* [PATCH] Add overloads of for_each_thread/find_thread that filter on pid
@ 2017-10-14 13:22 Simon Marchi
2017-10-21 16:21 ` Simon Marchi
0 siblings, 1 reply; 2+ messages in thread
From: Simon Marchi @ 2017-10-14 13:22 UTC (permalink / raw)
To: gdb-patches; +Cc: Simon Marchi
It happens often that we want to iterate or find threads restricted to a
given pid. I think it's worth having an overload to help with this.
Right now there is a single user of each of the find_thread and
for_each_thread overload, but as we replace the usages of find_inferior
with for_each_thread/find_thread, more usages will pop up.
Here's an example of a future change that could use it:
https://github.com/simark/binutils-gdb/commit/9ae5b90d8e6a6836f26ef6685e1f343112e1182a
gdb/gdbserver/ChangeLog:
* gdbthread.h (find_thread, for_each_thread): New functions.
* inferiors.c (thread_of_pid): Remove.
(find_any_thread_of_pid): Use find_thread.
* linux-low.c (num_lwps): Use for_each_thread.
---
gdb/gdbserver/gdbthread.h | 25 +++++++++++++++++++++++++
gdb/gdbserver/inferiors.c | 15 +++------------
gdb/gdbserver/linux-low.c | 6 +++---
3 files changed, 31 insertions(+), 15 deletions(-)
diff --git a/gdb/gdbserver/gdbthread.h b/gdb/gdbserver/gdbthread.h
index 8ace051..b82d5b0 100644
--- a/gdb/gdbserver/gdbthread.h
+++ b/gdb/gdbserver/gdbthread.h
@@ -111,6 +111,18 @@ find_thread (Func func)
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);
+ });
+}
+
/* Invoke FUNC for each thread. */
template <typename Func>
@@ -128,6 +140,19 @@ for_each_thread (Func func)
}
}
+/* 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. */
diff --git a/gdb/gdbserver/inferiors.c b/gdb/gdbserver/inferiors.c
index 564121f..a0ece4d 100644
--- a/gdb/gdbserver/inferiors.c
+++ b/gdb/gdbserver/inferiors.c
@@ -132,23 +132,14 @@ find_thread_process (const struct process_info *const process)
return find_any_thread_of_pid (process->pid);
}
-/* Helper for find_any_thread_of_pid. Returns true if a thread
- matches a PID. */
-
-static int
-thread_of_pid (thread_info *entry, void *pid_p)
-{
- int pid = *(int *) pid_p;
-
- return (ptid_get_pid (entry->id) == pid);
-}
-
/* See gdbthread.h. */
struct thread_info *
find_any_thread_of_pid (int pid)
{
- return find_inferior (&all_threads, thread_of_pid, &pid);
+ return find_thread (pid, [] (thread_info *thread) {
+ return true;
+ });
}
static void
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 0b93fa2..b367e53 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -1869,10 +1869,10 @@ num_lwps (int pid)
{
int count = 0;
- for_each_thread ([&] (thread_info *thread) {
- if (thread->id.pid () == pid)
+ for_each_thread (pid, [&] (thread_info *thread)
+ {
count++;
- });
+ });
return count;
}
--
2.7.4
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] Add overloads of for_each_thread/find_thread that filter on pid
2017-10-14 13:22 [PATCH] Add overloads of for_each_thread/find_thread that filter on pid Simon Marchi
@ 2017-10-21 16:21 ` Simon Marchi
0 siblings, 0 replies; 2+ messages in thread
From: Simon Marchi @ 2017-10-21 16:21 UTC (permalink / raw)
To: Simon Marchi, gdb-patches
On 2017-10-14 09:21 AM, Simon Marchi wrote:
> It happens often that we want to iterate or find threads restricted to a
> given pid. I think it's worth having an overload to help with this.
> Right now there is a single user of each of the find_thread and
> for_each_thread overload, but as we replace the usages of find_inferior
> with for_each_thread/find_thread, more usages will pop up.
>
> Here's an example of a future change that could use it:
> https://github.com/simark/binutils-gdb/commit/9ae5b90d8e6a6836f26ef6685e1f343112e1182a
>
> gdb/gdbserver/ChangeLog:
>
> * gdbthread.h (find_thread, for_each_thread): New functions.
> * inferiors.c (thread_of_pid): Remove.
> (find_any_thread_of_pid): Use find_thread.
> * linux-low.c (num_lwps): Use for_each_thread.
I pushed this patch in.
Simon
^ permalink raw reply [flat|nested] 2+ messages in thread
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