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This replaces the pthread rwlock with a new implementation that uses a more scalable algorithm (primarily through not using a critical section anymore to make state changes). The fast path for rdlock acquisition and release is now basically a single atomic read-modify write or CAS and a few branches. See nptl/pthread_rwlock_common.c for details. * nptl/DESIGN-rwlock.txt: Remove. * nptl/lowlevelrwlock.sym: Remove. * nptl/Makefile: Add new tests. * nptl/pthread_rwlock_common.c: New file. Contains the new rwlock. * nptl/pthreadP.h (PTHREAD_RWLOCK_PREFER_READER_P): Remove. (PTHREAD_RWLOCK_WRPHASE, PTHREAD_RWLOCK_WRLOCKED, PTHREAD_RWLOCK_RWAITING, PTHREAD_RWLOCK_READER_SHIFT, PTHREAD_RWLOCK_READER_OVERFLOW, PTHREAD_RWLOCK_WRHANDOVER, PTHREAD_RWLOCK_FUTEX_USED): New. * nptl/pthread_rwlock_init.c (__pthread_rwlock_init): Adapt to new implementation. * nptl/pthread_rwlock_rdlock.c (__pthread_rwlock_rdlock_slow): Remove. (__pthread_rwlock_rdlock): Adapt. * nptl/pthread_rwlock_timedrdlock.c (pthread_rwlock_timedrdlock): Adapt. * nptl/pthread_rwlock_timedwrlock.c (pthread_rwlock_timedwrlock): Adapt. * nptl/pthread_rwlock_trywrlock.c (pthread_rwlock_trywrlock): Adapt. * nptl/pthread_rwlock_tryrdlock.c (pthread_rwlock_tryrdlock): Adapt. * nptl/pthread_rwlock_unlock.c (pthread_rwlock_unlock): Adapt. * nptl/pthread_rwlock_wrlock.c (__pthread_rwlock_wrlock_slow): Remove. (__pthread_rwlock_wrlock): Adapt. * nptl/tst-rwlock10.c: Adapt. * nptl/tst-rwlock11.c: Adapt. * nptl/tst-rwlock17.c: New file. * nptl/tst-rwlock18.c: New file. * nptl/tst-rwlock19.c: New file. * nptl/tst-rwlock2b.c: New file. * nptl/tst-rwlock8.c: Adapt. * nptl/tst-rwlock9.c: Adapt. * sysdeps/aarch64/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/arm/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/hppa/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/ia64/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/m68k/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/microblaze/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/mips/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/nios2/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/s390/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/sh/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/sparc/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/tile/nptl/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * sysdeps/x86/bits/pthreadtypes.h (pthread_rwlock_t): Adapt. * nptl/nptl-printers.py (): Adapt. * nptl/nptl_lock_constants.pysym: Adapt. * nptl/test-rwlock-printers.py: Adapt. * nptl/test-rwlockattr-printers.c: Adapt. * nptl/test-rwlockattr-printers.py: Adapt.
77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
# Common tests for the RWLockPrinter and RWLockAttributesPrinter classes.
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#
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# Copyright (C) 2016-2017 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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import sys
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from test_printers_common import *
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test_source = sys.argv[1]
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test_bin = sys.argv[2]
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printer_files = sys.argv[3:]
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printer_names = ['global glibc-pthread-locks']
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try:
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init_test(test_bin, printer_files, printer_names)
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go_to_main()
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check_debug_symbol('struct pthread_rwlockattr')
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rwlock_var = 'rwlock'
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rwlock_to_string = 'pthread_rwlock_t'
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attr_var = 'attr'
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attr_to_string = 'pthread_rwlockattr_t'
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break_at(test_source, 'Set kind')
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continue_cmd() # Go to test_setkind_np
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next_cmd(2)
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test_printer(rwlock_var, rwlock_to_string, {'Prefers': 'Readers'})
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test_printer(attr_var, attr_to_string, {'Prefers': 'Readers'})
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next_cmd(2)
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test_printer(rwlock_var, rwlock_to_string, {'Prefers': 'Writers'})
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test_printer(attr_var, attr_to_string, {'Prefers': 'Writers'})
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next_cmd(2)
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test_printer(rwlock_var, rwlock_to_string, {'Prefers': 'Writers no recursive readers'})
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test_printer(attr_var, attr_to_string, {'Prefers': 'Writers no recursive readers'})
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break_at(test_source, 'Set shared')
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continue_cmd() # Go to test_setpshared
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next_cmd(2)
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test_printer(rwlock_var, rwlock_to_string, {'Shared': 'Yes'})
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test_printer(attr_var, attr_to_string, {'Shared': 'Yes'})
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next_cmd(2)
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test_printer(rwlock_var, rwlock_to_string, {'Shared': 'No'})
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test_printer(attr_var, attr_to_string, {'Shared': 'No'})
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continue_cmd() # Exit
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except (NoLineError, pexpect.TIMEOUT) as exception:
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print('Error: {0}'.format(exception))
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result = FAIL
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except DebugError as exception:
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print(exception)
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result = UNSUPPORTED
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else:
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print('Test succeeded.')
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result = PASS
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exit(result)
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