BLI_subprocess.hh

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/* SPDX-FileCopyrightText: 2024 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#if defined(_WIN32) || defined(__linux__)
#  define BLI_SUBPROCESS_SUPPORT 1
#else
#  define BLI_SUBPROCESS_SUPPORT 0
#endif
 
#if BLI_SUBPROCESS_SUPPORT
 
#  include "BLI_span.hh"
#  include "BLI_string_ref.hh"
#  include "BLI_sys_types.h"
#  include "BLI_utility_mixins.hh"
#  include <string>
 
#  ifdef _WIN32
typedef void *HANDLE;
#  else
#    include <semaphore.h>
#  endif
 
namespace blender {
 
class BlenderSubprocess : NonCopyable {
 private:
#  ifdef _WIN32
  HANDLE handle_ = nullptr;
#  else
  pid_t pid_ = 0;
#  endif
 public:
  ~BlenderSubprocess();
 
  bool create(Span<StringRefNull> args);
  bool is_running();
};
 
class SharedMemory : NonCopyable {
 private:
  std::string name_;
#  ifdef _WIN32
  HANDLE handle_;
#  else
  int handle_;
#  endif
  void *data_;
  size_t data_size_;
  bool is_owner_;
 
 public:
  SharedMemory(std::string name, size_t size, bool is_owner);
  ~SharedMemory();
 
  void *get_data()
  {
    return data_;
  }
 
  size_t get_size()
  {
    return data_size_;
  }
};
 
class SharedSemaphore : NonCopyable {
 private:
  std::string name_;
#  if defined(_WIN32)
  HANDLE handle_;
#  else
  sem_t *handle_;
#  endif
  bool is_owner_;
 
 public:
  SharedSemaphore(std::string name, bool is_owner);
  ~SharedSemaphore();
 
  /* Increment the semaphore value. */
  void increment();
  /* Decrement the semaphore value (Blocks until the semaphore value is greater than 0). */
  void decrement();
  bool try_decrement(int wait_ms = 0);
};
 
}  // namespace blender
 
#endif