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"""
Utility to support asynchronously signaling the current process.
"""
from __future__ import absolute_import
import signal
import sys
import traceback
from . import reportfile
def register(logger, suites):
"""
Registers a signal handler for the SIGUSR1 signal.
"""
def _handle_sigusr1(signum, frame):
"""
Signal handler that will dump the stacks of all threads and
then write out the report file.
"""
_dump_stacks(logger)
reportfile.write(suites)
try:
signal.signal(signal.SIGUSR1, _handle_sigusr1)
except AttributeError:
logger.warn("Cannot catch signals on Windows")
def _dump_stacks(logger):
"""
Signal handler that will dump the stacks of all threads.
"""
header_msg = "Dumping stacks due to SIGUSR1 signal"
sb = []
sb.append(header_msg)
frames = sys._current_frames()
sb.append("Total threads: %d" % (len(frames)))
sb.append("")
for thread_id in frames:
stack = frames[thread_id]
sb.append("Thread %d:" % (thread_id))
sb.append("".join(traceback.format_stack(stack)))
logger.info("\n".join(sb))
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