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[PATCH] hurd: add gscope support
- From: Samuel Thibault <samuel dot thibault at ens-lyon dot org>
- To: libc-alpha at sourceware dot org
- Cc: Samuel Thibault <samuel dot thibault at ens-lyon dot org>
- Date: Thu, 1 Mar 2018 01:50:14 +0100
- Subject: [PATCH] hurd: add gscope support
- Authentication-results: sourceware.org; auth=none
* elf/dl-support.c [THREAD_GSCOPE_GLOBAL] (_dl_thread_gscope_count):
Define variable.
* sysdeps/generic/ldsodefs.h [THREAD_GSCOPE_GLOBAL] (struct
rtld_global): Add _dl_thread_gscope_count member.
* sysdeps/mach/hurd/tls.h: Include <atomic.h>.
[!defined __ASSEMBLER__] (THREAD_GSCOPE_GLOBAL, THREAD_GSCOPE_SET_FLAG,
THREAD_GSCOPE_RESET_FLAG, THREAD_GSCOPE_WAIT): Define macros.
---
ChangeLog | 10 ++++++++++
elf/dl-support.c | 3 +++
sysdeps/generic/ldsodefs.h | 3 +++
sysdeps/mach/hurd/tls.h | 16 ++++++++++++++++
4 files changed, 32 insertions(+)
diff --git a/elf/dl-support.c b/elf/dl-support.c
index 114f77a8e5..be564306f2 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -188,6 +188,9 @@ int (*_dl_make_stack_executable_hook) (void **) = _dl_make_stack_executable;
/* Function in libpthread to wait for termination of lookups. */
void (*_dl_wait_lookup_done) (void);
+#ifdef THREAD_GSCOPE_GLOBAL
+int _dl_thread_gscope_count;
+#endif
struct dl_scope_free_list *_dl_scope_free_list;
#ifdef NEED_DL_SYSINFO
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 5e1b24ecb5..2447cd6717 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -435,6 +435,9 @@ struct rtld_global
size_t count;
void *list[50];
} *_dl_scope_free_list;
+#ifdef THREAD_GSCOPE_GLOBAL
+ EXTERN int _dl_thread_gscope_count;
+#endif
#ifdef SHARED
};
# define __rtld_global_attribute__
diff --git a/sysdeps/mach/hurd/tls.h b/sysdeps/mach/hurd/tls.h
index faff87c7b5..47a9a357c8 100644
--- a/sysdeps/mach/hurd/tls.h
+++ b/sysdeps/mach/hurd/tls.h
@@ -27,6 +27,7 @@
# include <sysdep.h>
# include <mach/mig_errors.h>
# include <mach.h>
+# include <atomic.h>
/* This is the size of the initial TCB. */
@@ -51,6 +52,21 @@
# define GET_DTV(descr) \
(((tcbhead_t *) (descr))->dtv)
+/* Temporary poor-man's global scope switch support */
+#define THREAD_GSCOPE_GLOBAL
+#define THREAD_GSCOPE_SET_FLAG() \
+ atomic_increment(&GL(dl_thread_gscope_count))
+#define THREAD_GSCOPE_RESET_FLAG() do { \
+ if (atomic_decrement_val(&GL(dl_thread_gscope_count)) == 0) \
+ lll_wake(&GL(dl_thread_gscope_count), 0); \
+} while (0)
+#define THREAD_GSCOPE_WAIT() do { \
+ int count; \
+ while ((count = GL(dl_thread_gscope_count))) { \
+ lll_wait(&GL(dl_thread_gscope_count), count, 0); \
+ } \
+} while (0)
+
#endif /* !ASSEMBLER */
--
2.16.1