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authorAustin Foxley <austinf@cetoncorp.com>2010-02-16 12:27:18 -0800
committerAustin Foxley <austinf@cetoncorp.com>2010-02-16 12:27:18 -0800
commita032a6587011cbdac8c2f7e11f15dc4e592bbb55 (patch)
treeb8d8dfc6abf0168e098223c2134a3e4bd7640942 /libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c
parent70f1d42b13a741f603472f405299e5d2938aa728 (diff)
mass sync with glibc nptl
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
Diffstat (limited to 'libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c')
-rw-r--r--libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c80
1 files changed, 62 insertions, 18 deletions
diff --git a/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c b/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c
index 8b1f24407..e058604f3 100644
--- a/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c
+++ b/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2005, 2006, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>.
@@ -21,10 +21,10 @@
#include <stdio.h>
#include <unwind.h>
#include <pthreadP.h>
+#include <sysdep.h>
+#include <libgcc_s.h>
-#define __libc_dlopen(x) dlopen(x, (RTLD_LOCAL | RTLD_LAZY))
-#define __libc_dlsym dlsym
-
+static void *libgcc_s_handle;
static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
static _Unwind_Reason_Code (*libgcc_s_personality)
(int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
@@ -34,15 +34,23 @@ static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *);
void
+__attribute_noinline__
pthread_cancel_init (void)
{
- void *resume, *personality, *forcedunwind, *getcfa;
+ void *resume;
+ void *personality;
+ void *forcedunwind;
+ void *getcfa;
void *handle;
- if (__builtin_expect (libgcc_s_getcfa != NULL, 1))
- return;
+ if (__builtin_expect (libgcc_s_handle != NULL, 1))
+ {
+ /* Force gcc to reload all values. */
+ __asm__ volatile ("" ::: "memory");
+ return;
+ }
- handle = __libc_dlopen ("libgcc_s.so.1");
+ handle = __libc_dlopen (LIBGCC_S_SO);
if (handle == NULL
|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
@@ -55,22 +63,46 @@ pthread_cancel_init (void)
#endif
)
{
- printf("libgcc_s.so.1 must be installed for pthread_cancel to work\n");
+ printf (LIBGCC_S_SO " must be installed for pthread_cancel to work\n");
abort();
}
+ PTR_MANGLE (resume);
libgcc_s_resume = resume;
+ PTR_MANGLE (personality);
libgcc_s_personality = personality;
+ PTR_MANGLE (forcedunwind);
libgcc_s_forcedunwind = forcedunwind;
+ PTR_MANGLE (getcfa);
libgcc_s_getcfa = getcfa;
+ /* Make sure libgcc_s_handle is written last. Otherwise,
+ pthread_cancel_init might return early even when the pointer the
+ caller is interested in is not initialized yet. */
+ atomic_write_barrier ();
+ libgcc_s_handle = handle;
+}
+
+void
+__libc_freeres_fn_section
+__unwind_freeres (void)
+{
+ void *handle = libgcc_s_handle;
+ if (handle != NULL)
+ {
+ libgcc_s_handle = NULL;
+ __libc_dlclose (handle);
+ }
}
void
_Unwind_Resume (struct _Unwind_Exception *exc)
{
- if (__builtin_expect (libgcc_s_resume == NULL, 0))
+ if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
- libgcc_s_resume (exc);
+
+ void (*resume) (struct _Unwind_Exception *exc) = libgcc_s_resume;
+ PTR_DEMANGLE (resume);
+ resume (exc);
}
_Unwind_Reason_Code
@@ -79,25 +111,37 @@ __gcc_personality_v0 (int version, _Unwind_Action actions,
struct _Unwind_Exception *ue_header,
struct _Unwind_Context *context)
{
- if (__builtin_expect (libgcc_s_personality == NULL, 0))
+ if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
- return libgcc_s_personality (version, actions, exception_class,
- ue_header, context);
+
+ _Unwind_Reason_Code (*personality)
+ (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
+ struct _Unwind_Context *) = libgcc_s_personality;
+ PTR_DEMANGLE (personality);
+ return personality (version, actions, exception_class, ue_header, context);
}
_Unwind_Reason_Code
_Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
void *stop_argument)
{
- if (__builtin_expect (libgcc_s_forcedunwind == NULL, 0))
+ if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
- return libgcc_s_forcedunwind (exc, stop, stop_argument);
+
+ _Unwind_Reason_Code (*forcedunwind)
+ (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *)
+ = libgcc_s_forcedunwind;
+ PTR_DEMANGLE (forcedunwind);
+ return forcedunwind (exc, stop, stop_argument);
}
_Unwind_Word
_Unwind_GetCFA (struct _Unwind_Context *context)
{
- if (__builtin_expect (libgcc_s_getcfa == NULL, 0))
+ if (__builtin_expect (libgcc_s_handle == NULL, 0))
pthread_cancel_init ();
- return libgcc_s_getcfa (context);
+
+ _Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa;
+ PTR_DEMANGLE (getcfa);
+ return getcfa (context);
}