Fix lock-free queue bugs and add GitHub Actions CI

Co-authored-by: darkautism <3898040+darkautism@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -0,0 +1,17 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build
+        run: make
+      - name: Test
+        run: make test

.gitignore

@@ -8,3 +8,10 @@
 /Visual Stdio/.vs/lfqueue/v14
 /Visual Stdio/Release
 /Visual Stdio/Debug
+
+# Build artifacts
+bin/
+*.o
+*.a
+*.so
+*.so.*

_codeql_detected_source_root

@@ -0,0 +1 @@
+.

bin/example

@@ -52,7 +52,10 @@
 	#define lmb() asm volatile("":::"memory")   // compiler barrier only.  runtime reordering already impossible on x86
 	#define smb() asm volatile("":::"memory")
        // "mfence" for lmb and smb makes assertion failures rarer, but doesn't eliminate, so it's just papering over the symptoms
-#endif // else no definition
+#else
+	#define lmb() mb()
+	#define smb() mb()
+#endif
 
 	// thread
 	#include <pthread.h>

bin/test_p100c10

@@ -91,14 +91,16 @@ int lfq_init(struct lfq_ctx *ctx, int max_consume_thread) {
 		return -errno;
 
 	struct lfq_node * free_pool_node = calloc(1,sizeof(struct lfq_node));
-	if (!free_pool_node) 
+	if (!free_pool_node) {
+		free(tmpnode);
 		return -errno;
+	}
 
 	tmpnode->can_free = free_pool_node->can_free = true;
 	memset(ctx, 0, sizeof(struct lfq_ctx));
 	ctx->MAXHPSIZE = max_consume_thread;
-	ctx->HP = calloc(max_consume_thread,sizeof(struct lfq_node));
-	ctx->tid_map = calloc(max_consume_thread,sizeof(struct lfq_node));
+	ctx->HP = calloc(max_consume_thread,sizeof(struct lfq_node *));
+	ctx->tid_map = calloc(max_consume_thread,sizeof(int));
 	ctx->head = ctx->tail=tmpnode;
 	ctx->fph = ctx->fpt=free_pool_node;