From 640ea44ed59296df32b3f466e260103ccd00fbe3 Mon Sep 17 00:00:00 2001
From: Daniel Gorin <danielgo@meta.com>
Date: Tue, 21 Jan 2025 12:10:23 +0000
Subject: [PATCH] [pause_proc_timer][2/n] Add pause_proc_timer option to
 suspend_process/2

We add a new `pause_proc_timer` option to the `erlang:suspend_process/2`
BIF. When given, the process is not only suspended, but its proc timer,
if set, will be paused. This means that if the paused process is waiting
on a `receive`, it will not timeout even if suspended for long.

Each time pause_proc_timer is given, a counter is bumped in the
suspend-process monitor. In order to decrease it, the (new) BIF
`erlang:resume_process/2` needs to be called with the option
`resume_proc_timer`. When the count reaches zero, the timer is
resumed (even though the process may still be suspended).

We add testcases for this functionality
---
 erts/emulator/beam/atom.names           |   2 +
 erts/emulator/beam/bif.tab              |   2 +-
 erts/emulator/beam/erl_monitor_link.c   |   1 +
 erts/emulator/beam/erl_monitor_link.h   |   1 +
 erts/emulator/beam/erl_proc_sig_queue.c |  28 ++--
 erts/emulator/beam/erl_process.c        | 104 ++++++++++--
 erts/emulator/test/process_SUITE.erl    | 202 +++++++++++++++++++++++-
 erts/preloaded/ebin/erlang.beam         | Bin 40368 -> 40404 bytes
 erts/preloaded/ebin/erts_internal.beam  | Bin 10376 -> 10376 bytes
 erts/preloaded/src/erlang.erl           | 201 +++++++++++++----------
 erts/preloaded/src/erts_internal.erl    |   3 +-
 11 files changed, 435 insertions(+), 109 deletions(-)

diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names
index 56b8562ebb26..d8b1ca5e98c1 100644
--- a/erts/emulator/beam/atom.names
+++ b/erts/emulator/beam/atom.names
@@ -558,6 +558,7 @@ atom parent
 atom Plus='+'
 atom PlusPlus='++'
 atom pause
+atom pause_proc_timer
 atom pending
 atom pending_driver
 atom pending_process
@@ -620,6 +621,7 @@ atom reset
 atom reset_seq_trace
 atom restart
 atom resume
+atom resume_proc_timer
 atom return_from
 atom return_to
 atom return_to_trace
diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab
index 653e41a2c05a..f208b035a97c 100644
--- a/erts/emulator/beam/bif.tab
+++ b/erts/emulator/beam/bif.tab
@@ -220,7 +220,7 @@ bif erlang:seq_trace_info/1
 bif erlang:seq_trace_print/1
 bif erlang:seq_trace_print/2
 bif erts_internal:suspend_process/2
-bif erlang:resume_process/1
+bif erlang:resume_process/2
 bif erts_internal:process_display/2
 
 bif erlang:bump_reductions/1
diff --git a/erts/emulator/beam/erl_monitor_link.c b/erts/emulator/beam/erl_monitor_link.c
index 59506b10510c..2d53dead491e 100644
--- a/erts/emulator/beam/erl_monitor_link.c
+++ b/erts/emulator/beam/erl_monitor_link.c
@@ -1048,6 +1048,7 @@ erts_monitor_create(Uint16 type, Eterm ref, Eterm orgn, Eterm trgt, Eterm name,
 
         msp->next = NULL;
         erts_atomic_init_relb(&msp->state, 0);
+        msp->ptimer_count = 0;
         erts_atomic32_init_nob(&mdp->refc, 2);
         break;
     }
diff --git a/erts/emulator/beam/erl_monitor_link.h b/erts/emulator/beam/erl_monitor_link.h
index d099800c9780..574da11e2b17 100644
--- a/erts/emulator/beam/erl_monitor_link.h
+++ b/erts/emulator/beam/erl_monitor_link.h
@@ -733,6 +733,7 @@ struct ErtsMonitorSuspend__ {
     ErtsMonitorData md; /* origin = suspender; target = suspendee */
     ErtsMonitorSuspend *next;
     erts_atomic_t state;
+    int ptimer_count;
 };
 #define ERTS_MSUSPEND_STATE_FLG_ACTIVE ((erts_aint_t) (((Uint) 1) << (sizeof(Uint)*8 - 1)))
 #define ERTS_MSUSPEND_STATE_COUNTER_MASK (~ERTS_MSUSPEND_STATE_FLG_ACTIVE)
diff --git a/erts/emulator/beam/erl_proc_sig_queue.c b/erts/emulator/beam/erl_proc_sig_queue.c
index ea0fa38848bd..b303f76cdc15 100644
--- a/erts/emulator/beam/erl_proc_sig_queue.c
+++ b/erts/emulator/beam/erl_proc_sig_queue.c
@@ -4992,6 +4992,17 @@ handle_process_info(Process *c_p, ErtsSigRecvTracing *tracing,
     return ((int) reds)*4 + 8;
 }
 
+static void
+activate_suspend_monitor(Process *c_p, ErtsMonitorSuspend *msp)
+{
+    erts_aint_t mstate;
+
+    mstate = erts_atomic_read_bor_acqb(&msp->state,
+                                       ERTS_MSUSPEND_STATE_FLG_ACTIVE);
+    ASSERT(!(mstate & ERTS_MSUSPEND_STATE_FLG_ACTIVE)); (void) mstate;
+    erts_suspend(c_p, ERTS_PROC_LOCK_MAIN, NULL);
+}
+
 static void
 handle_suspend(Process *c_p, ErtsMonitor *mon, int *yieldp)
 {
@@ -5000,14 +5011,8 @@ handle_suspend(Process *c_p, ErtsMonitor *mon, int *yieldp)
     ASSERT(mon->type == ERTS_MON_TYPE_SUSPEND);
 
