From 188faf19b9589112ca53fd0f5a1c0b3819dcdf43 Mon Sep 17 00:00:00 2001
From: Daniel Gorin <danielgo@meta.com>
Date: Wed, 27 Nov 2024 15:01:01 +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 |  30 ++---
 erts/emulator/beam/erl_process.c        | 108 +++++++++++++++--
 erts/emulator/test/process_SUITE.erl    | 151 +++++++++++++++++++++++-
 erts/preloaded/ebin/erlang.beam         | Bin 40020 -> 40060 bytes
 erts/preloaded/ebin/erts_internal.beam  | Bin 10000 -> 10000 bytes
 erts/preloaded/src/erlang.erl           |  47 +++++++-
 erts/preloaded/src/erts_internal.erl    |   3 +-
 11 files changed, 313 insertions(+), 32 deletions(-)

diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names
index c264082e7561..d122cac4ba4e 100644
--- a/erts/emulator/beam/atom.names
+++ b/erts/emulator/beam/atom.names
@@ -553,6 +553,7 @@ atom parent
 atom Plus='+'
 atom PlusPlus='++'
 atom pause
+atom pause_proc_timer
 atom pending
 atom pending_driver
 atom pending_process
@@ -615,6 +616,7 @@ 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 c7aa2bff1c78..1b2823351a98 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..3f19a1558e71 100644
--- a/erts/emulator/beam/erl_proc_sig_queue.c
+++ b/erts/emulator/beam/erl_proc_sig_queue.c
@@ -4992,6 +4992,19 @@ 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;
+
+    ASSERT(msp->ptimer_count == 0);
+
+    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 +5013,8 @@ 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 +5220,7 @@ 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 0798b8ea650b..754630fd9de4 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 +9038,35 @@ 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) {
+            Eterm res;
+            res = erts_proc_sig_send_rpc_request(BIF_P,
+                                                 BIF_ARG_1,
+                                                 0, /* no reply */
+                                                 sched_pause_proc_timer,
+                                                 NULL);
+            if (is_non_value(res)) {
+                goto noproc;
             }
         }
     }
 
+    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 +9081,43 @@ 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) {
@@ -9078,18 +9128,56 @@ 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(prev_suspend_count >= 0);
 
-    ASSERT((mstate & ERTS_MSUSPEND_STATE_COUNTER_MASK) >= 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 (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);
     }
 
+    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);
+        }
+    }
+
     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 9680eb5836fd..4d884ec49a76 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 +57,10 @@
          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_needs_balanced_resume_procs/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,
@@ -131,6 +136,7 @@ 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},
@@ -185,6 +191,11 @@ 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_needs_balanced_resume_procs]},
      {otp_7738, [],
       [otp_7738_waiting, otp_7738_suspended,
        otp_7738_resume]},
@@ -1775,6 +1786,144 @@ 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_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.
+
 %% Tests erlang:bump_reductions/1.
 bump_reductions(Config) when is_list(Config) ->
     erlang:garbage_collect(),
@@ -3139,7 +3288,7 @@ 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 aed9bed6838349c5fb5c2d61bf304db0043e8170..7f3e5241be2fe1bd147e95cdbe1815030d3de495 100644
GIT binary patch
delta 18578
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diff --git a/erts/preloaded/ebin/erts_internal.beam b/erts/preloaded/ebin/erts_internal.beam
index 928de46229dfe8b2929154d4f9eb60142827861f..26e3dffa64b6bbbc308c3ccf56326a52b2c44863 100644
GIT binary patch
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delta 193
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diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 3c950c0a2f53..c6d850833b02 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -467,7 +467,7 @@ A list of binaries. This datatype is useful to use together with
 -export([process_flag/3, process_info/1, processes/0, purge_module/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]).
@@ -5471,6 +5471,21 @@ 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 #{ group => 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
@@ -5479,6 +5494,11 @@ 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.
@@ -5491,14 +5511,25 @@ 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 """
@@ -5850,6 +5881,11 @@ 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
@@ -5896,7 +5932,8 @@ 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) ->
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index e0aaf5ee6af8..10e6204a041c 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -837,7 +837,8 @@ 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).