feat: add semaphore support and extend DuckDB tests for linked extensions

Signed-off-by: Gordon Smith <GordonJSmith@gmail.com>

Author: GordonSmith

packages/duckdb/src-cpp/stubs.c

@@ -20,6 +20,7 @@
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <time.h>
+#include <semaphore.h>
 #include <sys/utsname.h>
 #include <emscripten/console.h>
 #include <emscripten/version.h>
@@ -49,6 +50,14 @@
         return -ENOSYS;            \
     }
 
+weak int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout)
+{
+    (void)sem;
+    (void)abs_timeout;
+    // Single threaded WASM build: treat waits as immediately satisfied.
+    return 0;
+}
+
 // #define STRINGIFY(s) #s
 // #define STR(s) STRINGIFY(s)
 

packages/duckdb/tests/duckdb.spec.ts

@@ -447,6 +447,24 @@ describe("duckdb", () => {
         });
     });
 
+    describe("Extensions", () => {
+        it("prints linked extensions", () => {
+            const con = duckdb.connect();
+            const result = con.query(`
+SELECT extension_name, installed, description
+FROM duckdb_extensions();
+`)!;
+
+            expect(Number(result.columnCount())).toBeGreaterThan(0);
+            expect(Number(result.rowCount())).toBeGreaterThan(0);
+
+            // result.print();
+
+            result.delete();
+            con.delete();
+        });
+    });
+
     describe("Print output", () => {
         it("supports print method on QueryResult", () => {
             const con = duckdb.connect();

vcpkg-overlays/duckdb/extensions.patch

@@ -7,8 +7,7 @@
       "name": "duckdb",
       "default-features": false,
       "features": [
-        "json",
-        "core-functions"
+        "json"
       ]
     },
     {