diff --git a/src/rpc/scgi.cc b/src/rpc/scgi.cc
index f992718ca..be2f4b5f3 100644
--- a/src/rpc/scgi.cc
+++ b/src/rpc/scgi.cc
@@ -170,10 +170,10 @@ SCgi::receive_call(SCgiTask* task, const char* buffer, uint32_t length) {
   slotWrite.set(rak::mem_fn(task, &SCgiTask::receive_write));
 
   torrent::thread_base::acquire_global_lock();
-  torrent::main_thread()->interrupt();
 
   bool result = xmlrpc.process(buffer, length, slotWrite);
 
+  torrent::main_thread()->interrupt();
   torrent::thread_base::release_global_lock();
 
   return result;
diff --git a/src/rpc/scgi_task.cc b/src/rpc/scgi_task.cc
index 9f2e32902..dc67563b3 100644
--- a/src/rpc/scgi_task.cc
+++ b/src/rpc/scgi_task.cc
@@ -226,6 +226,8 @@ SCgiTask::receive_write(const char* buffer, uint32_t length) {
   if (buffer == NULL || length > (100 << 20))
     throw torrent::internal_error("SCgiTask::receive_write(...) received bad input.");
 
+  torrent::thread_base::release_global_lock();
+
   // Need to cast due to a bug in MacOSX gcc-4.0.1.
   if (length + 256 > std::max(m_bufferSize, (unsigned int)default_buffer_size))
     realloc_buffer(length + 256, NULL, 0);
@@ -249,6 +251,9 @@ SCgiTask::receive_write(const char* buffer, uint32_t length) {
   lt_log_print_dump(torrent::LOG_RPC_DUMP, m_buffer, m_bufferSize, "scgi", "RPC write.", 0);
 
   event_write();
+
+  torrent::thread_base::acquire_global_lock();
+
   return true;
 }