     if (!(state & ERTS_PSFLG_DIRTY_RUNNING)) {
-        ErtsMonitorSuspend *msp;
-        erts_aint_t mstate;
-
-        msp = (ErtsMonitorSuspend *) erts_monitor_to_data(mon);
-        mstate = erts_atomic_read_bor_acqb(&msp->state,
-                                           ERTS_MSUSPEND_STATE_FLG_ACTIVE);
-        ASSERT(!(mstate & ERTS_MSUSPEND_STATE_FLG_ACTIVE)); (void) mstate;
-        erts_suspend(c_p, ERTS_PROC_LOCK_MAIN, NULL);
+        ErtsMonitorSuspend *msp = (ErtsMonitorSuspend *) erts_monitor_to_data(mon);
+        activate_suspend_monitor(c_p, msp);
         *yieldp = !0;
     }
     else {
@@ -5213,12 +5218,7 @@ erts_proc_sig_handle_pending_suspend(Process *c_p)
         msp->next = NULL;
         if (!(state & ERTS_PSFLG_EXITING)
             && erts_monitor_is_in_table(&msp->md.u.target)) {
-            erts_aint_t mstate;
-
-            mstate = erts_atomic_read_bor_acqb(&msp->state,
-                                               ERTS_MSUSPEND_STATE_FLG_ACTIVE);
-            ASSERT(!(mstate & ERTS_MSUSPEND_STATE_FLG_ACTIVE)); (void) mstate;
-            erts_suspend(c_p, ERTS_PROC_LOCK_MAIN, NULL);
+            activate_suspend_monitor(c_p, msp);
         }
 
         erts_monitor_release(&msp->md.u.target);
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index fbf72b801857..aa7a58b6742f 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -8896,6 +8896,11 @@ erts_start_schedulers(void)
     }
 }
 
+static Eterm
+sched_pause_proc_timer(Process *c_p, void *vst, int *redsp, ErlHeapFragment **bp);
+static Eterm
+sched_resume_paused_proc_timer(Process *c_p, void *vst, int *redsp, ErlHeapFragment **bp);
+
 BIF_RETTYPE
 erts_internal_suspend_process_2(BIF_ALIST_2)
 {
@@ -8906,6 +8911,7 @@ erts_internal_suspend_process_2(BIF_ALIST_2)
     int sync = 0;
     int async = 0;
     int unless_suspending = 0;
+    int pause_proc_timer = 0;
     erts_aint_t mstate;
     ErtsMonitorSuspend *msp;
     ErtsMonitorData *mdp;
@@ -8930,6 +8936,9 @@ erts_internal_suspend_process_2(BIF_ALIST_2)
 	    case am_asynchronous:
 		async = 1;
 		break;
+            case am_pause_proc_timer:
+                pause_proc_timer = 1;
+                break;
 	    default: {
                 if (is_tuple_arity(arg, 2)) {
                     Eterm *tp = tuple_val(arg);
@@ -9029,15 +9038,31 @@ erts_internal_suspend_process_2(BIF_ALIST_2)
                 sync = !async;
             }
             else {
-            noproc:
-                erts_monitor_tree_delete(&ERTS_P_MONITORS(BIF_P), &mdp->origin);
-                erts_monitor_release_both(mdp);
-                if (!async)
-                    res = am_badarg;
+                goto noproc;
             }
         }
     }
 
+    if (pause_proc_timer) {
+        int proc_timer_already_paused = msp->ptimer_count++;
+
+        if (!proc_timer_already_paused) {
+            erts_proc_sig_send_rpc_request(BIF_P,
+                                           BIF_ARG_1,
+                                           0, /* no reply */
+                                           sched_pause_proc_timer,
+                                           NULL);
+        }
+    }
+
+    while(0) {
+    noproc:
+        erts_monitor_tree_delete(&ERTS_P_MONITORS(BIF_P), &mdp->origin);
+        erts_monitor_release_both(mdp);
+        if (!async)
+            res = am_badarg;
+    }
+
     if (sync) {
         ASSERT(is_non_value(reply_tag));
         reply_res = res;
@@ -9052,22 +9077,43 @@ erts_internal_suspend_process_2(BIF_ALIST_2)
 }
 
 /*
- * The erlang:resume_process/1 BIF
+ * The erlang:resume_process/2 BIF
  */
 
 BIF_RETTYPE
-resume_process_1(BIF_ALIST_1)
+resume_process_2(BIF_ALIST_2)
 {
     ErtsMonitor *mon;
     ErtsMonitorSuspend *msp;
     erts_aint_t mstate;
- 
+    int prev_suspend_count;
+    int resume_proc_timer = 0;
+
     if (BIF_P->common.id == BIF_ARG_1)
 	BIF_ERROR(BIF_P, BADARG);
 
     if (!is_internal_pid(BIF_ARG_1))
 	BIF_ERROR(BIF_P, BADARG);
 
+    if (is_not_nil(BIF_ARG_2)) {
+        /* Parse option list */
+        Eterm arg = BIF_ARG_2;
+                while (is_list(arg)) {
+            Eterm *lp = list_val(arg);
+            arg = CAR(lp);
+            switch (arg) {
+            case am_resume_proc_timer:
+                resume_proc_timer = 1;
+                break;
+        default:
+                BIF_ERROR(BIF_P, BADARG);
+            }
+        arg = CDR(lp);
+        }
+    if (is_not_nil(arg))
+            BIF_ERROR(BIF_P, BADARG);
+    }
+
     mon = erts_monitor_tree_lookup(ERTS_P_MONITORS(BIF_P),
                                    BIF_ARG_1);
     if (!mon) {
@@ -9078,11 +9124,32 @@ resume_process_1(BIF_ALIST_1)
     ASSERT(mon->type == ERTS_MON_TYPE_SUSPEND);
     msp = (ErtsMonitorSuspend *) erts_monitor_to_data(mon);
 
