From fe7f63632f5cd24bea65d1ef2de88ccbab9b8602 Mon Sep 17 00:00:00 2001
From: "qsr@chromium.org"
 <qsr@chromium.org@4c0a9323-5329-0410-9bdc-e9ce6186880e>
Date: Thu, 8 Mar 2012 18:47:26 +0000
Subject: [PATCH]  Remove static initializer in linux/guid_creator.cc.

 There was a static initializer generated for this file in Chrome for Android.

 Patch by pliard@chromium.org
 Original review: http://breakpad.appspot.com/359001/
Review URL: https://breakpad.appspot.com/359002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@931 4c0a9323-5329-0410-9bdc-e9ce6186880e
---
 src/common/linux/guid_creator.cc | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/src/common/linux/guid_creator.cc b/src/common/linux/guid_creator.cc
index 678f5904..426f93a1 100644
--- a/src/common/linux/guid_creator.cc
+++ b/src/common/linux/guid_creator.cc
@@ -30,6 +30,7 @@
 #include "common/linux/guid_creator.h"
 
 #include <assert.h>
+#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
@@ -45,10 +46,6 @@
 //
 class GUIDGenerator {
  public:
-  GUIDGenerator() {
-    srandom(time(NULL));
-  }
-
   static u_int32_t BytesToUInt32(const u_int8_t bytes[]) {
     return ((u_int32_t) bytes[0]
             | ((u_int32_t) bytes[1] << 8)
@@ -63,7 +60,8 @@ class GUIDGenerator {
     bytes[3] = (n >> 24) & 0xff;
   }
 
-  bool CreateGUID(GUID *guid) const {
+  static bool CreateGUID(GUID *guid) {
+    InitOnce();
     guid->data1 = random();
     guid->data2 = (u_int16_t)(random());
     guid->data3 = (u_int16_t)(random());
@@ -71,13 +69,23 @@ class GUIDGenerator {
     UInt32ToBytes(&guid->data4[4], random());
     return true;
   }
+
+ private:
+  static void InitOnce() {
+    pthread_once(&once_control, &InitOnceImpl);
+  }
+
+  static void InitOnceImpl() {
+    srandom(time(NULL));
+  }
+
+  static pthread_once_t once_control;
 };
 
-// Guid generator.
-const GUIDGenerator kGuidGenerator;
+pthread_once_t GUIDGenerator::once_control = PTHREAD_ONCE_INIT;
 
 bool CreateGUID(GUID *guid) {
-  return kGuidGenerator.CreateGUID(guid);
+  return GUIDGenerator::CreateGUID(guid);
 }
 
 // Parse guid to string.