244 lines
7.4 KiB
Diff
244 lines
7.4 KiB
Diff
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Fedora GDB patches <invalid@email.com>
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Date: Fri, 27 Oct 2017 21:07:50 +0200
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Subject: gdb-python-gil.patch
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;; Fix Python GIL with gdb.execute("continue") (Phil Muldoon, BZ 1116957).
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;;=push
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diff --git a/gdb/doc/python.texi b/gdb/doc/python.texi
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--- a/gdb/doc/python.texi
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+++ b/gdb/doc/python.texi
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@@ -234,6 +234,14 @@ returned as a string. The default is @code{False}, in which case the
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return value is @code{None}. If @var{to_string} is @code{True}, the
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@value{GDBN} virtual terminal will be temporarily set to unlimited width
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and height, and its pagination will be disabled; @pxref{Screen Size}.
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+
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+The @var{release_gil} flag specifies whether @value{GDBN} ought to
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+release the Python GIL before executing the command. This is useful
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+in multi-threaded Python programs where by default the Python
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+interpreter will acquire the GIL and lock other threads from
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+executing. After the command has completed executing in @value{GDBN}
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+the Python GIL is reacquired. This flag must be a boolean value. If
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+omitted, it defaults to @code{False}.
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@end defun
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@findex gdb.breakpoints
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diff --git a/gdb/python/python-internal.h b/gdb/python/python-internal.h
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--- a/gdb/python/python-internal.h
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+++ b/gdb/python/python-internal.h
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@@ -137,6 +137,8 @@ typedef int Py_ssize_t;
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#define PyGILState_Release(ARG) ((void)(ARG))
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#define PyEval_InitThreads()
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#define PyThreadState_Swap(ARG) ((void)(ARG))
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+#define PyEval_SaveThread() ((void)(ARG))
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+#define PyEval_RestoreThread(ARG) ((void)(ARG))
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#define PyEval_ReleaseLock()
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#endif
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diff --git a/gdb/python/python.c b/gdb/python/python.c
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--- a/gdb/python/python.c
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+++ b/gdb/python/python.c
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@@ -544,12 +544,16 @@ execute_gdb_command (PyObject *self, PyObject *args, PyObject *kw)
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{
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const char *arg;
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PyObject *from_tty_obj = NULL, *to_string_obj = NULL;
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- int from_tty, to_string;
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- static const char *keywords[] = { "command", "from_tty", "to_string", NULL };
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+ int from_tty, to_string, release_gil;
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+ static const char *keywords[] = {"command", "from_tty", "to_string", "release_gil", NULL };
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+ PyObject *release_gil_obj = NULL;
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+ /* Initialize it just to avoid a GCC false warning. */
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+ PyThreadState *state = NULL;
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- if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O!O!", keywords, &arg,
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+ if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|O!O!O!", keywords, &arg,
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&PyBool_Type, &from_tty_obj,
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- &PyBool_Type, &to_string_obj))
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+ &PyBool_Type, &to_string_obj,
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+ &PyBool_Type, &release_gil_obj))
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return NULL;
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from_tty = 0;
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@@ -570,6 +574,15 @@ execute_gdb_command (PyObject *self, PyObject *args, PyObject *kw)
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to_string = cmp;
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}
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+ release_gil = 0;
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+ if (release_gil_obj)
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+ {
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+ int cmp = PyObject_IsTrue (release_gil_obj);
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+ if (cmp < 0)
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+ return NULL;
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+ release_gil = cmp;
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+ }
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+
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std::string to_string_res;
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scoped_restore preventer = prevent_dont_repeat ();
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@@ -594,6 +607,13 @@ execute_gdb_command (PyObject *self, PyObject *args, PyObject *kw)
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counted_command_line lines = read_command_lines_1 (reader, 1, nullptr);
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+ /* In the case of long running GDB commands, allow the user to
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+ release the Python GIL acquired by Python. Restore the GIL
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+ after the command has completed before handing back to
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+ Python. */
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+ if (release_gil)
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+ state = PyEval_SaveThread();
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+
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{
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scoped_restore save_async = make_scoped_restore (¤t_ui->async,
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0);
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@@ -612,12 +632,24 @@ execute_gdb_command (PyObject *self, PyObject *args, PyObject *kw)
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execute_control_commands (lines.get (), from_tty);
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}
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+ /* Reacquire the GIL if it was released earlier. */
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+ if (release_gil)
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+ PyEval_RestoreThread (state);
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+
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/* Do any commands attached to breakpoint we stopped at. */
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bpstat_do_actions ();
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}
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CATCH (except, RETURN_MASK_ALL)
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{
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- GDB_PY_HANDLE_EXCEPTION (except);
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+ if (except.reason < 0)
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+ {
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+ /* Reacquire the GIL if it was released earlier. */
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+ if (release_gil)
