From 62cb49534558f562ec8792eec74ce892b3e3529c Mon Sep 17 00:00:00 2001
From: Alan Antonuk <aega@med.umich.edu>
Date: Tue, 29 May 2012 17:30:23 -0400
Subject: Adding pthread shim for Win32 ENABLE_THREAD_SAFETY

---
 librabbitmq/CMakeLists.txt  |  5 +++++
 librabbitmq/amqp-openssl.c  | 23 ++++++++++++++++++++++-
 librabbitmq/win32/threads.c | 37 +++++++++++++++++++++++++++++++++++++
 librabbitmq/win32/threads.h | 14 ++++++++++++++
 4 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 librabbitmq/win32/threads.c
 create mode 100644 librabbitmq/win32/threads.h

diff --git a/librabbitmq/CMakeLists.txt b/librabbitmq/CMakeLists.txt
index 0fb8026..49c37b9 100644
--- a/librabbitmq/CMakeLists.txt
+++ b/librabbitmq/CMakeLists.txt
@@ -100,6 +100,11 @@ if (ENABLE_SSL_SUPPORT)
 
   if (ENABLE_THREAD_SAFETY)
     add_definitions(-DENABLE_THREAD_SAFETY)
+    if (WIN32)
+      set(AMQP_SSL_SRCS ${AMQP_SSL_SRCS} win32/threads.h win32/threads.c)
+    else()
+      set(AMQP_SSL_SRCS ${AMQP_SSL_SRCS} unix/threads.h)
+    endif()
   endif()
 endif()
 
diff --git a/librabbitmq/amqp-openssl.c b/librabbitmq/amqp-openssl.c
index 965f6e1..35f908c 100644
--- a/librabbitmq/amqp-openssl.c
+++ b/librabbitmq/amqp-openssl.c
@@ -45,7 +45,12 @@ static amqp_boolean_t openssl_initialized = 0;
 static unsigned long amqp_ssl_threadid_callback(void);
 static void amqp_ssl_locking_callback(int mode, int n, const char *file, int line);
 
+#ifdef _WIN32
+static long win32_create_mutex = 0;
+static pthread_mutex_t openssl_init_mutex = NULL;
+#else
 static pthread_mutex_t openssl_init_mutex = PTHREAD_MUTEX_INITIALIZER;
+#endif
 static pthread_mutex_t *amqp_openssl_lockarray = NULL;
 #endif /* ENABLE_THREAD_SAFETY */
 
@@ -323,6 +328,22 @@ amqp_ssl_locking_callback(int mode, int n, const char *file, int line)
 static int
 initialize_openssl()
 {
+#ifdef _WIN32
+  /* No such thing as PTHREAD_INITIALIZE_MUTEX macro on Win32, so we use this */
+  if (NULL == openssl_init_mutex)
+  {
+    while (InterlockedExchange(&win32_create_mutex, 1) == 1) 
+      /* Loop, someone else is holding this lock */ ;
+
+    if (NULL == openssl_init_mutex)
+    {
+      if (pthread_mutex_init(&openssl_init_mutex, NULL))
+        return -1;
+    }
+    InterlockedExchange(&win32_create_mutex, 0);
+  }
+#endif /* _WIN32 */
+  
 #ifdef ENABLE_THREAD_SAFETY
   if (pthread_mutex_lock(&openssl_init_mutex))
     return -1;
@@ -339,7 +360,7 @@ initialize_openssl()
         pthread_mutex_unlock(&openssl_init_mutex);
         return -1;
       }
-      for (int i = 0; i < CRYPTO_num_locks(); ++i)
+      for (i = 0; i < CRYPTO_num_locks(); ++i)
       {
         if (pthread_mutex_init(&amqp_openssl_lockarray[i], NULL))
         {
diff --git a/librabbitmq/win32/threads.c b/librabbitmq/win32/threads.c
new file mode 100644
index 0000000..cf2e9ee
--- /dev/null
+++ b/librabbitmq/win32/threads.c
@@ -0,0 +1,37 @@
+#include "threads.h"
+
+DWORD
+pthread_self(void)
+{
+  return GetCurrentThreadId();
+}
+
+int
+pthread_mutex_init(pthread_mutex_t *mutex, void *attr)
+{
+  *mutex = malloc(sizeof(CRITICAL_SECTION));
+  if (!*mutex)
+    return 1;
+  InitializeCriticalSection(*mutex);
+  return 0;
+}
+
+int
+pthread_mutex_lock(pthread_mutex_t *mutex)
+{
+  if (!*mutex)
+    return 1;
+
+  EnterCriticalSection(*mutex);
+  return 0;
+}
+
+int
+pthread_mutex_unlock(pthread_mutex_t *mutex)
+{
+  if (!*mutex)
+    return 1;
+
+  LeaveCriticalSection(*mutex);
+  return 0;
+}
diff --git a/librabbitmq/win32/threads.h b/librabbitmq/win32/threads.h
new file mode 100644
index 0000000..7cf6ca5
--- /dev/null
+++ b/librabbitmq/win32/threads.h
@@ -0,0 +1,14 @@
+#ifndef AMQP_THREAD_H
+#define AMQP_THREAD_H
+
+#include <Windows.h>
+
+typedef CRITICAL_SECTION *pthread_mutex_t;
+typedef int pthread_once_t;
+
+DWORD pthread_self(void);
+
+int pthread_mutex_init(pthread_mutex_t *, void *attr);
+int pthread_mutex_lock(pthread_mutex_t *);
+int pthread_mutex_unlock(pthread_mutex_t *);
+#endif /* AMQP_THREAD_H */
-- 
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