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[GR-16581][GR-28401][GR-28403][GR-28404][GR-28407] Threading with GIL
PullRequest: graalpython/1501
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‎CHANGELOG.md

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@@ -5,6 +5,7 @@ language runtime. The main focus is on user-observable behavior of the engine.
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## Version 21.1.0
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* Support multi-threading with a global interpreter lock by default.
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* Added SSL/TLS support (the `ssl` module)
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## Version 21.1.0

‎docs/contributor/IMPLEMENTATION_DETAILS.md

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* `P.patch`
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The same applies to `*.dir` files, and the search is independent of the search
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for the `*.patch` file, i.e., multiple versions of `*.patch` may share one `*.dir`.
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for the `*.patch` file, i.e., multiple versions of `*.patch` may share one `*.dir`.
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## The GIL
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We always run with a GIL, because C extensions in CPython expect to do so and
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are usually not written to be reentrant. The reason to always have the GIL
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enabled is that when using Python, at least Sulong/LLVM is always available in
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the same context and we cannot know if someone may be using that (or another
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polyglot language or the Java host interop) to start additional threads that
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could call back into Python. This could legitimately happen in C extensions when
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the C extension authors use knowledge of how CPython works to do something
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GIL-less in a C thread that is fine to do on CPython's data structures, but not
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for ours.
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Suppose we were running GIL-less until a second thread appears. There is now two
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options: the second thread immediately takes the GIL, but both threads might be
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executing in parallel for a little while before the first thread gets to the
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next safepoint where they try to release and re-acquire the GIL. Option two is
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that we block the second thread on some other semaphore until the first thread
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has acquired the GIL. This scenario may deadlock if the first thread is
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suspended in a blocking syscall. This could be a legitimate use case when
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e.g. one thread is supposed to block on a `select` call that the other thread
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would unblock by operating on the selected resource. Now the second thread
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cannot start to run because it is waiting for the first thread to acquire the
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GIL. To get around this potential deadlock, we would have to "remember" around
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blocking calls that the first thread would have released the GIL before and
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re-acquired it after that point. Since this is equivalent to just releasing and
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re-acquiring the GIL, we might as well always do that.
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The implication of this is that we may have to acquire and release the GIL
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around all library messages that may be invoked without already holding the
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GIL. The pattern here is, around every one of those messages:
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```
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@ExportMessage xxx(..., @Cached GilNode gil) {
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boolean mustRelease = gil.acquire();
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try {
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...
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} finally {
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gil.release(mustRelease);
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}
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}
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```
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The `GilNode` when used in this pattern ensures that we only release the GIL if
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we acquired it before. The `GilNode` internally uses profiles to ensure that if
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we are always running single threaded or always own the GIL already when we get
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to a specific message we never emit a boundary call to lock and unlock the
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GIL. This implies that we may deopt in some places if, after compiling some
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code, we later start a second thread.

‎graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/module/ThreadPoolTests.java

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import java.io.ByteArrayOutputStream;
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import java.io.PrintStream;
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import java.util.Collections;
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import java.util.HashMap;
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import org.junit.Test;
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"print(res)\n";
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final ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
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final PrintStream printStream = new PrintStream(byteArray);
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PythonTests.runScript(Collections.singletonMap("python.WithThread", "true"), new String[0], source, printStream, System.err, () -> PythonTests.closeContext());
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PythonTests.runScript(new HashMap<>(), new String[0], source, printStream, System.err, () -> PythonTests.closeContext());
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String result = byteArray.toString().replaceAll("\r\n", "\n");
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assertEquals("[True, True, True, True, True, True, True, True, True, True]\n", result);
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}

‎graalpython/com.oracle.graal.python.test/src/tests/cpyext/test_memoryview.py

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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import sys
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import time
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import gc
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import itertools
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import sys
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from . import CPyExtTestCase, CPyExtFunction, CPyExtType, unhandled_error_compare_with_message, unhandled_error_compare
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__dir__ = __file__.rpartition("/")[0]
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indices = (-2, 2, 10)
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assert mv2[3] == 126
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mv2.release()
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assert mv3[2] == 126
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del mv1
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del mv3
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for i in range(120):
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gc.collect()
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if obj.get_bufcount() == 0:
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break
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time.sleep(1)
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mv1.release()
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mv3.release()
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assert obj.get_bufcount() == 0

‎graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_support.txt

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*graalpython.lib-python.3.test.test_support.TestSupport.test_check_syntax_error
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*graalpython.lib-python.3.test.test_support.TestSupport.test_detect_api_mismatch
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*graalpython.lib-python.3.test.test_support.TestSupport.test_detect_api_mismatch__ignore
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*graalpython.lib-python.3.test.test_support.TestSupport.test_find_unused_port
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*graalpython.lib-python.3.test.test_support.TestSupport.test_forget
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*graalpython.lib-python.3.test.test_support.TestSupport.test_gc_collect
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*graalpython.lib-python.3.test.test_support.TestSupport.test_get_attribute

