SD_EVENT_SOURCE_UNREF(3)     sd_event_source_unref    SD_EVENT_SOURCE_UNREF(3)

NAME
       sd_event_source_unref, sd_event_source_unrefp, sd_event_source_ref,
       sd_event_source_disable_unref, sd_event_source_disable_unrefp -
       Increase or decrease event source reference counters

SYNOPSIS
       #include <systemd/sd-event.h>

       sd_event_source* sd_event_source_unref(sd_event_source *source);

       void sd_event_source_unrefp(sd_event_source **source);

       sd_event_source* sd_event_source_ref(sd_event_source *source);

       sd_event_source*
                                                      sd_event_source_disable_unref(sd_event_source *source);

       void sd_event_source_disable_unrefp(sd_event_source **source);

DESCRIPTION
       sd_event_source_unref() may be used to decrement by one the internal
       reference counter of the event source object specified as source. The
       reference counter is initially set to one, when the event source is
       created with calls such as sd_event_add_io(3) or sd_event_add_time(3).
       When the reference counter reaches zero, the object is detached from
       the event loop object and destroyed.

       sd_event_source_unrefp() is similar to sd_event_source_unref() but
       takes a pointer to a pointer to an sd_event_source object. This call is
       useful in conjunction with GCC's and LLVM's Clean-up Variable
       Attribute[1]. Note that this function is defined as inline function.

       sd_event_source_ref() may be used to increase by one the internal
       reference counter of the event source object specified as source.

       sd_event_source_unref(), sd_bus_creds_unrefp() and sd_bus_creds_ref()
       execute no operation if the passed event source object is NULL.

       Note that event source objects stay alive and may be dispatched as long
       as they have a reference counter greater than zero. In order to drop a
       reference of an event source and make sure the associated event source
       handler function is not called anymore it is recommended to combine a
       call of sd_event_source_unref() with a prior call to
       sd_event_source_set_enabled() with SD_EVENT_OFF or call
       sd_event_source_disable_unref(), see below.

       sd_event_source_disable_unref() combines a call to
       sd_event_source_set_enabled() with SD_EVENT_OFF with
       sd_event_source_unref(). This ensures that the source is disabled
       before the local reference to it is lost. The source parameter is
       allowed to be NULL.

       sd_event_source_disable_unrefp() is similar to
       sd_event_source_unrefp(), but in addition disables the source first.
       This call is useful in conjunction with GCC's and LLVM's Clean-up
       Variable Attribute[1]. Note that this function is defined as inline
       function.

RETURN VALUE
       sd_event_source_unref() and sd_event_source_disable_unref() always
       return NULL.  sd_event_source_ref() always returns the event source
       object passed in.

NOTES
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

SEE ALSO
       sd-event(3), sd_event_add_io(3), sd_event_add_time(3),
       sd_event_add_signal(3), sd_event_add_child(3), sd_event_add_inotify(3),
       sd_event_add_defer(3), sd_event_source_set_enabled(3)

NOTES
        1. Clean-up Variable Attribute
           https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html

systemd 252                                           SD_EVENT_SOURCE_UNREF(3)

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