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authorFlorian Weimer <fweimer@redhat.com>2018-06-26 15:13:54 +0200
committerFlorian Weimer <fweimer@redhat.com>2018-06-26 15:27:12 +0200
commit124e025864bb39732c71fc60c1443d5680881a0a (patch)
tree2af69c84acc461764f9b8873089b3277b22725c0
parent935d920e763626dbcbbf655117285d1d270791a1 (diff)
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Run thread shutdown functions in an explicit order
This removes the __libc_thread_subfreeres hook in favor of explict calls. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
-rw-r--r--ChangeLog30
-rw-r--r--Makerules3
-rw-r--r--include/rpc/rpc.h2
-rw-r--r--include/string.h3
-rw-r--r--malloc/arena.c5
-rw-r--r--malloc/malloc-internal.h3
-rw-r--r--malloc/thread-freeres.c24
-rw-r--r--manual/memory.texi2
-rw-r--r--resolv/res-close.c7
-rw-r--r--resolv/resolv-internal.h3
-rw-r--r--resolv/resolv_conf.c4
-rw-r--r--string/strerror_l.c12
-rw-r--r--sunrpc/rpc_thread.c6
-rw-r--r--sysdeps/mach/strerror_l.c12
14 files changed, 70 insertions, 46 deletions
diff --git a/ChangeLog b/ChangeLog
index 5cd8566..eaee727 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,35 @@
2018-06-26 Florian Weimer <fweimer@redhat.com>
+ Run thread shutdown functions in an explicit order.
+ * malloc/thread-freeres.c (__libc_thread_subfreeres): Remove hook
+ definition.
+ (__libc_thread_freeres): Call thread shutdown functions
+ explicitly.
+ * include/rpc/rpc.h (__rpc_thread_destroy): Add hidden attribute.
+ * include/string.h (__strerror_thread_freeres): Declare.
+ * malloc/arena.c (__malloc_arena_thread_freeres): Renamed from
+ arena_thread_freeres. No longer static. Remove thread shutdown
+ hook registration.
+ * malloc/malloc-internal.h (__malloc_arena_thread_freeres):
+ Declare.
+ * resolv/res-close.c (__res_thread_freeres): Renamed from
+ res_thread_freeres. No longer static. Remove thread shutdown
+ hook registration.
+ * resolv/resolv-internal.h (__res_thread_freeres): Declare.
+ * resolv/resolv_conf.c (freeres): Remove incorrect section
+ attribute and use libc_freeres_fn.
+ * string/strerror_l.c (__strerror_thread_freeres): Renamed from
+ strerror_thread_freeres. No longer static. Remove thread
+ shutdown hook registration.
+ * sysdeps/mach/strerror_l.c (__strerror_thread_freeres): Likewise.
+ * sunrpc/rpc_thread.c (__rpc_thread_destroy): Remove thread
+ shutdown hook registration.
+ * Makerules (shlib.lds): Do not provide section boundary symbols
+ for __libc_thread_subfreeres.
+ * manual/memory.texi (Basic Allocation): Update comment.
+
+2018-06-26 Florian Weimer <fweimer@redhat.com>
+
Remove always-defined _RPC_THREAD_SAFE_ macro.
* sunrpc/Makefile (sunrpc-CPPFLAGS, CPPFLAGS, BUILD_CPPFLAGS):
Do not define _RPC_THREAD_SAFE_.
