Added experimental multi-thread input processing support.

This is disabled by default. It can be enabled by setting MULTITHREADED_INPUT to 1
in doxygen.h. Still has many data races, so don't use for anything other than development!

1 files changed, 14 insertions, 4 deletions

diff --git a/src/util.cpp b/src/util.cpp
index d198a5d..86435fa 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -22,6 +22,7 @@
 #include <cinttypes>
 #include <string.h>
 
+#include <mutex>
 
 #include "md5.h"
 
@@ -1664,15 +1665,16 @@ static CharAroundSpace g_charAroundSpace;
 // Note: this function is not reentrant due to the use of static buffer!
 QCString removeRedundantWhiteSpace(const QCString &s)
 {
-  static bool cliSupport = Config_getBool(CPP_CLI_SUPPORT);
-  static bool vhdl = Config_getBool(OPTIMIZE_OUTPUT_VHDL);
+  bool cliSupport = Config_getBool(CPP_CLI_SUPPORT);
+  bool vhdl = Config_getBool(OPTIMIZE_OUTPUT_VHDL);
 
   if (s.isEmpty() || vhdl) return s;
 
   // We use a static character array to
   // improve the performance of this function
-  static char *growBuf = 0;
-  static int growBufLen = 0;
+  // and thread_local is needed to make it multi-thread safe
+  static THREAD_LOCAL char *growBuf = 0;
+  static THREAD_LOCAL int growBufLen = 0;
   if ((int)s.length()*3>growBufLen) // For input character we produce at most 3 output characters,
   {
     growBufLen = s.length()*3;
@@ -4480,11 +4482,19 @@ struct FindFileCacheElem
 
 static QCache<FindFileCacheElem> g_findFileDefCache(5000);
 
+#if MULTITHREADED_INPUT
+static std::mutex g_findFileDefMutex;
+#endif
+
 FileDef *findFileDef(const FileNameLinkedMap *fnMap,const char *n,bool &ambig)
 {
   ambig=FALSE;
   if (n==0) return 0;
 
+#if MULTITHREADED_INPUT
+  std::unique_lock<std::mutex> lock(g_findFileDefMutex);
+#endif
+
   const int maxAddrSize = 20;
   char addr[maxAddrSize];
   qsnprintf(addr,maxAddrSize,"%p:",(void*)fnMap);