Implementing simple MPMC queue

Rewrinting the pipeline and progress display

platform.h

@@ -26,14 +26,14 @@
 #include <unistd.h>
 #endif
 
-#define XXH_VECTOR XXH_AVX2 // not recommanded to compile with gcc see xxhash.h line 4082
-                            // Must compile with /arch:AVX2 in clang-cl or -mavx2 in clang/gcc
+#define XXH_VECTOR                                                             \
+  XXH_AVX2 // not recommanded to compile with gcc see xxhash.h line 4082
+           // Must compile with /arch:AVX2 in clang-cl or -mavx2 in clang/gcc
 #define XXH_INLINE_ALL
 #include "xxhash.c"
 #include "xxhash.h"
 
 // ----------------------------- Config -------------------------------------
-#define FILE_LIST_TXT "file_list.txt"
 #define FILE_HASHES_TXT "file_hashes.txt"
 #define HASH_STRLEN 33 // 128-bit hex (32 chars) + null
 #define MAX_PATHLEN 4096
@@ -95,17 +95,32 @@ static double timer_stop(HiResTimer *t) {
          (double)g_qpc_freq.QuadPart;
 }
 
-/* Scan folders */
-typedef struct EntryBuffer {
-  FileEntry *entries;
-  size_t count;
-  size_t capacity;
-} EntryBuffer;
+// ============================================================
+// Simple Mutex-Based MPMC Queue (FileEntry*)
+// ============================================================
 
+typedef struct {
+  FileEntry **items;
+
+  size_t capacity;
+  size_t head;
+  size_t tail;
+  size_t count;
+
+  int producers_active;
+
+  CRITICAL_SECTION cs;
+  CONDITION_VARIABLE not_empty;
+  CONDITION_VARIABLE not_full;
+
+} MPMCQueue;
+
+static MPMCQueue g_file_queue;
+
+/* Scan folders */
 typedef struct DirQueue DirQueue;
 
-void scan_folder_windows_parallel(const char *base, DirQueue *q,
-                                  EntryBuffer *buf);
+void scan_folder_windows_parallel(const char *base, DirQueue *q);
 void scan_folder_posix_parallel(const char *base, DirQueue *q);
 
 typedef struct DirJob {