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mach: Add CLOCK_MONOTONIC case in clock_gettime()

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The Mach RPC host_get_uptime64() is implemented. It returns the elapsed time
value since bootup. See

https://git.savannah.gnu.org/cgit/hurd/gnumach.git/commit/?id=fc494bfe3fb6363e1077dc035eb119970d84a9d1

In this patch, the RPC is used to implement the monotonic clock for
mach.

* config.h.in: Add HAVE_HOST_GET_UPTIME64 config entry
* sysdeps/mach/clock_gettime.c: Add CLOCK_MONOTONIC case
* sysdeps/mach/configure: Check the existence of host_get_uptime64 RPC
* sysdeps/mach/configure.ac: Check the existence of host_get_uptime64 RPC

Message-ID: <20250106043907.1046-1-zhmingluo@163.com>
This commit is contained in:
Zhaoming Luo 2025-01-06 12:39:07 +08:00 committed by Samuel Thibault
parent 73b854e955
commit 3782ffaf3e
4 changed files with 59 additions and 0 deletions
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3
config.h.in
View File

@ -163,6 +163,9 @@
/* Mach specific: define if the `host_page_size' RPC is available. */
#undef HAVE_HOST_PAGE_SIZE
/* Mach specific: define if the `host_get_uptime64' RPC is available. */
#undef HAVE_HOST_GET_UPTIME64
/* Mach specific: define if the `thread_set_name' RPC is available. */
#undef HAVE_MACH_THREAD_SET_NAME

24
sysdeps/mach/clock_gettime.c
View File

@ -20,6 +20,7 @@
#include <mach.h>
#include <assert.h>
#include <shlib-compat.h>
#include <mach/mig_errors.h>
/* Get the current time of day, putting it into *TS.
Returns 0 on success, -1 on errors. */
@ -31,6 +32,29 @@ __clock_gettime (clockid_t clock_id, struct timespec *ts)
switch (clock_id) {
case CLOCK_MONOTONIC:
/* If HAVE_HOST_GET_UPTIME64 is not defined or not available,
CLOCK_MONOTONIC will be equivalent to CLOCK_REALTIME. */
#ifdef HAVE_HOST_GET_UPTIME64
{
time_value64_t tv;
err = __host_get_uptime64 (__mach_host_self (), &tv);
if (err != MIG_BAD_ID)
{
if (err)
{
__set_errno (err);
return -1;
}
TIME_VALUE64_TO_TIMESPEC (&tv, ts);
return 0;
}
}
/* FALLTHROUGH */
#endif
case CLOCK_REALTIME:
{
/* __host_get_time can only fail if passed an invalid host_t.

30
sysdeps/mach/configure vendored
View File

@ -461,6 +461,36 @@ if test $libc_cv_mach_rpc_host_page_size = yes; then
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for host_get_uptime64 in mach_host.defs" >&5
printf %s "checking for host_get_uptime64 in mach_host.defs... " >&6; }
if test ${libc_cv_mach_rpc_host_get_uptime64+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <mach/mach_host.defs>
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
$EGREP_TRADITIONAL "host_get_uptime64" >/dev/null 2>&1
then :
libc_cv_mach_rpc_host_get_uptime64=yes
else case e in #(
e) libc_cv_mach_rpc_host_get_uptime64=no ;;
esac
fi
rm -rf conftest*
;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_mach_rpc_host_get_uptime64" >&5
printf "%s\n" "$libc_cv_mach_rpc_host_get_uptime64" >&6; }
if test $libc_cv_mach_rpc_host_get_uptime64 = yes; then
printf "%s\n" "#define HAVE_HOST_GET_UPTIME64 1" >>confdefs.h
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for thread_set_name in gnumach.defs" >&5
printf %s "checking for thread_set_name in gnumach.defs... " >&6; }
if test ${libc_cv_mach_rpc_thread_set_name+y}

2
sysdeps/mach/configure.ac
View File

@ -92,6 +92,8 @@ fi
mach_RPC_CHECK(mach_host.defs, host_page_size,
HAVE_HOST_PAGE_SIZE)
mach_RPC_CHECK(mach_host.defs, host_get_uptime64,
HAVE_HOST_GET_UPTIME64)
mach_RPC_CHECK(gnumach.defs, thread_set_name,
HAVE_MACH_THREAD_SET_NAME)
mach_RPC_CHECK(gnumach.defs, thread_get_name,