+    if (resume_proc_timer && msp->ptimer_count == 0) {
+        BIF_ERROR(BIF_P, BADARG);
+    }
+
     mstate = erts_atomic_dec_read_relb(&msp->state);
+    prev_suspend_count = mstate & ERTS_MSUSPEND_STATE_COUNTER_MASK;
 
-    ASSERT((mstate & ERTS_MSUSPEND_STATE_COUNTER_MASK) >= 0);
+    ASSERT(prev_suspend_count >= 0);
+
+    if (msp->ptimer_count == prev_suspend_count + 1 && !resume_proc_timer) {
+        erts_atomic_inc_nob(&msp->state);
+        BIF_ERROR(BIF_P, BADARG);
+    }
 
-    if ((mstate & ERTS_MSUSPEND_STATE_COUNTER_MASK) == 0) {
+    if (resume_proc_timer) {
+        int needs_to_resume_timer = --msp->ptimer_count == 0;
+        if (needs_to_resume_timer) {
+            erts_proc_sig_send_rpc_request(BIF_P,
+                                           BIF_ARG_1,
+                                           0, /* no reply */
+                                           sched_resume_paused_proc_timer,
+                                           NULL);
+        }
+    }
+
+    if (prev_suspend_count == 0) {
         erts_monitor_tree_delete(&ERTS_P_MONITORS(BIF_P), mon);
         erts_proc_sig_send_demonitor(&BIF_P->common, BIF_P->common.id, 0, mon);
     }
@@ -9090,6 +9157,23 @@ resume_process_1(BIF_ALIST_1)
     BIF_RET(am_true);
 }
 
+static Eterm
+sched_pause_proc_timer(Process *c_p, void *vst, int *redsp, ErlHeapFragment **bp)
+{
+    erts_pause_proc_timer(c_p);
+    *redsp = 1;
+    return THE_NON_VALUE;
+}
+
+static Eterm
+sched_resume_paused_proc_timer(Process *c_p, void *vst, int *redsp, ErlHeapFragment **bp)
+{
+    erts_resume_paused_proc_timer(c_p);
+    *redsp = 1;
+    return THE_NON_VALUE;
+}
+
+
 BIF_RETTYPE
 erts_internal_is_process_executing_dirty_1(BIF_ALIST_1)
 {
diff --git a/erts/emulator/test/process_SUITE.erl b/erts/emulator/test/process_SUITE.erl
index becb2c983d6e..cd4c2d964d5d 100644
--- a/erts/emulator/test/process_SUITE.erl
+++ b/erts/emulator/test/process_SUITE.erl
@@ -24,6 +24,7 @@
 %% 	exit/1
 %%	exit/2
 %%	process_info/1,2
+%%      suspend_process/2 (partially)
 %%	register/2 (partially)
 
 -include_lib("stdlib/include/assert.hrl").
@@ -56,6 +57,11 @@
          process_info_msgq_len_no_very_long_delay/1,
          process_info_dict_lookup/1,
          process_info_label/1,
+         suspend_process_pausing_proc_timer/1,
+         suspend_process_pausing_proc_timer_after_suspended/1,
+         resume_process_resuming_proc_timer_can_resume_timer_early/1,
+         suspend_process_pausing_proc_timer_needs_balanced_resume_procs/1,
+         suspend_process_pausing_proc_timer_stress_test/1,
 	 bump_reductions/1, low_prio/1, binary_owner/1, yield/1, yield2/1,
 	 otp_4725/1, dist_unlink_ack_exit_leak/1, bad_register/1,
          garbage_collect/1, otp_6237/1,
@@ -132,6 +138,7 @@ all() ->
      otp_6237,
      {group, spawn_request},
      {group, process_info_bif},
+     {group, suspend_process_bif},
      {group, processes_bif},
      {group, otp_7738}, garb_other_running,
      {group, system_task},
@@ -187,6 +194,12 @@ groups() ->
        process_info_msgq_len_no_very_long_delay,
        process_info_dict_lookup,
        process_info_label]},
+     {suspend_process_bif, [],
+      [suspend_process_pausing_proc_timer,
+       suspend_process_pausing_proc_timer_after_suspended,
+       resume_process_resuming_proc_timer_can_resume_timer_early,
+       suspend_process_pausing_proc_timer_needs_balanced_resume_procs,
+       suspend_process_pausing_proc_timer_stress_test]},
      {otp_7738, [],
       [otp_7738_waiting, otp_7738_suspended,
        otp_7738_resume]},
@@ -1777,6 +1790,193 @@ proc_dict_helper() ->
     end,
     proc_dict_helper().
 
