| 1 | /* Test support for single-thread optimizations. No threads, static dlopen. |
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| 2 | Copyright (C) 2020-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* In a static dlopen scenario, the single-threaded optimization is |
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| 20 | not possible because their is no globally shared dynamic linker |
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| 21 | across all namespaces. */ |
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| 22 | |
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| 23 | #include <stddef.h> |
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| 24 | #include <support/check.h> |
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| 25 | #include <support/xdlfcn.h> |
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| 26 | #include <sys/single_threaded.h> |
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| 27 | |
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| 28 | static int |
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| 29 | do_test (void) |
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| 30 | { |
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| 31 | TEST_VERIFY (__libc_single_threaded); |
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| 32 | |
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| 33 | /* Defined in tst-single-threaded-mod1.o. */ |
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| 34 | extern _Bool single_threaded_1 (void); |
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| 35 | TEST_VERIFY (single_threaded_1 ()); |
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| 36 | |
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| 37 | /* A failed dlopen does not change the multi-threaded status. */ |
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| 38 | TEST_VERIFY (dlopen ("tst-single_threaded-does-not-exist.so" , RTLD_LAZY) |
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| 39 | == NULL); |
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| 40 | TEST_VERIFY (__libc_single_threaded); |
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| 41 | TEST_VERIFY (single_threaded_1 ()); |
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| 42 | |
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| 43 | /* And neither does a successful dlopen for outer (static) libc. */ |
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| 44 | void *handle_mod2 = xdlopen (filename: "tst-single_threaded-mod2.so" , RTLD_LAZY); |
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| 45 | _Bool (*single_threaded_2) (void) |
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| 46 | = xdlsym (handle: handle_mod2, symbol: "single_threaded_2" ); |
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| 47 | TEST_VERIFY (__libc_single_threaded); |
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| 48 | TEST_VERIFY (single_threaded_1 ()); |
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| 49 | /* The inner libc always assumes multi-threaded use. */ |
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| 50 | TEST_VERIFY (!single_threaded_2 ()); |
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| 51 | |
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| 52 | xdlclose (handle: handle_mod2); |
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| 53 | |
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| 54 | return 0; |
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| 55 | } |
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| 56 | |
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| 57 | #include <support/test-driver.c> |
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| 58 | |
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