wait_for_thread_etc: expose as syscall/make public.

* This will be needed for the following commit that implements
  `pthread_tryjoin_np` and `pthread_timedjoin_np`.

Change-Id: Idccb1aa588d6d10825294d14925d9bd046b65f19
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5098
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

headers/os/kernel/OS.h

@@ -341,6 +341,8 @@ extern status_t		rename_thread(thread_id thread, const char *newName);
 extern status_t		set_thread_priority(thread_id thread, int32 newPriority);
 extern void			exit_thread(status_t status);
 extern status_t		wait_for_thread(thread_id thread, status_t *returnValue);
+extern status_t		wait_for_thread_etc(thread_id id, uint32 flags, bigtime_t timeout,
+						status_t *_returnCode);
 extern status_t		on_exit_thread(void (*callback)(void *), void *data);
 
 extern thread_id 	find_thread(const char *name);

headers/private/kernel/thread.h

@@ -127,8 +127,6 @@ thread_id thread_create_thread(const ThreadCreationAttributes& attributes,
 
 thread_id spawn_kernel_thread_etc(thread_func, const char *name, int32 priority,
 	void *args, team_id team);
-status_t wait_for_thread_etc(thread_id id, uint32 flags, bigtime_t timeout,
-	status_t *_returnCode);
 
 status_t select_thread(int32 object, struct select_info *info, bool kernel);
 status_t deselect_thread(int32 object, struct select_info *info, bool kernel);
@@ -147,6 +145,8 @@ status_t _user_resume_thread(thread_id thread);
 status_t _user_rename_thread(thread_id thread, const char *name);
 thread_id _user_spawn_thread(struct thread_creation_attributes* attributes);
 status_t _user_wait_for_thread(thread_id id, status_t *_returnCode);
+status_t _user_wait_for_thread_etc(thread_id id, uint32 flags, bigtime_t timeout,
+	status_t *_returnCode);
 status_t _user_snooze_etc(bigtime_t timeout, int timebase, uint32 flags,
 	bigtime_t* _remainingTime);
 status_t _user_kill_thread(thread_id thread);

headers/private/system/syscalls.h

@@ -167,6 +167,8 @@ extern status_t		_kern_cancel_thread(thread_id threadID,
 extern void			_kern_thread_yield(void);
 extern status_t		_kern_wait_for_thread(thread_id thread,
 						status_t *_returnCode);
+extern status_t		_kern_wait_for_thread_etc(thread_id thread, uint32 flags,
+						bigtime_t timeout, status_t *_returnCode);
 extern bool			_kern_has_data(thread_id thread);
 extern status_t		_kern_send_data(thread_id thread, int32 code,
 						const void *buffer, size_t bufferSize);

src/system/kernel/thread.cpp

@@ -3676,6 +3676,28 @@ _user_wait_for_thread(thread_id id, status_t *userReturnCode)
 }
 
 
+status_t
+_user_wait_for_thread_etc(thread_id id, uint32 flags, bigtime_t timeout, status_t *userReturnCode)
+{
+	status_t returnCode;
+	status_t status;
+
+	if (userReturnCode != NULL && !IS_USER_ADDRESS(userReturnCode))
+		return B_BAD_ADDRESS;
+
+	syscall_restart_handle_timeout_pre(flags, timeout);
+
+	status = wait_for_thread_etc(id, flags | B_CAN_INTERRUPT, timeout, &returnCode);
+
+	if (status == B_OK && userReturnCode != NULL
+		&& user_memcpy(userReturnCode, &returnCode, sizeof(status_t)) < B_OK) {
+		return B_BAD_ADDRESS;
+	}
+
+	return syscall_restart_handle_timeout_post(status, timeout);
+}
+
+
 bool
 _user_has_data(thread_id thread)
 {

src/system/libroot/os/thread.c

@@ -183,6 +183,13 @@ wait_for_thread(thread_id thread, status_t *_returnCode)
 }
 
 
+status_t
+wait_for_thread_etc(thread_id thread, uint32 flags, bigtime_t timeout, status_t *_returnCode)
+{
+	return _kern_wait_for_thread_etc(thread, flags, timeout, _returnCode);
+}
+
+
 status_t
 on_exit_thread(void (*callback)(void *), void *data)
 {

src/system/libroot/stubbed/libroot_stubs.c

@@ -2894,6 +2894,7 @@ void wait_for_debugger() {}
 void wait_for_objects() {}
 void wait_for_objects_etc() {}
 void wait_for_thread() {}
+void wait_for_thread_etc() {}
 void waitid() {}
 void waitpid() {}
 void wcpcpy() {}

src/system/libroot/stubbed/libroot_stubs_legacy.c

@@ -2841,6 +2841,7 @@ void wait_for_debugger() {}
 void wait_for_objects() {}
 void wait_for_objects_etc() {}
 void wait_for_thread() {}
+void wait_for_thread_etc() {}
 void waitid() {}
 void waitpid() {}
 void wcpcpy() {}