diff --git a/Makerules b/Makerules
index b2c2724..a10a0b4 100644
--- a/Makerules
+++ b/Makerules
@@ -648,9 +648,6 @@ $(common-objpfx)shlib.lds: $(common-objpfx)config.make $(..)Makerules
PROVIDE(__start___libc_atexit = .);\
__libc_atexit : { *(__libc_atexit) }\
PROVIDE(__stop___libc_atexit = .);\
- PROVIDE(__start___libc_thread_subfreeres = .);\
- __libc_thread_subfreeres : { *(__libc_thread_subfreeres) }\
- PROVIDE(__stop___libc_thread_subfreeres = .);\
PROVIDE(__start___libc_IO_vtables = .);\
__libc_IO_vtables : { *(__libc_IO_vtables) }\
PROVIDE(__stop___libc_IO_vtables = .);\
diff --git a/include/rpc/rpc.h b/include/rpc/rpc.h
index 327d843..f5cee6c 100644
--- a/include/rpc/rpc.h
+++ b/include/rpc/rpc.h
@@ -45,7 +45,7 @@ extern void __rpc_thread_svc_cleanup (void) attribute_hidden;
extern void __rpc_thread_clnt_cleanup (void) attribute_hidden;
extern void __rpc_thread_key_cleanup (void) attribute_hidden;
-extern void __rpc_thread_destroy (void);
+extern void __rpc_thread_destroy (void) attribute_hidden;
__libc_tsd_define (extern, struct rpc_thread_variables *, RPC_VARS)
diff --git a/include/string.h b/include/string.h
index bb4922c..4d622f1 100644
--- a/include/string.h
+++ b/include/string.h
@@ -50,6 +50,9 @@ extern int __ffs (int __i) __attribute__ ((const));
extern char *__strerror_r (int __errnum, char *__buf, size_t __buflen);
+/* Called as part of the thread shutdown sequence. */
+void __strerror_thread_freeres (void) attribute_hidden;
+
/* Get _STRING_ARCH_unaligned. */
#include <string_private.h>
#endif
diff --git a/malloc/arena.c b/malloc/arena.c
index 37183cf..497ae47 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -941,8 +941,8 @@ arena_get_retry (mstate ar_ptr, size_t bytes)
return ar_ptr;
}
-static void __attribute__ ((section ("__libc_thread_freeres_fn")))
-arena_thread_freeres (void)
+void
+__malloc_arena_thread_freeres (void)
{
/* Shut down the thread cache first. This could deallocate data for
the thread arena, so do this before we put the arena on the free
@@ -966,7 +966,6 @@ arena_thread_freeres (void)
__libc_lock_unlock (free_list_lock);
}
}
-text_set_element (__libc_thread_subfreeres, arena_thread_freeres);
/*
* Local variables:
diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h
index ad05450..9cee0fb 100644
--- a/malloc/malloc-internal.h
+++ b/malloc/malloc-internal.h
@@ -71,6 +71,9 @@ void __malloc_fork_unlock_parent (void) attribute_hidden;
/* Called in the child process after a fork. */
void __malloc_fork_unlock_child (void) attribute_hidden;
+/* Called as part of the thread shutdown sequence. */
+void __malloc_arena_thread_freeres (void) attribute_hidden;
+
/* Set *RESULT to LEFT * RIGHT. Return true if the multiplication
overflowed. */
static inline bool
diff --git a/malloc/thread-freeres.c b/malloc/thread-freeres.c
index 53ce41b..8902c84 100644
--- a/malloc/thread-freeres.c
+++ b/malloc/thread-freeres.c
@@ -16,16 +16,24 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <stdlib.h>
#include <libc-internal.h>
-#include <set-hooks.h>
+#include <malloc-internal.h>
+#include <resolv/resolv-internal.h>
+#include <rpc/rpc.h>
+#include <string.h>
-#ifdef _LIBC_REENTRANT
-DEFINE_HOOK (__libc_thread_subfreeres, (void));
-
-void __attribute__ ((section ("__libc_thread_freeres_fn")))
+/* Thread shutdown function. Note that this function must be called
+ for threads during shutdown for correctness reasons. Unlike
+ __libc_subfreeres, skipping calls to it is not a valid
+ optimization. */
+void
__libc_thread_freeres (void)
{
- RUN_HOOK (__libc_thread_subfreeres, ());
+ call_function_static_weak (__rpc_thread_destroy);
+ call_function_static_weak (__res_thread_freeres);
+ call_function_static_weak (__strerror_thread_freeres);
+
+ /* This should come last because it shuts down malloc for this
+ thread and the other shutdown functions might well call free. */
+ call_function_static_weak (__malloc_arena_thread_freeres);
}
-#endif
diff --git a/manual/memory.texi b/manual/memory.texi
index b95f6aa..2fac649 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -404,7 +404,7 @@ this function is in @file{stdlib.h}.
@c reads&writes next_to_use and iterates over arena next without guards
@c those are harmless as long as we don't drop arenas from the
@c NEXT list, and we never do; when a thread terminates,
-@c arena_thread_freeres prepends the arena to the free_list
+@c __malloc_arena_thread_freeres prepends the arena to the free_list
@c NEXT_FREE list, but NEXT is never modified, so it's safe!
