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Message-ID: <5968C08E.60008@arm.com> Date: Fri, 14 Jul 2017 14:01:02 +0100 From: Szabolcs Nagy User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 MIME-Version: 1.0 To: GNU C Library , Florian Weimer CC: nd@arm.com Subject: [PATCH] Disable single thread optimization for open_memstream X-ClientProxiedBy: DB6P18901CA0015.EURP189.PROD.OUTLOOK.COM (2603:10a6:4:16::25) To DB6PR0802MB2486.eurprd08.prod.outlook.com (2603:10a6:4:a0::21) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ba265fa8-cc4b-4790-b4eb-08d4cab862e3 X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(48565401081)(300000503095)(300135400095)(49563074)(201703131423075)(201703031133081)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); SRVR:DB6PR0802MB2486; X-Microsoft-Exchange-Diagnostics: 1; DB6PR0802MB2486; 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This is in principle true for all stream objects that user code can access (and thus needs locking), using the same internal list as fflush(0) uses. However in glibc open_memstream is not on that list (BZ 21735) so the optimization has to be disabled. OK with the test? 2017-07-14 Szabolcs Nagy Florian Weimer * libio/memstream.c (__open_memstream): Set _IO_FLAGS2_NEED_LOCK. * libio/wmemstream.c (open_wmemstream): Likewise. * nptl/tst-memstream.c: New. diff --git a/libio/memstream.c b/libio/memstream.c index f83d4a5213..e391efd48a 100644 --- a/libio/memstream.c +++ b/libio/memstream.c @@ -96,6 +96,9 @@ __open_memstream (char **bufloc, _IO_size_t *sizeloc) new_f->fp.bufloc = bufloc; new_f->fp.sizeloc = sizeloc; + /* Disable single thread optimization. BZ 21735. */ + new_f->fp._sf._sbf._f._flags2 |= _IO_FLAGS2_NEED_LOCK; + return (_IO_FILE *) &new_f->fp._sf._sbf; } libc_hidden_def (__open_memstream) diff --git a/libio/wmemstream.c b/libio/wmemstream.c index 5bc77f52ee..103a760bf5 100644 --- a/libio/wmemstream.c +++ b/libio/wmemstream.c @@ -98,6 +98,9 @@ open_wmemstream (wchar_t **bufloc, _IO_size_t *sizeloc) new_f->fp.bufloc = bufloc; new_f->fp.sizeloc = sizeloc; + /* Disable single thread optimization. BZ 21735. */ + new_f->fp._sf._sbf._f._flags2 |= _IO_FLAGS2_NEED_LOCK; + return (_IO_FILE *) &new_f->fp._sf._sbf; } diff --git a/nptl/Makefile b/nptl/Makefile index 853da72e74..dd01994d3e 100644 --- a/nptl/Makefile +++ b/nptl/Makefile @@ -302,7 +302,7 @@ tests = tst-attr1 tst-attr2 tst-attr3 tst-default-attr \ c89 gnu89 c99 gnu99 c11 gnu11) \ tst-bad-schedattr \ tst-thread_local1 tst-mutex-errorcheck tst-robust10 \ - tst-robust-fork tst-create-detached + tst-robust-fork tst-create-detached tst-memstream tests-internal := tst-typesizes tst-rwlock19 tst-sem11 tst-sem12 tst-sem13 \ tst-barrier5 tst-signal7 tst-mutex8 tst-mutex8-static \ diff --git a/nptl/tst-memstream.c b/nptl/tst-memstream.c new file mode 100644 index 0000000000..335c6ed638 --- /dev/null +++ b/nptl/tst-memstream.c @@ -0,0 +1,91 @@ +/* Test for open_memstream locking. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include + +enum +{ + thread_count = 2, + byte_count = 1000000, +}; + +struct closure +{ + FILE *fp; + char b; +}; + +static void * +thread_func (void *closure) +{ + struct closure *args = closure; + + for (int i = 0; i < byte_count; ++i) + fputc (args->b, args->fp); + + return NULL; +} + +int +do_test (void) +{ + char *buffer = NULL; + size_t buffer_length = 0; + FILE *fp = open_memstream (&buffer, &buffer_length); + if (fp == NULL) + FAIL_RET ("open_memstream: %m"); + + pthread_t threads[thread_count]; + struct closure args[thread_count]; + + for (int i = 0; i < thread_count; ++i) + { + args[i].fp = fp; + args[i].b = 'A' + i; + threads[i] = xpthread_create (NULL, thread_func, args + i); + } + + for (int i = 0; i < thread_count; ++i) + xpthread_join (threads[i]); + + fclose (fp); + + if (buffer_length != thread_count * byte_count) + FAIL_RET ("unexpected number of written bytes: %zu (should be %d)", + buffer_length, thread_count * byte_count); + + size_t counts[thread_count] = { 0, }; + for (size_t i = 0; i < buffer_length; ++i) + { + if (buffer[i] < 'A' || buffer[i] >= 'A' + thread_count) + FAIL_RET ("written byte at %zu out of range: %d", i, buffer[i] & 0xFF); + ++counts[buffer[i] - 'A']; + } + for (int i = 0; i < thread_count; ++i) + if (counts[i] != byte_count) + FAIL_RET ("incorrect write count for thread %d: %zu (should be %d)", i, + counts[i], byte_count); + + return 0; +} + +#define TIMEOUT 100 +#include