Do not crash if /proc is not mounted

When proc is not mounted pthread_getattr_np fails, so default
to 1MB stack in getStackLimit and to exactGC in MemoryManager

Change-Id: Ic7515fd420f2d39a656808d24a3915a657722891
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/src/qml/jsruntime/qv4mm.cpp b/src/qml/jsruntime/qv4mm.cpp
index f67efaffb9..9923c8834c 100644
--- a/src/qml/jsruntime/qv4mm.cpp
+++ b/src/qml/jsruntime/qv4mm.cpp
@@ -234,12 +234,17 @@ MemoryManager::MemoryManager()
 #  else
     void* stackBottom = 0;
     pthread_attr_t attr;
-    pthread_getattr_np(pthread_self(), &attr);
-    size_t stackSize = 0;
-    pthread_attr_getstack(&attr, &stackBottom, &stackSize);
-    pthread_attr_destroy(&attr);
+    if (pthread_getattr_np(pthread_self(), &attr) == 0) {
+        size_t stackSize = 0;
+        pthread_attr_getstack(&attr, &stackBottom, &stackSize);
+        pthread_attr_destroy(&attr);
 
-    m_d->stackTop = static_cast<quintptr *>(stackBottom) + stackSize/sizeof(quintptr);
+        m_d->stackTop = static_cast<quintptr *>(stackBottom) + stackSize/sizeof(quintptr);
+    } else {
+        // can't scan the native stack so have to rely on exact gc
+        m_d->stackTop = 0;
+        m_d->exactGC = true;
+    }
 #  endif
 #elif OS(WINCE)
     if (false && g_stackBase) {