Update to NSPR 4.9.5 Beta 2, part 2: actual changes.

mozilla/nsprpub/pr/src/md/windows/w95thred.c

Index: mozilla/nsprpub/pr/src/md/windows/w95thred.c
===================================================================
--- mozilla/nsprpub/pr/src/md/windows/w95thred.c	(revision 179237)
+++ mozilla/nsprpub/pr/src/md/windows/w95thred.c	(working copy)
@@ -168,7 +168,43 @@
     return;
 }
 
+const DWORD MS_VC_EXCEPTION = 0x406D1388;
+
+#pragma pack(push,8)
+typedef struct tagTHREADNAME_INFO
+{
+   DWORD dwType; // Must be 0x1000.
+   LPCSTR szName; // Pointer to name (in user addr space).
+   DWORD dwThreadID; // Thread ID (-1=caller thread).
+   DWORD dwFlags; // Reserved for future use, must be zero.
+} THREADNAME_INFO;
+#pragma pack(pop)
+
 void
+_PR_MD_SET_CURRENT_THREAD_NAME(const char *name)
+{
+#ifdef _MSC_VER
+   THREADNAME_INFO info;
+
+   if (!IsDebuggerPresent())
+      return;
+
+   info.dwType = 0x1000;
+   info.szName = (char*) name;
+   info.dwThreadID = -1;
+   info.dwFlags = 0;
+
+   __try {
+      RaiseException(MS_VC_EXCEPTION,
+                     0,
+                     sizeof(info) / sizeof(ULONG_PTR),
+                     (ULONG_PTR*)&info);
+   } __except(EXCEPTION_CONTINUE_EXECUTION) {
+   }
+#endif
+}
+
+void
 _PR_MD_CLEAN_THREAD(PRThread *thread)
 {
     BOOL rv;