aa33ea6833
This test causes several timeouts for Clang, taking too long time to finish. The reason is, for an infinite loop of the form while(1); /* suppose this is line 30. */ Clang generates code that looks like 0x00000000004004d4 <+4>: jmp 0x4004d9 <loop+9> 0x00000000004004d9 <+9>: jmp 0x4004d9 <loop+9> So, the real loop is the instruction at address 0x4004d9. But a breakpoint that's defined at the loop line (assume line 30 in this case) is inserted at address 0x4004d4. (gdb) break 30 Breakpoint 1 at 0x4004d4: file test.c, line 30. Therefore, continuing a thread that was spinning on the loop does not hit the breakpoint. The bug is reported at https://bugs.llvm.org/show_bug.cgi?id=49614 Tweak the infinite loop to spin on a variable to avoid this bug. The test is unrelated to the bug. gdb/testsuite/ChangeLog: 2021-03-29 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com> * gdb.mi/user-selected-context-sync.exp: Spin on a variable in the infinite loop to avoid a Clang bug.
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2016-2021 Free Software Foundation, Inc.
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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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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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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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#include <pthread.h>
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#include <unistd.h>
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#define NUM_THREADS 2
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static pthread_barrier_t barrier;
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static void
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child_sub_function (void)
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{
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/* Deliberately spin on a variable instead of plain 'while (1)' to
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avoid the Clang bug https://bugs.llvm.org/show_bug.cgi?id=49614. */
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int spin = 1;
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while (spin); /* thread loop line */
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}
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static void *
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child_function (void *args)
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{
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pthread_barrier_wait (&barrier);
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child_sub_function (); /* thread caller line */
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return NULL;
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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 = 0;
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pthread_t threads[NUM_THREADS];
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/* Make the test exit eventually. */
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alarm (20);
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/* Initialize the barrier, NUM_THREADS plus the main thread. */
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pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1);
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for (i = 0; i < NUM_THREADS; i++)
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pthread_create (&threads[i], NULL, child_function, NULL);
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pthread_barrier_wait (&barrier);
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/* Deliberately spin on a variable instead of plain 'while (1)' to
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avoid the Clang bug https://bugs.llvm.org/show_bug.cgi?id=49614. */
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int spin = 1;
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while (spin); /* main break line */
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return 0;
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}
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