+ struct thread_info *next;
+ ptid_t ptid; /* "Actual process id";
+ In fact, this may be overloaded with
+ kernel thread id, etc. */
+ int num; /* Convenient handle (GDB thread id) */
+
+ /* The name of the thread, as specified by the user. This is NULL
+ if the thread does not have a user-given name. */
+ char *name;
+
+ /* Non-zero means the thread is executing. Note: this is different
+ from saying that there is an active target and we are stopped at
+ a breakpoint, for instance. This is a real indicator whether the
+ thread is off and running. */
+ int executing;
+
+ /* Frontend view of the thread state. Note that the RUNNING/STOPPED
+ states are different from EXECUTING. When the thread is stopped
+ internally while handling an internal event, like a software
+ single-step breakpoint, EXECUTING will be false, but running will
+ still be true. As a possible future extension, this could turn
+ into enum { stopped, exited, stepping, finishing, until(ling),
+ running ... } */
+ int state;
+
+ /* If this is > 0, then it means there's code out there that relies
+ on this thread being listed. Don't delete it from the lists even
+ if we detect it exiting. */
+ int refcount;
+
+ /* State of GDB control of inferior thread execution.
+ See `struct thread_control_state'. */
+ struct thread_control_state control;
+
+ /* State of inferior thread to restore after GDB is done with an inferior
+ call. See `struct thread_suspend_state'. */
+ struct thread_suspend_state suspend;
+
+ int current_line;
+ struct symtab *current_symtab;
+
+ /* Internal stepping state. */
+
+ /* Record the pc of the thread the last time it stopped. This is
+ maintained by proceed and keep_going, and used in
+ adjust_pc_after_break to distinguish a hardware single-step
+ SIGTRAP from a breakpoint SIGTRAP. */
+ CORE_ADDR prev_pc;
+
+ /* Should we step over breakpoint next time keep_going is called? */
+ int stepping_over_breakpoint;
+
+ /* Set to TRUE if we should finish single-stepping over a breakpoint
+ after hitting the current step-resume breakpoint. The context here
+ is that GDB is to do `next' or `step' while signal arrives.
+ When stepping over a breakpoint and signal arrives, GDB will attempt
+ to skip signal handler, so it inserts a step_resume_breakpoint at the
+ signal return address, and resume inferior.
+ step_after_step_resume_breakpoint is set to TRUE at this moment in
+ order to keep GDB in mind that there is still a breakpoint to step over
+ when GDB gets back SIGTRAP from step_resume_breakpoint. */
+ int step_after_step_resume_breakpoint;
+
+ /* Per-thread command support. */
+
+ /* Pointer to what is left to do for an execution command after the
+ target stops. Used only in asynchronous mode, by targets that
+ support async execution. Several execution commands use it. */
+ struct continuation *continuations;
+
+ /* Similar to the above, but used when a single execution command
+ requires several resume/stop iterations. Used by the step
+ command. */
+ struct continuation *intermediate_continuations;
+
+ /* If stepping, nonzero means step count is > 1 so don't print frame
+ next time inferior stops if it stops due to stepping. */
+ int step_multi;
+
+ /* This is used to remember when a fork or vfork event was caught by
+ a catchpoint, and thus the event is to be followed at the next
+ resume of the thread, and not immediately. */
+ struct target_waitstatus pending_follow;
+
+ /* True if this thread has been explicitly requested to stop. */
+ int stop_requested;
+
+ /* The initiating frame of a nexting operation, used for deciding
+ which exceptions to intercept. If it is null_frame_id no
+ bp_longjmp or bp_exception but longjmp has been caught just for
+ bp_longjmp_call_dummy. */
+ struct frame_id initiating_frame;
+
+ /* Private data used by the target vector implementation. */
+ struct private_thread_info *private;
+
+ /* Function that is called to free PRIVATE. If this is NULL, then
+ xfree will be called on PRIVATE. */
+ void (*private_dtor) (struct private_thread_info *);
+
+ /* Branch trace information for this thread. */
+ struct btrace_thread_info btrace;
+};
+
+/* Create an empty thread list, or empty the existing one. */
+extern void init_thread_list (void);
+
+/* Add a thread to the thread list, print a message
+ that a new thread is found, and return the pointer to
+ the new thread. Caller my use this pointer to
+ initialize the private thread data. */
+extern struct thread_info *add_thread (ptid_t ptid);
+
+/* Same as add_thread, but does not print a message
+ about new thread. */
+extern struct thread_info *add_thread_silent (ptid_t ptid);
+
+/* Same as add_thread, and sets the private info. */
+extern struct thread_info *add_thread_with_info (ptid_t ptid,
+ struct private_thread_info *);
+
+/* Delete an existing thread list entry. */
+extern void delete_thread (ptid_t);
+
+/* Delete an existing thread list entry, and be quiet about it. Used
+ after the process this thread having belonged to having already
+ exited, for example. */
+extern void delete_thread_silent (ptid_t);
+
