From 6c02c493f104e866b8790df978a11972966a8d0a Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 3 Apr 2023 16:35:21 +0200
Subject: [PATCH] Kernel: Mark sys$sigtimedwait as not needing the big lock

Yet another syscall that only messes with the current thread.
---
 Kernel/API/Syscall.h          | 2 +-
 Kernel/Syscalls/sigaction.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h
index 65c8957bf8..20887f17c0 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -180,7 +180,7 @@ enum class NeedsBigProcessLock {
     S(sigprocmask, NeedsBigProcessLock::No)                 \
     S(sigreturn, NeedsBigProcessLock::No)                   \
     S(sigsuspend, NeedsBigProcessLock::No)                  \
-    S(sigtimedwait, NeedsBigProcessLock::Yes)               \
+    S(sigtimedwait, NeedsBigProcessLock::No)                \
     S(socket, NeedsBigProcessLock::No)                      \
     S(socketpair, NeedsBigProcessLock::No)                  \
     S(stat, NeedsBigProcessLock::No)                        \
diff --git a/Kernel/Syscalls/sigaction.cpp b/Kernel/Syscalls/sigaction.cpp
index 5cf1296721..7071b92978 100644
--- a/Kernel/Syscalls/sigaction.cpp
+++ b/Kernel/Syscalls/sigaction.cpp
@@ -295,7 +295,7 @@ ErrorOr<FlatPtr> Process::sys$sigaltstack(Userspace<stack_t const*> user_ss, Use
 // https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigtimedwait.html
 ErrorOr<FlatPtr> Process::sys$sigtimedwait(Userspace<sigset_t const*> set, Userspace<siginfo_t*> info, Userspace<timespec const*> timeout)
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     TRY(require_promise(Pledge::sigaction));
 
     sigset_t set_value;