespace common |
| } // namespace tvm |
| |
| #endif // TVM_COMMON_PIPE_H_ |