Refrain from inlining core services, so that interposing on them via
dynamic linking tricks is made easier.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
evl_get_current() contains implementation details which are definitely
not part of the API and the way this works should not be exposed.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Since ABI 23, the core provides the new observable element, which
enables the observer design pattern. Any EVL thread is in and of
itself an observable which can be monitored for events too.
As a by-product, the poll interface can now be given a user-defined
opaque data when subscribing file descriptors to poll elements, which
the core passes back on return to evl_poll().
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Open-coding oob_ioctl() calls to set/clear mode bits in apps is
unhandy and fairly ugly. Let's provide sanctioned services for these
requests, namely evl_set_thread_mode() and evl_clear_thread_mode()
respectively.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Starting with ABI 22, we can ask for the core to unblock a thread from
a wait state, which may include forcing it out of any real-time
scheduling class by demoting it to SCHED_WEAK in the same move.
Export evl_unblock_thread() and evl_demote_thread() as the
corresponding wrappers.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Since core ABI 21, users can decide whether a new element should be
made public or private depending on the value of clone flags added to
the new long form of all element creation calls, i.e. evl_create_*().
All evl_new_*() calls become a shorthand for their respective long
form with reasonable default arguments, including private visibility.
As a shorthand, libevl also interprets a slash character leading the
name argument passed to these services as an implicit request for
creating a public element. In other words, this is the same as passing
EVL_CLONE_PUBLIC in the clone flags.
A public element appears as a cdev in the /dev/evl hierarchy, which
means that it is visible to other processes, which may share it. On
the contrary, a private element is only known from the process
creating it, although it does appear in the /sysfs hierarchy
regardless.
e.g.:
efd = evl_attach_self("/visible-thread");
total 0
crw-rw---- 1 root root 248, 1 Apr 17 11:59 clone
crw-rw---- 1 root root 246, 0 Apr 17 11:59 visible-thread
or,
efd = evl_attach_self("private-thread");
total 0
crw-rw---- 1 root root 248, 1 Apr 17 11:59 clone
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
sched_priority is implemented as a macro by glibc which serves as a
wrapper to the real attribute field in schedparam. Some architectures
may use this trick to hide the actual identifier from the user code,
so make sure to always pull <sched.h> before referencing
sched_priority in uapi/ headers, so that such wrapping also happens
when struct evl_sched_attrs is defined.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Philippe Gerum