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gh-112606: Use pthread_cond_timedwait_relative_np() in parking_lot.c when available (#112616) 

Add a configure define for HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE_NP and
replaces pthread_cond_timedwait() with pthread_cond_timedwait_relative_np()
for relative time when supported in semaphore waiting logic.
This commit is contained in:
Matt Prodani 2024-01-30 16:22:17 -05:00 committed by GitHub
parent fda7445ca5
commit e5e186609f
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GPG Key ID: B5690EEEBB952194
4 changed files with 17 additions and 3 deletions
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6
Python/parking_lot.c
View File

@ -158,11 +158,15 @@ _PySemaphore_PlatformWait(_PySemaphore *sema, _PyTime_t timeout)
if (sema->counter == 0) {
if (timeout >= 0) {
struct timespec ts;
#if defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE_NP)
_PyTime_AsTimespec_clamp(timeout, &ts);
err = pthread_cond_timedwait_relative_np(&sema->cond, &sema->mutex, &ts);
#else
_PyTime_t deadline = _PyTime_Add(_PyTime_GetSystemClock(), timeout);
_PyTime_AsTimespec_clamp(deadline, &ts);
err = pthread_cond_timedwait(&sema->cond, &sema->mutex, &ts);
#endif // HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE_NP
}
else {
err = pthread_cond_wait(&sema->cond, &sema->mutex);

6
configure generated vendored
View File

@ -17871,6 +17871,12 @@ if test "x$ac_cv_func_preadv2" = xyes
then :
printf "%s\n" "#define HAVE_PREADV2 1" >>confdefs.h
fi
ac_fn_c_check_func "$LINENO" "pthread_cond_timedwait_relative_np" "ac_cv_func_pthread_cond_timedwait_relative_np"
if test "x$ac_cv_func_pthread_cond_timedwait_relative_np" = xyes
then :
printf "%s\n" "#define HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE_NP 1" >>confdefs.h
fi
ac_fn_c_check_func "$LINENO" "pthread_condattr_setclock" "ac_cv_func_pthread_condattr_setclock"
if test "x$ac_cv_func_pthread_condattr_setclock" = xyes

4
configure.ac
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@ -4796,8 +4796,8 @@ AC_CHECK_FUNCS([ \
mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
pipe2 plock poll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
posix_spawn_file_actions_addclosefrom_np \
pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill ptsname ptsname_r \
pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
pread preadv preadv2 pthread_cond_timedwait_relative_np pthread_condattr_setclock pthread_init \
pthread_kill ptsname ptsname_r pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
sched_setparam sched_setscheduler sem_clockwait sem_getvalue sem_open \
sem_timedwait sem_unlink sendfile setegid seteuid setgid sethostname \

4
pyconfig.h.in
View File

@ -936,6 +936,10 @@
/* Define to 1 if you have the `pthread_condattr_setclock' function. */
#undef HAVE_PTHREAD_CONDATTR_SETCLOCK
/* Define to 1 if you have the `pthread_cond_timedwait_relative_np' function.
*/
#undef HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE_NP
/* Defined for Solaris 2.6 bug in pthread header. */
#undef HAVE_PTHREAD_DESTRUCTOR