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+ PyEval_RestoreThread (state);
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+
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+ gdbpy_convert_exception (except);
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+ return NULL;
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+ }
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}
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END_CATCH
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diff --git a/gdb/testsuite/gdb.python/py-gil-mthread.c b/gdb/testsuite/gdb.python/py-gil-mthread.c
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new file mode 100644
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--- /dev/null
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+++ b/gdb/testsuite/gdb.python/py-gil-mthread.c
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@@ -0,0 +1,13 @@
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+#include <stdio.h>
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+#include <unistd.h>
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+
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+int
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+main (void)
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+{
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+ int i;
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+ for (i = 0; i < 10; i++)
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+ {
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+ sleep (1); /* break-here */
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+ printf ("Sleeping %d\n", i);
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+ }
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+}
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diff --git a/gdb/testsuite/gdb.python/py-gil-mthread.exp b/gdb/testsuite/gdb.python/py-gil-mthread.exp
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new file mode 100644
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--- /dev/null
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+++ b/gdb/testsuite/gdb.python/py-gil-mthread.exp
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@@ -0,0 +1,69 @@
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+# Copyright (C) 2014 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+standard_testfile .c .py
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+set executable $testfile
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+
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+if { [prepare_for_testing $testfile.exp $executable $srcfile] } {
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+ return -1
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+}
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+
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+# Skip all tests if Python scripting is not enabled.
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+if { [skip_python_tests] } { continue }
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+
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+if ![runto_main] {
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+ return -1
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+}
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+
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+gdb_breakpoint $srcfile:[gdb_get_line_number "break-here"] temporary
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+gdb_continue_to_breakpoint "break-here" ".* break-here .*"
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+
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+set test "response"
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+set timeout 60
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+set sleeping_last -1
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+set hello_last 0
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+set minimal 5
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+gdb_test_multiple "python exec (open ('$srcdir/$subdir/$srcfile2').read ())" $test {
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+ -re "Error: unable to start thread\r\n" {
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+ fail $test
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+ # Not $gdb_prompt-synced!
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+ }
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+ -re "Sleeping (\[0-9\]+)\r\n" {
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+ set n $expect_out(1,string)
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+ if { $sleeping_last + 1 != $n } {
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+ fail $test
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+ } else {
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+ set sleeping_last $n
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+ if { $sleeping_last >= $minimal && $hello_last >= $minimal } {
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+ pass $test
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+ } else {
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+ exp_continue
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+ }
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+ }
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+ }
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+ -re "Hello \\( (\[0-9\]+) \\)\r\n" {
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+ set n $expect_out(1,string)
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+ if { $hello_last + 1 != $n } {
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+ fail $test
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+ } else {
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+ set hello_last $n
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+ if { $sleeping_last >= $minimal && $hello_last >= $minimal } {
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+ pass $test
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+ } else {
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+ exp_continue
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+ }
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+ }
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+ }
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+}
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diff --git a/gdb/testsuite/gdb.python/py-gil-mthread.py b/gdb/testsuite/gdb.python/py-gil-mthread.py
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new file mode 100644
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--- /dev/null
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+++ b/gdb/testsuite/gdb.python/py-gil-mthread.py
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@@ -0,0 +1,28 @@
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+try:
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+ import thread
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+except:
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+ import _thread
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+import time
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+import gdb
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+
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+# Define a function for the thread
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+def print_thread_hello():
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+ count = 0
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+ while count < 10:
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+ time.sleep(1)
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+ count += 1
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+ print ("Hello ( %d )" % count)
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+
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+# Create a threads a continue
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+try:
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+ thread.start_new_thread (print_thread_hello, ())
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+ gdb.execute ("continue", release_gil=True)
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+except:
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+ try:
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+ _thread.start_new_thread (print_thread_hello, ())
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+ gdb.execute ("continue", release_gil=True)
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+ except:
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+ print ("Error: unable to start thread")
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+
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+while 1:
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+ pass
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