Importer: Uses uv_cond to solve the puzzle.

Credit goes to @txdv.

src/binding.cpp

@@ -55,8 +55,7 @@ void dispatched_async_uv_callback(uv_async_t *req){
     ctx_w->imports[0] = sass_make_import_entry(ctx_w->file, 0, 0);
   }
 
-  //uv_mutex_unlock(ctx_w->mutex);
-  ctx_w->importer_mutex->unlock();
+  uv_cond_signal(&ctx_w->importer_condition_variable);
 
   if (try_catch.HasCaught()) {
     node::FatalException(try_catch);
@@ -67,20 +66,11 @@ struct Sass_Import** sass_importer(const char* file, void* cookie)
 {
   sass_context_wrapper* ctx_w = static_cast<sass_context_wrapper*>(cookie);
 
-  ctx_w->importer_mutex->lock();
-  //uv_mutex_lock(ctx_w->mutex);
-
-  // Enter critical section
   ctx_w->file = strdup(file);
   ctx_w->async.data = (void*)ctx_w;
   uv_async_send(&ctx_w->async);
 
-  // Reassurances
-  //uv_mutex_lock(ctx_w->mutex);
-  //uv_mutex_unlock(ctx_w->mutex);
-  Sleep(5);
-  ctx_w->importer_mutex->lock();
-  ctx_w->importer_mutex->unlock();
+  uv_cond_wait(&ctx_w->importer_condition_variable, &ctx_w->importer_mutex);
 
   return ctx_w->imports;
 }

libsass @ a94377b5

-Subproject commit 21688e1979bff089a13d9a44ad0608357b2a91cc
+Subproject commit a94377b5aac6a10a6aa3ed90656557e7b9843fd1

src/sass_context_wrapper.cpp

@@ -23,9 +23,9 @@ extern "C" {
   }
 
   sass_context_wrapper* sass_make_context_wrapper() {
-    // (sass_context_wrapper*) calloc(1, sizeof(sass_context_wrapper));
     auto ctx_w = (sass_context_wrapper*)calloc(1, sizeof(sass_context_wrapper));
-    ctx_w->importer_mutex = new std::mutex();
+    uv_mutex_init(&ctx_w->importer_mutex);
+    uv_cond_init(&ctx_w->importer_condition_variable);
     return ctx_w;
   }
 

src/sass_context_wrapper.h

-#include <mutex>
 #include <nan.h>
 #include "libsass/sass_context.h"
 
@@ -17,8 +16,8 @@ extern "C" {
     Sass_File_Context* fctx;
     Persistent<Object> stats;
     uv_work_t request;
-    std::mutex* importer_mutex;
-    //uv_mutex_t* mutex;
+    uv_mutex_t importer_mutex;
+    uv_cond_t importer_condition_variable;
     uv_async_t async;
     const char* file;
     void* cookie;