‎graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_thread.txt

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*graalpython.lib-python.3.test.test_thread.BarrierTest.test_barrier
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*graalpython.lib-python.3.test.test_thread.LockTests.test_acquire_contended
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*graalpython.lib-python.3.test.test_thread.LockTests.test_acquire_destroy
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*graalpython.lib-python.3.test.test_thread.LockTests.test_acquire_release
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*graalpython.lib-python.3.test.test_thread.LockTests.test_constructor
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*graalpython.lib-python.3.test.test_thread.LockTests.test_different_thread
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*graalpython.lib-python.3.test.test_thread.LockTests.test_locked_repr
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*graalpython.lib-python.3.test.test_thread.LockTests.test_reacquire
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*graalpython.lib-python.3.test.test_thread.LockTests.test_repr
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*graalpython.lib-python.3.test.test_thread.LockTests.test_state_after_timeout
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*graalpython.lib-python.3.test.test_thread.LockTests.test_thread_leak
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*graalpython.lib-python.3.test.test_thread.LockTests.test_timeout
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*graalpython.lib-python.3.test.test_thread.LockTests.test_try_acquire
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*graalpython.lib-python.3.test.test_thread.LockTests.test_try_acquire_contended
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*graalpython.lib-python.3.test.test_thread.LockTests.test_weakref_deleted
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*graalpython.lib-python.3.test.test_thread.LockTests.test_weakref_exists
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*graalpython.lib-python.3.test.test_thread.LockTests.test_with
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*graalpython.lib-python.3.test.test_thread.TestForkInThread.test_forkinthread
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*graalpython.lib-python.3.test.test_thread.ThreadRunningTests.test__count
320
*graalpython.lib-python.3.test.test_thread.ThreadRunningTests.test_nt_and_posix_stack_size
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*graalpython.lib-python.3.test.test_thread.ThreadRunningTests.test_stack_size
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*graalpython.lib-python.3.test.test_thread.ThreadRunningTests.test_starting_threads
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*graalpython.lib-python.3.test.test_thread.ThreadRunningTests.test_unraisable_exception

