[PATCH v2 0/1] MR8916: ntdll: Switch to CLOCK_BOOTTIME for monotonic counters on Linux.

[Marc-Aurel Zent (＠mzent)]

This now accounts for system suspend periods on Linux, similar to how native win32 ticks work.

On macOS `mach_continuous_time` already does so.

~~On BSDs (and other POSIX compliant operating systems) `CLOCK_MONOTONIC` likewise includes suspend time. However they also provide a `CLOCK_BOOTTIME`, which does *not* include suspend time, hence the added `__linux__` check there.~~

See https://lkml.org/lkml/2020/5/8/1707

--
  v2: ntdll: Switch to CLOCK_BOOTTIME for monotonic counters when available.

https://gitlab.winehq.org/wine/wine/-/merge_requests/8916

[PATCH v2 1/1] ntdll: Switch to CLOCK_BOOTTIME for monotonic counters when available.

[Marc-Aurel Zent]

From: Marc-Aurel Zent

This now accounts for system suspend periods.

See https://lkml.org/lkml/2020/5/8/1707
---
 dlls/ntdll/unix/sync.c | 4 ++--
 server/request.c       | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/dlls/ntdll/unix/sync.c b/dlls/ntdll/unix/sync.c
index acdb7b3d9f8..a352e814fde 100644
--- a/dlls/ntdll/unix/sync.c
+++ b/dlls/ntdll/unix/sync.c
@@ -94,8 +94,8 @@ static inline ULONGLONG monotonic_counter(void)
     return mach_continuous_time() * timebase.numer / timebase.denom / 100;
 #elif defined(HAVE_CLOCK_GETTIME)
     struct timespec ts;
-#ifdef CLOCK_MONOTONIC_RAW
-    if (!clock_gettime( CLOCK_MONOTONIC_RAW, &ts ))
+#ifdef CLOCK_BOOTTIME
+    if (!clock_gettime( CLOCK_BOOTTIME, &ts ))
         return ts.tv_sec * (ULONGLONG)TICKSPERSEC + ts.tv_nsec / 100;
 #endif
     if (!clock_gettime( CLOCK_MONOTONIC, &ts ))
diff --git a/server/request.c b/server/request.c
index 835ea30cec3..432a5918892 100644
--- a/server/request.c
+++ b/server/request.c
@@ -515,8 +515,8 @@ timeout_t monotonic_counter(void)
     return mach_continuous_time() * timebase.numer / timebase.denom / 100;
 #elif defined(HAVE_CLOCK_GETTIME)
     struct timespec ts;
-#ifdef CLOCK_MONOTONIC_RAW
-    if (!clock_gettime( CLOCK_MONOTONIC_RAW, &ts ))
+#ifdef CLOCK_BOOTTIME
+    if (!clock_gettime( CLOCK_BOOTTIME, &ts ))
         return (timeout_t)ts.tv_sec * TICKS_PER_SEC + ts.tv_nsec / 100;
 #endif
     if (!clock_gettime( CLOCK_MONOTONIC, &ts ))

[Brendan Shanks (＠bshanks)]

On Thu Sep 11 21:50:22 2025 +0000, Marc-Aurel Zent wrote:
> Ah I was looking at https://man.freebsd.org/cgi/man.cgi?query=clock_gettime
> Well it seems they implemented things differently to what they intended
> to do, and given that previous versions did not include suspend and now
> `CLOCK_BOOTTIME` behaves identical to `CLOCK_MONOTONIC` (both including
> suspend) that `__linux__` check is really unnecessary there now.
> I couldn't find any other BSD with `CLOCK_BOOTTIME` so I will just
> remove it.

If it helps, I found that commit that changed the `clock_gettime` man page: https://github.com/freebsd/freebsd-src/commit/de1e91339b17171e020029e1d49f36...