+suspend_process_pausing_proc_timer(_Config) ->
+    BeforeSuspend = fun(_Pid) -> ok end,
+    AfterResume = fun(_Pid) -> ok end,
+    suspend_process_pausing_proc_timer_aux(BeforeSuspend, AfterResume),
+    ok.
+
+suspend_process_pausing_proc_timer_after_suspended(_Config) ->
+    % We suspend the process once before using pause_proc_timer
+    BeforeSuspend = fun(Pid) -> true = erlang:suspend_process(Pid) end,
+    AfterResume = fun(Pid) -> true = erlang:resume_process(Pid) end,
+    suspend_process_pausing_proc_timer_aux(BeforeSuspend, AfterResume),
+    ok.
+
+suspend_process_pausing_proc_timer_aux(BeforeSuspend, AfterResume) ->
+    TcProc = self(),
+    Pid = erlang:spawn_link(
+        fun() ->
+            TcProc ! {sync, self()},
+            receive go -> ok
+            after 2_000 -> exit(timer_not_paused)
+            end,
+            TcProc ! {sync, self()},
+            receive _ -> error(unexpected)
+            after 2_000 -> ok
+            end,
+            TcProc ! {sync, self()}
+        end
+    ),
+
+    WaitForSync = fun () ->
+        receive {sync, Pid} -> ok
+        after 10_000 -> error(timeout)
+        end
+    end,
+    EnsureWaiting = fun() ->
+        wait_until(fun () -> process_info(Pid, status) == {status, waiting} end)
+    end,
+
+    WaitForSync(),
+    EnsureWaiting(),
+
+    BeforeSuspend(Pid),
+    true = erlang:suspend_process(Pid, [pause_proc_timer]),
+    timer:sleep(5_000),
+    true = erlang:resume_process(Pid, [resume_proc_timer]),
+    AfterResume(Pid),
+    timer:sleep(1_000),
+    Pid ! go,
+
+    WaitForSync(),
+    EnsureWaiting(),
+
+    BeforeSuspend(Pid),
+    true = erlang:suspend_process(Pid, [pause_proc_timer]),
+    true = erlang:resume_process(Pid, [resume_proc_timer]),
+    AfterResume(Pid),
+    WaitForSync(),
+    ok.
+
+resume_process_resuming_proc_timer_can_resume_timer_early(_Config) ->
+    TcProc = self(),
+    Pid = erlang:spawn_link(
+        fun() ->
+            TcProc ! {sync, self()},
+            receive go -> error(received_go)
+            after 2_000 -> TcProc ! {sync, self()}
+            end
+        end
+    ),
+
+    WaitForSync = fun () ->
+        receive {sync, Pid} -> ok
+        after 10_000 -> error(timeout)
+        end
+    end,
+    EnsureWaiting = fun() ->
+        wait_until(fun () -> process_info(Pid, status) == {status, waiting} end)
+    end,
+
+
+    WaitForSync(),
+    EnsureWaiting(),
+
+    % Suspend twice, but pause the proc timer only once
+    true = erlang:suspend_process(Pid),
+    true = erlang:suspend_process(Pid, [pause_proc_timer]),
+
+    % Pid is suspended so will not process it just yet
+    Pid ! go,
+
+    % At this point the process is still suspended but the timer is running again
+    true = erlang:resume_process(Pid, [resume_proc_timer]),
+    ?assertEqual({status, suspended}, process_info(Pid, status)),
+
+    % The timer must have expired by now
+    timer:sleep(5_000),
+
+    true = erlang:resume_process(Pid),
+    WaitForSync(),
+
+    ok.
+
+suspend_process_pausing_proc_timer_needs_balanced_resume_procs(_Config) ->
+    Pid = erlang:spawn_link(timer, sleep, [infinity]),
+
+    true = erlang:suspend_process(Pid),
+    ?assertEqual({status, suspended}, process_info(Pid, status)),
+
+    % No pause_proc_timer so far, so fail
+    ?assertMatch({'EXIT', {badarg, _}},
+                 catch erlang:resume_process(Pid, [resume_proc_timer])),
+    ?assertEqual({status, suspended}, process_info(Pid, status)),
+
+
+    true = erlang:suspend_process(Pid),
+    true = erlang:suspend_process(Pid, [pause_proc_timer]),
+    true = erlang:suspend_process(Pid, [pause_proc_timer]),
+
+    % It is ok to do out-of-order resumes; here one that doesn't resume the timer
+    true = erlang:resume_process(Pid),
+    ?assertEqual({status, suspended}, process_info(Pid, status)),
+
+    % Do more resumes, in any order
+    true = erlang:resume_process(Pid, [resume_proc_timer]),
+    true = erlang:resume_process(Pid),
+    ?assertEqual({status, suspended}, process_info(Pid, status)),
+
+    % Only one suspend remains, and it used pause_proc_timer, so fail if not resuming timer
+    ?assertMatch({'EXIT', {badarg, _}},
+                 catch erlang:resume_process(Pid)),
+    ?assertEqual({status, suspended}, process_info(Pid, status)),
+
+    % Final resume, now running
+    true = erlang:resume_process(Pid, [resume_proc_timer]),
+    ?assertEqual({status, running}, process_info(Pid, status)),
+
+    ok.
+
+suspend_process_pausing_proc_timer_stress_test(_Config) ->
+    TestCaseProc = self(),
+    RunTest = fun() ->
+        TestRunner = self(),
+        ActionDoneRef = erlang:make_ref(),
+        P = erlang:spawn(fun() ->
+            receive
+                 _ ->
+                    TestRunner ! {recv, ActionDoneRef}
+            after
+                0 -> TestRunner ! {timeout, ActionDoneRef}
+            end
+        end),
+
+        try erlang:suspend_process(P, [pause_proc_timer]) of
+            true -> ok
+        catch
+            error:badarg ->
+                false = erlang:is_process_alive(P),
+                ok;
+            error:exited ->
+                ok
+        end,
+
+        P ! 'wake up!',
+
+        try erlang:resume_process(P, [resume_proc_timer]) of
+            true -> ok
+        catch
+            error:badarg ->
+                false = erlang:is_process_alive(P),
+                ok
+        end,
+
+        receive
+            {_, ActionDoneRef} -> TestCaseProc ! {ok, TestRunner}
+        end
+    end,
+
+    NumInstances = 100_000,
+    TestRunners = [erlang:spawn(RunTest) || _ <- lists:seq(1, NumInstances)],
+    [
+        receive {ok, P} -> ok
+        after 2_000 -> error({timeout, waiting_for_runner})
+        end
+        || P <- TestRunners
+    ],
+    ok.
+
 %% Tests erlang:bump_reductions/1.
 bump_reductions(Config) when is_list(Config) ->
     erlang:garbage_collect(),
@@ -3160,7 +3360,7 @@ spawn_huge_arglist_test(Local, Node, ArgList) ->
         {'DOWN', R2, process, Pid2, Reason2} ->
             ArgList = Reason2
     end,
-    
+
     {Pid3, R3} = case Local of
                      true ->
                          spawn_opt(?MODULE, huge_arglist_child, ArgList, [monitor]);
diff --git a/erts/preloaded/ebin/erlang.beam b/erts/preloaded/ebin/erlang.beam
index 2315ec378407aa3bc81f90fa042e2233e70b8263..797941d3e94f846f930660a05eaf6c3b2de37d31 100644
GIT binary patch
delta 17961
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zriU~3KAbUP^n_znm+QtC;-hL3<C;#L<8ozJxDNfx?B{aH7xSNWm(^WfcT3%xy6tt3
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diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 304f6bdcc7db..b02b6391ee5b 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -469,7 +469,7 @@ A list of binaries. This datatype is useful to use together with
 -export([processes_iterator/0, processes_next/1]).
 -export([put/2, raise/3, read_timer/1, read_timer/2, ref_to_list/1, register/2]).
 -export([send_after/3, send_after/4, start_timer/3, start_timer/4]).
--export([registered/0, resume_process/1, round/1, self/0]).
+-export([registered/0, resume_process/1, resume_process/2, round/1, self/0]).
 -export([seq_trace/2, seq_trace_print/1, seq_trace_print/2, setnode/2]).
 -export([setnode/3, size/1, spawn/3, spawn_link/3, split_binary/2]).
 -export([suspend_process/2, system_monitor/0]).
@@ -800,7 +800,7 @@ atom_to_list(_Atom) ->
 -doc """
 Extracts the part of the binary described by `PosLen`.
 
