[LyX/2.1.x] Make include and bibitem insets threadsafe

[Georg Baum]

commit f4ed3dc6b50f144ac79497008f6904ebcb39cfd4
Author: Georg Baum <b...@lyx.org>
Date:   Mon Jul 7 21:35:53 2014 +0200

    Make include and bibitem insets threadsafe
    
    Using a mutex to ensure that the generated filenames and ids are still 
unique.

diff --git a/src/insets/InsetBibitem.cpp b/src/insets/InsetBibitem.cpp
index 2840ad5..bf3929c 100644
--- a/src/insets/InsetBibitem.cpp
+++ b/src/insets/InsetBibitem.cpp
@@ -41,6 +41,7 @@
 #include "support/docstream.h"
 #include "support/gettext.h"
 #include "support/lstrings.h"
+#include "support/mutex.h"
 
 using namespace std;
 using namespace lyx::support;
@@ -49,6 +50,7 @@ namespace lyx {
 
 
 int InsetBibitem::key_counter = 0;
+static Mutex counter_mutex;
 docstring const key_prefix = from_ascii("key-");
 
 
@@ -56,8 +58,10 @@ InsetBibitem::InsetBibitem(Buffer * buf, InsetCommandParams 
const & p)
        : InsetCommand(buf, p)
 {
        buffer().invalidateBibinfoCache();
-       if (getParam("key").empty())
+       if (getParam("key").empty()) {
+               Mutex::Locker lock(&counter_mutex);
                setParam("key", key_prefix + convert<docstring>(++key_counter));
+       }
 }
 
 
@@ -197,6 +201,7 @@ void InsetBibitem::read(Lexer & lex)
 
        if (prefixIs(getParam("key"), key_prefix)) {
                int const key = 
convert<int>(getParam("key").substr(key_prefix.length()));
+               Mutex::Locker lock(&counter_mutex);
                key_counter = max(key_counter, key);
        }
 }
diff --git a/src/insets/InsetInclude.cpp b/src/insets/InsetInclude.cpp
index d531662..e3960c4 100644
--- a/src/insets/InsetInclude.cpp
+++ b/src/insets/InsetInclude.cpp
@@ -61,6 +61,7 @@
 #include "support/lassert.h"
 #include "support/lstrings.h" // contains
 #include "support/lyxalgo.h"
+#include "support/mutex.h"
 
 #include "support/bind.h"
 
@@ -77,6 +78,8 @@ namespace {
 docstring const uniqueID()
 {
        static unsigned int seed = 1000;
+       static Mutex mutex;
+       Mutex::Locker lock(&mutex);
        return "file" + convert<docstring>(++seed);
 }