Mesa (master): glsl: protect anonymous struct id with a mutex

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: a6706163cb539fdb1f0432795d5c24b3e38f5cd7
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a6706163cb539fdb1f0432795d5c24b3e38f5cd7

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Wed Aug 20 14:40:28 2014 +0800

glsl: protect anonymous struct id with a mutex

There may be two contexts compiling shaders at the same time, and we want the
anonymous struct id to be globally unique.

Signed-off-by: Chia-I Wu <olv at lunarg.com>
Reviewed-by: Brian Paul <brianp at vmware.com>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/glsl/glsl_parser_extras.cpp |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index 79f8494..27e3301 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -1350,9 +1350,15 @@ ast_struct_specifier::ast_struct_specifier(const char *identifier,
 					   ast_declarator_list *declarator_list)
 {
    if (identifier == NULL) {
+      static mtx_t mutex = _MTX_INITIALIZER_NP;
       static unsigned anon_count = 1;
-      identifier = ralloc_asprintf(this, "#anon_struct_%04x", anon_count);
-      anon_count++;
+      unsigned count;
+
+      mtx_lock(&mutex);
+      count = anon_count++;
+      mtx_unlock(&mutex);
+
+      identifier = ralloc_asprintf(this, "#anon_struct_%04x", count);
    }
    name = identifier;
    this->declarations.push_degenerate_list_at_head(&declarator_list->link);