pythongh-112606: Use pthread_cond_timedwait_relative_np() in parking_…

…lot.c when available (python#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.

Python/parking_lot.c

@@ -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);

configure.ac

@@ -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 \

pyconfig.h.in

@@ -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