2006-02-06 Jakub Jelinek <jakub@redhat.com>

	    Anthony Green  <green@redhat.com>
	    Tom Tromey  <tromey@redhat.com>

	* include/gc_ext_config.h.in: Added GC_PTHREAD_SYM_VERSION.
	* include/gc_config.h.in: Rebuilt.
	* include/gc_pthread_redirects.h (pthread_create): Conditionally
	define.
	* pthread_support.c (pthread_create_): New global.
	(constr): New function.
	(pthread_create): Conditionally renamed.
	* configure: Rebuilt.
	* configure.ac (GC_PTHREAD_SYM_VERSION): Define.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@110682 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 34 insertions, 2 deletions

diff --git a/pthread_support.c b/pthread_support.c
index 4271803c..7c7bb051 100644
--- a/pthread_support.c
+++ b/pthread_support.c
@@ -47,6 +47,9 @@
 /*#define DEBUG_THREADS 1*/
 /*#define GC_ASSERTIONS*/
 
+#define _GNU_SOURCE
+#include <dlfcn.h>
+
 # include "gc.h"
 # include "private/pthread_support.h"
 
@@ -1193,8 +1196,37 @@ void * GC_start_routine(void * arg)
     return(result);
 }
 
+#ifdef GC_PTHREAD_SYM_VERSION
+
+/* Force constr to execute prior to main().  */
+static void constr (void) __attribute__ ((constructor));
+
+static int
+(*pthread_create_)(pthread_t *new_thread,
+		   const pthread_attr_t *attr_in,
+		   void * (*thread_execp)(void *), void *arg);
+
+static void
+constr (void)
+{
+  /* Get a pointer to the real pthread_create.  */
+  pthread_create_ = dlvsym (RTLD_NEXT, "pthread_create",
+			    GC_PTHREAD_SYM_VERSION);
+}
+
+#define GC_PTHREAD_CREATE_NAME pthread_create
+#define GC_PTHREAD_REAL_NAME (*pthread_create_)
+
+#else
+
+#define GC_PTHREAD_CREATE_NAME WRAP_FUNC(pthread_create)
+#define GC_PTHREAD_REAL_NAME REAL_FUNC(pthread_create)
+
+#endif
+
+
 int
-WRAP_FUNC(pthread_create)(pthread_t *new_thread,
+GC_PTHREAD_CREATE_NAME(pthread_t *new_thread,
 		  const pthread_attr_t *attr,
                   void *(*start_routine)(void *), void *arg)
 {
@@ -1255,7 +1287,7 @@ WRAP_FUNC(pthread_create)(pthread_t *new_thread,
 		   pthread_self());
 #   endif
 
-    result = REAL_FUNC(pthread_create)(new_thread, attr, GC_start_routine, si);
+    result = GC_PTHREAD_REAL_NAME(new_thread, attr, GC_start_routine, si);
 
 #   ifdef DEBUG_THREADS
         GC_printf1("Started thread 0x%X\n", *new_thread);