From 8ff1b474bc2f1ed17fcb2cce2927a7bfb09e9c7e Mon Sep 17 00:00:00 2001
From: Takashi Kojo <kojo@wolfssl.com>
Date: Sun, 14 Jun 2020 07:12:13 +0900
Subject: [PATCH] Tentative: User defined mutex

---
 user-mutex.c                | 27 +++++++++++++++++++++++++++
 user_settings.h             |  2 ++
 wolfcrypt/src/wc_port.c     |  7 ++++++-
 wolfssl/wolfcrypt/wc_port.h |  8 ++++++--
 4 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 user-mutex.c
 create mode 100644 user_settings.h

diff --git a/user-mutex.c b/user-mutex.c
new file mode 100644
index 000000000..fca7da3cc
--- /dev/null
+++ b/user-mutex.c
@@ -0,0 +1,27 @@
+#include <wolfssl/wolfcrypt/wc_port.h>
+
+    int wc_InitMutex(wolfSSL_Mutex* m)
+    {
+        (void)m;
+        return 0;
+    }
+
+    int wc_FreeMutex(wolfSSL_Mutex *m)
+    {
+        (void)m;
+        return 0;
+    }
+
+
+    int wc_LockMutex(wolfSSL_Mutex *m)
+    {
+        (void)m;
+        return 0;
+    }
+
+
+    int wc_UnLockMutex(wolfSSL_Mutex *m)
+    {
+        (void)m;
+        return 0;
+    }
\ No newline at end of file
diff --git a/user_settings.h b/user_settings.h
new file mode 100644
index 000000000..23554d6e4
--- /dev/null
+++ b/user_settings.h
@@ -0,0 +1,2 @@
+
+typedef int wolfSSL_Mutex;
diff --git a/wolfcrypt/src/wc_port.c b/wolfcrypt/src/wc_port.c
index 087807b71..5b67c2633 100644
--- a/wolfcrypt/src/wc_port.c
+++ b/wolfcrypt/src/wc_port.c
@@ -647,7 +647,7 @@ int z_fs_close(XFILE file)
 
 #endif /* !NO_FILESYSTEM && !WOLFSSL_ZEPHYR */
 
-
+#if !defined(WOLFSSL_USER_MUTEX) 
 wolfSSL_Mutex* wc_InitAndAllocMutex(void)
 {
     wolfSSL_Mutex* m = (wolfSSL_Mutex*) XMALLOC(sizeof(wolfSSL_Mutex), NULL,
@@ -665,6 +665,7 @@ wolfSSL_Mutex* wc_InitAndAllocMutex(void)
 
     return m;
 }
+#endif
 
 #ifdef USE_WOLF_STRTOK
 /* String token (delim) search. If str is null use nextp. */
@@ -1845,6 +1846,10 @@ int wolfSSL_CryptHwMutexUnLock(void) {
         return 0;
     }
 
+#elif defined(WOLFSSL_USER_MUTEX)
+
+    /* Use user own mutex */
+
 #else
     #warning No mutex handling defined
 
diff --git a/wolfssl/wolfcrypt/wc_port.h b/wolfssl/wolfcrypt/wc_port.h
index 88c7bfe34..cf54e5de1 100644
--- a/wolfssl/wolfcrypt/wc_port.h
+++ b/wolfssl/wolfcrypt/wc_port.h
@@ -156,8 +156,10 @@
 
 #else
     #ifndef SINGLE_THREADED
-        #define WOLFSSL_PTHREADS
-        #include <pthread.h>
+        #ifndef  WOLFSSL_USER_MUTEX
+            #define WOLFSSL_PTHREADS
+            #include <pthread.h>
+        #endif
     #endif
     #if (defined(OPENSSL_EXTRA) || defined(GOAHEAD_WS)) && \
         !defined(NO_FILESYSTEM)
@@ -238,6 +240,8 @@
         typedef struct k_mutex wolfSSL_Mutex;
     #elif defined(WOLFSSL_TELIT_M2MB)
         typedef M2MB_OS_MTX_HANDLE wolfSSL_Mutex;
+    #elif defined(WOLFSSL_USER_MUTEX)
+        /* typedef User_Mutex wolfSSL_Mutex; */
     #else
         #error Need a mutex type in multithreaded mode
     #endif /* USE_WINDOWS_API */