@c mutex_trylock (arena lock) @asulock @aculock
@c mutex_lock (arena lock) dup @asulock @aculock
diff --git a/resolv/res-close.c b/resolv/res-close.c
index e02f5af..38572b1 100644
--- a/resolv/res-close.c
+++ b/resolv/res-close.c
@@ -126,8 +126,8 @@ res_nclose (res_state statp)
libc_hidden_def (__res_nclose)
/* This is called when a thread is exiting to free resources held in _res. */
-static void __attribute__ ((section ("__libc_thread_freeres_fn")))
-res_thread_freeres (void)
+void
+__res_thread_freeres (void)
{
__resolv_context_freeres ();
@@ -140,5 +140,4 @@ res_thread_freeres (void)
/* Make sure we do a full re-initialization the next time. */
_res.options = 0;
}
-text_set_element (__libc_thread_subfreeres, res_thread_freeres);
-text_set_element (__libc_subfreeres, res_thread_freeres);
+text_set_element (__libc_subfreeres, __res_thread_freeres);
diff --git a/resolv/resolv-internal.h b/resolv/resolv-internal.h
index ac6e495..b8e447c 100644
--- a/resolv/resolv-internal.h
+++ b/resolv/resolv-internal.h
@@ -97,4 +97,7 @@ int __res_nopt (struct resolv_context *, int n0,
int __inet_pton_length (int af, const char *src, size_t srclen, void *);
libc_hidden_proto (__inet_pton_length)
+/* Called as part of the thread shutdown sequence. */
+void __res_thread_freeres (void) attribute_hidden;
+
#endif /* _RESOLV_INTERNAL_H */
diff --git a/resolv/resolv_conf.c b/resolv/resolv_conf.c
index ab4e5dc..b4021ab 100644
--- a/resolv/resolv_conf.c
+++ b/resolv/resolv_conf.c
@@ -673,8 +673,7 @@ __resolv_conf_detach (struct __res_state *resp)
}
/* Deallocate the global data. */
-static void __attribute__ ((section ("__libc_thread_freeres_fn")))
-freeres (void)
+libc_freeres_fn (freeres)
{
/* No locking because this function is supposed to be called when
the process has turned single-threaded. */
@@ -698,4 +697,3 @@ freeres (void)
deallocated memory. */
global = NULL;
}
-text_set_element (__libc_subfreeres, freeres);
diff --git a/string/strerror_l.c b/string/strerror_l.c
index 7d90e80..2a9c3b5 100644
--- a/string/strerror_l.c
+++ b/string/strerror_l.c
@@ -57,15 +57,9 @@ strerror_l (int errnum, locale_t loc)
}
-#ifdef _LIBC
-# ifdef _LIBC_REENTRANT
-/* This is called when a thread is exiting to free the last_value string. */
-static void __attribute__ ((section ("__libc_thread_freeres_fn")))
-strerror_thread_freeres (void)
+void
+__strerror_thread_freeres (void)
{
free (last_value);
}
-text_set_element (__libc_thread_subfreeres, strerror_thread_freeres);
-text_set_element (__libc_subfreeres, strerror_thread_freeres);
-# endif
-#endif
+text_set_element (__libc_subfreeres, __strerror_thread_freeres);
diff --git a/sunrpc/rpc_thread.c b/sunrpc/rpc_thread.c
index 068a49f..a65a90d 100644
--- a/sunrpc/rpc_thread.c
+++ b/sunrpc/rpc_thread.c
@@ -15,7 +15,7 @@ static __thread struct rpc_thread_variables *thread_rpc_vars
/*
* Task-variable destructor
*/
-void __attribute__ ((section ("__libc_thread_freeres_fn")))
+void
__rpc_thread_destroy (void)
{
struct rpc_thread_variables *tvp = thread_rpc_vars;
@@ -36,12 +36,8 @@ __rpc_thread_destroy (void)
thread_rpc_vars = NULL;
}
}
-#ifdef _LIBC_REENTRANT
-text_set_element (__libc_thread_subfreeres, __rpc_thread_destroy);
-#endif
text_set_element (__libc_subfreeres, __rpc_thread_destroy);
-
/*
* Initialize RPC multi-threaded operation
*/
diff --git a/sysdeps/mach/strerror_l.c b/sysdeps/mach/strerror_l.c
index 61515a4..b9842cc 100644
--- a/sysdeps/mach/strerror_l.c
+++ b/sysdeps/mach/strerror_l.c
@@ -87,15 +87,9 @@ strerror_l (int errnum, locale_t loc)
}
-#ifdef _LIBC
-# ifdef _LIBC_REENTRANT
-/* This is called when a thread is exiting to free the last_value string. */
-static void __attribute__ ((section ("__libc_thread_freeres_fn")))
-strerror_thread_freeres (void)
+void
+__strerror_thread_freeres (void)
{
free (last_value);
}
-text_set_element (__libc_thread_subfreeres, strerror_thread_freeres);
-text_set_element (__libc_subfreeres, strerror_thread_freeres);
-# endif
-#endif
+text_set_element (__libc_subfreeres, __strerror_thread_freeres);