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Updating the LF MPMC queue and replacing DirQueue with it

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Making the MPMC queue support when producers are consumers at the same
time by adding a variable work, mpmc_push_work() that increments work
and mpmc_task_done() that decrements work, and if work = 0 calls
mpmc_producers_finished() that pushes poinsons to wake up sleeping
threads and make them return NULL

Replacing DirQueue, a queue growable with realloc with the MPMC queue
This commit is contained in:
amir
2026-03-11 17:48:36 +01:00
parent 0e3ec5b09c
commit c1abada7ba
9 changed files with 980 additions and 162 deletions
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125
platform_windows.c
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@@ -1,4 +1,3 @@
#include "arena.h"
#include "platform.h"
// ----------------------------- Globals ------------------------------------
@@ -104,48 +103,6 @@ void platform_get_file_owner(const char *path, char *out_owner,
get_file_owner(path, out_owner, out_owner_size);
}
// --------------- parallel directory scanning ----------------
// Add queue helper functions
static void dirqueue_push(DirQueue *q, const char *path) {
EnterCriticalSection(&q->cs);
if (q->count + 1 > q->cap) {
q->cap = q->cap ? q->cap * 2 : 1024;
q->items = realloc(q->items, q->cap * sizeof(char *));
}
q->items[q->count++] = _strdup(path);
WakeConditionVariable(&q->cv);
LeaveCriticalSection(&q->cs);
}
static char *dirqueue_pop(DirQueue *q) {
EnterCriticalSection(&q->cs);
while (q->count == 0 && q->active > 0) {
SleepConditionVariableCS(&q->cv, &q->cs, INFINITE);
}
if (q->count == 0 && q->active == 0) {
LeaveCriticalSection(&q->cs);
return NULL; // truly done
}
char *dir = q->items[--q->count];
q->active++;
LeaveCriticalSection(&q->cs);
return dir;
}
static void dirqueue_done(DirQueue *q) {
EnterCriticalSection(&q->cs);
q->active--;
WakeAllConditionVariable(&q->cv);
LeaveCriticalSection(&q->cs);
}
// ----------------------------- Scan helpers -----------------------------
void scan_folder_windows_parallel(const char *base, ScannerContext *ctx) {
char search[MAX_PATHLEN];
@@ -167,7 +124,12 @@ void scan_folder_windows_parallel(const char *base, ScannerContext *ctx) {
continue;
if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
dirqueue_push(ctx->dir_queue, full);
size_t len = strlen(full) + 1;
char *dir = arena_push(&ctx->path_arena, len, false);
memcpy(dir, full, len);
mpmc_push_work(ctx->dir_queue, dir);
} else {
atomic_fetch_add(&g_files_found, 1);
@@ -192,7 +154,7 @@ void scan_folder_windows_parallel(const char *base, ScannerContext *ctx) {
fe->size_bytes = ((uint64_t)fd.nFileSizeHigh << 32) | fd.nFileSizeLow;
mpmc_push(&g_file_queue, fe);
mpmc_push(ctx->file_queue, fe);
}
} while (FindNextFileA(h, &fd));
@@ -203,19 +165,16 @@ void scan_folder_windows_parallel(const char *base, ScannerContext *ctx) {
// ------------------------- Scan worker --------------------------------
static DWORD WINAPI scan_worker(LPVOID arg) {
ScannerContext *ctx = arg;
DirQueue *q = ctx->dir_queue;
for (;;) {
char *dir = dirqueue_pop(q);
char *dir = mpmc_pop(ctx->dir_queue);
if (!dir)
break;
scan_folder_windows_parallel(dir, ctx);
free(dir);
dirqueue_done(q);
mpmc_task_done(ctx->dir_queue, ctx->num_threads);
}
return 0;
}
@@ -252,11 +211,10 @@ static void xxh3_hash_file_stream(const char *path, char *out_hex, BYTE *buf) {
static DWORD WINAPI hash_worker(LPVOID arg) {
WorkerContext *ctx = (WorkerContext *)arg;
mem_arena *local_arena = ctx->arena;
BYTE *buf = (BYTE *)malloc(READ_BLOCK);
for (;;) {
FileEntry *fe = mpmc_pop(&g_file_queue);
FileEntry *fe = mpmc_pop(ctx->file_queue);
if (!fe)
break;
@@ -275,12 +233,12 @@ static DWORD WINAPI hash_worker(LPVOID arg) {
snprintf(stack_buf, sizeof(stack_buf), "%s\t%s\t%.2f\t%s\t%s\t%s\n",
hash, fe->path, size_kib, created, modified, fe->owner);
