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Kernel: Disable big process lock for sys$clock_gettime()

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This syscall doesn't touch any intra-process shared resources and
reads the time via the atomic TimeManagement::current_time, so it
doesn't need to hold any lock.
This commit is contained in:
Idan Horowitz 2021-08-06 14:49:52 +03:00 • committed by Andreas Kling
parent 1a08694dfc
commit fbd848e6eb
2 changed files with 2 additions and 2 deletions
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2
Kernel/API/Syscall.h
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@ -157,7 +157,7 @@ enum class NeedsBigProcessLock {
S(getrandom, NeedsBigProcessLock::No) \ S(getrandom, NeedsBigProcessLock::No) \
S(getkeymap, NeedsBigProcessLock::No) \ S(getkeymap, NeedsBigProcessLock::No) \
S(setkeymap, NeedsBigProcessLock::Yes) \ S(setkeymap, NeedsBigProcessLock::Yes) \
S(clock_gettime, NeedsBigProcessLock::Yes) \ S(clock_gettime, NeedsBigProcessLock::No) \
S(clock_settime, NeedsBigProcessLock::Yes) \ S(clock_settime, NeedsBigProcessLock::Yes) \
S(clock_nanosleep, NeedsBigProcessLock::Yes) \ S(clock_nanosleep, NeedsBigProcessLock::Yes) \
S(join_thread, NeedsBigProcessLock::Yes) \ S(join_thread, NeedsBigProcessLock::Yes) \

2
Kernel/Syscalls/clock.cpp
View file

@ -12,7 +12,7 @@ namespace Kernel {
KResultOr<FlatPtr> Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts) KResultOr<FlatPtr> Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
{ {
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this); VERIFY_NO_PROCESS_BIG_LOCK(this);
REQUIRE_PROMISE(stdio); REQUIRE_PROMISE(stdio);
if (!TimeManagement::is_valid_clock_id(clock_id)) if (!TimeManagement::is_valid_clock_id(clock_id))