-Negative length can be used to extract bytes at the end of a binary. 
+Negative length can be used to extract bytes at the end of a binary.
 
 For example:
 
@@ -2189,12 +2189,12 @@ dt_put_tag(_IoData) ->
       TagData :: term().
 dt_restore_tag(_TagData) ->
     erlang:nif_error(undefined).
-    
+
 %% dt_spread_tag/1
 -doc false.
 -spec dt_spread_tag(boolean()) -> TagData when
       TagData :: term().
-dt_spread_tag(_Bool) ->   
+dt_spread_tag(_Bool) ->
     erlang:nif_error(undefined).
 
 %% erase/0
@@ -3762,7 +3762,7 @@ list_to_existing_atom(_String) ->
 
 %% list_to_float/1
 -doc """
-Returns the float whose text representation is `String`. 
+Returns the float whose text representation is `String`.
 
 For example:
 
@@ -3946,7 +3946,7 @@ identifier.
       String :: string().
 list_to_port(_String) ->
     erlang:nif_error(undefined).
- 
+
 %% list_to_ref/1
 -doc """
 Returns a reference whose text representation is a `String`.
@@ -5539,6 +5539,21 @@ registered() ->
 %% resume_process/1
 -doc """
 Decreases the suspend count on the process identified by `Suspendee`.
+Equivalent to calling [`erlang:resume_process(Suspendee, [])`](`resume_process/2`).
+
+> #### Warning {: .warning }
+>
+> This BIF is intended for debugging only.
+""".
+-doc #{ category => processes }.
+-spec resume_process(Suspendee) -> true when
+      Suspendee :: pid().
+resume_process(Suspendee) ->
+    resume_process(Suspendee, []).
+
+%% resume_process/2
+-doc """
+Decreases the suspend count on the process identified by `Suspendee`.
 
 `Suspendee` is previously to have been suspended through
 [`erlang:suspend_process/2`](`suspend_process/2`) or
@@ -5547,6 +5562,11 @@ Decreases the suspend count on the process identified by `Suspendee`.
 reaches zero, `Suspendee` is resumed, that is, its state is changed from
 suspended into the state it had before it was suspended.
 
+Options (`Opt`s):
+
+- **`resume_proc_timer`** - Decrease the paused time count. If it reaches
+  zero, the timer will be resumed.
+
 > #### Warning {: .warning }
 >
 > This BIF is intended for debugging only.
@@ -5559,14 +5579,25 @@ Failures:
   previously increased the suspend count on the process identified by
   `Suspendee`.
 
+- **`badarg`** - If the `resume_proc_timer` `Opt` is given, but the paused
+  timer count is already 0; or if it was not given and the paused timer
+  counte equals the suspended count. Intuitively, the usages of the
+  `pause_proc_timer` option of  [`suspend_process/2`] and `resume_proc_timer`
+  need to balance out.
+
 - **`badarg`** - If the process identified by `Suspendee` is not alive.
+
+- **`badarg`** - If `OptList` is not a proper list of valid `Opt`s.
 """.
 -doc #{ group => processes }.
--spec resume_process(Suspendee) -> true when
-      Suspendee :: pid().
-resume_process(_Suspendee) ->
+-spec resume_process(Suspendee, OptList) -> true when
+      Suspendee :: pid(),
+      OptList :: [Opt],
+      Opt :: resume_proc_timer.
+resume_process(_Suspendee, _OptList) ->
     erlang:nif_error(undefined).
 
+
 %% round/1
 %% Shadowed by erl_bif_types: erlang:round/1
 -doc """
@@ -5918,6 +5949,11 @@ Options (`Opt`s):
   Apart from the reply message, the `{asynchronous, ReplyTag}` option behaves
   exactly the same as the `asynchronous` option without reply tag.
 
