randomx: serialize cache initialization (#4)

1 files changed, 5 insertions, 0 deletions

diff --git a/src/randomx_pow.cpp b/src/randomx_pow.cpp
index d617ba2..1d058d4 100644
--- a/src/randomx_pow.cpp
+++ b/src/randomx_pow.cpp
@@ -19,6 +19,7 @@ static randomx_cache*  g_cache   = NULL;
 static randomx_dataset* g_dataset = NULL;
 static randomx_vm*     g_vmVerify = NULL;
 static CCriticalSection g_csVerify;
+static std::mutex      g_csInit;
 static bool            g_fInit    = false;
 static bool            g_fFast    = false;
 
@@ -28,6 +29,10 @@ bool RandomXInit()
     if (g_fInit)
         return true;
 
+    std::lock_guard<std::mutex> lock(g_csInit);
+    if (g_fInit)
+        return true;
+
     // Detect the best flags for this CPU (JIT, hardware AES, Argon2).
     g_flags = randomx_get_flags();