Hi,
Attached 72_all_uClibc-0.9.29-linuxthreads.patch is from gentoo as in
http://bugs.busybox.net/view.php?id=5134
Can somebody who is involved with threads take a look?
--- a/libpthread/linuxthreads.old/attr.c 2006-01-24 12:41:01.000000000 -0500
+++ b/libpthread/linuxthreads.old/attr.c 2008-02-10 11:35:32.000000000 -0500
@@ -25,6 +25,14 @@
#include "pthread.h"
#include "internals.h"
+#include <sys/resource.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <sys/resource.h>
+
+
/* NOTE: With uClibc I don't think we need this versioning stuff.
* Therefore, define the function pthread_attr_init() here using
* a strong symbol. */
@@ -209,4 +217,94 @@ int __pthread_attr_getstacksize(const pt
*stacksize = attr->__stacksize;
return 0;
}
+
+
+extern int *__libc_stack_end;
+
weak_alias (__pthread_attr_getstacksize, pthread_attr_getstacksize)
+void* pthread_getattr_np(pthread_t thread, pthread_attr_t *attr)
+{
+ static void *stackBase = 0;
+ static size_t stackSize = 0;
+ int ret = 0;
+ /* Stack size limit. */
+ struct rlimit rl;
+
+ /* The safest way to get the top of the stack is to read
+ /proc/self/maps and locate the line into which
+ __libc_stack_end falls. */
+ FILE *fp = fopen("/proc/self/maps", "rc");
+ if (fp == NULL)
+ ret = errno;
+ /* We need the limit of the stack in any case. */
+ else if (getrlimit (RLIMIT_STACK, &rl) != 0)
+ ret = errno;
+ else {
+ /* We need no locking. */
+ __fsetlocking (fp, FSETLOCKING_BYCALLER);
+
+ /* Until we found an entry (which should always be the case)
+ mark the result as a failure. */
+ ret = ENOENT;
+
+ char *line = NULL;
+ size_t linelen = 0;
+ uintptr_t last_to = 0;
+
+ while (! feof_unlocked (fp)) {
+ if (getdelim (&line, &linelen, '\n', fp) <= 0)
+ break;
+
+ uintptr_t from;
+ uintptr_t to;
+ if (sscanf (line, "%x-%x", &from, &to) != 2)
+ continue;
+ if (from <= (uintptr_t) __libc_stack_end
+ && (uintptr_t) __libc_stack_end < to) {
+ /* Found the entry. Now we have the info we need. */
+ attr->__stacksize = rl.rlim_cur;
+#ifdef _STACK_GROWS_UP
+ /* Don't check to enforce a limit on the __stacksize */
+ attr->__stackaddr = (void *) from;
+#else
+ attr->__stackaddr = (void *) to;
+
+ /* The limit might be too high. */
+ if ((size_t) attr->__stacksize > (size_t) attr->__stackaddr - last_to)
+ attr->__stacksize = (size_t) attr->__stackaddr - last_to;
+#endif
+
+ /* We succeed and no need to look further. */
+ ret = 0;
+ break;
+ }
+ last_to = to;
+ }
+
+ fclose (fp);
+ free (line);
+ }
+#ifndef _STACK_GROWS_UP
+ stackBase = (char *) attr->__stackaddr - attr->__stacksize;
+#else
+ stackBase = attr->__stackaddr;
+#endif
+ stackSize = attr->__stacksize;
+ return (void*)(stackBase + stackSize);
+}
+
+int __pthread_attr_getstack (const pthread_attr_t *attr, void **stackaddr,
+ size_t *stacksize)
+{
+ /* XXX This function has a stupid definition. The standard specifies
+ no error value but what is if no stack address was set? We simply
+ return the value we have in the member. */
+#ifndef _STACK_GROWS_UP
+ *stackaddr = (char *) attr->__stackaddr - attr->__stacksize;
+#else
+ *stackaddr = attr->__stackaddr;
+#endif
+ *stacksize = attr->__stacksize;
+ return 0;
+}
+weak_alias (__pthread_attr_getstack, pthread_attr_getstack)
--- a/libpthread/linuxthreads.old/sysdeps/pthread/pthread.h 2006-12-07 22:19:36.000000000 -0500
+++ b/libpthread/linuxthreads.old/sysdeps/pthread/pthread.h 2008-02-10 11:42:35.000000000 -0500
@@ -288,15 +288,11 @@ extern int pthread_attr_getstacksize (__
__attr, size_t *__restrict __stacksize)
__THROW;
-#if 0
-/* Not yet implemented in uClibc! */
-
#ifdef __USE_GNU
/* Initialize thread attribute *ATTR with attributes corresponding to the
already running thread TH. It shall be called on unitialized ATTR
and destroyed with pthread_attr_destroy when no longer needed. */
-extern int pthread_getattr_np (pthread_t __th, pthread_attr_t *__attr) __THROW;
-#endif
+extern void* pthread_getattr_np(pthread_t thread, pthread_attr_t *attr);
#endif
/* Functions for scheduling control. */
@@ -599,6 +595,11 @@ extern int pthread_cancel (pthread_t __c
cancelled. */
extern void pthread_testcancel (void);
+/* Return the previously set address for the stack. */
+extern int pthread_attr_getstack (__const pthread_attr_t *__restrict __attr,
+ void **__restrict __stackaddr,
+ size_t *__restrict __stacksize) __THROW;
+
/* Install a cleanup handler: ROUTINE will be called with arguments ARG
when the thread is cancelled or calls pthread_exit. ROUTINE will also
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