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Kernel: Disable big process lock for sys$gettimeofday

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This syscall doesn't touch any intra-process shared resources and only
accesses the time via the atomic TimeManagement::now so there's no need
to hold the big lock.
This commit is contained in:
Idan Horowitz 2021-08-06 14:58:28 +03:00 • committed by Andreas Kling
parent 3ba2449058
commit d40038a04f
2 changed files with 2 additions and 2 deletions
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2
Kernel/API/Syscall.h
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@ -64,7 +64,7 @@ enum class NeedsBigProcessLock {
S(munmap, NeedsBigProcessLock::Yes) \ S(munmap, NeedsBigProcessLock::Yes) \
S(get_dir_entries, NeedsBigProcessLock::Yes) \ S(get_dir_entries, NeedsBigProcessLock::Yes) \
S(getcwd, NeedsBigProcessLock::Yes) \ S(getcwd, NeedsBigProcessLock::Yes) \
S(gettimeofday, NeedsBigProcessLock::Yes) \ S(gettimeofday, NeedsBigProcessLock::No) \
S(gethostname, NeedsBigProcessLock::No) \ S(gethostname, NeedsBigProcessLock::No) \
S(sethostname, NeedsBigProcessLock::No) \ S(sethostname, NeedsBigProcessLock::No) \
S(chdir, NeedsBigProcessLock::Yes) \ S(chdir, NeedsBigProcessLock::Yes) \

2
Kernel/Syscalls/clock.cpp
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@ -118,7 +118,7 @@ KResultOr<FlatPtr> Process::sys$adjtime(Userspace<const timeval*> user_delta, Us
KResultOr<FlatPtr> Process::sys$gettimeofday(Userspace<timeval*> user_tv) KResultOr<FlatPtr> Process::sys$gettimeofday(Userspace<timeval*> user_tv)
{ {
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this); VERIFY_NO_PROCESS_BIG_LOCK(this);
REQUIRE_PROMISE(stdio); REQUIRE_PROMISE(stdio);
auto tv = kgettimeofday().to_timeval(); auto tv = kgettimeofday().to_timeval();
if (!copy_to_user(user_tv, &tv)) if (!copy_to_user(user_tv, &tv))