Class group

boost::process::group

Synopsis

// In header: <boost/process/group.hpp>


class group {
public:
  // types
  typedef unspecified            group_handle;   
  typedef group_handle::handle_t native_handle_t;  // Native representation of the handle. 

  // construct/copy/destruct
  explicit group(group_handle &&);
  explicit group(native_handle_t &);
  group(const group &) = delete;
  group(group &&);
  group() = default;
  group & operator=(const group &) = delete;
  group & operator=(group &&);
  ~group();

  // public member functions
  void detach();
  void join();
  bool joinable();
  native_handle_t native_handle() const;
  void wait();
  void wait(std::error_code &) noexcept;
  template<typename Rep, typename Period> 
    bool wait_for(const std::chrono::duration< Rep, Period > &);
  template<typename Rep, typename Period> 
    bool wait_for(const std::chrono::duration< Rep, Period > &, 
                  std::error_code &) noexcept;
  template<typename Clock, typename Duration> 
    bool wait_until(const std::chrono::time_point< Clock, Duration > &);
  template<typename Clock, typename Duration> 
    bool wait_until(const std::chrono::time_point< Clock, Duration > &, 
                    std::error_code &) noexcept;
  bool valid() const;
  explicit operator bool() const;
  void terminate();
  void terminate(std::error_code &) noexcept;
  void add(const child &);
  void add(const child &, std::error_code &) noexcept;
  bool has(const child &);
  bool has(const child &, std::error_code &) noexcept;
};

Description

Represents a process group.

Groups are movable but non-copyable. The destructor automatically closes handles to the group process.

The group will have the same interface as std::thread.

	Note
	If the destructor is called without a previous detach or wait, the group will be terminated.

Note

If a default-constructed group is used before being used in a process launch, the behaviour is undefined.

Waiting for groups is currently broken on windows and will most likely result in a dead-lock.

`group` public construct/copy/destruct

```
explicit group(group_handle && ch);
```

explicit group(native_handle_t & handle);

Construct the group from a native_handle.

```
group(const group &) = delete;
```
```
group(group && lhs);
```
Move constructor.
```
group() = default;
```
Default constructor.

group & operator=(const group &) = delete;

```
group & operator=(group && lhs);
```
Move assign.
```
~group();
```
Destructor

Note

If the destructor is called without a previous detach or wait, the group will be terminated.

`group` public member functions

```
void detach();
```
Detach the group.
```
void join();
```
Join the child. This just calls wait, but that way the naming is similar to std::thread
```
bool joinable();
```
Check if the child is joinable.
```
native_handle_t native_handle() const;
```
Obtain the native handle of the group.
```
void wait();
```
Wait for the process group to exit.
```
void wait(std::error_code & ec) noexcept;
```
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename Rep, typename Period> 
  bool wait_for(const std::chrono::duration< Rep, Period > & rel_time);

Wait for the process group to exit for period of time.

Returns:

True if all child processes exited while waiting.

template<typename Rep, typename Period> 
  bool wait_for(const std::chrono::duration< Rep, Period > & rel_time, 
                std::error_code & ec) noexcept;

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename Clock, typename Duration> 
  bool wait_until(const std::chrono::time_point< Clock, Duration > & timeout_time);

Wait for the process group to exit until a point in time.