X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fuuid.c;h=df1206e1c80a9af45745c5ef3edabe4f5c6ef003;hb=HEAD;hp=8b02bf556a5b80127084657984b0e69952f4472b;hpb=279c9e030818e039bb1c26be76e2cc1e8f6b13a6;p=sliver-openvswitch.git

diff --git a/lib/uuid.c b/lib/uuid.c
index 8b02bf556..df1206e1c 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks
+/* Copyright (c) 2008, 2009, 2010, 2011, 2013 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,7 @@
 
 #include "aes128.h"
 #include "entropy.h"
+#include "ovs-thread.h"
 #include "sha1.h"
 #include "timeval.h"
 #include "util.h"
@@ -49,11 +50,8 @@ static void do_init(void);
 void
 uuid_init(void)
 {
-    static bool inited;
-    if (!inited) {
-        do_init();
-        inited = true;
-    }
+    static pthread_once_t once = PTHREAD_ONCE_INIT;
+    pthread_once(&once, do_init);
 }
 
 /* Generates a new random UUID in 'uuid'.
@@ -83,15 +81,22 @@ uuid_init(void)
 void
 uuid_generate(struct uuid *uuid)
 {
+    static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
+    uint64_t copy[2];
+
     uuid_init();
 
-    /* Increment the counter. */
+    /* Copy out the counter's current value, then increment it. */
+    ovs_mutex_lock(&mutex);
+    copy[0] = counter[0];
+    copy[1] = counter[1];
     if (++counter[1] == 0) {
         counter[0]++;
     }
+    ovs_mutex_unlock(&mutex);
 
     /* AES output is exactly 16 bytes, so we encrypt directly into 'uuid'. */
-    aes128_encrypt(&key, counter, uuid);
+    aes128_encrypt(&key, copy, uuid);
 
     /* Set bits to indicate a random UUID.  See RFC 4122 section 4.4. */
     uuid->parts[2] &= ~0xc0000000;
@@ -200,6 +205,12 @@ error:
     return false;
 }
 
+static void
+sha1_update_int(struct sha1_ctx *sha1_ctx, uintmax_t x)
+{
+   sha1_update(sha1_ctx, &x, sizeof x);
+}
+
 static void
 do_init(void)
 {
@@ -207,25 +218,21 @@ do_init(void)
     struct sha1_ctx sha1_ctx;
     uint8_t random_seed[16];
     struct timeval now;
-    pid_t pid, ppid;
-    uid_t uid;
-    gid_t gid;
 
     /* Get seed data. */
     get_entropy_or_die(random_seed, sizeof random_seed);
     xgettimeofday(&now);
-    pid = getpid();
-    ppid = getppid();
-    uid = getuid();
-    gid = getgid();
 
     /* Convert seed into key. */
     sha1_init(&sha1_ctx);
     sha1_update(&sha1_ctx, random_seed, sizeof random_seed);
-    sha1_update(&sha1_ctx, &pid, sizeof pid);
-    sha1_update(&sha1_ctx, &ppid, sizeof ppid);
-    sha1_update(&sha1_ctx, &uid, sizeof uid);
-    sha1_update(&sha1_ctx, &gid, sizeof gid);
+    sha1_update(&sha1_ctx, &now, sizeof now);
+    sha1_update_int(&sha1_ctx, getpid());
+#ifndef _WIN32
+    sha1_update_int(&sha1_ctx, getppid());
+    sha1_update_int(&sha1_ctx, getuid());
+    sha1_update_int(&sha1_ctx, getgid());
+#endif
     sha1_final(&sha1_ctx, sha1);
 
     /* Generate key. */