+- **`pause_proc_timer`** - If `Suspendee` is waiting on a message, pause the timer
+  associated with the `after` clause. The paused timer count is increased, so
+  a corresponding call to [`resume_process/2`] will need to use the `resume_proc_timer`
+  option to decrease it.
+
 - **`unless_suspending`** - The process identified by `Suspendee` is suspended
   unless the calling process already is suspending `Suspendee`. If
   `unless_suspending` is combined with option `asynchronous`, a suspend request
@@ -5964,7 +6000,8 @@ Failures:
 -spec suspend_process(Suspendee, OptList) -> boolean() when
       Suspendee :: pid(),
       OptList :: [Opt],
-      Opt :: unless_suspending | asynchronous | {asynchronous, term()}.
+      Opt :: unless_suspending | pause_proc_timer
+           | asynchronous | {asynchronous, term()}.
 suspend_process(Suspendee, OptList) ->
     case case erts_internal:suspend_process(Suspendee, OptList) of
 	     Ref when erlang:is_reference(Ref) ->
@@ -7390,7 +7427,7 @@ of the flag.
   process_flag(async_dist, boolean())
   ```
   {: #process_flag_async_dist }
-  
+
   Enable or disable _fully asynchronous distributed signaling_ for the calling
   process. When disabled, which is the default, the process sending a distributed
   signal will block in the send operation if the buffer for the distribution
@@ -7400,7 +7437,7 @@ of the flag.
   operations of distributed signals will always buffer the signal on the outgoing
   distribution channel and then immediately return. That is, these send operations
   will _never_ block the sending process.
-  
+
   > #### Note {: .info }
   >
   > Since no flow control is enforced by the runtime system when `async_dist`
@@ -7409,14 +7446,14 @@ of the flag.
   > Unlimited signaling with `async_dist` enabled in the absence of flow control
   > will typically cause the sending runtime system to crash on an out of memory
   > condition.
-  
+
   Blocking due to disabled `async_dist` can be monitored by
   [`trace:system()`](`trace:system/3`) using the
   [`busy_dist_port`](`m:trace#busy_dist_port`) option. Only data buffered by
   processes which (at the time of sending a signal) have disabled `async_dist`
   will be counted when determining whether or not an operation should block the
   caller.
-  
+
   The `async_dist` flag can also be set on a new process when spawning it using
   the [`spawn_opt()`](`spawn_opt/4`) BIF with the option
   [`{async_dist, Enable}`](#spawn_opt_async_dist). The default
@@ -7424,192 +7461,192 @@ of the flag.
   command line argument [`+pad <boolean>`](erl_cmd.md#%2Bpad) when starting the
   runtime system. If the `+pad <boolean>` command line argument is not passed, the
   default value of the `async_dist` flag will be `false`.
-  
+
   You can inspect the state of the `async_dist` process flag of a process by
   calling [`process_info(Pid, async_dist)`](#process_info_async_dist).
-  
+
 - ```erlang
   process_flag(trap_exit, boolean())
   ```
   {: #process_flag_trap_exit }
-  
+
   When `trap_exit` is set to `true`, exit signals arriving to a process are
   converted to `{'EXIT', From, Reason}` messages, which can be received as
   ordinary messages. If `trap_exit` is set to `false`, the process exits if it
   receives an exit signal other than `normal` and the exit signal is propagated to
   its linked processes. Application processes are normally not to trap exits.
-  
+
   See also `exit/2`.
-  
+
 - ```erlang
   process_flag(error_handler, module())
   ```
   {: #process_flag_error_handler }
-  
+
   Used by a process to redefine the `m:error_handler` for undefined function calls and
   undefined registered processes. Use this flag with substantial caution, as code
   auto-loading depends on the correct operation of the error handling module.
-  
+
 - ```erlang
   process_flag(fullsweep_after,  non_neg_integer())
   ```
-  
+
   Changes the maximum number of generational collections before forcing a
   fullsweep for the calling process.
-  
+
 - ```erlang
   process_flag(min_heap_size, non_neg_integer())
   ```
   {: #process_flag_min_heap_size }
-  
+
   Changes the minimum heap size for the calling process.
-  
+
 - ```erlang
   process_flag(min_bin_vheap_size, non_neg_integer())
   ```
-  
+
   Changes the minimum binary virtual heap size for the calling process.
-  
+
 - ```erlang
   process_flag(max_heap_size, max_heap_size())
   ```
   {: #process_flag_max_heap_size }
-  
+
   This flag sets the maximum heap size for the calling process. If `MaxHeapSize`
   is an integer, the system default values for `kill` and `error_logger` are used.
-  
+
   For details on how the heap grows, see
   [Sizing the heap](GarbageCollection.md#sizing-the-heap) in the ERTS internal
   documentation.
-  
+
   - **`size`** - The maximum size in words of the process. If set to zero, the
     heap size limit is disabled. `badarg` is be thrown if the value is smaller
     than [`min_heap_size`](#process_flag_min_heap_size). The size check
     is only done when a garbage collection is triggered.
-  
+
     `size` is the entire heap of the process when garbage collection is triggered.
     This includes all generational heaps, the process stack, any
     [messages that are considered to be part of the heap](#process_flag_message_queue_data),
     and any extra memory that the garbage collector needs during collection.
-  
+
     `size` is the same as can be retrieved using
     [`erlang:process_info(Pid, total_heap_size)`](#process_info_total_heap_size),
     or by adding `heap_block_size`, `old_heap_block_size` and `mbuf_size` from
     [`erlang:process_info(Pid, garbage_collection_info)`](#process_info_garbage_collection_info).
-  
+
   - **`kill`** - When set to `true`, the runtime system sends an untrappable exit
     signal with reason `kill` to the process if the maximum heap size is reached.
     The garbage collection that triggered the `kill` is not completed, instead the
     process exits as soon as possible. When set to `false`, no exit signal is sent
     to the process, instead it continues executing.
-  
+
     If `kill` is not defined in the map, the system default will be used. The
     default system default is `true`. It can be changed by either option
     [\+hmaxk](erl_cmd.md#%2Bhmaxk) in [erl](erl_cmd.md), or
     [`erlang:system_flag(max_heap_size, MaxHeapSize)`](#system_flag_max_heap_size).
-  
+