+/* Delete a step_resume_breakpoint from the thread database. */
+extern void delete_step_resume_breakpoint (struct thread_info *);
+
+/* Delete an exception_resume_breakpoint from the thread database. */
+extern void delete_exception_resume_breakpoint (struct thread_info *);
+
+/* Translate the integer thread id (GDB's homegrown id, not the system's)
+ into a "pid" (which may be overloaded with extra thread information). */
+extern ptid_t thread_id_to_pid (int);
+
+/* Translate a 'pid' (which may be overloaded with extra thread information)
+ into the integer thread id (GDB's homegrown id, not the system's). */
+extern int pid_to_thread_id (ptid_t ptid);
+
+/* Boolean test for an already-known pid (which may be overloaded with
+ extra thread information). */
+extern int in_thread_list (ptid_t ptid);
+
+/* Boolean test for an already-known thread id (GDB's homegrown id,
+ not the system's). */
+extern int valid_thread_id (int thread);
+
+/* Search function to lookup a thread by 'pid'. */
+extern struct thread_info *find_thread_ptid (ptid_t ptid);
+
+/* Find thread by GDB user-visible thread number. */
+struct thread_info *find_thread_id (int num);
+
+/* Finds the first thread of the inferior given by PID. If PID is -1,
+ returns the first thread in the list. */
+struct thread_info *first_thread_of_process (int pid);
+
+/* Returns any thread of process PID. */
+extern struct thread_info *any_thread_of_process (int pid);
+
+/* Returns any non-exited thread of process PID, giving preference for
+ not executing threads. */
+extern struct thread_info *any_live_thread_of_process (int pid);
+
+/* Change the ptid of thread OLD_PTID to NEW_PTID. */
+void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);
+
+/* Iterator function to call a user-provided callback function
+ once for each known thread. */
+typedef int (*thread_callback_func) (struct thread_info *, void *);
+extern struct thread_info *iterate_over_threads (thread_callback_func, void *);
+
+/* Traverse all threads. */
+
+#define ALL_THREADS(T) \
+ for (T = thread_list; T; T = T->next)
+
+extern int thread_count (void);
+
+/* Switch from one thread to another. */
+extern void switch_to_thread (ptid_t ptid);
+
+/* Marks thread PTID is running, or stopped.
+ If ptid_get_pid (PTID) is -1, marks all threads. */
+extern void set_running (ptid_t ptid, int running);
+
+/* Marks or clears thread(s) PTID as having been requested to stop.
+ If PTID is MINUS_ONE_PTID, applies to all threads. If
+ ptid_is_pid(PTID) is true, applies to all threads of the process
+ pointed at by PTID. If STOP, then the THREAD_STOP_REQUESTED
+ observer is called with PTID as argument. */
+extern void set_stop_requested (ptid_t ptid, int stop);
+
+/* NOTE: Since the thread state is not a boolean, most times, you do
+ not want to check it with negation. If you really want to check if
+ the thread is stopped,
+
+ use (good):
+
+ if (is_stopped (ptid))
+
+ instead of (bad):
+
+ if (!is_running (ptid))
+
+ The latter also returns true on exited threads, most likelly not
+ what you want. */
+
+/* Reports if in the frontend's perpective, thread PTID is running. */
+extern int is_running (ptid_t ptid);
+
+/* Is this thread listed, but known to have exited? We keep it listed
+ (but not visible) until it's safe to delete. */
+extern int is_exited (ptid_t ptid);
+
+/* In the frontend's perpective, is this thread stopped? */
+extern int is_stopped (ptid_t ptid);
+
+/* In the frontend's perpective is there any thread running? */
+extern int any_running (void);
+
+/* Marks thread PTID as executing, or not. If ptid_get_pid (PTID) is -1,
+ marks all threads.
+
+ Note that this is different from the running state. See the
+ description of state and executing fields of struct
+ thread_info. */
+extern void set_executing (ptid_t ptid, int executing);
+
+/* Reports if thread PTID is executing. */
+extern int is_executing (ptid_t ptid);
+
+/* Merge the executing property of thread PTID over to its thread
+ state property (frontend running/stopped view).
+
+ "not executing" -> "stopped"
+ "executing" -> "running"
+ "exited" -> "exited"
+
+ If ptid_get_pid (PTID) is -1, go over all threads.
+
+ Notifications are only emitted if the thread state did change. */
+extern void finish_thread_state (ptid_t ptid);
+
+/* Same as FINISH_THREAD_STATE, but with an interface suitable to be
+ registered as a cleanup. PTID_P points to the ptid_t that is
+ passed to FINISH_THREAD_STATE. */
+extern void finish_thread_state_cleanup (void *ptid_p);
+
+/* Commands with a prefix of `thread'. */
+extern struct cmd_list_element *thread_cmd_list;
+
+/* Print notices on thread events (attach, detach, etc.), set with
+ `set print thread-events'. */
+extern int print_thread_events;
+
+extern void print_thread_info (struct ui_out *uiout, char *threads,
+ int pid);
+
+extern struct cleanup *make_cleanup_restore_current_thread (void);
+
+/* Returns a pointer into the thread_info corresponding to
+ INFERIOR_PTID. INFERIOR_PTID *must* be in the thread list. */
+extern struct thread_info* inferior_thread (void);