Update.

[platform/upstream/glibc.git] / nptl / sysdeps / x86_64 / pthreaddef.h

diff --git a/nptl/sysdeps/x86_64/pthreaddef.h b/nptl/sysdeps/x86_64/pthreaddef.h
index 90a67f1..27896a4 100644 (file)
--- a/nptl/sysdeps/x86_64/pthreaddef.h
+++ b/nptl/sysdeps/x86_64/pthreaddef.h
@@ -36,6 +36,17 @@
   ({ char *frame; asm ("movq %%rsp, %0" : "=r" (frame)); frame; })
 
 
+/* We prefer to have the stack allocated in the low 4GB since this
+   allows faster context switches.  */
+#define ARCH_MAP_FLAGS MAP_32BIT
+
+/* If it is not possible to allocate memory there retry without that
+   flag.  */
+#define ARCH_RETRY_MMAP(size) \
+  mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,                              \
+       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)
+
+
 /* XXX Until we have a better place keep the definitions here.  */
 
 /* While there is no such syscall.  */