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Add pthred_getattr_np / phread_attr_getstrack alternatives for uClibc
Based on https://dev.openwrt.org/log/packages/Xorg/lib/qt4/patches/100-fix-webkit-for-uclibc.patch?rev=20371
Signed-off-by: Johan Sagaert <sagaert.johan@skynet.be>
---
src/3rdparty/javascriptcore/JavaScriptCore/runtime/Collector.cpp | 61 ++++++++++
1 file changed, 61 insertions(+)
Index: qt-everywhere-opensource-src-4.8.1/src/3rdparty/javascriptcore/JavaScriptCore/runtime/Collector.cpp
===================================================================
--- qt-everywhere-opensource-src-4.8.1.orig/src/3rdparty/javascriptcore/JavaScriptCore/runtime/Collector.cpp
+++ qt-everywhere-opensource-src-4.8.1/src/3rdparty/javascriptcore/JavaScriptCore/runtime/Collector.cpp
@@ -70,6 +70,23 @@
#endif
#include <unistd.h>
+#if defined(QT_LINUXBASE)
+#include <dlfcn.h>
+#endif
+
+#if defined(__UCLIBC__)
+// versions of uClibc 0.9.32 and below with linuxthreads.old do not have
+// pthread_getattr_np or pthread_attr_getstack.
+#if __UCLIBC_MAJOR__ == 0 && \
+ (__UCLIBC_MINOR__ < 9 || \
+ (__UCLIBC_MINOR__ == 9 && __UCLIBC_SUBLEVEL__ <= 32)) && \
+ defined(__LINUXTHREADS_OLD__)
+#define UCLIBC_USE_PROC_SELF_MAPS 1
+#include <stdio_ext.h>
+extern int *__libc_stack_end;
+#endif
+#endif
+
#if OS(SOLARIS)
#include <thread.h>
#else
@@ -648,6 +665,37 @@
get_thread_info(find_thread(NULL), &threadInfo);
return threadInfo.stack_end;
#elif OS(UNIX)
+#ifdef UCLIBC_USE_PROC_SELF_MAPS
+ // Read /proc/self/maps and locate the line whose address
+ // range contains __libc_stack_end.
+ FILE *file = fopen("/proc/self/maps", "r");
+ if (!file)
+ return 0;
+ __fsetlocking(file, FSETLOCKING_BYCALLER);
+ char *line = NULL;
+ size_t lineLen = 0;
+ while (!feof_unlocked(file)) {
+ if (getdelim(&line, &lineLen, '\n', file) <= 0)
+ break;
+
+ long from;
+ long to;
+ if (sscanf (line, "%lx-%lx", &from, &to) != 2)
+ continue;
+ if (from <= (long)__libc_stack_end && (long)__libc_stack_end < to) {
+ fclose(file);
+ free(line);
+#ifdef _STACK_GROWS_UP
+ return (void *)from;
+#else
+ return (void *)to;
+#endif
+ }
+ }
+ fclose(file);
+ free(line);
+ return 0;
+#else
AtomicallyInitializedStatic(Mutex&, mutex = *new Mutex);
MutexLocker locker(mutex);
static void* stackBase = 0;
@@ -655,11 +703,23 @@
static pthread_t stackThread;
pthread_t thread = pthread_self();
if (stackBase == 0 || thread != stackThread) {
+
+#if defined(QT_LINUXBASE)
+ // LinuxBase is missing pthread_getattr_np - resolve it once at runtime instead
+ // see http://bugs.linuxbase.org/show_bug.cgi?id=2364
+ typedef int (*GetAttrPtr)(pthread_t, pthread_attr_t *);
+ static int (*pthread_getattr_np_ptr)(pthread_t, pthread_attr_t *) = 0;
+ if (!pthread_getattr_np_ptr)
+ *(void **)&pthread_getattr_np_ptr = dlsym(RTLD_DEFAULT, "pthread_getattr_np");
+#endif
pthread_attr_t sattr;
pthread_attr_init(&sattr);
#if HAVE(PTHREAD_NP_H) || OS(NETBSD)
// e.g. on FreeBSD 5.4, neundorf@kde.org
pthread_attr_get_np(thread, &sattr);
+#elif defined(QT_LINUXBASE)
+ if (pthread_getattr_np_ptr)
+ pthread_getattr_np_ptr(thread, &sattr);
#else
// FIXME: this function is non-portable; other POSIX systems may have different np alternatives
pthread_getattr_np(thread, &sattr);
@@ -671,6 +731,7 @@
stackThread = thread;
}
return static_cast<char*>(stackBase) + stackSize;
+#endif
#else
#error Need a way to get the stack base on this platform
#endif
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