deadlock.Deadlock Class Reference

Inheritance diagram for deadlock.Deadlock:

Public Member Functions
def	__init__ (self)
def	invoke (self, arg, from_tty)

Detailed Description

Detects deadlocks

Definition at line 397 of file deadlock.py.

Constructor & Destructor Documentation

def deadlock.Deadlock.__init__

(

self

)

Definition at line 400 of file deadlock.py.

    def __init__(self):
        super(Deadlock, self).__init__('deadlock', gdb.COMMAND_NONE)

Member Function Documentation

def deadlock.Deadlock.invoke	(		self,
			arg,
			from_tty
	)

Prints the threads and mutexes in a deadlock, if it exists.

Definition at line 403 of file deadlock.py.

References deadlock.find_cycle(), deadlock.get_thread_info(), and deadlock.print_cycle().

    def invoke(self, arg, from_tty):
        '''Prints the threads and mutexes in a deadlock, if it exists.'''
        lwp_to_thread_id, blocked_threads = get_thread_info()

        # Nodes represent threads. Edge (A,B) exists if thread A
        # is waiting on a mutex held by thread B.
        graph = DiGraph()

        # Go through all the blocked threads and see which threads
        # they are blocked on, and build the thread wait graph.
        for thread_lwp, mutex_type in blocked_threads.items():
            get_owner_and_address_func = \
                MutexType.get_mutex_owner_and_address_func_for_type(mutex_type)
            if not get_owner_and_address_func:
                continue
            mutex_owner_lwp, mutex_address = get_owner_and_address_func(
                lwp_to_thread_id, thread_lwp
            )
            if mutex_owner_lwp and mutex_address:
                graph.add_edge(
                    thread_lwp,
                    mutex_owner_lwp,
                    mutex=mutex_address,
                    mutex_type=mutex_type
                )

        # A deadlock exists if there is a cycle in the graph.
        cycle = find_cycle(graph)
        if cycle:
            print('Found deadlock!')
            print_cycle(graph, lwp_to_thread_id, cycle)
        else:
            print(
                'No deadlock detected. '
                'Do you have debug symbols installed?'
            )

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The documentation for this class was generated from the following file:

• proxygen/folly/folly/experimental/gdb/deadlock.py