* Removed unused team::pending_signals.

* Added team::flags. Currently only used for setting a flag when a team
  has exec()ed.
* Some improvements of _user_setpgid():
  - It failed incorrectly when the target process was a process group
    leader. According to the standard it shall fail when the process is
    a session leader. Moving a process group leader to another process
    group is fine, even if that leaves the group leaderless.
  - Fixed race conditions. We need to recheck the error conditions when
    we hold the team spinlock. Otherwise the situation could change
    while we allocated the new process group. This was one of the
    reasons for bug #1799 -- after the shell fork()'s both parent and
    child invoke setpgid() for the child.
  - Fixed behavior for pid == pgid. It doesn't necessarily mean that a
    new group has to be created.
  - Fixed update of target process group orphaned state.
  - Squashed TODO: setpgid() on a child is supposed to fail after the
    child has exec()ed.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24041 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/thread_types.h

@@ -41,6 +41,8 @@ enum team_state {
 	TEAM_STATE_DEATH	// being killed
 };
 
+#define	TEAM_FLAG_EXEC_DONE	0x01
+
 typedef enum job_control_state {
 	JOB_CONTROL_STATE_NONE,
 	JOB_CONTROL_STATE_STOPPED,
@@ -155,7 +157,7 @@ struct team {
 	char			args[64];		// contents for the team_info::args field
 	int				num_threads;	// number of threads in this team
 	int				state;			// current team state, see above
-	int				pending_signals;
+	int32			flags;
 	void			*io_context;
 	sem_id			death_sem;		// semaphore to wait on for dying threads
 	struct list		dead_threads;