main/utils: Simplify the FreeBSD ast_get_tid() handling

FreeBSD has had kernel threads for 20+ years.

(cherry picked from commit 75dc596843)

configure

@@ -18847,20 +18847,6 @@ rm -f core conftest.err conftest.$ac_objext \
 #)
 #fi
 
-# for FreeBSD thr_self
-for ac_header in sys/thr.h
-do :
-  ac_fn_c_check_header_mongrel "$LINENO" "sys/thr.h" "ac_cv_header_sys_thr_h" "$ac_includes_default"
-if test "x$ac_cv_header_sys_thr_h" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_SYS_THR_H 1
-_ACEOF
-
-fi
-
-done
-
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for compiler sync operations" >&5
 $as_echo_n "checking for compiler sync operations... " >&6; }
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext

configure.ac

@@ -1181,9 +1181,6 @@ AC_LINK_IFELSE(
 #)
 #fi
 
-# for FreeBSD thr_self
-AC_CHECK_HEADERS([sys/thr.h])
-
 AC_MSG_CHECKING(for compiler sync operations)
 AC_LINK_IFELSE(
 [AC_LANG_PROGRAM([], [int foo1; int foo2 = __sync_fetch_and_add(&foo1, 1);])],

include/asterisk/autoconfig.h.in

@@ -1192,9 +1192,6 @@
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #undef HAVE_SYS_STAT_H
 
-/* Define to 1 if you have the <sys/thr.h> header file. */
-#undef HAVE_SYS_THR_H
-
 /* Define to 1 if you have the <sys/time.h> header file. */
 #undef HAVE_SYS_TIME_H
 

main/utils.c

@@ -36,10 +36,10 @@
 #include <unistd.h>
 #if defined(__APPLE__)
 #include <mach/mach.h>
+#elif defined(__FreeBSD__)
+#include <sys/thr.h>
 #elif defined(__NetBSD__)
 #include <lwp.h>
-#elif defined(HAVE_SYS_THR_H)
-#include <sys/thr.h>
 #endif
 
 #include "asterisk/network.h"
@@ -2757,9 +2757,9 @@ int ast_get_tid(void)
 #elif defined(__APPLE__)
 	ret = mach_thread_self();
 	mach_port_deallocate(mach_task_self(), ret);
-#elif defined(__FreeBSD__) && defined(HAVE_SYS_THR_H)
+#elif defined(__FreeBSD__)
 	long lwpid;
-	thr_self(&lwpid); /* available since sys/thr.h creation 2003 */
+	thr_self(&lwpid);
 	ret = lwpid;
 #elif defined(__NetBSD__)
 	ret = _lwp_self();