   - **`error_logger`** - When set to `true`, the runtime system logs an error
     event via `m:logger`, containing details about the process when the maximum
     heap size is reached. One log event is sent each time the limit is reached.
-  
+
     If `error_logger` is not defined in the map, the system default is used. The
     default system default is `true`. It can be changed by either the option
     [\+hmaxel](erl_cmd.md#%2Bhmaxel) int [erl](erl_cmd.md), or
     [`erlang:system_flag(max_heap_size, MaxHeapSize)`](#system_flag_max_heap_size).
-  
+
   - **`include_shared_binaries`** - When set to `true`, off-heap binaries are
     included in the total sum compared against the `size` limit. Off-heap binaries
     are typically larger binaries that may be shared between processes. The size
     of a shared binary is included by all processes that are referring it. Also,
     the entire size of a large binary may be included even if only a smaller part
     of it is referred by the process.
-  
+
     If `include_shared_binaries` is not defined in the map, the system default is
     used. The default system default is `false`. It can be changed by either the
     option [\+hmaxib](erl_cmd.md#%2Bhmaxib) in [erl](erl_cmd.md), or
     [`erlang:system_flag(max_heap_size, MaxHeapSize)`](#system_flag_max_heap_size).
-  
+
   The heap size of a process is quite hard to predict, especially the amount of
   memory that is used during the garbage collection. When contemplating using this
   option, it is recommended to first run it in production with `kill` set to
   `false` and inspect the log events to see what the normal peak sizes of the
   processes in the system is and then tune the value accordingly.
-  
+
 - ```erlang
   process_flag(message_queue_data, message_queue_data())
   ```
   {: #process_flag_message_queue_data }
-  
+
   Determines how messages in the message queue are stored, as follows:
-  
+
   - **`off_heap`** - _All_ messages in the message queue will be stored outside
     the process heap. This implies that _no_ messages in the message queue will be
     part of a garbage collection of the process.
-  
+
   - **`on_heap`** - All messages in the message queue will eventually be placed on
     the process heap. They can, however, be temporarily stored off the heap. This
     is how messages have always been stored up until ERTS 8.0.
-  
+
   The default value of the `message_queue_data` process flag is determined by the
   command-line argument [`+hmqd`](erl_cmd.md#%2Bhmqd) in [erl](erl_cmd.md).
-  
+
   If the process may potentially accumulate a large number of messages in its
   queue it is recommended to set the flag value to `off_heap`. This is due to the
   fact that the garbage collection of a process that has a large number of
   messages stored on the heap can become extremely expensive and the process can
   consume large amounts of memory. The performance of the actual message passing
   is, however, generally better when the flag value is `on_heap`.
-  
+
   Changing the flag value causes any existing messages to be moved. The move
   operation is initiated, but not necessarily completed, by the time the function
   returns.
-  
+
 - ```erlang
   process_flag(priority, priority_level())
   ```
   {: #process_flag_priority }
-  
+
   Sets the process priority. `Level` is an atom. Four priority levels exist:
   `low`, `normal`, `high`, and `max`. Default is `normal`.
-  
+
   > #### Note {: .info }
   >
   > Priority level `max` is reserved for internal use in the Erlang runtime
   > system, and is _not_ to be used by others.
-  
+
   Internally in each priority level, processes are scheduled in a round robin
   fashion.
-  
+
   Execution of processes on priority `normal` and `low` are interleaved. Processes
   on priority `low` are selected for execution less frequently than processes on
   priority `normal`.
-  
+
   When runnable processes on priority `high` exist, no processes on priority `low`
   or `normal` are selected for execution. Notice however that this does _not_ mean
   that no processes on priority `low` or `normal` can run when processes are
   running on priority `high`. When using multiple schedulers, more processes can
   be running in parallel than processes on priority `high`. That is, a `low` and a
   `high` priority process can execute at the same time.
-  
+
   When runnable processes on priority `max` exist, no processes on priority `low`,
   `normal`, or `high` are selected for execution. As with priority `high`,
   processes on lower priorities can execute in parallel with processes on priority
   `max`.
-  
+
   Scheduling is pre-emptive. Regardless of priority, a process is pre-empted when
   it has consumed more than a certain number of reductions since the last time it
   was selected for execution.
-  
+
   > #### Note {: .info }
   >
   > Do not depend on the scheduling to remain exactly as it is today. Scheduling
   > is likely to be changed in a future release to use available processor cores
   > better.
-  
+
   There is _no_ automatic mechanism for avoiding priority inversion, such as
   priority inheritance or priority ceilings. When using priorities, take this into
   account and handle such scenarios by yourself.
-  
+
   Making calls from a `high` priority process into code that you has no control
   over can cause the `high` priority process to wait for a process with lower
   priority. That is, effectively decreasing the priority of the `high` priority
@@ -7617,17 +7654,17 @@ of the flag.
   code that you have no control over, it can be the case in a future version of
   it. This can, for example, occur if a `high` priority process triggers code
   loading, as the code server runs on priority `normal`.
-  
+
   Other priorities than `normal` are normally not needed. When other priorities
   are used, use them with care, _especially_ priority `high`. A process on
   priority `high` is only to perform work for short periods. Busy looping for long
   periods in a `high` priority process causes most likely problems, as important
   OTP servers run on priority `normal`.
-  
+
 - ```erlang
   process_flag(save_calls, 0..10000)
   ```
-  
+
   `N` must be an integer in the interval 0..10000. If `N` > 0, call saving is made
   active for the process. This means that information about the `N` most recent
   global function calls, BIF calls, sends, and receives made by the process are
