From b9c426012770d166e6ebfab27689be44e6e89aa5 Mon Sep 17 00:00:00 2001
From: Anthony Towns <aj@erisian.com.au>
Date: Sun, 1 Mar 2020 14:22:37 +1000
Subject: sync.h: add REVERSE_LOCK

---
 src/sync.cpp | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'src/sync.cpp')

diff --git a/src/sync.cpp b/src/sync.cpp
index 924e7b5bb..71657a743 100644
--- a/src/sync.cpp
+++ b/src/sync.cpp
@@ -13,7 +13,7 @@
 #include <util/strencodings.h>
 #include <util/threadnames.h>
 
-
+#include <system_error>
 #include <map>
 #include <set>
 
@@ -60,6 +60,11 @@ struct CLockLocation {
             mutexName, sourceFile, itostr(sourceLine), (fTry ? " (TRY)" : ""), m_thread_name);
     }
 
+    std::string Name() const
+    {
+        return mutexName;
+    }
+
 private:
     bool fTry;
     std::string mutexName;
@@ -155,6 +160,18 @@ void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs
     push_lock(cs, CLockLocation(pszName, pszFile, nLine, fTry, util::ThreadGetInternalName()));
 }
 
+void CheckLastCritical(void* cs, std::string& lockname, const char* guardname, const char* file, int line)
+{
+    if (!g_lockstack.empty()) {
+        const auto& lastlock = g_lockstack.back();
+        if (lastlock.first == cs) {
+            lockname = lastlock.second.Name();
+            return;
+        }
+    }
+    throw std::system_error(EPERM, std::generic_category(), strprintf("%s:%s %s was not most recent critical section locked", file, line, guardname));
+}
+
 void LeaveCritical()
 {
     pop_lock();
-- 
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