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"""
Test "print object" where another thread blocks the print object from making progress.
"""
from __future__ import print_function
import use_lldb_suite
import os, time
import lldb
from lldbtest import *
@skipUnlessDarwin
class PrintObjTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# My source program.
self.source = "blocked.m"
# Find the line numbers to break at.
self.line = line_number(self.source, '// Set a breakpoint here.')
def test_print_obj(self):
"""
Test "print object" where another thread blocks the print object from making progress.
Set a breakpoint on the line in my_pthread_routine. Then switch threads
to the main thread, and do print the lock_me object. Since that will
try to get the lock already gotten by my_pthread_routime thread, it will
have to switch to running all threads, and that should then succeed.
"""
d = {'EXE': 'b.out'}
self.build(dictionary=d)
self.setTearDownCleanup(dictionary=d)
exe = os.path.join(os.getcwd(), 'b.out')
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
self.assertTrue(breakpoint, VALID_BREAKPOINT)
self.runCmd("breakpoint list")
# Launch the process, and do not stop at the entry point.
process = target.LaunchSimple (None, None, self.get_process_working_directory())
self.runCmd("thread backtrace all")
# Let's get the current stopped thread. We'd like to switch to the
# other thread to issue our 'po lock_me' command.
import lldbutil
this_thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
self.assertTrue(this_thread)
# Find the other thread. The iteration protocol of SBProcess and the
# rich comparison methods (__eq__/__ne__) of SBThread come in handy.
other_thread = None
for t in process:
if t != this_thread:
other_thread = t
break
# Set the other thread as the selected thread to issue our 'po' command.other
self.assertTrue(other_thread)
process.SetSelectedThread(other_thread)
if self.TraceOn():
print("selected thread:" + lldbutil.get_description(other_thread))
self.runCmd("thread backtrace")
# We want to traverse the frame to the one corresponding to blocked.m to
# issue our 'po lock_me' command.
depth = other_thread.GetNumFrames()
for i in range(depth):
frame = other_thread.GetFrameAtIndex(i)
name = frame.GetFunctionName()
if name == 'main':
other_thread.SetSelectedFrame(i)
if self.TraceOn():
print("selected frame:" + lldbutil.get_description(frame))
break
self.expect("po lock_me", OBJECT_PRINTED_CORRECTLY,
substrs = ['I am pretty special.'])
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