char *dst = arena_push(&local_arena, len, false);
char *dst = arena_push(&ctx->arena, len, false);
memcpy(dst, stack_buf, len);
atomic_fetch_add(&g_files_hashed, 1);
}
free(buf);
// free(buf); It will be freed by the system when the program exits
return 0;
}
@@ -420,9 +378,7 @@ int main(int argc, char **argv) {
folder_count = 1;
}
// -------------------------------
// Display selected folders
// -------------------------------
printf("Processing %d folder(s):\n", folder_count);
for (int i = 0; i < folder_count; ++i) {
printf(" - %s\n", folders[i]);
@@ -472,20 +428,13 @@ int main(int argc, char **argv) {
size_t num_threads = hw_threads * 2;
// -------------------------------
// Step 1: Scan all folders
// Scanning and hashing
// -------------------------------
MPMCQueue dir_queue;
mpmc_init(&dir_queue, MiB(1));
mpmc_init(&g_file_queue, MiB(1));
DirQueue q;
memset(&q, 0, sizeof(q));
InitializeCriticalSection(&q.cs);
InitializeConditionVariable(&q.cv);
q.active = 0;
for (int i = 0; i < folder_count; ++i) {
dirqueue_push(&q, folders[i]);
}
MPMCQueue file_queue;
mpmc_init(&file_queue, MiB(1));
// starting hash threads
size_t num_hash_threads = num_threads;
@@ -498,6 +447,7 @@ int main(int argc, char **argv) {
for (size_t i = 0; i < num_hash_threads; ++i) {
workers[i].arena = arena_create(&params);
workers[i].file_queue = &file_queue;
hash_threads[i] = CreateThread(NULL, 0, hash_worker, &workers[i], 0, NULL);
}
@@ -514,26 +464,40 @@ int main(int argc, char **argv) {
arena_push(&gp_arena, sizeof(HANDLE) * num_scan_threads, true);
for (size_t i = 0; i < num_scan_threads; i++) {
scanners[i].dir_queue = &q;
scanners[i].num_threads = num_scan_threads;
scanners[i].path_arena = arena_create(&params);
scanners[i].meta_arena = arena_create(&params);
scanners[i].dir_queue = &dir_queue;
scanners[i].file_queue = &file_queue;
scan_threads[i] = CreateThread(NULL, 0, scan_worker, &scanners[i], 0, NULL);
}
WaitForMultipleObjects((DWORD)num_scan_threads, scan_threads, TRUE, INFINITE);
// Initial folder push
for (int i = 0; i < folder_count; i++) {
for (size_t i = 0; i < num_hash_threads; i++) {
mpmc_push(&g_file_queue, NULL);
size_t len = strlen(folders[i]) + 1;
char *path = arena_push(&scanners[0].path_arena, len, false);
memcpy(path, folders[i], len);
mpmc_push_work(&dir_queue, path);
}
atomic_store(&g_scan_done, 1);
// Stop scan threads
WaitForMultipleObjects((DWORD)num_scan_threads, scan_threads, TRUE, INFINITE);
for (size_t i = 0; i < num_scan_threads; ++i)
CloseHandle(scan_threads[i]);
for (size_t i = 0; i < num_hash_threads; i++) {
mpmc_push(&file_queue, NULL);
}
atomic_store(&g_scan_done, 1);
arena_free(&gp_arena, (u8 **)&scan_threads,
sizeof(HANDLE) * num_scan_threads);
@@ -544,13 +508,13 @@ int main(int argc, char **argv) {
printf("Completed scanning in %.2f seconds, found %zu files\n\n",
scan_seconds, total_found);
// if no files found
// If no files found
if (total_found == 0) {
printf("No files found.\n");
return 0;
}
// stop hashing threads
// Stop hashing threads
WaitForMultipleObjects((DWORD)num_hash_threads, hash_threads, TRUE, INFINITE);
for (size_t i = 0; i < num_hash_threads; ++i)
@@ -559,10 +523,13 @@ int main(int argc, char **argv) {
arena_free(&gp_arena, (u8 **)&hash_threads,
sizeof(HANDLE) * num_hash_threads);
// Stop progress printing thread
WaitForSingleObject(progress, INFINITE);
CloseHandle(progress);
// write file_hashes.txt
// -------------------------------
// Export file_hashes.txt
// -------------------------------
// FILE *f = fopen(FILE_HASHES_TXT, "wb");
//
@@ -591,7 +558,9 @@ int main(int argc, char **argv) {
WriteFile(h, arena_base, (DWORD)local_hash_arena->pos, &written, NULL);
}
// done time
// -------------------------------
// Print summary
// -------------------------------
double total_seconds = timer_stop(&total_timer);
printf("Completed hashing %zu files\n", total_found);