glibc/SOURCES/glibc-rh1966472-1.patch
2021-09-16 08:48:51 +00:00

160 lines
5.6 KiB
Diff

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