‎graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_threading.txt

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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_abort
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_abort_and_reset
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_action
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_barrier
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_barrier_10
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_default_timeout
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_reset
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_single_thread
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_timeout
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*graalpython.lib-python.3.test.test_threading.BarrierTests.test_wait_return
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_acquire
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_acquire_contended
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_acquire_destroy
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_acquire_timeout
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_constructor
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_default_value
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_release_unacquired
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_try_acquire
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_try_acquire_contended
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*graalpython.lib-python.3.test.test_threading.BoundedSemaphoreTests.test_with
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test__is_owned
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_acquire_contended
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_acquire_destroy
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_acquire_release
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_constructor
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_different_thread
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_locked_repr
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_reacquire
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_release_save_unacquired
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_release_unacquired
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_repr
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_thread_leak
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_timeout
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_try_acquire
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_try_acquire_contended
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_weakref_deleted
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_weakref_exists
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*graalpython.lib-python.3.test.test_threading.CRLockTests.test_with
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test__is_owned
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_acquire_contended
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_acquire_destroy
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_acquire_release
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_constructor
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_different_thread
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_locked_repr
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_reacquire
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_release_save_unacquired
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_release_unacquired
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_repr
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_thread_leak
51+
*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_timeout
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_try_acquire
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_try_acquire_contended
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_weakref_deleted
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_weakref_exists
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*graalpython.lib-python.3.test.test_threading.ConditionAsRLockTests.test_with
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*graalpython.lib-python.3.test.test_threading.ConditionTests.test_acquire
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*graalpython.lib-python.3.test.test_threading.ConditionTests.test_notify
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*graalpython.lib-python.3.test.test_threading.ConditionTests.test_timeout
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*graalpython.lib-python.3.test.test_threading.ConditionTests.test_unacquired_notify
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*graalpython.lib-python.3.test.test_threading.ConditionTests.test_unacquired_wait
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*graalpython.lib-python.3.test.test_threading.ConditionTests.test_waitfor
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*graalpython.lib-python.3.test.test_threading.ConditionTests.test_waitfor_timeout
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*graalpython.lib-python.3.test.test_threading.EventTests.test_is_set
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*graalpython.lib-python.3.test.test_threading.EventTests.test_notify
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*graalpython.lib-python.3.test.test_threading.EventTests.test_reset_internal_locks
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*graalpython.lib-python.3.test.test_threading.EventTests.test_set_and_clear
68+
*graalpython.lib-python.3.test.test_threading.EventTests.test_timeout
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*graalpython.lib-python.3.test.test_threading.ExceptHookTests.test_custom_excepthook
70+
*graalpython.lib-python.3.test.test_threading.ExceptHookTests.test_custom_excepthook_fail
71+
*graalpython.lib-python.3.test.test_threading.ExceptHookTests.test_excepthook
72+
*graalpython.lib-python.3.test.test_threading.ExceptHookTests.test_excepthook_thread_None
73+
*graalpython.lib-python.3.test.test_threading.ExceptHookTests.test_system_exit
74+
*graalpython.lib-python.3.test.test_threading.LockTests.test_acquire_contended
75+
*graalpython.lib-python.3.test.test_threading.LockTests.test_acquire_destroy
76+
*graalpython.lib-python.3.test.test_threading.LockTests.test_acquire_release
77+
*graalpython.lib-python.3.test.test_threading.LockTests.test_constructor
78+
*graalpython.lib-python.3.test.test_threading.LockTests.test_different_thread
79+
*graalpython.lib-python.3.test.test_threading.LockTests.test_locked_repr
80+
*graalpython.lib-python.3.test.test_threading.LockTests.test_reacquire
81+
*graalpython.lib-python.3.test.test_threading.LockTests.test_repr
82+
*graalpython.lib-python.3.test.test_threading.LockTests.test_state_after_timeout
83+
*graalpython.lib-python.3.test.test_threading.LockTests.test_thread_leak
84+
*graalpython.lib-python.3.test.test_threading.LockTests.test_timeout
85+
*graalpython.lib-python.3.test.test_threading.LockTests.test_try_acquire
86+
*graalpython.lib-python.3.test.test_threading.LockTests.test_try_acquire_contended
87+
*graalpython.lib-python.3.test.test_threading.LockTests.test_weakref_deleted
88+
*graalpython.lib-python.3.test.test_threading.LockTests.test_weakref_exists
89+
*graalpython.lib-python.3.test.test_threading.LockTests.test_with
90+
*graalpython.lib-python.3.test.test_threading.MiscTestCase.test__all__
91+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test__is_owned
92+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_acquire_contended
93+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_acquire_destroy
94+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_acquire_release
95+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_constructor
96+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_different_thread
97+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_locked_repr
98+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_reacquire
99+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_release_save_unacquired
100+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_release_unacquired
101+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_repr
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*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_thread_leak
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*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_timeout
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*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_try_acquire
105+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_try_acquire_contended
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*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_weakref_deleted
107+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_weakref_exists
108+
*graalpython.lib-python.3.test.test_threading.PyRLockTests.test_with
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*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_acquire
110+
*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_acquire_contended
111+
*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_acquire_destroy
112+
*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_acquire_timeout
113+
*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_constructor
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*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_default_value
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*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_release_unacquired
116+
*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_try_acquire
117+
*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_try_acquire_contended
118+
*graalpython.lib-python.3.test.test_threading.SemaphoreTests.test_with
119+
*graalpython.lib-python.3.test.test_threading.SubinterpThreadingTests.test_daemon_threads_fatal_error
120+
*graalpython.lib-python.3.test.test_threading.ThreadJoinOnShutdown.test_2_join_in_forked_process
121+
*graalpython.lib-python.3.test.test_threading.ThreadJoinOnShutdown.test_3_join_in_forked_from_thread
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*graalpython.lib-python.3.test.test_threading.ThreadJoinOnShutdown.test_4_daemon_threads
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*graalpython.lib-python.3.test.test_threading.ThreadJoinOnShutdown.test_clear_threads_states_after_fork
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*graalpython.lib-python.3.test.test_threading.ThreadJoinOnShutdown.test_reinit_tls_after_fork
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_BoundedSemaphore_limit
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_PyThreadState_SetAsyncExc
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_daemon_param
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_dummy_thread_after_fork
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_enumerate_after_join
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_finalization_shutdown
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_finalize_runnning_thread
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_foreign_thread
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_frame_tstate_tracing
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_ident_of_no_threading_threads
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_is_alive_after_fork
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_join_nondaemon_on_shutdown
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_limbo_cleanup
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_main_thread
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_main_thread_after_fork
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_main_thread_after_fork_from_nonmain_thread
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_main_thread_during_shutdown
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_no_refcycle_through_target
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_old_threading_api
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_repr_daemon
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_repr_stopped
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_shutdown_locks
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_tstate_lock
148+
*graalpython.lib-python.3.test.test_threading.ThreadTests.test_various_ops
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_various_ops_large_stack
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*graalpython.lib-python.3.test.test_threading.ThreadTests.test_various_ops_small_stack
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_bare_raise_in_brand_new_thread
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_daemonize_active_thread
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_joining_current_thread
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_joining_inactive_thread
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_print_exception
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_print_exception_stderr_is_none_1
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_print_exception_stderr_is_none_2
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_recursion_limit
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*graalpython.lib-python.3.test.test_threading.ThreadingExceptionTests.test_start_thread_again
160+
*graalpython.lib-python.3.test.test_threading.TimerTests.test_init_immutable_default_args

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