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-rw-r--r--src/buildstream/_scheduler/jobs/job.py17
1 files changed, 12 insertions, 5 deletions
diff --git a/src/buildstream/_scheduler/jobs/job.py b/src/buildstream/_scheduler/jobs/job.py
index 92559e9f7..88156f3bf 100644
--- a/src/buildstream/_scheduler/jobs/job.py
+++ b/src/buildstream/_scheduler/jobs/job.py
@@ -349,7 +349,8 @@ class Job():
#
# Args:
# message_type (str): A string to identify the message type
- # message (any): A simple serializable object
+ # message (any): A simple object (must be pickle-able, i.e. strings,
+ # lists, dicts, numbers, but not Element instances).
#
# Returns:
# (bool): Should return a truthy value if message_type is handled.
@@ -595,7 +596,9 @@ class ChildJob():
#
# Args:
# message_type (str): The type of message to send.
- # message_data (any): A (simple!) object to be sent to the parent Job.
+ # message_data (any): A simple object (must be pickle-able, i.e.
+ # strings, lists, dicts, numbers, but not Element
+ # instances). This is sent to the parent Job.
#
def send_message(self, message_type, message_data):
self._queue.put(_Envelope(message_type, message_data))
@@ -610,8 +613,10 @@ class ChildJob():
# the job's task.
#
# Returns:
- # (any): A (simple!) object to be returned to the parent Job running
- # in the main process. This is taken as the result of the Job.
+ # (any): A simple object (must be pickle-able, i.e. strings, lists,
+ # dicts, numbers, but not Element instances). It is returned to
+ # the parent Job running in the main process. This is taken as
+ # the result of the Job.
#
def child_process(self):
raise ImplError("ChildJob '{kind}' does not implement child_process()"
@@ -768,7 +773,9 @@ class ChildJob():
# Sends the serialized result to the main process through the message queue
#
# Args:
- # result (object): A simple serializable object, or None
+ # result (any): None, or a simple object (must be pickle-able, i.e.
+ # strings, lists, dicts, numbers, but not Element
+ # instances).
#
# Note: If None is passed here, nothing needs to be sent, the
# result member in the parent process will simply remain None.