Add a runtime check to static/dynamicAlloc functions to ensure that pthreads don't accidentally run wrong type of allocate() call.

src/runtime.js

@@ -50,6 +50,9 @@ var RuntimeGenerator = {
   // called, takes control of STATICTOP)
   staticAlloc: function(size) {
     if (ASSERTIONS) size = '(assert(!staticSealed),' + size + ')'; // static area must not be sealed
+#if USE_PTHREADS
+    if (typeof ENVIRONMENT_IS_PTHREAD !== 'undefined' && ENVIRONMENT_IS_PTHREAD) throw 'Runtime.staticAlloc is not available in pthreads!'; // This is because each worker has its own copy of STATICTOP, of which main thread is authoritative.
+#endif
     var ret = RuntimeGenerator.alloc(size, 'STATIC');
     return ret;
   },
@@ -57,6 +60,9 @@ var RuntimeGenerator = {
   // allocation on the top of memory, adjusted dynamically by sbrk
   dynamicAlloc: function(size) {
     if (ASSERTIONS) size = '(assert(DYNAMICTOP > 0),' + size + ')'; // dynamic area must be ready
+#if USE_PTHREADS
+    if (typeof ENVIRONMENT_IS_PTHREAD !== 'undefined' && ENVIRONMENT_IS_PTHREAD) throw 'Runtime.dynamicAlloc is not available in pthreads!'; // This is because each worker has its own copy of DYNAMICTOP, of which main thread is authoritative.
+#endif
     var ret = RuntimeGenerator.alloc(size, 'DYNAMIC');
     ret += '; if (DYNAMICTOP >= TOTAL_MEMORY) { var success = enlargeMemory(); if (!success) { DYNAMICTOP = ret; return 0; } }'
     return ret;