class Clock:
+ """
+ A CTF clock allows the description of the system's clock topology, as
+ well as the definition of each clock's parameters.
+
+ :class:`Clock` objects must be registered to a :class:`Writer`
+ object (see :meth:`Writer.add_clock`), as well as be registered to
+ a :class:`StreamClass` object (see :attr:`StreamClass.clock`).
+ """
+
def __init__(self, name):
+ """
+ Creates a default CTF clock named *name*.
+
+ :exc:`ValueError` is raised on error.
+ """
+
self._c = nbt._bt_ctf_clock_create(name)
if self._c is None:
@property
def name(self):
"""
- Get the clock's name.
+ Clock name.
+
+ Set this attribute to change the clock's name.
+
+ :exc:`ValueError` is raised on error.
"""
name = nbt._bt_ctf_clock_get_name(self._c)
@property
def description(self):
"""
- Get the clock's description. None if unset.
+ Clock description (string).
+
+ Set this attribute to change the clock's description.
+
+ :exc:`ValueError` is raised on error.
"""
return nbt._bt_ctf_clock_get_description(self._c)
@description.setter
def description(self, desc):
- """
- Set the clock's description. The description appears in the clock's TSDL
- meta-data.
- """
-
ret = nbt._bt_ctf_clock_set_description(self._c, str(desc))
if ret < 0:
@property
def frequency(self):
"""
- Get the clock's frequency (Hz).
+ Clock frequency in Hz (integer).
+
+ Set this attribute to change the clock's frequency.
+
+ :exc:`ValueError` is raised on error.
"""
freq = nbt._bt_ctf_clock_get_frequency(self._c)
@frequency.setter
def frequency(self, freq):
- """
- Set the clock's frequency (Hz).
- """
-
ret = nbt._bt_ctf_clock_set_frequency(self._c, freq)
if ret < 0:
@property
def precision(self):
"""
- Get the clock's precision (in clock ticks).
+ Clock precision in clock ticks (integer).
+
+ Set this attribute to change the clock's precision.
+
+ :exc:`ValueError` is raised on error.
"""
precision = nbt._bt_ctf_clock_get_precision(self._c)
@precision.setter
def precision(self, precision):
- """
- Set the clock's precision (in clock ticks).
- """
-
ret = nbt._bt_ctf_clock_set_precision(self._c, precision)
@property
def offset_seconds(self):
"""
- Get the clock's offset in seconds from POSIX.1 Epoch.
+ Clock offset in seconds since POSIX.1 Epoch (integer).
+
+ Set this attribute to change the clock's offset in seconds.
+
+ :exc:`ValueError` is raised on error.
"""
offset_s = nbt._bt_ctf_clock_get_offset_s(self._c)
@offset_seconds.setter
def offset_seconds(self, offset_s):
- """
- Set the clock's offset in seconds from POSIX.1 Epoch.
- """
-
ret = nbt._bt_ctf_clock_set_offset_s(self._c, offset_s)
if ret < 0:
@property
def offset(self):
"""
- Get the clock's offset in ticks from POSIX.1 Epoch + offset in seconds.
+ Clock offset in ticks since (POSIX.1 Epoch +
+ :attr:`offset_seconds`).
+
+ Set this attribute to change the clock's offset.
+
+ :exc:`ValueError` is raised on error.
"""
offset = nbt._bt_ctf_clock_get_offset(self._c)
@offset.setter
def offset(self, offset):
- """
- Set the clock's offset in ticks from POSIX.1 Epoch + offset in seconds.
- """
-
ret = nbt._bt_ctf_clock_set_offset(self._c, offset)
if ret < 0:
@property
def absolute(self):
"""
- Get a clock's absolute attribute. A clock is absolute if the clock
- is a global reference across the trace's other clocks.
+ ``True`` if this clock is absolute, i.e. if the clock is a
+ global reference across the other clocks of the trace.
+
+ Set this attribute to change the clock's absolute state
+ (boolean).
+
+ :exc:`ValueError` is raised on error.
"""
is_absolute = nbt._bt_ctf_clock_get_is_absolute(self._c)
@absolute.setter
def absolute(self, is_absolute):
- """
- Set a clock's absolute attribute. A clock is absolute if the clock
- is a global reference across the trace's other clocks.
- """
-
ret = nbt._bt_ctf_clock_set_is_absolute(self._c, int(is_absolute))
if ret < 0:
- raise ValueError("Could not set the clock's absolute attribute.")
+ raise ValueError("Could not set the clock absolute attribute.")
@property
def uuid(self):
"""
- Get a clock's UUID (an object of type UUID).
+ Clock UUID (an :class:`uuid.UUID` object).
+
+ Set this attribute to change the clock's UUID.
+
+ :exc:`ValueError` is raised on error.
"""
uuid_list = []
@uuid.setter
def uuid(self, uuid):
- """
- Set a clock's UUID (an object of type UUID).
- """
-
uuid_bytes = uuid.bytes
if len(uuid_bytes) != 16:
@property
def time(self):
"""
- Get the current time in nanoseconds since the clock's origin (offset and
- offset_s attributes).
+ Clock current time; nanoseconds (integer) since clock origin
+ (POSIX.1 Epoch + :attr:`offset_seconds` + :attr:`offset`).
+
+ Set this attribute to change the clock's current time.
+
+ :exc:`ValueError` is raised on error.
"""
time = nbt._bt_ctf_clock_get_time(self._c)
@time.setter
def time(self, time):
- """
- Set the current time in nanoseconds since the clock's origin (offset and
- offset_s attributes). The clock's value will be sampled as events are
- appended to a stream.
- """
-
ret = nbt._bt_ctf_clock_set_time(self._c, time)
if ret < 0:
projects / babeltrace.git / commitdiff
