| /* Multi-thread control defs for remote server for GDB. |
| Copyright (C) 1993-2021 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef GDBSERVER_GDBTHREAD_H |
| #define GDBSERVER_GDBTHREAD_H |
| |
| #include "gdbsupport/common-gdbthread.h" |
| #include "inferiors.h" |
| |
| #include <list> |
| |
| struct btrace_target_info; |
| struct regcache; |
| |
| struct thread_info |
| { |
| /* The id of this thread. */ |
| ptid_t id; |
| |
| void *target_data; |
| struct regcache *regcache_data; |
| |
| /* The last resume GDB requested on this thread. */ |
| enum resume_kind last_resume_kind; |
| |
| /* The last wait status reported for this thread. */ |
| struct target_waitstatus last_status; |
| |
| /* True if LAST_STATUS hasn't been reported to GDB yet. */ |
| int status_pending_p; |
| |
| /* Given `while-stepping', a thread may be collecting data for more |
| than one tracepoint simultaneously. E.g.: |
| |
| ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs |
| ff0002 INSN2 |
| ff0003 INSN3 <-- TP2, collect $regs |
| ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs |
| ff0005 INSN5 |
| |
| Notice that when instruction INSN5 is reached, the while-stepping |
| actions of both TP1 and TP3 are still being collected, and that TP2 |
| had been collected meanwhile. The whole range of ff0001-ff0005 |
| should be single-stepped, due to at least TP1's while-stepping |
| action covering the whole range. |
| |
| On the other hand, the same tracepoint with a while-stepping action |
| may be hit by more than one thread simultaneously, hence we can't |
| keep the current step count in the tracepoint itself. |
| |
| This is the head of the list of the states of `while-stepping' |
| tracepoint actions this thread is now collecting; NULL if empty. |
| Each item in the list holds the current step of the while-stepping |
| action. */ |
| struct wstep_state *while_stepping; |
| |
| /* Branch trace target information for this thread. */ |
| struct btrace_target_info *btrace; |
| }; |
| |
| extern std::list<thread_info *> all_threads; |
| |
| void remove_thread (struct thread_info *thread); |
| struct thread_info *add_thread (ptid_t ptid, void *target_data); |
| |
| /* Return a pointer to the first thread, or NULL if there isn't one. */ |
| |
| struct thread_info *get_first_thread (void); |
| |
| struct thread_info *find_thread_ptid (ptid_t ptid); |
| |
| /* Find any thread of the PID process. Returns NULL if none is |
| found. */ |
| struct thread_info *find_any_thread_of_pid (int pid); |
| |
| /* Find the first thread for which FUNC returns true. Return NULL if no thread |
| satisfying FUNC is found. */ |
| |
| template <typename Func> |
| static thread_info * |
| find_thread (Func func) |
| { |
| std::list<thread_info *>::iterator next, cur = all_threads.begin (); |
| |
| while (cur != all_threads.end ()) |
| { |
| next = cur; |
| next++; |
| |
| if (func (*cur)) |
| return *cur; |
| |
| cur = next; |
| } |
| |
| return NULL; |
| } |
| |
| /* Like the above, but only consider threads with pid PID. */ |
| |
| template <typename Func> |
| static thread_info * |
| find_thread (int pid, Func func) |
| { |
| return find_thread ([&] (thread_info *thread) |
| { |
| return thread->id.pid () == pid && func (thread); |
| }); |
| } |
| |
| /* Find the first thread that matches FILTER for which FUNC returns true. |
| Return NULL if no thread satisfying these conditions is found. */ |
| |
| template <typename Func> |
| static thread_info * |
| find_thread (ptid_t filter, Func func) |
| { |
| return find_thread ([&] (thread_info *thread) { |
| return thread->id.matches (filter) && func (thread); |
| }); |
| } |
| |
| /* Invoke FUNC for each thread. */ |
| |
| template <typename Func> |
| static void |
| for_each_thread (Func func) |
| { |
| std::list<thread_info *>::iterator next, cur = all_threads.begin (); |
| |
| while (cur != all_threads.end ()) |
| { |
| next = cur; |
| next++; |
| func (*cur); |
| cur = next; |
| } |
| } |
| |
| /* Like the above, but only consider threads with pid PID. */ |
| |
| template <typename Func> |
| static void |
| for_each_thread (int pid, Func func) |
| { |
| for_each_thread ([&] (thread_info *thread) |
| { |
| if (pid == thread->id.pid ()) |
| func (thread); |
| }); |
| } |
| |
| /* Find the a random thread for which FUNC (THREAD) returns true. If |
| no entry is found then return NULL. */ |
| |
| template <typename Func> |
| static thread_info * |
| find_thread_in_random (Func func) |
| { |
| int count = 0; |
| int random_selector; |
| |
| /* First count how many interesting entries we have. */ |
| for_each_thread ([&] (thread_info *thread) { |
| if (func (thread)) |
| count++; |
| }); |
| |
| if (count == 0) |
| return NULL; |
| |
| /* Now randomly pick an entry out of those. */ |
| random_selector = (int) |
| ((count * (double) rand ()) / (RAND_MAX + 1.0)); |
| |
| thread_info *thread = find_thread ([&] (thread_info *thr_arg) { |
| return func (thr_arg) && (random_selector-- == 0); |
| }); |
| |
| gdb_assert (thread != NULL); |
| |
| return thread; |
| } |
| |
| /* Get current thread ID (Linux task ID). */ |
| #define current_ptid (current_thread->id) |
| |
| /* Get the ptid of THREAD. */ |
| |
| static inline ptid_t |
| ptid_of (const thread_info *thread) |
| { |
| return thread->id; |
| } |
| |
| /* Get the pid of THREAD. */ |
| |
| static inline int |
| pid_of (const thread_info *thread) |
| { |
| return thread->id.pid (); |
| } |
| |
| /* Get the lwp of THREAD. */ |
| |
| static inline long |
| lwpid_of (const thread_info *thread) |
| { |
| return thread->id.lwp (); |
| } |
| |
| #endif /* GDBSERVER_GDBTHREAD_H */ |