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nptl: Add __pthread_attr_copy for copying pthread_attr_t objects
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Also add the private type union pthread_attr_transparent, to reduce
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the amount of casting that is required.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Tested-by: Carlos O'Donell <carlos@redhat.com>
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(cherry picked from commit 331c6e8a184167dd21a9f0b3fc165aeefea6eeca)
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Difference from upstream:
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Unlike upstream, __pthread_attr_copy is in libpthread.so.
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# Conflicts:
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# nptl/Makefile
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# nptl/Versions
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diff --git a/nptl/Makefile b/nptl/Makefile
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index d6b37b6efd3b7d78..b14de3ffb330c10b 100644
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--- a/nptl/Makefile
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+++ b/nptl/Makefile
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@@ -54,7 +54,8 @@ libpthread-routines = nptl-init nptlfreeres vars events version pt-interp \
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pthread_getconcurrency pthread_setconcurrency \
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pthread_getschedparam pthread_setschedparam \
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pthread_setschedprio \
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- pthread_attr_init pthread_attr_destroy \
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+ pthread_attr_init pthread_attr_copy \
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+ pthread_attr_destroy \
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pthread_attr_getdetachstate pthread_attr_setdetachstate \
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pthread_attr_getguardsize pthread_attr_setguardsize \
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pthread_attr_getschedparam pthread_attr_setschedparam \
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diff --git a/nptl/Versions b/nptl/Versions
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index 6007fd03e7ed117c..e38272aa187fbe78 100644
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--- a/nptl/Versions
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+++ b/nptl/Versions
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@@ -283,5 +283,6 @@ libpthread {
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__pthread_barrier_init; __pthread_barrier_wait;
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__shm_directory;
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__libpthread_freeres;
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+ __pthread_attr_copy;
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}
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}
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diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
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index 00be8f92793e8710..a2d48b2015cd385c 100644
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--- a/nptl/pthreadP.h
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+++ b/nptl/pthreadP.h
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@@ -464,6 +464,9 @@ extern int __pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
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size_t *__restrict __stacksize);
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extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
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size_t __stacksize);
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+extern int __pthread_attr_setaffinity_np (pthread_attr_t *attr,
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+ size_t cpusetsize,
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+ const cpu_set_t *cpuset);
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extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
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const pthread_rwlockattr_t *__restrict
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__attr);
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@@ -605,6 +608,11 @@ extern void __wait_lookup_done (void) attribute_hidden;
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# define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
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#endif
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+/* Make a deep copy of the attribute *SOURCE in *TARGET. *TARGET is
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+ not assumed to have been initialized. Returns 0 on success, or a
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+ positive error code otherwise. */
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+int __pthread_attr_copy (pthread_attr_t *target, const pthread_attr_t *source);
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+
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/* Returns 0 if POL is a valid scheduling policy. */
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static inline int
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check_sched_policy_attr (int pol)
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diff --git a/nptl/pthread_attr_copy.c b/nptl/pthread_attr_copy.c
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new file mode 100644
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index 0000000000000000..67f272acf297100c
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--- /dev/null
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+++ b/nptl/pthread_attr_copy.c
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@@ -0,0 +1,56 @@
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+/* Deep copy of a pthread_attr_t object.
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+ Copyright (C) 2020 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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3bda5c |
+ <https://www.gnu.org/licenses/>. */
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+
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3bda5c |
+#include <errno.h>
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3bda5c |
+#include <pthreadP.h>
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3bda5c |
+#include <stdlib.h>
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+
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+int
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+__pthread_attr_copy (pthread_attr_t *target, const pthread_attr_t *source)
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3bda5c |
+{
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3bda5c |
+ /* Avoid overwriting *TARGET until all allocations have
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3bda5c |
+ succeeded. */
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3bda5c |
+ union pthread_attr_transparent temp;
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3bda5c |
+ temp.external = *source;
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3bda5c |
+
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3bda5c |
+ /* Force new allocation. This function has full ownership of temp. */
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3bda5c |
+ temp.internal.cpuset = NULL;
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3bda5c |
+ temp.internal.cpusetsize = 0;
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+
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3bda5c |
+ int ret = 0;
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+
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3bda5c |
+ struct pthread_attr *isource = (struct pthread_attr *) source;
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+
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3bda5c |
+ /* Propagate affinity mask information. */
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3bda5c |
+ if (isource->cpusetsize > 0)
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3bda5c |
+ ret = __pthread_attr_setaffinity_np (&temp.external,
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3bda5c |
+ isource->cpusetsize,
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3bda5c |
+ isource->cpuset);
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+
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3bda5c |
+ if (ret != 0)
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+ {
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3bda5c |
+ /* Deallocate because we have ownership. */
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3bda5c |
+ __pthread_attr_destroy (&temp.external);
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3bda5c |
+ return ret;
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+ }
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+
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+ /* Transfer ownership. *target is not assumed to have been
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+ initialized. */
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+ *target = temp.external;
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3bda5c |
+ return 0;
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+}
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3bda5c |
diff --git a/nptl/pthread_attr_setaffinity.c b/nptl/pthread_attr_setaffinity.c
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index 545b72c91e290216..914ebf6f9cbfd5ff 100644
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3bda5c |
--- a/nptl/pthread_attr_setaffinity.c
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3bda5c |
+++ b/nptl/pthread_attr_setaffinity.c
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@@ -55,6 +55,7 @@ __pthread_attr_setaffinity_new (pthread_attr_t *attr, size_t cpusetsize,
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return 0;
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}
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+strong_alias (__pthread_attr_setaffinity_new, __pthread_attr_setaffinity_np)
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versioned_symbol (libpthread, __pthread_attr_setaffinity_new,
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pthread_attr_setaffinity_np, GLIBC_2_3_4);
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diff --git a/sysdeps/nptl/internaltypes.h b/sysdeps/nptl/internaltypes.h
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index b78ad99a888b4e3b..d3dce1278de989e2 100644
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--- a/sysdeps/nptl/internaltypes.h
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3bda5c |
+++ b/sysdeps/nptl/internaltypes.h
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3bda5c |
@@ -49,6 +49,13 @@ struct pthread_attr
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3bda5c |
#define ATTR_FLAG_SCHED_SET 0x0020
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3bda5c |
#define ATTR_FLAG_POLICY_SET 0x0040
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3bda5c |
+/* Used to allocate a pthread_attr_t object which is also accessed
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3bda5c |
+ internally. */
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3bda5c |
+union pthread_attr_transparent
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+{
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3bda5c |
+ pthread_attr_t external;
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3bda5c |
+ struct pthread_attr internal;
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3bda5c |
+};
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/* Mutex attribute data structure. */
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3bda5c |
struct pthread_mutexattr
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