@@ -7635,40 +7672,40 @@ of the flag.
   [`process_info(Pid, last_calls)`](`process_info/2`). A global function call is
   one in which the module of the function is explicitly mentioned. Only a fixed
   amount of information is saved, as follows:
-  
+
   - A tuple `{Module, Function, Arity}` for function calls
   - The atoms `send`, `'receive'`, and `timeout` for sends and receives
     (`'receive'` when a message is received and `timeout` when a receive times
     out)
-  
+
   If `N` = 0, call saving is disabled for the process, which is the default.
   Whenever the size of the call saving list is set, its contents are reset.
-  
+
 - ```erlang
   process_flag(sensitive, boolean())
   ```
-  
+
   Sets or clears flag `sensitive` for the current process. When a process has been
   marked as sensitive by calling
   [`process_flag(sensitive, true)`](`process_flag/2`), features in the runtime
   system that can be used for examining the data or inner working of the process
   are silently disabled.
-  
+
   Features that are disabled include (but are not limited to) the following:
-  
+
   - Tracing. Trace flags can still be set for the process, but no trace messages
     of any kind are generated. (If flag `sensitive` is turned off, trace messages
     are again generated if any trace flags are set.)
   - Sequential tracing. The sequential trace token is propagated as usual, but no
     sequential trace messages are generated.
-  
+
   `process_info/1,2` cannot be used to read out the message queue or the process
   dictionary (both are returned as empty lists).
-  
+
   Stack back-traces cannot be displayed for the process.
-  
+
   In crash dumps, the stack, messages, and the process dictionary are omitted.
-  
+
   If `{save_calls,N}` has been set for the process, no function calls are saved to
   the call saving list. (The call saving list is not cleared. Also, send, receive,
   and time-out events are still added to the list.)
@@ -8746,7 +8783,7 @@ The possible flags are:
       ActiveTime  :: non_neg_integer(),
       TotalTime   :: non_neg_integer();
 		(total_active_tasks) -> ActiveTasks when
-      ActiveTasks :: non_neg_integer(); 
+      ActiveTasks :: non_neg_integer();
 		(total_active_tasks_all) -> ActiveTasks when
       ActiveTasks :: non_neg_integer();
                 (total_run_queue_lengths) -> TotalRunQueueLengths when
@@ -9358,7 +9395,7 @@ Currently supported options:
     compression either does or does not produce a smaller result than level 1
     compression.
 
-- **`{minor_version, Version}`**(Since R11B-4)  
+- **`{minor_version, Version}`**(Since R11B-4)
   The option can be used to control some encoding details. Valid values for
   `Version` are:
 
@@ -9381,7 +9418,7 @@ Currently supported options:
     unconditionally encoded using utf8. Erlang/OTP systems as of R16B can decode
     this representation.
 
-- **`deterministic`**(Since OTP 24.1)  
+- **`deterministic`**(Since OTP 24.1)
   This option can be used to ensure that, within the same major release of
   Erlang/OTP, the same encoded representation is returned for the same term.
   There is still no guarantee that the encoded representation remains the same
@@ -9389,7 +9426,7 @@ Currently supported options:
 
   This option cannot be combined with the `local` option.
 
-- **`local`[](){: #term_to_binary_local } **(Since OTP 26.0)  
+- **`local`[](){: #term_to_binary_local } **(Since OTP 26.0)
    This option will cause encoding of `Term` to an alternative local version of the
   external term format which when decoded by the same runtime system instance will
   produce a term identical to the encoded term even when the node name and/or [creation](#system_info_creation)
@@ -10185,7 +10222,7 @@ spawn_monitor(N,M,F,A) when erlang:is_atom(N),
         {spawn_reply, Ref, error, badopt} ->
             badarg_with_info([N, M, F, A]);
         {spawn_reply, Ref, error, noconnection} ->
-            try 
+            try
                 erlang:spawn_opt(erts_internal,crasher,
                                  [N,M,F,A,[monitor],
                                   noconnection],
@@ -10363,7 +10400,7 @@ spawn_opt(N, M, F, A, O) when erlang:is_atom(N),
     end;
 spawn_opt(N,M,F,A,O) ->
     badarg_with_info([N,M,F,A,O]).
-    
+
 %%
 %% spawn_request/1
 %%
@@ -11610,7 +11647,7 @@ port_info(Port, Item) ->
 -spec port_set_data(Port, Data) -> 'true' when
       Port :: port() | atom(),
       Data :: term().
-    
+
 port_set_data(_Port, _Data) ->
     erlang:nif_error(undefined).
 
@@ -11969,14 +12006,14 @@ integer_to_binary(_I, _Base) ->
 
 %% erlang:set_cpu_topology/1 is for internal use only!
 %%
-%% erlang:system_flag(cpu_topology, CpuTopology) traps to 
+%% erlang:system_flag(cpu_topology, CpuTopology) traps to
 %% erlang:set_cpu_topology(CpuTopology).
 -doc false.
 set_cpu_topology(CpuTopology) ->
     try format_cpu_topology(erlang:system_flag(internal_cpu_topology,
 					       cput_e2i(CpuTopology)))
     catch
-	Class:Exception when Class =/= error; Exception =/= internal_error -> 
+	Class:Exception when Class =/= error; Exception =/= internal_error ->
 	    badarg_with_info([CpuTopology])
     end.
 
@@ -12001,9 +12038,9 @@ cput_e2i(undefined) ->
 cput_e2i(E) ->
     rvrs(cput_e2i(E, -1, -1, #cpu{}, 0, cput_e2i_clvl(E, 0), [])).
 
-cput_e2i([], _NId, _PId, _IS, _PLvl, _Lvl, Res) -> 
+cput_e2i([], _NId, _PId, _IS, _PLvl, _Lvl, Res) ->
     Res;
-cput_e2i([E|Es], NId0, PId, IS, PLvl, Lvl, Res0) -> 
+cput_e2i([E|Es], NId0, PId, IS, PLvl, Lvl, Res0) ->
     case cput_e2i(E, NId0, PId, IS, PLvl, Lvl, Res0) of
 	[] ->
 	    cput_e2i(Es, NId0, PId, IS, PLvl, Lvl, Res0);
@@ -12638,7 +12675,7 @@ gc_info(_Ref, 0, {Colls,Recl}) ->
     {Colls,Recl,0};
 gc_info(Ref, N, {OrigColls,OrigRecl}) ->
     receive
-	{Ref, {_,Colls, Recl}} -> 
+	{Ref, {_,Colls, Recl}} ->
 	    gc_info(Ref, N-1, {Colls+OrigColls,Recl+OrigRecl})
     end.
 
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index 344a3be05f77..626dedf0a3f8 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -841,7 +841,8 @@ gather_carrier_info(_) ->
       Result :: boolean() | 'badarg' | reference(),
       Suspendee :: pid(),
       OptList :: [Opt],
-      Opt :: unless_suspending | asynchronous | {asynchronous, term()}.
+      Opt :: unless_suspending | pause_proc_timer
+           | asynchronous | {asynchronous, term()}.
 
 suspend_process(_Suspendee, _OptList) ->
     erlang:nif_error(undefined).